The present disclosure relates to the field of gas insulated
switchgear. More particularly the present disclosure relates to a system for tripping the vacuum circuit breaker of gas insulated switchgear in case of over pressure and under pressure condition.
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] Main constituent of a gas insulated switchgear is sulphur
hexafluoride (SF6). SF6 has the dielectric strength which is almost thrice of air. This helps to reduce the footprint of switchgear. Introduction of SF6 makes the gas insulated switchgear compact as compared to air insulated switchgear. The SF6 of defined amount is filled in the tank to achieve the desired dielectric strength. However, if the SF6 is more/less compared to the desired range then there is a chance of accident. If the pressure exceeds the desired range during filling of SF6, then the pressure relief device might get damaged and if the pressure is less than the desired pressure because of leakage in SF6 tank then there is a chance of dielectric failure inside the tank.
[0004] There is, therefore, a need of a system to monitor pressure level
inside tank of the gals insulated switchgear to take necessary steps before any damage to the switchgear.
OBJECTS OF THE PRESENT DISCLOSURE
[0005] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies are as listed herein below.
[0006] It is an object of the present disclosure to provide a system for
tripping a gas insulated switchgear in case of over pressure and under pressure
condition.

[0007] It is an object of the present disclosure to provide a system for
tripping a gas insulated switchgear, which is cost effective.
[0008] It is an object of the present disclosure to provide a system for
tripping a gas insulated switchgear, which is simple and easy to use.
[0009] It is an object of the present disclosure to provide a system for
tripping a gas insulated switchgear, which requires less maintenance cost.
SUMMARY
[0010] The present disclosure relates to the field of gas insulated
switchgear. More particularly the present disclosure relates to a system for tripping the vacuum circuit breaker of gas insulated switchgear in case of over pressure and under pressure condition.
[0011] An aspect of the present disclosure pertains to a system for tripping
a gas insulated switchgear. The system includes a first limit switch, a second limit
switch (not shown in Figs.). The first limit switch and the second limit switch are
operatively configured with a vacuum circuit breaker of the gas insulated
switchgear. A bellow gauge, operatively configured with the first limit switch and
the second limit switch, configured with a tank of the gas insulated switchgear.
When a pressure inside the tank increases a first threshold value, the bellow is
configured to inflate to press the first limit switch, and when the pressure inside
the tank falls below a second threshold value the bellow is configured to de-inflate
to press the second limit switch. When any of the first limit switch and the second
limit switch is pressed the vacuum circuit breaker is tripped.
[0012] In an aspect, the second threshold value may be lower than the first
threshold value.
[0013] In an aspect, the first limit switch, the second limit, may be
positioned with respect to the bellow such that the inflation and de-inflation of the bellow facilitates pressing of the first limit switch and the second limit switch, respectively.

[0014] In an aspect, pressing any of the first limit switch and the second
limit switch may facilitate shutting off electrical supply of the gas insulated
switchgear.
[0015] 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
[0016] 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.
[0017] 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.
[0018] FIG. 1A-B illustrates exemplary representation of when a bellow is
in deflated state, in accordance with an embodiment of the present disclosure.
[0019] FIG. 2 A-B illustrates exemplary representation of when a bellow is
in inflated state, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0020] 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.
[0021] 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.
[0022] The present disclosure relates to the field of gas insulated
switchgear. More particularly the present disclosure relates to a system for
tripping the vacuum circuit breaker of gas insulated switchgear in case of over
pressure and under pressure condition.
[0023] The present disclosure elaborates upon a system for tripping a gas
insulated switchgear. The system includes a first limit switch, a second limit
switch. The first limit switch and the second limit switch are operatively
configured with a vacuum circuit breaker of the gas insulated switchgear. A
bellow gauge, operatively configured with the first limit switch and the second
limit switch, configured with a tank of the gas insulated switchgear. When a
pressure inside the tank increases a first threshold value, the bellow is configured
to inflate to press the first limit switch, and when the pressure inside the tank falls
below a second threshold value the bellow is configured to de-inflate to press the
second limit switch. When any of the first limit switch and the second limit switch
is pressed the vacuum circuit breaker is tripped.
[0024] In an embodiment, the second threshold value can be lower than
the first threshold value.
[0025] In an embodiment, the first limit switch, the second limit, can be
positioned with respect to the bellow such that the inflation and de-inflation of the
bellow facilitates pressing of the first limit switch and the second limit switch,
respectively.

