DESC:TECHNICAL FIELD
[001] The present subject matter described herein, in general, relates toelectrical switching devicesand more particularly to breaking current and clearing fault currents in switchgears in any switching device or circuit breaker using arc quenching technologies.

BACKGROUND
[002] An electrical switching device may be defined as unit designed to make, carry and break electrical supply so as to protect the equipment connected in the electrical circuit from damage caused by overload, under-voltage or short circuit etc. Circuit breakers are well-known electrical switching devices used to provide automatic circuit interruptionwhen circuit fault conditions occur. The circuit breaker is a device used in order to make, carry and break rated current and to clear a fault current. In case of breakintegrated current or in case of a fault, the circuit breaker, used, is expected to break this current with minimal damage to itself so that the breaker can be used for further operations. Opening of live contacts of a circuit breaker results in the formation of an electrical arc between the contacts. The electrical arc erodes the contacts and therefore reduces the life of the circuit breaker. Hence the design of arcing chamber needs to be as effective as possible and arc chutes play an important role in it.
[003] When it becomes necessary to interrupt the circuit, the moveable contacts are moved away from the stationary contacts, thus removing the moveable contacts from physical contact with the stationary contacts and creating a space there between them. This result in the formation of an electrical arc at the time the contacts are separated.As long as this arc is sustained in between the contacts the current through the circuit breaker will not be interrupted finally as because arc is itself a conductive path of electricity. The electrical arcerodes the contacts and therefore reduces the life of the circuit breaker. For total interruption of current by a circuit breaker it is essential to quench the arc as quick as possible. Hence the design of arcing chamber needs to be as effective as possible and arc chutes play an important role in it.
[004] The technology used in switchgears for arc quenching makes use of an arc quenching chamber for lengthening and splitting of arc. The faster the arc is quenched the better is the electrical life of the breaker. An arc chute assembly is designed with specific intention for efficient and quick arc quenching. The arc chute assembly consists of stack of deion plates made up of magnetic material to attract, split-up and cool the arcs. The stack of deion plates is trapped in between two plates known as side plates made up of electrically insulating material. The function of deion plates is to split the arc in several series arcs of approximately equal length which will result in higher arc voltage and distinctly greater dielectric strength after current zero. Since the splitter plate or deion plate system interrupts current by cooling of arcs and splitting of arcs into a series of sub-arcs orsplit-arcs or arclets and by developing arc voltage greater than the system voltage, thus for reliable interruption of an electrical arc, the deion plates should allow and promote smooth and fast movement of arc into the deion plates and not allow or preventsmovement of arc either downward toward contact gap or upward toward the vent region above the deion plates and ensure quenching of the arc within the arc chute assembly itself.
[005] The prior art document, US 20140151340 A1discloses an arc chute arrangement for arc quenching in electrical switching device comprising deion plates having a chamfered profile at one corner to generate high magnetic field that drive the arc inside arc chute to provide faster quenching effect.
[006] The prior art document, US005898152 A discloses arc chute assembly for circuit breaker which includes a plurality of U-type grids.
[007] The prior art document EP2110831 A2 discloses arc chute assembly for a circuit breaker wherein the quenching portion includes at least two deion plates being spaced along the lateral axis of the housing and each having a cut portion wherein the cut portions are staggered along the lateral axis with respect to one another and are configured to mitigate an arc.
[008] The prior art document, EP2421015 A1 discloses circuit breaker and arc chute with shield apparatus that includes a number of plate-like shield members that have elongated openings formed therein to receive portions of arc plates there through.
[009] The disadvantage of the current technology or the technology till date is that the electrical arc quenching process is not efficient, development of arc voltage is less and sluggish, thus total arcing time is high. Due to this, the electrical life of the breaker reduces. Another disadvantage is that the standing arc above deion plates, due to which short circuit fault clearing capability is greatly reduced. Due to the disadvantages listed above, the short circuit breaking performances are much lower. The downward movement of the arc is also a problem and so the standing arc below deion plate region.
[0010] The current design and technology trend uses flat deion plates in the arc chute assembly with or without some profile cut on it. The shape, size, profile and thickness of the deion plate varies. Usually by splitting the arc between the deion plates arc voltage is developed. So the current technology trend greatly depends on the splitting of the arc between deion plates for effective arc quenching. The disadvantage of the current technology is that the arc quenching process is not efficient, development of arc voltage is less and sluggish, thus total arcing time is high. In this case also there lies a possibility of standing arc above deion plates, if the arc energy has not been decreased significantly, dielectric strength is not fully regained by arc chamber and development of arc voltage is not sufficient to quench the arc.Further, the downward movement of the arc is also a problem and so the standing arc below deion plate region.
[0011] Specifically, splitter plate or deion plate system interrupts current by cooling of arcs and splitting of arcs into a series of sub-arcs or split-arcs or arclets and by developing arc voltage greater than the system voltage. Thus for reliable interruption of an electrical arc, the deion plates should, allow and promote smooth and fast movement of arc into the deion plates for splitting of the arc and thus for successful quenching of the arc. The joining of split-arcs above the deion plate or in the vent region due to upward movement of unquenched arclets leads to flashover and downward movement of arc leads to sustained arc in the contact gap region, both of which are undesirable for efficient and successful breaking of rated or fault current.With or without profile cut, flat splitter plates with straight edges or with slightly bent notch or serrated edges, usually have shortcomings on either or both of the phenomena mentioned above along with high arcing time and comparatively inefficient arc quenching. Most prior and current flat plate designs of deion plates have limitations of unstable retention of arc in the arc chute assembly or deion plate region, due to the magnetic field and magnetic force produced in the flat deion plate region. In case of flat plate deion plates, the direction of force on the arc can be upward toward the vent area or downward toward the contact gap area and are depending upon current path and magnetic field in the deion plates. Rapid ejection of sub-arcs or arclets permits a reuniting of the sub-arcs into the vent space, or downward movement of sub-arcs or arclets permits a reuniting of sub-arcs in the contact gap region thus forming a single arc or a lesser number of arclets and thus standing arc or sustainable arc form or downward movement of unquenched arc leads to standing arc or sustainable arc in the contact gap region.
[0012] Thus, in view the hitherto drawbacks of the existing arc chute assembly with deion plates, there exists a dire need to provide an improved arrangement of deion plates used in arc chute of an electrical switching devices such as circuit breaker, a motor circuit breaker or contactor to improve arc quenching performance, reduce the risk of flashovers happening outside the breaker and also reduce the risk of standing arc or sustainable arc in the contact gap region below the deion plates and thereby improving the short circuit breaking performance.

