CLIAMS:1. A voltage sensing arrangement for an electrical switching device comprising:
an actuator 102 mounted on a plunger 104, wherein the plunger 104 has a slot 112; and
a latch 108 operatively coupled with the actuator 102 such that when the plunger 104 is in picked-up condition, the latch 108 holds the plunger 104 through the actuator 102, and when the plunger 104 is in drop-off condition, the latch 108 releases the plunger 104 through the actuator, and wherein when the plunger 104 is released, the slot 112 engages with a screw member 110 to enable adjustment in length of the plunger 104.
2. The voltage sensing arrangement of claim 1, wherein the actuator 102 and the plunger 104 are housed in a housing 106.
3. The voltage sensing arrangement of claim 2, wherein the length adjustment is based on distance between bottom of the housing 106 and bottom of the screw member 110.
4. The voltage sensing arrangement of claim 1, wherein output of the voltage sensing arrangement is based on adjusted length of the plunger 104.
5. The voltage sensing arrangement of claim 1, wherein the screw member 110 is adjusted using a key to adjust the length of the plunger 104.
6. The voltage sensing arrangement of claim 1, wherein the arrangement ensures single degree of freedom.
7. A circuit breaker operatively coupled with a voltage sensing arrangement, wherein the voltage sensing arrangement comprises
an actuator 102 mounted on a plunger 104, wherein the plunger 104 has a slot 112; and
a latch 108 operatively coupled with the actuator 102 such that when the plunger 104 is in picked-up condition, the latch 108 holds the plunger 104 through the actuator 102, and when the plunger 104 is in drop-off condition, the latch 108 releases the plunger 104 through the actuator, and wherein when the plunger 104 is released, the slot 112 engages with a screw member 110 to enable adjustment in length of the plunger 104.
,TagSPECI:TECHNICAL FIELD
[0001] The present disclosure generally relates to protection/switching devices. In particular, the present disclosure relates to a voltage sensing arrangement for electrical switching devices such as circuit breakers.

BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] An electrical switching device such as a circuit breaker may be defined as a unit configured to connect, carry, disconnect electrical supply, and protect the equipments connected in electrical circuit from damage caused by overload, under-voltage, or short circuit, etc. A circuit breaker is a commonly used electrical switching device, wherein solenoid based voltage sensing devices/arrangements are typically used to detect abnormalities in voltage supply and give a signal to the circuit breaker. In such abnormal conditions, the circuit breaker trips, thereby protecting the electrical appliances connected to the circuit breaker. In normal voltage condition, the sensing devices are made inactive and they do not interfere the functioning of circuit breakers.
[0004] Existing switchgear manufacturers provide a voltage sensing arrangement with fixed actuation length (Plunger length) travel, making the sensing arrangement rigid. Furthermore, output of existing voltage sensing arrangements, in most cases, in terms of force, remains unique for single entity. Furthermore, manufacturing process variations in voltage sensing arrangements need to be adopted for the switchgear on which they are mounted, and therefore there are no assembly changes that are possible after the final configuration, again making the architecture/arrangement rigid.
[0005] There is therefore a need in the art for an arrangement to achieve adjustable plunger travel so that output of the sensing arrangement can be controlled with respect to the process variations in assembly.
[0006] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0007] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0008] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0009] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0010] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.

OBJECTS OF THE INVENTION
[0011] An object of the present disclosure is to provide a voltage sensing arrangement that achieves adjustable plunger travel so that output of the sensing arrangement can be controlled with respect to process variations in assembly.
[0012] An object of the present disclosure is to provide a voltage sensing arrangement that overcomes limitations of assembly deviations of existing sensing arrangements when mounted on the switchgear interface.
[0013] An object of the present disclosure is to provide a voltage sensing arrangement that has a well controlled and adjusted output.
[0014] An object of the present disclosure is to provide a voltage sensing arrangement of which the plunger length can be altered by using grub screw member to allow optimum interaction between the sensing arrangement and the switchgear.

