DESC:TECHNICAL FIELD

The present invention relates generally to a switchgears using arc quenching technologies and, more particularly, to breaking the current and clearing fault currents in switchgears using arc quenching technologies

BACKGROUND

The contacts of the circuit breaker experience the same during its opening i.e. an arc is formed between the contacts when they separate while interrupting a live circuit. 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.

In order to further improve the performance, the arc chute assembly comprises of a filter, which helps in the rapid cooling and lengthening of the arc, deionization of the arcing chamber and improved arc product filtering. This leads to improved arc quenching performance and also elimination of the risk of flashovers happening outside the breaker.

The disadvantage of the current technology is that the arc quenching process is not efficient and hence results in excessive contact erosion. Due to this, the electrical life of the breaker reduces. Another disadvantage is that the arc products such as molten metal, metal vapors, gases with high pressure and energy coming out of the arcing chamber are in an ionized state and may result in flashover outside the breaker and cause unwanted damage. In the case of open vents being provided on the arc chute cover, or absence of filter, the benefits of pressure development in quick deionization of the chamber is not realized. Due to the disadvantages listed above, the short circuit breaking performances are much lower.

Further, the current design and technology trend uses filter assembly made of static components only like perforated metallic plate, metal wires etc. Due to deposition of arc products, molten metal, metal vapor and soot, the metal sieves or plates can be blocked due to their static position. The venting property of the arc filter also can be blocked totally due to this. So the effective use of the arc filter (arc product filtering) reduces progressively with the current design and technology trend.

Also due to these static components of arc filter, part of the arc products and mainly gases reverts back into the chamber, which in turn will hamper the arc quenching performance.

The prior-art patent document US 8183490B2, discloses an arc chute design comprising of an insulating member (electrically non conductive material: glass melamine, glass epoxy sheet, polyester based material), placed in between the deion plates and the metallic filter, a filer component, perforated sheet metal having a wavy structure, and a stability member (Plate/sheet, rods, pins) adjacent to the filter (above it). This design servers the purpose of filtering arc products and minimizing the amount of gases coming outside the arc chamber.

The prior-art document US7176771B2 to Square D Company, discloses a circuit breaker filter assembly with an improved filter assembly for a circuit breaker includes a generally rectilinear filter housing having at least two filter mounting zones for receiving at least two filter assemblies, so as to define, in the aggregate, a filter assembly, and at least two filter assemblies configured for inter fitting with the filter mounting zones of the filter housing, each filter assembly comprising a generally rectilinear filter body having a given peripheral configuration and a filter gasket configured for inter fitting about a periphery of the filter body for sealingly engaging the filter body relative to the filter housing in response to forces encountered by the filter assembly both upon assembly and in operation.

The state of the art of the available technology is that, static filter components are being used for filtering the arc product and to provide venting of arc gases in safe manner comprising the involvement of valve effect. The current design and technology trend uses filter assembly made of static components only like perforated metallic plate, metal wires etc. Due to deposition of arc products, molten metal, metal vapor and soot, the metal sieves or plates can be blocked due to their static position. The venting property of the arc filter also can be blocked totally due to this. So the effective use of the arc filter (arc product filtering) reduces progressively with the current design and technology trend. Also due to these static components of arc filter, part of the arc products and mainly gases reverts back into the chamber, which in turn will hamper the arc quenching performance. Also current technology trend has very little to offer in terms of dealing with the high energy shock wave coming out of the arc filter and arc chute assembly.

In view of the above mentioned drawbacks or limitations of existing filter mechanism and techniques, there exists a need and scope to provide an improved arc chute filter which provides improved heat dissipation, minimizing the effect of arc gases going backward and high energy of shock wave coming out, improved arc product filtering, minimizing the chance of blockage of vents and better arc quenching performance and thereby eliminating the risk of flashover outside the breaker.

SUMMARY

This summary is provided to introduce concepts related to an electric circuit breaker arc chute with an improved filter assemblyto provide an improved arc quenching and arc products filtering using a filter concept. This summary is not intended to identify essential features of the subject matter nor is it intended for use in determining or limiting the scope of the subject matter.