SUMMARY OF THE INVENTION
[0013] The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
[0014] An object of the present invention is to provide an improved arc chute arrangement for arc quenching in electrical switching device that obviates the drawbacks of the existing arc chute assembly.
[0015] Another object of the present invention is to provide a hook shaped deion plates for higher arc voltage development.
[0016] Yet another object of the present invention is to provide faster arc quenching.
[0017] Accordingly, the present invention provides an arc chute assemblycomprising bentdeion plates which further comprises at least one of hook shaped bent deion plate and/or flat plate and/or long deion plates, said arc chute assembly provides faster arc quenching in an electrical switching device.
[0018] In one implementation, the present invention provides an arc chute arrangement in an electrical switching device wherein said arc chute arrangement comprising atleast one of bentdeion plates wherein each said bent deion plates is of a sharpbend with or without profile cut at the bent portion, said bent deion plates further comprises a shorter vertical portion of at least half the size of the longer vertical portion, said arc arrangement is used in said electrical switching device to improve the electrical arc quenching performance.
[0019] In one implementation, the present invention provides an arc chute arrangement in an electrical switching device wherein said arc chute arrangement comprising at least one of bentdeion plates wherein each said bent deion plates is of a sharper bend with or without profile cut at the bent portion, said bent deion plates further comprises the vertical portions of similar length, said arc arrangement is used in said electrical switching device to improve the electrical arc quenching performance.
[0020] In one implementation, the present invention provides atleast one of hook shaped deion plates, comprising a sharp bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion and/or vertical portions of similar length, said hook shaped deion plates incorporated in an arrangement in the arc chute assembly for developing high arc voltage than flat plate deion plates.
[0021] In one implementation, the present invention provides bent deion plate specially the hook shaped deion plate, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, in the arc chute assembly help to improve the electrical arc quenching performance in terms of greater arc voltage development, fast development of the arc voltage in the initial phase of splitting. Due to the unique profile and shape of the deion plates in the arc chute assembly, higher arc voltage develops due to lengthening of arc.
[0022] In one implementation, the bent deion plate may be of hook shaped, with comparatively sharper bend and with both the vertical portions having similar length, or can be of any other similar shaped or similar fashioned bent deion plate with a bend in the structure.
[0023] In one implementation, the hook shaped deion plate or plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, can also be used with or without single or multiple flat plate deion plates, single or multiple long deion plates and single or multiple hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other single or multiple similar shaped or similar fashioned bent deion plates, with or without any particular profile cut, in the arc chute assembly in any combination, in any arrangement and in any number to improve the arc quenching performance.
[0024] The hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, increases the force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. Then the formation of arc root and the lengthening of the arc along the bend portion help to set up such a current path, that in between the plates, arc path experiences higher force in the upward direction due to Lorentz force. This helps in fast arc movement and arc voltage development in comparison to the flat plate deion plate case thus reducing total arcing time. In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates, further elongation also can be possible in between the deion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
[0025] In similar manner, the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates increases the pull force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. Then the formation of arc root and the lengthening of the arc along the bend portion help to set up such a current path, that in between the plates, arc path experiences higher force in the upward direction due to Lorentz force. This helps in fast arc movement and arc voltage development in comparison to the flat plate deion plate case thus reducing total arcing time. Due to bent deion plates, further elongation can also be possible in between thedeion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
[0026] In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, the upward movement of the arc in between two flat limbs or vertical portions of the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, due to Lorentz force is fast, comparatively unrestricted and smooth thus reducing total arcing time.
[0027] As the chance of root formation on both side of the deion plate thickness are reduced in the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, the erosion of deion plates also reduces. The same is true for any hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates also.
[0028] Due to high and fast arc voltage development after arc enters into the deion plates, total arcing time reduces. It helps in better arc quenching. Thus reducing the chance of standing arc in above deion plate region due to lesser arc voltage development and improper quenching. In this regard, the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, helps in reducing the arc speed in the upward direction after the bend portion or notch of hook shape, instead it helps in further elongating the arc length due to Lorentz force between the arc root at the notch and the arc root on the nearby flat portion or between two notch portion of hook shaped deion plates in case of any different combinations of deion plate assembly in the arc chute assembly. So further development of arc voltage happens, which immensely help in proper quenching of the arc. The notch portion of the hook shaped deion plate, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, helps in retaining the arc in between the deion plate region. The Lorentz force and the notch portion help to prevent the downward and upward movement of the arc. So it reduces the chance of downward movement or upward movement of split arc-lets, thus reducing the chance of creating a standing arc in above the contact gap region and above deion plate region by joining of split arc lets.
[0029] The hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, ensure the retention of arc in the middle portion of the arc chute assembly vertically. This way, it prevents the upward and downward movement of arc in the arc chute assembly and ensures the interruption of the arc in the arc chute assembly itself. This avoids the accumulation of arc and related arc cloud and gases in the contact gap region, avoids occurrence of standing arc or sustained arc in the contact gap or in the venting area above deion plate. In this regard, as arc moves fast, after arc enters into the deion plates, in the arc chute assembly, the fast shifting of arc and related arc cloud or gas into the arc chute assembly from the bottom of the deion plates or from the nearby contact gap region, it helps in limited or reduced ionization of the medium in the bottom of the deion plates or in the nearby region of contact gap in the arcing chamber thus regaining dielectric strength after arcing can be fast and efficient in the said area. This reduces the chance of restrike of arc in the contact gap region and helps in better recovery after arc quenching.