SUMMARY
[0015] The present disclosure generally relates to protection/switching devices. In particular, the present disclosure relates to a voltage sensing arrangement for electrical switching devices such as circuit breakers.
[0016] According to one embodiment, the present disclosure provides a voltage sensing arrangement for an electrical switching device including an actuator mounted on a plunger that has a slot, and a latch that is operatively coupled with the actuator such that when the plunger is in picked-up condition, the latch holds the plunger through the actuator, and when the plunger is in drop-off condition, the latch releases the plunger through the actuator, and wherein when the plunger is released, the slot engages with a screw member to enable adjustment in length of the plunger.
[0017] According to one embodiment, the actuator and the plunger can be housed in a housing, wherein the length adjustment can be based on distance between bottom of the housing and bottom of the screw member. According to another embodiment, output of the voltage sensing arrangement can be based on adjusted length of the plunger.
[0018] In an aspect, the screw member can be adjusted using a key to adjust the length of the plunger. In yet another embodiment, the arrangement ensures single degree of freedom.
[0019] Aspects of the present disclosure further relate to a circuit breaker that is operatively coupled with a voltage sensing arrangement, wherein the voltage sensing arrangement can include an actuator that is mounted on a plunger that has a slot, and can further include a latch that is operatively coupled with the actuator such that when the plunger is in picked-up condition, the latch holds the plunger through the actuator, and when the plunger is in drop-off condition, the latch releases the plunger through the actuator, and wherein when the plunger is released, the slot engages with a screw member to enable adjustment in length of the plunger.
[0020] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0022] FIG. 1 illustrates an exemplary voltage sensing arrangement in picked-up condition of the plunger in accordance with an embodiment of the present disclosure.
[0023] FIG. 2 illustrates another representation of the exemplary voltage sensing arrangement with change in plunger length in accordance with an embodiment of the present disclosure.
[0024] FIG. 3 illustrates another representation of the exemplary voltage sensing arrangement in drop-off condition of the plunger in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0025] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0026] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0027] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0028] The present disclosure generally relates to protection/switching devices. In particular, the present disclosure relates to a voltage sensing arrangement for electrical switching devices such as circuit breakers.
[0029] According to one embodiment, the present disclosure provides a voltage sensing arrangement for an electrical switching device including an actuator mounted on a plunger that has a slot, and a latch that is operatively coupled with the actuator such that when the plunger is in picked-up condition, the latch holds the plunger through the actuator, and when the plunger is in drop-off condition, the latch releases the plunger through the actuator, and wherein when the plunger is released, the slot engages with a screw member to enable adjustment in length of the plunger.
[0030] According to one embodiment, the actuator and the plunger can be housed in a housing, wherein the length adjustment can be based on distance between bottom of the housing and bottom of the screw member. According to another embodiment, output of the voltage sensing arrangement can be based on adjusted length of the plunger.
[0031] In an aspect, the screw member can be adjusted using a key to adjust the length of the plunger. In yet another embodiment, the arrangement ensures single degree of freedom.
[0032] Aspects of the present disclosure further relate to a circuit breaker that is operatively coupled with a voltage sensing arrangement, wherein the voltage sensing arrangement can include an actuator that is mounted on a plunger that has a slot, and can further include a latch that is operatively coupled with the actuator such that when the plunger is in picked-up condition, the latch holds the plunger through the actuator, and when the plunger is in drop-off condition, the latch releases the plunger through the actuator, and wherein when the plunger is released, the slot engages with a screw member to enable adjustment in length of the plunger.
[0033] Various embodiments and features shall now be described in detail with reference to drawings.
