Description:TECHNICAL FIELD
[0001] The present disclosure relates to gas insulated switchgear. More particularly the present disclosure relates a protection mechanism for preventing line to earth fault in the gas insulated switchgear.

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] A gas insulated switchgear (GIS) board 102 receives power from upstream panels (such as another GIS 202) through cables. If connecting cable are faulty and need to be corrected, the system must be separated and earthed. To avoid line-to-earth faults, it should not be possible for someone to connect the system directly to the earth by accident. The system should be earthed only under specified system situations. During maintenance or defective situations, if the disconnector switch (DS) of (GIS) board 102 is in Earth position then the vacuum circuit breaker (VCB) is only accessible when the cable is dead.
[0004] Conventionally, this can be successfully obtained using a tool-based interlock, but in this interlock, it can be achieved using an electro-mechanical coil. To do Earthing, the cable must be dead, the incomer panel's DS 106 must be switched to EARTH and then only VCB is closed, which indicates that the cables are earthed.
[0005] There is, therefore, a need for a protection mechanism for GIS, which prevents any possibility of line to earth fault in the GIS. The present disclosure provides a blocking coil arrangement is installed at the VCB close push-button access of the incomer GIS 102. The blocking coil is a simple electromechanical coil that acts when the cable is dead, and the coil is powered by an auxiliary supply.

OBJECTS OF THE PRESENT DISCLOSURE
[0006] Some of the objects of the present disclosure, which at least one embodiment herein satisfy are as listed hereinbelow.
[0007] It is an object of the present disclosure to provide a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which limits any probablity of line to earth fault through the electromagnetic coil used in the gas insulated swithgear.
[0008] It is an object of the present disclosure to provide a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which increases reliablity and durablity of the gas insulated switchgear.
[0009] It is an object of the present disclosure to provide a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which prevents any possibility of injury to a maintenance worked doing some maintenance work of the gas insulate switchgear.
[0010] It is an object of the present disclosure to provide a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which is cost-effective as no complex electronic circuitry is used.
[0011] It is an object of the present disclosure to provide a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), It reduces operation time and increases safety compare to the conventional mechanical type interlock.