[0030] Due to the unique and particular shape of the deion plates with profile cut in the bent portion of the deion plates, magnetic pull force on the arc increases, which helps in fast movement of the arc from the contact and runner area, thus reducing erosion of contact and reducing total arcing time.
[0031] The particular sharp bend profile and comparative aerodynamic shape of hook shaped deion plate helps in smooth arc movement into the deion plate region. This particular sharp bend profile and comparative aerodynamic shape of hook shaped deion plate also helps in comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates, in this case particularly hook shaped deion plate with profile cut at the bent portion helps greatly in comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates,and the notch profile of hook shaped deion plates without profile cut in the bent portion prevents the backward or downward movement of reflected shock wave, reflected gas and arc.
[0032] The particular shape of the current invention of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion and with both the vertical portions having similar length along with particular thickness also helps in withstanding the high electrodynamic force (Attraction and Repulsion) due to high current between the vertical portion of a single deion plate and between the deion plates. The hook shape of the deion plate and the robust assembly of deion plates in the side plates of arc chute assembly gives the required mechanical strength to withstand the high electrodynamic forces due to high current compared to other bent deion plate shape and arrangement. The profile cut on the unique hook shaped deion plate helps to move the arc in the upward direction due to magnetic force development and magnetic flux lines distribution.
[0033] Specifically, in comparison to the invention or the hook shaped deion plate, bent deion plates in absence of shorter limb or having comparatively large bend radius and with very small shorter vertical portion compared to the longer vertical portion or slightly bent notched flat deion plates or ‘J’ shaped deion plates seems to possess the limitations like 1) Retention of arc and related arc column and surrounding cloud at very near to the arcing contact or main contact region or contact gap region thus greater chance of restrike or sustained or standing arc in the contact gap region if sufficient dielectric strength has not been regained by the contact gap region and/or greater chance of downward movement of arc, 2) Insufficient or less arc voltage development just after arc enters into deion plates due to comparatively small arc lengthening along the bend of the deion plates in absence of parallel vertical portion or limbs or absence of shorter limbs after the bent portion compared to hook shaped deion plate with shorter vertical portion at least half the size of the longer vertical portion, here greater the arc path along the parallel limbs or parallel vertical portion and bent region of the deion plate, greater the lengthening of arc and thus greater the arc voltage developed, 3) Less force on arc in upward direction between the deion plates as current paths on the deion plate and magnetic field are not properly aligned to produce Lorentz force in the upward direction due to absence of parallel vertical portion or limbs or absence of shorter limbs after the bent portion compared to hook shaped deion plate with shorter vertical portion at least half the size of the longer vertical portion 4) Less penetration of arc path into the deion plates, thus less lengthening of arc, less arc voltage development 5) Less aerodynamic design effects as larger radius of the bent portion also hinders the smooth movement of arc column, surrounding arc cloud and gases in to the deion plate region from the contact gap region, as compared to hook shaped deion plate with shaper bend radius. 6) Hindering the movement of shock wave produced due to arc in upward direction toward the vent area due to larger radius of the bent portion and due to less aerodynamic design effect, the amount of reflected shock wave is greater compared to hook shaped deion plate with shaper bend radius.
[0034] Due to various unique features of this bent deion plate, this hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, can also be used in single or multiple numbers, with or without single or multiple flat plate deion plates, single or multiple long deion plates and single or multiple hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other single or multiple similar shaped or similar fashioned bent deion plates, with or without any particular profile cut, in the arc chute assembly in any combination, in any arrangement and in any number to improve the arc quenching performance.
[0035] In one implementation, the hook shaped deion plates, with comparatively sharper bend, with shorter vertical portion at least half the size of the longer vertical portion or with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates reduces the occurrence of conduction of current through the deion plate. Instead of the path through the metal deion plate, arc takes the path along the bend of the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates, thus elongating itself. This helps in developing high arc voltage than the normal flat plate deion plates. Therefore helps in efficient arc quenching.
[0036] Accordingly, in one implementation, an arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate is disclosed. The arc chute assembly is comprises at least one bended deion plate having comparatively sharper bend with a shorter vertical portion at least half a size of a longer vertical portion to achieve an arc voltage development.
[0037] In one implementation, an arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate is disclosed. The arc chute assembly comprises at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with at least two vertical portions having similar length to achieve an arc voltage development.
[0038] In one implementation,an arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate is disclosed. The arc chute assembly comprises at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with at least two vertical portions having similar length joined by a sharper bend to achieve an arc voltage development such that an arc takes the path along said sharper bend thereby elongating itself.
[0039] In one implementation, an arc chute assembly for arch quenching comprising at least one top cover coupled to at least one side plate is disclosed. The arc assembly is comprises at least one bended deion plate having comparatively sharper bend with a shorter vertical portion at least half a size of a longer vertical portion to achieve an arc voltage development, and at least one protrusion extending out to assemble said bended deion plate with said top cover and said side plate.
[0040] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:
[0041] Figure 1a illustratesan isometric view of a circuit breaker assembly, in accordance with an embodiment of the present subject matter.
[0042] Figure 1b illustrates a side view of breaker assembly (partial), showing arc chute assembly, contact assembly, in accordance with an embodiment of the present subject matter.
[0043] Figure 2a and Figure 2b illustrates a side view and isometric view of ‘Hook’ shaped deion plate, with comparatively sharper bend, with profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, in accordance with an embodiment of the present subject matter.
[0044] Figure 2c illustrates an isometric view of arc chute assembly (partial: 1 side plate is not shown) with ‘Hook’ shaped deion plates with profile cut on it, in accordance with an embodiment of the present subject matter.
[0045] Figure 2d and Figure 2e illustrates a side view and isometric view of ‘Hook’ shaped deion plate, with comparatively sharper bend, without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, in accordance with an embodiment of the present subject matter.
[0046] Figure 2f and 2g illustratesside view and isometric view of arc chute assembly (partial: 1 side plate is not shown) with ‘Hook’ shaped deion plates without profile cut on it, in accordance with an embodiment of the present subject matter.