[0034] With reference to FIGs. 1-3, the present disclosure provides a voltage sensing arrangement for an electrical switching device, wherein the voltage sensing arrangement 100 includes an actuator 102 mounted on a plunger 104, wherein the plunger 104 has a slot 112. The voltage sensing arrangement 100 further includes a latch 108 that is operatively coupled with the actuator 102 such that when the plunger 104 is in picked-up condition, the latch 108 holds the plunger 104 through the actuator 102, and when the plunger 104 is in drop-off condition, the latch 108 releases the plunger 104 through the actuator, and wherein when the plunger 104 is released, the slot 112 engages with a screw member 110 to enable adjustment in length of the plunger 104.
[0035] According to one embodiment, the actuator 102 and the plunger 104 can be housed in a housing 106, wherein the length adjustment can be based on distance between bottom of the housing 106 and bottom of the screw member 110.
[0036] According to another embodiment, output of the voltage sensing arrangement 100 can be based on adjusted length of the plunger 104. In yet another embodiment, the screw member 110 can be adjusted using a key to adjust the length of the plunger 104. In yet another aspect, the arrangement can ensure a single degree of freedom.
[0037] In yet another embodiment, the present disclosure provides a circuit breaker that is operatively coupled with a voltage sensing arrangement 100, wherein the voltage sensing arrangement can include an actuator 102 mounted on a plunger 104, wherein the plunger 104 has a slot 112. The voltage sensing arrangement 100 further includes a latch 108 that is operatively coupled with the actuator 102 such that when the plunger 104 is in picked-up condition, the latch 108 holds the plunger 104 through the actuator 102, and when the plunger 104 is in drop-off condition, the latch 108 releases the plunger 104 through the actuator, and wherein when the plunger 104 is released, the slot 112 engages with a screw member 110 to enable adjustment in length of the plunger 104.
[0038] According to another embodiment, the present disclosure includes a voltage sensing arrangement 100 having an actuator 102 that is mounted on a metallic plunger 104 housed in a housing 106 as shown in Fig .1. In another embodiment, there can be two basic conditions of plunger resting viz. Picked up & Drop-off condition, wherein, in the picked-up condition, latch 108 can hold the actuator 102 as shown in Fig.1. In Drop-off condition, on the other hand, the latch 108 can release the plunger 104 as shown in Fig.3. There can also be a grub screw member 110 provided, which can be fastened in a threaded slot 112 provided in the bottom of the plunger 104. In an implementation, the plunger 104 can travel based on the plunger length, which in view of the Fig.3, can be defined as the distance between housing bottom and grub screw member’s bottom surface. The plunger length can be adjusted considering the process variations and assembly constraints.
[0039] According to one embodiment, Plunger 104 and actuator 102 can be rigidly fixed in the voltage sensing arrangement 100, wherein grub screw member 110 can be adjusted by using a hexagonal allen key, and plunger length can be adjusted. Voltage can be sensed by the arrangement 100 and in picked-up condition, latch 108 can hold the actuator 102, whereas in drop-off condition, the latch 108 can release the plunger 104.
[0040] According to another embodiment, the proposed solenoid arrangement can be enclosed in the housing 106 that ensures single degree of freedom. Based on the assembly of sensing arrangement 100, the plunger length can be controlled and grub screw member 110 can be fixed in the arrangement as shown in Fig 2.
[0041] The present disclosure therefore allows controlled plunger length of voltage sensing arrangement, enhances reliability in transmission of forces, enhances reliability of operation, and provides an economical option as same unit can be used for different frame and size of switchgear device.
[0042] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[0043] The present disclosure provides a voltage sensing arrangement that achieves adjustable plunger travel so that output of the sensing arrangement can be controlled with respect to process variations in assembly.
[0044] The present disclosure provides a voltage sensing arrangement that overcomes limitations of assembly deviations of existing sensing arrangements when mounted on the switchgear interface.
[0045] The present disclosure provides a voltage sensing arrangement that has a well controlled and adjusted output.
[0046] The present disclosure provides a voltage sensing arrangement of which the plunger length can be altered by using grub screw member to allow optimum interaction between the sensing arrangement and the switchgear.