In one implementation, the present invention provides an improved arc chute filter which provides better arc quenching performance, improved heat dissipation and arc product filtering, thereby eliminating the risk of flashover outside the breaker.

In one implementation, the present invention is an arc chute filter, which by virtue of the design provided helps in better arc quenching performance, prevention of emission of flame and/or ionized gases, improved heat dissipation and arc product filtering, thereby eliminating the risk of flashover outside the breaker.

In one implementation, the present invention provides an immobilization time in the arc quenching process, which is referred to as the time duration for which the arc stays on the contacts. Due to the increased magnetic pull on the arc due to the ferromagnetic components in the filter, this time is reduced by a large extent. Therefore, the contact erosion is much lesser and hence the electrical life of the breaker increases.

In one implementation, the proposed invention increase a magnetic pull on the arc due to the ferromagnetic components in the filter also helps in greater lengthening of the arc in the arc splitting phase and hence ensures that a greater arc voltage is developed. Therefore forced current zero condition is reached quickly and hence arc quenching process is quicker.

In one implementation, the proposed invention also uses a filter concept to ensure that the pressure development within the chamber is increased. As per proven study,greater the pressure development in the chamber, greater is the rate of deionization and lesser the rate of ionization in the chamber. This further reduces the arc quenching duration.

In one implementation, the proposed invention provides heat dissipation. During arcing, hot and ionized gases are produced. By virtue of the construction and material of the filter, the heat dissipation of these gases is increased. This is done by increasing the length of the path travelled by the gases and by increasing the interaction of the gases with thermally conducting materials. This results in cooling and deionization of the chamber. Also, by virtue of design, since the metallic filter has granules which are dynamic in nature, the property of energy absorption and conversion to another form of energy is made use of. A part of the heat energy is used in order to cause motion of the granules. This helps in energy reduction and cooling of the gases and hence quicker and effective arc quenching.

In one implementation, the proposed invention by virtue of design, the arc products are prevented from exiting the chamber causing flashover and deposition of molten metal, metal vapor and soot happens. And since the granules of the filter are dynamic the sieves do not block upon repeated use as well due to deposition of arc products. Hence filtering of arc products does not reduce with use.

In one implementation, the proposed invention has the granules that have an aerodynamic profile where the gases interact, this helps in smooth flow of gases into the filter.

In one implementation, using the proposed invention and the proposed changes in the design, the short circuit breaking performance can be enhanced.

In one implementation, the present invention by virtue of its design, the arc products are prevented from exiting the chamber causing flashover and deposition of molten metal, metal vapor and soot happens. As the granules of the filter in the present invention are dynamic the sieves do not block upon repeated use as well due to deposition of arc products. Hence filtering of arc products does not reduce with use. Since the granules in the present invention have an aerodynamic profile where the gases interact, it helps in smooth flow of gases into the filter.

Accordingly, in one implementation, a filter assembly (1) for an electric circuit breaker is disclosed. The filter assembly (1) comprises of at least one filter holder (5), at least one perforated metal plate (6), and at least one non conductive gassing plate (7) to hold at least one layers of granule (8).The filter assembly (1) is assembled within an arc chute assembly of said electric circuit breaker, which further comprises of at least one top plate (2), at least one side palate (3); and at least one de-ion plates (4).

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.

Figure 1 illustrates a filter assembly (1) in the arc chute assemblyis shown, in accordance with an embodiment of the present subject matter.

Figure 2 illustrates a bottom and side view in 3D of the filter assembly (1) is shown, in accordance with an embodiment of the present subject matter.

Figure 3 illustrates a top and side view in 3D of the filter assembly (1)is shown, in accordance with an embodiment of the present subject matter.

Figure 4 illustrates a side view of the cross sectionto an embodiment of filter assembly (1) in arc chute shown, in accordance with an embodiment of the present subject matter.

Figure 5 illustrates a cross sectional view in 3D to an embodiment of filter assembly (1) in arc chute is shown, in accordance with an embodiment of the present subject matter.

Figure 6 illustrates a detailed view of cooling plates and supporting fixtures view in 3D to an embodiment of filter assembly (1) in arc chute is shown, in accordance with an embodiment of the present subject matter.