[0047] Figure 3a and figure 3b illustrates a side and isometric view of arc chute assembly (partial: 1 side plate is not shown) with‘Hook’ shaped deion plates without any profile cut on it in the breaker assembly (partial) along with contact assembly, in accordance with an embodiment of the present subject matter.
[0048] Figure 3cillustrates a side view andfigure 3d and figure 3e illustrates an isometric view of arc chute assembly (partial: 1 side plate is not shown) with‘Hook’ shaped deion plates withoutprofile cut (Figure 3c, figure 3d) and withprofile cut (figure 3e) on italong with contact assembly, in accordance with an embodiment of the present subject matter.
[0049] Figure 4a, Figure 4b and Figure 4c illustrates different profile cut on the ‘Hook’ shaped deion plate, in accordance with an embodiment of the present subject matter.
[0050] Figure 4d illustrates a side view of inverted ‘Hook’ shaped deion plate, in accordance with an embodiment of the present subject matter.
[0051] Figure 4e and Figure 4f illustrates a side view and isometric view of hook shaped deion plates, with comparatively sharper bend, with profile cut at the bent portion and with both the vertical portions having similar length, in accordance with an embodiment of the present subject matter.
[0052] Figure 4g and Figure 4h illustrates a side view and isometric view of hook shaped deion plates, with comparatively sharper bend, without any profile cut on it at the bent portion and with both the vertical portions having similar length, in accordance with an embodiment of the present subject matter.
[0053] Figure 4i and Figure 4j illustrates a side view and isometric view of flat plate deion plate, in accordance with an embodiment of the present subject matter.
[0054] Figure 5a, 5b, 5c, 5d, 5e and 5f shows isometric views of different arc chute assemblies with (partial: 1 side plate is not shown) ‘Hook’ shaped deion plates, with comparatively sharper bend, with shorter vertical portion at least half the size of the longer vertical portion and with both the vertical portions having similar length, having different profile cut at the bent portion and arrangement, in accordance with an embodiment of the present subject matter.
[0055] Figure 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k, 6l shows the isometric views of some of the possible arc chute assemblies (partial: 1 side plate is not shown) consist of single or multiple ‘Hook’ shaped deion plate with or without particular profile cut, with shorter vertical portion at least half the size of the longer vertical portion and with both the vertical portions having similar length, with or without different profile cut at the bent portion of the deion plate and with different arrangements, flat plate deion plate, inverted ‘Hook’ shaped deion plate with or without particular profile cut, with shorter vertical portion at least half the size of the longer vertical portion and with or without different profile cut at the bent portion of the deion plate and with different arrangements, long deion plate, in some of the possible combination, arrangement and in number, in accordance with an embodiment of the present subject matter.
[0056] Figure 7a, 7b and 7c shows the Lorentz force on the arc and lengthening of arc (and also retention of arc) in between two Hook shaped deion plate due to the particular current path because of the unique shape and profile of the Hook shaped deion plates, with comparatively sharper bend and with shorter vertical portion at least half the size of the longer vertical portion, in accordance with an embodiment of the present subject matter.
[0057] Figure 8a shows the direction of Lorentz force on the arc in case of ‘Hook’ shaped deion plates, with comparatively sharper bend, with shorter vertical portion at least half the size, and figure 8b shows the direction of Lorentz force in case of flat deion plates, in accordance with an embodiment of the present subject matter.
[0058] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
[0059] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary.
[0060] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
[0061] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
[0062] It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
[0063] By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
[0064] Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
[0065] It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
[0066] This particular hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, reduces the occurrence of conduction of current through the deion plate., In this case arc takes the path along the bend of the hook shaped deion plates, with comparatively sharper bend, with profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, thus elongating itself. This helps in developing high arc voltage than the normal flat plate deion plates. Therefore helps in efficient arc quenching.
[0067] In one implementation, the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, has two limbs or vertical portions, one long vertical portion and another short vertical portion. Both limbs are joined by the bent portion in between and forms the shape of a hook with two vertical portions or limbs in parallel position, with a comparatively sharper bend compared to hook shape. This deion plate is developed from single metal sheet by bending. Between the flat portions of the two limbs of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, appropriate distance or air gap is there. The bending sharpness, bending radius, bending profile, length of the bending portion, distance between two limbs, air gap between two limbs, length of the flat portion of the two limbs of the hook shape deion plate, with a comparatively sharper bend compared to hook shape, can vary as per breaking capacity, voltage and current rating of the device and requirement. Any combination of these parameters can be adapted to form the bent deion plate, especially the hook shaped deion plates, as per requirement. Other than bending other processes like welding, extrusion, machining also can be used to achieve such similar shaped design with single or multiple metal sheets.
[0068] In one implementation, any similar shaped or similar fashioned bent deion plate can be formed. The bending sharpness, bending radius, bending profile, length of the bending portion, distance between two limbs, air gap between two limbs, length of the flat portion of the two limbs can vary as per requirement of the bent deion plate and can form any similar fashioned probable shape and size.
[0069] In one implementation, these deion plates can be assembled between side plates in the arc chute assembly. Any other effective arrangement of assembly to incorporate the deion plate assembly also can be possible.
[0070] In one implementation, these hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, are of suitable thickness to generate the pull force on the arc and to withstand the arc energy and attraction or repulsion force due to high current. The height, width and distance between the two vertical portion or limb of the deion plates can be selected suitably also as per the requirement. The hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, can be developed from mild steel or other suitable ferromagnetic metal. The hook shape can be achieved by bending the metal plate with appropriate accuracy. The deion plates can be zinc plated or any suitable material plating can be done. The number of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, can vary as per breaking capacity requirement. Multiple hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, can be used along with flat deion plates and long deion plates, hook shaped or inverted hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates.