SUMMARY
[0012] The present disclosure relates to gas insulated switchgear. More particularly the present disclosure relates a protection mechanism for preventing line to earth fault in the gas insulated switchgear.
[0013] An aspect of the present disclosure pertains to a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS). The protection mechanism includes an electromagnetic coil electrically configured with a first disconnector switch of a first gas insulated switchgear. The electromagnetic coil comprises a plunger configured to move between a first position and a second position. An access shutter, for a vacuum circuit breaker of the GIS, operatively configured with the plunger such that when the plunger is in the first position the access shutter is restricted to be rotated to get access of the vacuum circuit breaker, and when the plunger is in the second position the access shutter is free to be rotated to get access of the voltage circuit breaker.
[0014] In an aspect, the first position of the plunger may correspond to when the plunger is extended out of the electromagnetic coil.
[0015] In an aspect, the second position of the plunger may correspond to when the plunger is retracted inside the electromagnetic coil.
[0016] In an aspect, the plunger may be moved to the second position when the electromagnetic coil is energised signifying any of a set of conditions are met.
[0017] In an aspect, the electromagnetic coil may be energised when the first disconnector switch is ON, when the first disconnector switch is OFF, and when the first disconnector switch is earthen and a second disconnector switch is OFF.
[0018] In an aspect, the second disconnector switch may be disposed in a second gas insulated switchgear providing input to the first gas insulated switchgear.
[0019] 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 DRAWINGS
[0020] 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. The diagrams are for illustration only, which thus is not a limitation of the present disclosure.
[0021] In the figures, similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
[0022] FIG. 1 illustrates an exemplary representation of a signal line diagram of a incomer GIS and upstream GIS, in accordance with an embodiment of the present disclosure.
[0023] FIG. 2 illustrates an exemplary representation a signal line diagram of electromagnetic coil coupled with the incomer GIS or the first GIS, in accordance with an embodiment of the present disclosure.
[0024] FIG. 3A-B illustrates an exemplary representation a plunger of the electromagnetic coil in the first position, in accordance with an embodiment of the present disclosure.
[0025] FIG. 4A-B illustrates an exemplary representation a plunger of the electromagnetic coil in the second position, in accordance with an embodiment of the present disclosure.
[0026] FIG. 5 illustrates an exemplary representation a signal line diagram of an access shutter of vacuum circuit breaker (VCB) of the incomer GIS and condition after cable earthed in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0027] 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 scope of the present disclosure as defined by the appended claims.
[0028] In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. It will be apparent to one skilled in the art that embodiments of the present invention may be practiced without some of these specific details.
[0029] The present disclosure relates to gas insulated switchgear. More particularly the present disclosure relates a protection mechanism for preventing line to earth fault in the gas insulated switchgear.
[0030] The present disclosure elaborates upon a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS). The protection mechanism includes an electromagnetic coil electrically configured with a first disconnector switch of the first gas insulated switchgear. The electromagnetic coil comprises a plunger configured to move between a first position and a second position. An access shutter, for a voltage circuit breaker of the GIS, operatively configured with the plunger such that when the plunger is in the first position the access shutter is restricted to be rotated to get access of the vacuum circuit breaker, and when the plunger is in the second position the access shutter is free to be rotated to get access of the vacuum circuit breaker.
[0031] In an embodiment, the first position of the plunger can correspond to when the plunger is extended out of the electromagnetic coil.
[0032] In an embodiment, the second position of the plunger can correspond to when the plunger is retracted inside the electromagnetic coil.
[0033] In an embodiment, the plunger can be moved to the second position when the electromagnetic coil is energised signifying any of a set of conditions are met.
[0034] In an embodiment, the electromagnetic coil can be energised when the first disconnector switch is ON, when the first disconnector switch is OFF, and when the first disconnector switch is earthen and a second disconnector switch is OFF.
[0035] In an embodiment, the second disconnector switch can be disposed in a second gas insulated switchgear providing input to the first second gas insulated switchgear.
[0036] FIG. 1 illustrates an exemplary representation of a signal line diagram of a incomer GIS and upstream GIS, in accordance with an embodiment of the present disclosure.
[0037] FIG. 2 illustrates an exemplary representation a signal line diagram of electromagnetic coil coupled with the incomer GIS or the first GIS, in accordance with an embodiment of the present disclosure.
[0038] FIG. 3A-B illustrates an exemplary representation a plunger of the electromagnetic coil in the first position, in accordance with an embodiment of the present disclosure.
[0039] FIG. 4A-B illustrates an exemplary representation a plunger of the electromagnetic coil in the second position, in accordance with an embodiment of the present disclosure.
[0040] FIG. 5 illustrates an exemplary representation a signal line diagram of an access shutter of vacuum circuit breaker (VCB) of the incomer GIS and condition after cable earthed in accordance with an embodiment of the present disclosure.
[0041] As illustrated, a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS) 102. The protection mechanism includes an electromagnetic coil 104 that can be electrically configured with a first disconnector switch 106 of the first gas insulated switchgear (GIS) 102. The electromagnetic coil 104 can include a plunger 104-1 that can be configured to move between a first position and a second position. An access shutter 108, for a voltage circuit breaker of the GIS 102, operatively configured with the plunger 104-1 such that when the plunger 104-1 is in the first position the access shutter can be restricted to be rotated to get access of the vacuum circuit breaker 110, and when the plunger 104-1 is in the second position the access shutter can be free to be rotated to get access of the voltage circuit breaker. The plunger 104-1 can be retractably configured with the electromagnetic coil 104 through an elastic member 104-2 such as but is not limited to spring.
[0042] In an embodiment, the first position of the plunger 104-1 can correspond to when the plunger is extended out of the electromagnetic coil 104. The second position of the plunger 104-1 can correspond to when the plunger 104-1 is retracted inside the electromagnetic coil 104. The plunger 104 can be moved to the second position when the electromagnetic coil 104 is energised signifying any of a set of conditions are met.
[0043] In an embodiment, the electromagnetic coil can be energised when the first disconnector switch 106 is ON, when the first disconnector switch 106 is OFF, and when the first disconnector switch 106 is earthen and a second disconnector 206 switch is OFF. The second disconnector switch 206 can be disposed in a second gas insulated switchgear 202 providing input to the first gas insulated switchgear 102.
[0044] The present disclosure facilitates limiting any probablity of line to earht fault through the electromagnetic coil used in the gas insulated swithgear. This can help increasing reliablity and durablity of the gas insulated switchgear. Also, this can help preventing any possibility of injury to a maintenance worked doing some maintenance work of the gas insulate switchgear.
[0045] Moreover, in interpreting the specification, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0046] 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
[0047] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which limits any probablity of line to earth fault through the electromagnetic coil used in the gas insulated swithgear.
[0048] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which increases reliablity and durablity of the gas insulated switchgear.
[0049] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which prevents any possibility of injury to a maintenance worked doing some maintenance work of the gas insulate switchgear.
[0050] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which is cost-effective as no complex electronic circuitry is used.
[0051] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), which is cost-effective as no complex electronic circuitry is used.
[0052] The proposed invention provides a protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), It reduces operation time and increases safety compare to the conventional mechanical type interlock.
, Claims:1. A protection mechanism for protecting line to earth fault in a gas insulated switchgear (GIS), the protection mechanism comprising:
an electromagnetic coil electrically configured with a first disconnector switch of the first gas insulated switchgear, wherein the electromagnetic coil comprises a plunger configured to move between a first position and a second position; and
an access shutter, for a vacuum circuit breaker of the GIS, operatively configured with the plunger such that when the plunger is in the first position the access shutter is restricted to be rotated to get access of the voltage circuit breaker, and when the plunger is in the second position the access shutter is free to be rotated to get access of the voltage circuit breaker.

2. The protection mechanism as claimed in claim 1, wherein the first position of the plunger corresponds to when the plunger is extended out of the electromagnetic coil.

3. The protection mechanism as claimed in claim 1, wherein the second position of the plunger corresponds to when the plunger is retracted inside the electromagnetic coil.

4. The protection mechanism as claimed in claim 1, wherein the plunger is moved to the second position when the electromagnetic coil is energised signifying any of a set of conditions are met.

5. The protection mechanism as claimed in claim 1, wherein the electromagnetic coil is energised when the first disconnector switch is ON, when the first disconnector switch is OFF, and when the first disconnector switch is earthen and a second disconnector switch is OFF.
6. The protection mechanism as claimed in claim 5, wherein the second disconnector switch is in a second gas insulated switchgear providing input to the first second gas insulated switchgear.