Figure 7 illustrates a space for filter assembly in between the top and bottom cover of the arc chute assembly shown, in accordance with an embodiment of the present subject matter.

Figure 8 illustrates an isometric view of filter assembly (1) with and without casing (5)is shown, in accordance with an embodiment of the present subject matter.

Figure 9 illustrates a partial view of filter assembly (1) without casing (5) and without insulating bottom plate (7) and partial bottom view (without insulating bottom plate (7)) of the filter assembly (1) is shown, in accordance with an embodiment of the present subject matter.

Figure 10 illustrates a detail partial side view (without casing (5)) of filter assembly (1) is shown, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION

Preferred embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.

The terms and words used in the following description 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.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

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.

The present invention consists of a casing for a filter assembly, a top metal plate, multiple layers of metallic granules, multiple layers of metallic sieves or wires and bottom insulating plate.

In one implementation, the present invention of filter assembly in arc chute consists of filter assembly (1),top plate (2), at least one side plate (3) and de-ion plates (4). The filter assembly (1) consists of filter holder(5), non conductive gassing plates (7) on top and multiple layers of perforated metal plates or sieves (6) to hold multiple layers of granules (8).

The main purpose of the filter is to filter the arc products coming out of the arc chute. This is to ensure that there is no possibility of flashover happening outside the breaker. Also the filter ensures lesser contact erosion by reducing the immobilization and arc quenching time, thereby increasing the electrical life of the breaker. Increased pressure development also helps reduce the arcing duration.

In one implementation, the present invention is an arc chute filter, which by virtue of the design provided helps in better arc quenching performance, prevention of emission of flame and/or ionized gases, improved heat dissipation and arc product filtering, thereby eliminating the risk of flashover outside the breaker. This invention is of use in the switchgear industry.

In one implementation, the present invention is on the filter, which is a component used in switchgear products like circuit breakers along with the arc chute. A circuit breaker is a device used in order to make, carry and break rated current and to clear a fault current. Whenever fault current flows in the system, the circuit breaker used is expected to clear this fault with minimal damage to itself also along with the downstream devices, so that the breaker can be used for further operations. Opening of live contacts of a circuit breaker results in the formation of an electric arc between the contacts. The electric 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 the filter along with arc chutes play an important role in it. Also the arc products coming out of the arcing chamber must be in a de-ionized state such that there is no possibility of flashover taking place outside the breaker due to these gases. The filter plays an important role in de ionizing and filtering the arc products coming out of the chamber.

This invention of arc filter assembly may be assembled within the arc chute assembly. This can be assembled between the top and the bottom cover plate may be over deion plate assembly in the arc chute. Any other effective arrangement of assembly to incorporate the filter assembly over deion plates also can be possible.

The filter designed consists of four components. The first component is of a non conductive material with gassing properties (7). Some examples of material which can be used here are melamine, glass polyester etc. The main purpose of this sheet (7) is to isolate the metallic filter from the arc chutes. Also upon heating, the sheet (7) emits electronegative gases. This helps in increasing the arc chamber pressure and internal cooling of the arc and also improving the arc quenching performance by greater development of dielectric strength within the chamber. This component (7)may be assembled with rest of the filter assembly at the time of assembling the arc chute, otherwise any possible provision for making this assembly can also be done.

The second component is the casing (5) of the filter which can be a metallic or nonmetallic and forms the casing (5) of the filter granules (8). The bottom of the casing (5) consists of multiple layers of metallic sieves (6), with the openings of each sieve progressively decreasing with each layer. Here metallic wires and metallic wire mesh also can be used. Also it is ensured that the openings of each sieve are kept slightly at an offset with the previous layer. The purpose of this component is to filter the arc products and de-ionize the gases to a certain extent before they enter to the component layer. The zigzag path for the gases through the metal sieve (6) or metal wire mesh layers elongates the travel path of the exiting gas, thus helps in dissipation of heat and energy of the gas. The casing can also be made from this metallic sieves (6) forming the assembly structure. The sides of the casing (5) are meant in order to hold the third component. Also the casing (5) can be used to hold all the other components of the filter assembly (1), thus giving the structural support to the filter assembly (1).