[0071] Referring now to figure 2a, 2b and 2c, in one implementation, the hook shaped deion plates, with a sharp bend further comprising profile cut at the bent portion and withshorter vertical portion at least half the size of the longer vertical portion thereby arc takes the path along the bend of the hook shape, thus elongating itself which helps in developing more arc voltage than the normal flat plate deion plates.
[0072] Referring now to figure 4e and figure 4f, in one implementation, a hook shaped deion plates, with sharp bend further comprising profile cut at the bent portion and with both the vertical portions having similar length and/or any other shape of similar shaped thereby arc takes the path along the bend of the hook shape, thus elongating itself. This helps in developing more arc voltage than the normal flat plate deion plates.
[0073] In one implementation, an electrical switching device comprises said hook shaped deion plates is incorporated in an arc chute assembly. In one example, said electrical switching device is a circuit breaker.
[0074] In one implementation, said hook shaped deion plates, with a sharp bend, further comprising a profile cut at the bent portion or without the profile cut, shorter vertical portion at least half the size of the longer vertical portion, incorporated in a arc chute assembly, ensure the retention of arc in the middle portion of said arc chute assembly vertically preventing an upward and downward movement of arc in the arc chute assemblyand thereby ensuring interruption of the arc in said arc chute assembly itself. This avoids the accumulation of arc and related arccloud and gases in the contact gap region or fast exit of arc cloud and gases in the venting are above deion plates avoiding occurrence of standing arc and/or sustained arc in the contact gap or in theventing area above deion plates.
[0075] In one implementation, said hook shaped deion plates, with sharp bend further comprising a profile cut at the bent portion or without the profile cut, with shorter vertical portion at least half the size of the longer vertical portion increasing the pull force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. Then the formation of arc root and the lengthening of the arc along the bend portion help to set up a current path, that in between the plates, arc path experiences higher force in the upward direction due to Lorentz force (F) that helps in fast arc movement and arc voltage development after the arc enters into the deion plates in comparison to the flat plate deion plate case thus reducing total arcing time. In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion or any other similar shaped or similar fashioned bent deion plates, further elongation also can be possible in between the deion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
[0076] In one implementation, said hook shaped deion plates with sharp bend further comprising a profile cut at the bent portion or without the profile cut, both the vertical portions having similar length, or any other similar shape increasing a pull force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. The formation of arc root and the lengthening of the arc along the bend portion help to set up a current path, that in between the plates, arc path experiences higher force in the upward direction due to a Lorentz force (F). This helps in fast arc movement and arc voltage development after the arc enters into the deion plates in comparison to the flat plate deion plate case thus reducing total arcing time. In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length or any other similar shaped or similar fashioned bent deion plates, further elongation also can be possible in between the deion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
[0077] Referring now to figure 7a, 7b, 7c, 8a and 8b, said Lorentz force (F) on the arc and lengthening of arc in between at least two of hook shaped deion plateswith comparatively sharper bend, with shorter vertical portion at least half the size of a longer vertical portion, and in betweenat least two of flat deion plates where in case of flat deion plate said Lorentz force on the arc is upward or downward, depending upon the current path on the deion plates but for hook shaped deion plate the force on arc is in the upward direction thus reducing the chance of creating a standing arc above the contact region by joining of split arc lets and reducing the chance of downward movement of arc.
[0078] Persons skilled in the art will appreciate and understand the effect and direction of the Lorentz force on the arc and lengthening of arc, in between two deion plates, one of which a hook shaped deion plate with comparatively sharper bend and with shorter vertical portion at least half the size of the longer vertical portion, and the other can be a flat deion plate or inverted hook deion plate or hook shaped deion plate with comparatively sharper bend and with both the vertical portion having similar length, or in between two hook shaped deion plates, with comparatively sharper bend and with both the vertical portion having similar length, or in between two deion plates, one of which an inverted hook shaped deion plate with comparatively sharper bend and with shorter vertical portion at least half the size of the longer vertical portion, and the other can be a flat deion plate or hook shaped deion plate or hook shaped deion plate with comparatively sharper bend and with both the vertical portion having similar length, due to the particular current path because of the unique shape and profile of the Hook shaped deion plates, with comparatively sharper bend and with shorter vertical portion at least half the size of the longer vertical portion or hook shaped deion plate with comparatively sharper bend and with both the vertical portion having similar length, in accordance with an embodiment of the present subject matter.
[0079] In one implementation, an arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly comprises at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with shorter vertical portion at least half the size of a longer vertical portion joined by a sharper bend to achieve:
· Comparatively fast and greater arc voltage development after arc enters into arc chute assembly
· Reduction in total arcing time
· Comparatively fast and smooth movement of arc into the deion plates
· Retention and quenching of arc in the arc chute assembly
· Reduction in the chance of downward movement or upward movement of split arc-lets, thus reducing the chance of creating a standing arc in above the contact gap region and above deion plate region by joining of split arc lets
· Upward direction of Lorentz force on arc in between two adjacent hook shaped deion plates or in between one hook shaped and adjacent any deion plate in the arc chute assembly
· Further elongation of the arc length due to Lorentz force between the arc root at the notch and the arc root on the nearby flat portion or between two notch portion of hook shaped deion plates in case of any different combinations of deion plate assembly in the arc chute assembly
· Limited or reduced ionization of the medium in the bottom of the deion plates or in the nearby region of contact gap in the arcing chamber thus regaining dielectric strength after arcing can be fast and efficient in the said area thus reducing the chance of restrike of arc in the contact gap region and helps in better recovery after arc quenching
· Comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates and
· Reduced backward or downward movement of reflected shock wave, reflected gas and arc.
[0080] In one implementation, the arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly comprises at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with at least two vertical portions having similar length joined by a sharper bend to achieve:
· Comparatively fast and greater arc voltage development after arc enters into arc chute assembly
· Reduction in total arcing time
· Comparatively fast and smooth movement of arc into the deion plates
· Quenching of arc in the arc chute assembly