[0026] In an embodiment, pressing any of the first limit switch and the
second limit switch can facilitate shutting off electrical supply of the gas insulated switchgear.
[0027] FIG. 1A-B illustrates exemplary representation of when a bellow is
in deflated state, in accordance with an embodiment of the present disclosure.
[0028] FIG. 2A-B illustrates exemplary representation of when a bellow is
in inflated state, in accordance with an embodiment of the present disclosure.
[0029] As illustrated, a system 100 for tripping a gas insulated switchgear
can include a first switch 102, a second switch (not shown). The first switch and the second switch can include but not limited to a limit switch. The first limit switch 102 and the second limit switch can be operatively configured with a vacuum circuit breaker of the gas insulated switchgear. A bellow gauge 104 can be operatively configured with the first limit switch and the second limit switch. The bellow gauge 104 can be configured with a tank 200 of the gas insulated switchgear. The bellow gauge 104 (can also be referred as composite bellow gauge 104) can include an internal bellow 104-1 and an external bellow 104-2. The internal bellow 104-1 can act as a backup in case the external bellow 104-2 does not work. Position of the limit switches can be changed depending upon the requirement of tripping of VCB in a particular pressure range. One or more limit switches can be actuated through proposed arrangement. The system can be IP67 protected. The bellow gauge can work with most of the fluids and is not temperature compensated.
[0030] In an embodiment, when a pressure inside the tank increases a first
threshold value, the bellow gauge 104 can be configured to inflate to press the first limit switch 102 and the over pressure can be removed by using some extraction machine. When the pressure inside the tank falls below a second threshold value the bellow is configured to de-inflate to press the second limit switch. When any of the first limit switch and the second limit switch is pressed the vacuum circuit breaker can be tripped. The second threshold value can be lower than the first threshold value. The first limit switch 102, the second limit, can be positioned with respect to the bellow gauge 104 such that the inflation and

de-inflation of the bellow facilitates pressing of the first limit switch and the second limit switch, respectively.
[0031] In an embodiment, pressing any of the first limit switch and the
second limit switch can facilitate shutting off electrical supply of the gas insulated switchgear. The first limit switch and the second limit switch can be strategically positioned with respect to the bellow gauge 104 such that while inflation the first limit switch can be pressed, by the bellow 104, leading to tripping of the vacuum circuit breaker and while deflation the second limit switch can be pressed, by the bellow 104, leading to tripping of the vacuum circuit. In this way the proposed system can protect the gas insulated switchgear from damage in case of both an over pressure condition and an under-pressure condition inside the tank of the gas insulated switchgear.
[0032] 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, or 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.
[0033] 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
[0034] The proposed invention provides a system for tripping a gas
insulated switchgear in case of over pressure and under pressure condition.
[0035] The proposed invention provides a system for tripping a gas
insulated switchgear, which is cost effective.
[0036] The proposed invention provides a system for tripping a gas
insulated switchgear, which is simple and easy to use.
[0037] The proposed invention provides a system for tripping a gas
insulated switchgear, which requires less maintenance cost.

We Claim:

1. A system for tripping a gas insulated switchgear, the system comprising:
a first switch;
a second switch, wherein the first limit switch and the second limit switch are operatively configured with a vacuum circuit breaker of the gas insulated switchgear; and
a bellow gauge, operatively configured with the first switch and the second switch, configured with a tank of the gas insulated switchgear, and when a pressure inside the tank increases a first threshold value the bellow is configured to inflate to press the first switch, and when the pressure inside the tank falls below a second threshold value the bellow is configured to de-inflate to press the second switch, wherein when any of the first switch and the second switch is pressed the vacuum circuit breaker is tripped.
2. The system as claimed in claim 1, wherein the first switch and the second switch comprise a limit switch.
3. The system as claimed in claim 1, wherein the second threshold value is lower than the first threshold value.
4. The system as claimed in claim 1, wherein the first limit switch and the second limit are positioned with respect to the bellow such that the inflation and de-inflation of the bellow facilitates pressing of the first limit switch and the second limit switch, respectively.
5. The system as claimed in claim 1, wherein pressing any of the first limit switch and the second limit switch facilitate shutting off electrical supply of the gas insulated switchgear.