In one implementation, the bottom of the casing (5) consists of multiple layers of metallic sieves (6), with the openings of each sieve progressively decreasing with each layer. Also it is ensured that the openings of each sieve (6) are kept slightly at an offset with the previous layer.The purpose of this component is to filter the arc products and de-ionize the gases to a certain extent before they enter the third component. The sides of the casing (5) are meant in order to hold the third component (8).

The third component consists of multiple layers of granules (8) which may be spherical (can be of other shape also) in nature. These granules (8) are filled into the holder or stacked one upon the other such that they occupy most of the volume forming multiple layers of the filter casing (5). There is some volume of the casing which is left unoccupied. The purpose of these granules (8) is to cool the gases by lengthening and also by greater thermal interaction. The granules can be made of metallic (can be non metallic also) material and/or materials having high thermal conductivity and/or magnetic properties. Plating or coating of materials having high thermal conductivity and/or magnetic properties on the granules can also be used. Some space in the casing is left in order to enable movement of the granules (8). This enables transfer of heat energy of the gases to motion of granules. Hence better cooling of the arc is attained.

Above the granule layers single/multiple layers of metal sieves (6) can also be assembled.

In one implementation, third component (8) consists of multiple layers of granules (8) which may be spherical in nature. These granules (8) are filled into the holder or stacked one upon the other such that they occupy most of the volume of the filter casing (5). There is some volume of the casing which is left unoccupied. The purpose of these granules (8) is to cool the gases by lengthening and also by greater thermal interaction. The granules (8) can be made of metallic material and/or materials having high thermal conductivity and/or magnetic properties. Some space in the casing is left in order to enable movement of the granules (8). This enables transfer of heat energy of the gases to motion of granules (8). Hence better cooling of the arc is attained.

The fourth component of the filter is made of multiple layers (can be single also) of perforated metal plates (6) placed such that the perforations are at an offset to one another for venting of gases. This also gives the required strength to the arc filter assembly along with the other components of this filter assembly (1) to withstand the high pressure generated due to arcing.

In one implementation, a filter assembly (1) for an electric circuit breaker is disclosed. The filter assembly (1) comprises of at least one filter holder (5), at least one perforated metal plate (6), and at least one non conductive gassing plate (7) to hold at least one layers of granule (8). The filter assembly (1) is assembled within an arc chute assembly of said electric circuit breaker, which further comprises of at least one top plate (2), at least one side palate (3); and at least one de-ion plates (4).

In one implementation, said wherein at least one filter holder (5) said is a metal casing of said filter assembly (1).

In one implementation, said at least one filter holder (5) said is a non-metal casing of said filter assembly (1).

In one implementation, said at least one filter holder (5) filters arc products and de-ionizes gases in arc chamber.

In one implementation, said at least one perforated metal plate (6) has perforations and is placed such that the perforations are at an offset to one another for venting of gases.

In one implementation, said at least one non conductive gassing plate (7) is a non conductive material with gassing properties and isolates said filter assembly (1) from said arc chute assembly.

In one implementation, said at least one layers of granule (8) are filled into said at least one filter holder (5) and occupies most of the volume forming multiple layers of said at least one filter holder (5).

In one implementation, said filter assembly (1) de-ionizes and filters said arc products coming out of arc chamber.

In one implementation, said at least one layers of granule (8) are dynamic in nature and has property of absorbing and purging heat energy by using a component thereof for their movement.