· Reduction in the chance of downward movement of split arc-lets, thus reducing the chance of creating a standing arc in above the contact gap region by joining of split arc lets
· Upward direction of Lorentz force on arc in between two adjacent hook shaped deion plates or in between one hook shaped and adjacent any deion plate in the arc chute assembly
· Further elongation of the arc length due to Lorentz force between the arc roots at the nearby flat portion of the two adjacent deion plate in the arc chute assembly or between the arc roots at flat portion and any notch portion of adjacent hook shaped deion plate in the arc chute assembly
· Limited or reduced ionization of the medium in the bottom of the deion plates or in the nearby region of contact gap in the arcing chamber thus regaining dielectric strength after arcing can be fast and efficient in the said area thus reducing the chance of restrike of arc in the contact gap region and helps in better recovery after arc quenching
· Comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates.
[0081] Apart from what is disclosed above the advantages and some of the important features of the present invention, considered to be noteworthy are mentioned below:
1. Usage of bent deion plates or bend structured deion plates in single or in multiple number and in any arrangement in the arc chute assembly.
2. Usage of the hook shaped deion plate or plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion in single or in multiple number and in any arrangement in the arc chute assembly.
3. Usage of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length in single or in multiple number in any arrangement in the arc chuteassembly.
4. The hook shaped deion plates, with comparatively sharper bend, withor without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, has two limbs or vertical portions, one long vertical portion and another short vertical portion. Both limbs are joined by the bent portion in between and forms the shape of a hook with two vertical portions or limbs in parallel position, with a comparatively sharper bend compared to hook shape. This deion plate is developed from single metal sheet by bending. Between the flat portions of the two limbs of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, appropriate distance or air gap is there. The bending sharpness, bending radius, bending profile, length of the bending portion, distance between two limbs, air gap between two limbs, length of the flat portion of the two limbs of the hook shape deion plate, with a comparatively sharper bend compared to hook shape, can vary as per breaking capacity, voltage and current rating of the device and requirement. Any combination of these parameters can be adapted to form the bent deion plate, especially the hook shaped deion plates, as per requirement. Other than bending other processes like welding, extrusion, machining also can be used to achieve such similarshaped design with single or multiple metal sheets.
5. In similar fashion hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, can also be formed. In that case the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length can have two flat limbs of similar length. Both limbs are joined by the bent portion in between and forms the shape of hook with two vertical portions or limbs in parallel position, with a comparatively sharper bend compared to hook shape. This deion plate is developed from single metal sheet by bending. Between the flat portions of the two limbs of hook shaped deion plates, with comparatively sharper bend, with profile cut at the bent portion and with both the vertical portions having similar length, appropriate distance or air gap is there. The bending sharpness, bending radius, bending profile, length of the bending portion, distance between two limbs, air gap between two limbs, length of the flat portion of the two limbs of the hook shaped deion plates, with comparatively sharper bend, with profile cut at the bent portion and with both the vertical portions having similar length, can vary as per breaking capacity, voltage and current rating of the device and requirement. Any combination of these parameters can be adopted to form the bent deion plate, especially the hook shape deion plate, as per requirement. Other than bending other processes like welding, extrusion, machining also can be used to achievesuch similar shaped design with single or multiple metal sheets.
6. In similar manner, any similar shaped or similar fashioned bent deion plate can be formed. The bending sharpness, bending radius, bending profile, length of the bending portion, distance between two limbs, air gap between two limbs, length of the flat portion of the two limbs of the bent deion plate can vary as per requirement and can form any similar fashioned probable shape and size.
7. Usage of the invention i.e. the hook shaped deion plate or plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, can also be used with or without single or multiple flat plate deion plates, single or multiple long deion plates and single or multiple hook shaped or inverted hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bentportion and with both the vertical portions having similar length, or any other single or multiple similar shaped or similar fashioned bent deion plates, with or without any particular profile cut, in the arc chute assembly in any combination, in anyarrangement and in any number to improve the electrical arc quenching performance.
8. Due to the unique profile and shape of the bent deion plates, especially hook shaped deion plate or plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, in the arc chute assembly, higher arc voltage develops due to lengthening of arc. In similar manner due to unique profile and shape of the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similarfashioned bent shaped deion plate in the arc chute assembly, higher arc voltage develops due to lengthening of arc.
9. This particular hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, reduces the occurrence of conduction of current through the deion plate. Here arc takes the path along the bend of the hook shape, thus elongating itself. This helps in developing high arc voltage thanthe normal flat plate deion plates. Therefore helps in efficient arc quenching.
10. In the same manner, the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other similar shaped or similar fashioned bent deion plates reduces the occurrence of conduction of current through the deion plate. Here arc takes the path along the bend of the hook shape, or any other similar shaped or similar fashioned bent deion plates, thus elongating itself. This helps in developing high arc voltage than the normal flat plate deion plates. Therefore helps inefficient arc quenching.
11. In one implementation, said hook shaped deion plates, with sharp bend further comprising a profile cut at the bent portion or without the profile cut, with shorter vertical portion at least half the size of the longer vertical portion increasing the pull force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. Then the formation of arc root and the lengthening of the arc along the bend portion help to set up a current path, that in between the plates, arc path experiences higher force in the upward direction due to Lorentz force (F) that helps in fast arc movement and arc voltage development after the arc enters into the deion plates in comparison to the flat plate deion plate case thus reducing total arcing time. In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion or any other similar shaped or similar fashioned bent deion plates, further elongation also can be possible in between the deion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