In one implementation, the working principle of the present invention is as given below:
1. The usage of the nonconductive gassing material sheet is to isolate the metallic filter from the arc chutes. Also upon heating, the sheet gives electronegative gasses. This helps in increasing the arc chamber pressure, the internal cooling of the arc, better quenching due to high dielectric strength. This results in quicker and effective arc quenching.
2. The usage of metallic sieve or wire mesh to hold the granule layers and to filter the arc products and de-ionize the gases to a certain extent before they enter to the next granules component layer.
3. The arrangements of multiple layers of metallic sieves or wire mesh, with the openings of each sieve progressively decreasing with each layer for proper filtering of the arc products.
4. The usage of multiple layers (can be single also) of perforated metal plates placed such that the perforations are at an offset to one another for venting of gases. This also gives the required strength to the arc filter assembly along with the other components of this filter assembly to withstand the high pressure generated due to arcing.
5. The zigzag path for the gases through the metal sieve or metal wire mesh layers, metallic or non metallic granule layers and the through the perforated metallic plates elongates the travel path of the exiting gas, thus helps in dissipation of heat and energy and deionization of the gases.
6. Usage of metallic or non metallic granules for improved arc quenching performance.
7. Micro splitting of arc/ionized gases through the vents created by randomly distributed metallic granules, thus dynamic elongation of gas travel path. A greater amount of cooling can be achieved. This will help in pressure building also in the arc chamber and thus helping in arc extinguishing.
8. As these granules are metallic, so it absorbs the heat energy from ionized gases efficiently.
9. Deionization of the gases and the arc chamber by the metallic granules.
10. Deposition of metal vapors can be achieved. Due to depositions and soot, the metal sieves or plates can be blocked due to their static position, but with the dynamic behavior of metallic granules, probability of this to happen is very less.
11. Here also the total volume occupied by metallic granules in the cassette is little less with respect to the cassette’s internal volume. So by movement/displacement it can absorb extra energy from the arc gases due to the dynamic behavior of metallic granules inside the cassette. Gas particles have to do extra work and thus loosing energy due to movement of metallic granules.
12. The dynamic behavior (movement/displacement) of the metallic granules also helps to reduce the amount of gases which can go backward into the arc chamber after hitting the otherwise solid static metal sieves or plates. This little valve effect achieved by movement/displacement of metal granules can be of significant importance in case of high pressure during high current breaking.
13. As the metallic granules are ferromagnetic in nature, so can be of help to the magnet pull to the arc.
14. Dispersing of the shock wave generated in the arc chamber can also be achieved through the dynamic behavior of the granules.

In one implementation, the main purpose of the filter is to filter the arc products coming out of the arc chute. This is to ensure that there is no possibility of flashover happening outside the breaker. Also the filter ensures lesser contact erosion by reducing the immobilization and arc quenching time, thereby increasing the electrical life of the breaker. Increased pressure development also helps reduce the arcing duration.

Micro splitting of arc/ionized gases through the vents created by randomly distributed metallic granules, thus dynamic elongation of gas travel path. A greater amount of cooling can be achieved. This will help in pressure building also in the arc chamber and thus helping in arc extinguishing.

As these granules are metallic, so it absorbs the heat energy from ionized gases efficiently. Deionization of the gases and the arc chamber occurs by the metallic granules. Deposition of metal vapors can be achieved. Due to depositions and soot, the metal sieves or plates can be blocked due to their static position, but with the dynamic behavior of metallic granules, this can be avoided. Here also the total volume occupied by metallic granules in the cassette is little less with respect to the cassette’s internal volume. So by movement/displacement, it can absorb extra energy from the arc gases due to the dynamic behavior of metallic granules inside the cassette. Gas particles have to do extra work and thus loosing energy due to movement of metallic granules. The dynamic behavior (movement/displacement) of the metallic granules also helps to reduce the amount of gases which can go backward into the arc chamber after hitting the otherwise solid static metal sieves or plates. This little valve effect achieved by movement/displacement of metal granules can be of significant importance in case of high pressure during high current breaking.

As the metallic granules are ferromagnetic in nature, so it helps in the magnet pull to the arc. Dispersing of the shock wave generated in the arc chamber can also be achieved through the dynamic behavior of the granules.

To summarize, the current invention helps in effective arc quenching, reducing total arcing time, minimizes the possibility of flashover, minimizes the possibility of damage outside the breaker due to arc products, reduces the gas energy coming outside the arc chute assembly, minimizes the possibility of blockage of filter assembly due to the dynamic properties of granules, thus providing improved venting of gases, reduces the amount of gases which reverts back due to static components, thus improved venting under high pressure.

Referring now to figures:

Figure 1 illustrates a filter assembly (1) in the arc chute assembly is shown, in accordance with an embodiment of the present subject matter.