12. In one implementation, said hook shaped deion plates with sharp bend further comprising a profile cut at the bent portion or without the profile cut, both the vertical portions having similar length, or any other similar shape increasing a pull force on arc after the arc enters into the deion plates. After entering into the splitter plates, arc takes the path along the bent portion of the hook shaped deion plates and lengthening of arc happens and thus arc voltage developed due to lengthening of arc before splitting of arc happens. The formation of arc root and the lengthening of the arc along the bend portion help to set up a current path, that in between the plates, arc path experiences higher force in the upward direction due to Lorentz force (F). This helps in fast arc movement and arc voltage development after the arc enters into the deion plates in comparison to the flat plate deion plate case thus reducing total arcing time. In case of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length or any other similar shaped or similar fashioned bent deion plates, further elongation also can be possible in between the deion plate region due to Lorentz force and thus further development of arc voltage by lengthening of arc.
13. In this regard, as arc moves fast, after arc enters into the deion plates, in the arc chute assembly, the fast shifting of arc and related arc cloud or gas into the arc chute assembly from the bottom of the deion plates or from the nearby contact gap region, it helps in limited or reduced ionization of the medium in the bottom of the deion plates or in the nearby region of contact gap in the arcing chamber thus regaining dielectric strength after arcing can be fast and efficient in the said area. This reduces the chance of restrike of arc in the contact gap region and helps in better recovery after arc quenching.
14. Due to high and fast arc voltage development after arc enters into the deion plates, total arcing time reduces. It helps in better arc quenching. Thus reducing the chance of standing arc in above deion plate region due to lesser arc voltage development and improper quenching. In this regard, the hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, helps in reducing the arc speed in the upward direction after the bend portion or notch of hook shape, instead it helps in further elongating the arc length due to Lorentz force between the arc root at the notch and the arc root on the nearby flat portion or between two notch portion of hook shaped deion plates in case of any different combinations of deion plate assembly in the arc chute assembly. So further development of arc voltage happens, which immensely help in proper quenching of the arc. The notch portion of the hook shaped deion plate, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, helps in retaining the arc in between the deion plate region. The Lorentz force and the notch portion help to prevent the downward and upward movement of the arc. So it reduces the chance of downward movement or upward movement of split arc-lets, thus reducing the chance of creating a standing arc in above the contact gap region and above deion plate region by joining of split arc lets.
15. The hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, ensure the retention of arc in the middle portion of the arc chute assembly vertically. This way, it prevents the upward and downward movement of arc in the arc chute assembly and ensures the interruption of the arc in the arc chute assembly itself. This avoids the accumulation of arc and related arc cloud and gases in the contact gap region, avoids occurrence of standing arc or sustained arc in the contact gap or in theventing area above deion plate.
16. Due to high and fast arc voltage development after arc enters into the deion plates, total arcing time reduces. It helps in better arc quenching. Thus reducing the chance of standing arc in above deion plate region due to improper quenching because of lesser arc voltage development
17. The particular sharp bend profile and comparative aerodynamic shape of hook shaped deion plate helps in smooth arc movement into the deion plate region. This particular sharp bend profile and comparative aerodynamic shape of hook shaped deion plate also helps in comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates, in this case particularly hook shaped deion plate with profile cut at the bent portion helps greatly in comparatively smooth shockwave movement and generated gas movement in the upward direction, reduced reflected shockwave and gas from bottom of the deion plates,and the notch profile of hook shaped deion plates without profile cut in the bent portion prevents the backward or downward movement of reflected shock wave, reflected gas and arc.
18. Due to the unique and particular shape of the deion plates with profile cut in the bent portion of the deion plates of the deion plates, magnetic pull force on the arc increases, which helps in fast movement of the arc from the contact and runner area, thus reducing erosion of contact and reducing total arcing time.
19. The particular shape of the current invention of hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion and with both the vertical portions having similar length along with particular thickness also helps in withstanding the high electrodynamic force (Attraction and Repulsion) due to high current between the vertical portion of a single deion plate and between the deion plates. The hook shape of the deion plate and the robust assembly of deion plates in the side plates of arc chute assembly gives the required mechanical strength to withstand the high electrodynamic forces due to high current compared to other bent deion plate shape and arrangement. The profile cut on the unique hook shaped deion platehelps to move the arc in the upward direction due to magnetic force development and magnetic flux lines distribution.
20. Due to various unique features of these bent deion plates of this hook shaped or inverted hook shaped deion plate or plates, with comparatively sharper bend, with or without profile cut at the bent portion and with shorter vertical portion at least half the size of the longer vertical portion, which helps in higher arc voltage development, can also be used with or without single or multiple flat plate deion plates, single or multiple long deion plates and single or multiple hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion and with both the vertical portions having similar length, or any other single or multiple similar shaped or similar fashioned bent deion plates, with or without any particular profile cut, in the arc chute assembly in any combination, in any arrangement and in any number to improve the arc quenching performance, breakingcapacity, quality and efficiency of arc quenching, enhance breaking performance as per requirement.
21. The hook shape of the deion plate and the robust assembly of deion plates in the side plates of arc chute assembly gives the required mechanical strength to withstand the high electrodynamics forces due to high current compared to and other bent deion plate shape and arrangement.
22. The hook shaped deion plates, with comparatively sharper bend, with or without profile cut at the bent portion helps in developing high arc voltage than the normal flat plate deion plates due to lengthening of arc thus helping in efficient arc quenching.
23. Due to the unique and particular shape of the deion plates with or without profile cut in the bent portion of the deion plates, magnetic pull force on the arc increases, which helps in fast movement of the arc from the contact and runner area, thus reducing the erosion of contact and reducing total arcing time.
24. Due to high and fast arc voltage development after arc enters into the deion plates, total arcing time reduces. It helps in retention of arc within arc chute assembly and quenching of arc within the same. Thus reducing the chance of standing arc in above deion plate region due to improper quenching because of lesser arc voltage development.
,CLAIMS:1. An arc chute assembly for arcquenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly is CHARACTERIZED IN THAT comprising at least one bended deion plate,preferably hook shaped,having comparatively sharper bend with a shorter vertical portion at least half a size of a longer vertical portion to achieve an arc voltage development.

2. The arc chute assembly as claimed in claim 1, wherein said bended deion plate is preferably of hook shaped.

3. The arc chute assembly as claimed in claim 1, wherein said bended deion plate is preferably of hook shaped, with symmetrical or unsymmetrical profile cut at the bended portion along with respect to x, y and z axis.

4. The arc chute assembly as claimed in claim 1, wherein said bended deion plate is positioned, preferably, vertically above at least one contact assembly in said arc chute assembly.

5. The arc chute assembly as claimed in claim 1, wherein said bended deion plate comprises at least two limbs or vertical portions, one long vertical portion and another short vertical portion.

6. The arc chute assembly as claimed in claim 5, wherein said limbs are joined by a bended portion in between to form preferably a hook shape with two vertical portions or limbs in parallel position, with a comparatively sharper bend compared to hook shape.

7. The arc chute assembly as claimed in claim 6, wherein said vertical portions or limbs, preferably flat portions, are separated by an appropriate distance or air gap for arc quenching.

8. The arc chute assembly as claimed in claim 1, wherein said bended deion plate is developed from single or multiple metal sheet(s) preferably by bending.

9. An arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly is CHARACTERIZED IN THAT comprising at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with at least two vertical portions having similar length to achieve an arc voltage development.

10. An arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly is CHARACTERIZED IN THAT comprising at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with a shorter vertical portion at least half a size of a longer vertical portion joined by a sharper bend to achieve an arc voltage development such that an arc takes the path along said sharper bend thereby elongating itself.

11. An arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, wherein said arc chute assembly is CHARACTERIZED IN THAT comprising at least one bended deion plate, preferably hook shaped, having comparatively sharper bend with at least two vertical portions having similar length joined by a sharper bend to achieve an arc voltage development such that an arc takes the path along said sharper bend thereby elongating itself.

12. The arc chute assembly as claimed in claims 9 and 10, wherein said bended deion plate is preferably of hook shaped, with symmetrical or unsymmetrical profile cut at the bended portion to increases force on arc after said arc enters into the deion plates.

13. The arc chute assembly as claimed in claims 9 and 10, wherein force on the arc is in the upward direction.

14. An arc chute assembly for arc quenching comprising at least one top cover coupled to at least one side plate, and wherein said arc chute assembly is CHARACTERIZED IN THAT comprising at least one bended deion plate having:
comparatively sharper bend with a shorter vertical portion at least half a size of a longer vertical portion to achieve an arc voltage development; and
at least one protrusion extending out to assemble said bended deion plate with said side plate and/orat least one otherprotrusion extending out to assemble said bended deion plate withsaid top cover.