Figure 2 illustrates a bottom and side view in 3D of the filter assembly (1)is shown, in accordance with an embodiment of the present subject matter.

Figure 3 illustrates a top and side view in 3D of the filter assembly (1)is shown, in accordance with an embodiment of the present subject matter.

Figure 4 illustrates a side view of the cross sectionto an embodiment of filter assembly (1) in arc chute shown, in accordance with an embodiment of the present subject matter.

Figure 5 illustrates a cross sectional view in 3D to an embodiment of filter assembly (1) in arc chute is shown, in accordance with an embodiment of the present subject matter.

Figure 6 illustrates a detailed view of cooling plates and supporting fixtures view in 3D to an embodiment of filter assembly (1) in arc chute is shown, in accordance with an embodiment of the present subject matter.

Figure 7 illustrates a space for filter assembly in between the top and bottom cover of the arc chute assembly shown, in accordance with an embodiment of the present subject matter.

Figure 8 illustrates an isometric view of filter assembly (1) with and without casing (5) is shown, in accordance with an embodiment of the present subject matter.

Figure 9 illustrates a partial view of filter assembly (1) without casing (5) and without insulating bottom plate (7) and partial bottom view (without insulating bottom plate (7)) of the filter assembly (1) is shown, in accordance with an embodiment of the present subject matter.

Figure 10 illustrates a detail partial side view (without casing (5)) of filter assembly (1) is shown, in accordance with an embodiment of the present subject matter.

It is well understood by the person skilled in the art that, only the necessary details that are related to the present invention are disclosed in the present invention, also the details of the figures as explained in the specification are to be considered as an exemplary embodiment of the present invention.

Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features:

One feature of the invention is that, the proposed invention increases the life of product. This change would not call for any change in application logic. This change would not call for product redesigning and hence no effect to ongoing production of the product.

One feature of the invention is that, the proposed invention uses granules for arc quenching and arc product filtering in switchgear.

Another feature of the invention is that, the usage of granules in the arc filter for arc quenching and arc product filtering in switchgear.

Another feature of the invention is that, the dynamic feature of the granules, which overcomes the short comings of the current design and technology trend of using static components for arc product filtering.

Another feature of the invention is that, a metallic or non metallic granules can be used, having high thermal conductivity and/or magnetic properties. Plating or coating of materials having high thermal conductivity and/or magnetic properties on the granules can also be used.

Another feature of the invention is that, the arrangement and sequence of components in this invention, which are the gassing material sheet, metal wire or sieve, metallic or non metallic granules, and perforated metallic plate in the arc filter assembly, is effective for quenching and filtering the arc and any other relevant and effective arrangement of these components for forming the filter assembly also can be used for the same purpose.

Another feature of the invention is that, the invention of arc filter assembly can be assembled within the arc chute assembly. This can be assembled between the top and bottom cover plate over deion plate assembly in the arc chute. Any other effective arrangement of assembly to incorporate the filter assembly over deion plates also can be possible.

Another feature of the invention is that, the usage of the nonconductive gassing material sheet is to isolate the metallic filter from the arc chutes. Also upon heating, the sheet gives electronegative gasses. This helps in increasing the arc chamber pressure, the internal cooling of the arc, better quenching due to high dielectric strength. This results in quicker and effective arc quenching.

Another feature of the invention is that, the usage of metallic sieve or wire mesh to hold the granule layers and to filter the arc products and de-ionize the gases to a certain extent before they enter to the next granules component layer.

Another feature of the invention is that, the arrangements of multiple layers of metallic sieves or wire mesh, with the openings of each sieve progressively decreasing with each layer for proper filtering of the arc products.

Another feature of the invention is that, the usage of multiple layers (can be single also) of perforated metal plates placed such that the perforations are at an offset to one another for venting of gases. This also gives the required strength to the arc filter assembly along with the other components of this filter assembly to withstand the high pressure generated due to arcing.

Another feature of the invention is that, the zigzag path for the gases through the metal sieve or metal wire mesh layers, metallic or non metallic granule layers and the through the perforated metallic plates elongates the travel path of the exiting gas, thus helps in dissipation of heat and energy and deionization of the gases.

Another feature of the invention is that, the usage of metallic or non metallic granules for improved arc quenching performance.

Another feature of the invention is that, the micro splitting of arc/ionized gases through the vents created by randomly distributed metallic granules, thus dynamic elongation of gas travel path. A greater amount of cooling can be achieved. This will help in pressure building also in the arc chamber and thus helping in arc extinguishing.

Another feature of the invention is that, the granules are metallic, so it absorbs the heat energy from ionized gases efficiently.

Another feature of the invention is that, the deionization of the gases and the arc chamber by the metallic granules.

Another feature of the invention is that, the deposition of metal vapors can be achieved. Due to depositions and soot, the metal sieves or plates can be blocked due to their static position, but with the dynamic behavior of metallic granules, probability of this to happen is very less.

Another feature of the invention is that, the total volume occupied by metallic granules in the cassette is little less with respect to the cassette’s internal volume. So by movement/displacement it can absorb extra energy from the arc gases due to the dynamic behavior of metallic granules inside the cassette. Gas particles have to do extra work and thus loosing energy due to movement of metallic granules.

Yet another feature of the invention is that, the dynamic behavior (movement/displacement) of the metallic granules also helps to reduce the amount of gases which can go backward into the arc chamber after hitting the otherwise solid static metal sieves or plates. This little valve effect achieved by movement/displacement of metal granules can be of significant importance in case of high pressure during high current breaking.

Yet another feature of the invention is that, as the metallic granules are ferromagnetic in nature, so can be of help to the magnet pull to the arc.

Still another feature of the invention is that, the dispersing of the shock wave generated in the arc chamber can also be achieved through the dynamic behavior of the granules.

Although implementations for an improved arc quenching and arc products filtering using a filter concept have been described in language specific to structural features and/or the methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described.

Rather, the specific features are disclosed as examples ofthe improved arc quenching and arc products filter using a filter concept.

Although implementations for an electric circuit breaker arc chute with an improved filter assembly to provide an improved arc quenching and arc products filtering using a filter concepthave been described in language specific to structural features and/or the methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features are disclosed as examples of the an electric circuit breaker arc chute with an improved filter assembly to provide an improved arc quenching and arc products filtering using a filter concept.
,CLAIMS:1. A filter assembly (1) for an electric circuit breaker, the filter assembly (1) comprising:
at least one filter holder(5);
at least one perforated metal plate (6);
at least one non conductive gassing plate (7) to hold at least one layers of granule (8).

2. The filter assembly (1) as claimed in claim 1 is assembled within an arc chute assembly of said electric circuit breaker, wherein said arc chute assembly comprises of
at least one top plate (2);
at least one side palate (3); and
at least one de-ion plates (4).

3. The filter assembly (1) as claimed in claims 1 and 2, wherein said at least one filter holder (5)is a metal casing of said filter assembly (1).

4. The filter assembly (1) as claimed in claims 1 and 2, whereinsaid at least one filter holder (5) is a non-metal casing of said filter assembly (1).

5. The filter assembly (1) as claimed in claims 1-4, wherein at least one filters holder (5) filtersarc products and de-ionizes gases in arc chamber.

6. The filter assembly (1) as claimed in claims 1-5, wherein said at least one perforated metal plate (6) has perforations and is placed such that the perforations are at an offset to one another for venting of gases.

7. The filter assembly (1) as claimed in claims 1-6, wherein at least one non conductive gassing plate (7) is a non conductive material with gassing properties and isolates said filter assembly (1) from said arc chute assembly.

8. The filter assembly (1) as claimed in claims 1-7, wherein at least one layers of granule (8) are filled into said at least one filter holder(5) and occupies most of the volume forming multiple layers of said at least one filter holder(5).

9. The filter assembly (1) as claimed in claims 1-7, wherein said filter assembly (1)de-ionizes and filterssaid arc products coming out of arc chamber.

10. The filter assembly (1) as claimed in claims 1-9, wherein at least one layers of granule (8) are dynamic in nature and has property of absorbing and purging heat energy by using a component thereof for their movement.