The present subject matter described herein, in general, relates to the field of switchgears, and more particularly to a type test compartment used in a gas insulated switchgear (GIS) for a type testing purpose.
BACKGROUND
Conventionally, to perform type testing in a GIS two Coupled panels are required i.e., two Panel for a particular Type test. One Panel is used as a Test object and other is used just as an Injection panel. Actual test is carried out on the panel considered as test object. Injection panel plays a supporting role. Depending upon Type Test, Injection Panel may be same as Test Panel or it may consist of only links, droppers, bus bar, and the like.
During a particular test, if an injection panel fails, the test is considered as fail, even if the testing panel has cleared the Test. It is required to curb down this issue and therefore the inventors of the present invention have felt a dire need to develop a compartment which will serve the purpose of injection panel but remain risk free, cost buster and transportation friendly.
For prior art, reference is made to a KR101123914B1 which discloses an encapsulated gas insulated switching installation. This prior art relates to polyphase switchgear installation which has gas filled modular encapsulation. The module can accommodate at least 1 Bus bar.
Thus, in view of the drawback of the prior art, there exists a dire need for a development of a Type Test Compartment which curbs down risk of failure of an injection panel in a gas insulated switchgear.

SUMMARY OF THE INVENTION:
This summary is provided to introduce a selection of concepts in a simplified format that is further described in the detailed description. This summary is not intended to identify key or essential inventive concepts.
An objective of the present invention is to provide a type test compartment used in a gas insulated switchgear for type testing purpose which curbs down risk of failure of Injection panel.
Accordingly, in one aspect, the present invention provides a type test compartment for a gas insulated switchgear unit for type testing purpose. The type test compartment comprising: a tank welded assembly having one or more internal components, wherein the door of the welded assembly sealed by means of bolted door using a plurality of silicone O-rings; wherein said welded assembly accommodate at least 3 busbars and at least 3 bushings for Type Testing purpose. The 3 busbars and bushing are used for 3 respective phases namely R, Y & B. Bushing serves the function of Electrical supply point or Injection Point. The welded assembly further comprises a L-shaped connecting link adapted to provide electrical coupling to between said busbars and said bushings.
In one implementation, the welded assembly is a steel tank welded assembly.
In one implementation, the steel tank welded assembly having a thickness of 3mm.
In one implementation, the at least 3 bushings serve as an electrical supply point or an inj ection Point.
In one implementation, the silicon O rings adapted to seal SF6 Gas in the compartment.

In one implementation, the type test compartment is mechanically coupled with a Test Panel.
By going for the arrangement described in the present invention, the type test compartment is totally unique and is used during type testing. The Type Test compartment comprises of uniquely designed Tank, Busbars, Bushing, Connecting Link, Support insulators etc. All these elements are designed in such a manner, so that min, Phase to Phase, Phase to Earth clearances/creepages are maintained. Also, the busbars, L shaped Connecting Links are designed with suitable current density which allows rated current to flow through them, without hampering the Temperature rise limits.
The above aspects and the advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
It is appreciated that the drawings provided in the present disclosure only illustrate application examples of the present disclosure and are therefore not to be construed as limiting its scope. The foregoing disclosure provides additional information with additional specificity and details with the accompanying drawings, which are listed below for quick reference.
Figure 1 shows the internal assembly of type test compartment coupled with of Gas Insulated Switchgear (Test Panel), according to one implementation of the present invention. Type test compartment consist of bus bar, connecting links, short bushings, support insulators as shown in figure 1.
Figure 2 shows Cable Assembly with type test compartment, according to one implementation of the present invention.

It may be noted that the one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding of the embodiments of the present disclosure, so as not to obscure the drawings with details that will be readily apparent to those of ordinary skilled in the art having benefit of the description herein.
DETAILED DESCRIPTION OF THE INVENTION
It should be understood at the outset that although illustrative implementations of the present disclosure are detailed below, the present invention may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should be in no way be construed as being limited to the illustrative implementations, drawings, and techniques, illustrated below, including the exemplary design and implementation illustrated and described herein, but may be modified within the scope of equivalents.
Unless otherwise defined, all terms and especially technical and/or scientific terms, used herein, may be taken to have the same meaning as commonly understood by one ordinarily skilled in the art.
Reference is made herein to some "embodiments". It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the claims. Some embodiments have been described for the purpose of illuminating one or more potential ways in which the specific features and/or elements of the foregoing claims fulfill the requirements of uniqueness, utility, and non-obviousness.
The present subject matter described herein, in general, relates to a type test compartment used in Gas Insulated Switchgear for Type Testing Purpose.

In one implementation, the type test compartment is basically the replacement of Injection Panel. This compartment is a Steel Tank welded assembly of typical thickness of 3mm consisting of various internal components. The door of the welded enclosure is then sealed with bolted door with the help of silicone O-rings. Once all the internal components of the switchgear are assembled inside the welded tank the door is closed and insulating gas is filled with certain amount of pressure required to maintain the specified insulation level inside the tank. Less components makes it easier to assemble/disassemble and also it makes it more reliable as compare to an injection panel as it contains less components. Also, the transportation of such arrangement is easier.
In one implement, reference is made to figure 1, which shows the internal assembly of type test compartment coupled with of Gas Insulated Switchgear (Test Panel), according to one implementation of the present invention. The type test compartment consists of bus bar, connecting links., short bushings., support insulators as shown in figure 1
In the implementation, the Type Test compartment is mechanically coupled with the Test Panel in the same way, as Injection Panel is Coupled. The Injection Panel was used to electrical couple Busbar of Test Panel to an injection bushing. Electrical supply while testing, was given to the injection bushing which was transferred to Busbar of Test Panel Via Injection Panel. The Type Test compartment all together replaces the Injection panel and the function of electrical coupling of Busbar and bushing is served by Busbars & L shaped Connecting link (as shown in the Figure.) The design of Busbars, Connection link and also the tank is unique and developed in such a way so that it maintains the min. phase to phase and phase to earth clearances and creepages. A round shaped busbar of variable diameter is mounted on the busbar block inside the GIS Panel, whereas in the Type Test compartment it is mounted on L shaped Connection link of variable cross-sectional size. Connection link is placed on support insulators to give the sufficient clearance from the Tank. The size of busbar, connection link,

support insulators and tank varies depending on voltage, current and short circuit rating of the Test Panel.
Reference is made to Figure 2 which shows Cable Assembly with type test compartment, according to one implementation of the present invention.
In one implementation, the parts and components as illustrated in the figures are listed as under:
1) Bus Bar
2) Connecting Links
3) Short Bushings
4) Support Insulators
5) Gas Insulated Switchgear (Test Panel).
6) Testing cables
7) Support Bracket
8) Main Bus Bar
9) O-Rings
10) Bushing Flange & Coupling Flange
In one implementation, gas Insulated Switchgear is the Test Panel on which various Type Test like Temperature Rise, Basic Insulation Level Test, Short Time Current Withstand Test etc. are performed. Support Brackets/ Insulators are used for maintaining min Phase to Phase and Phase to Earth Clearances/Creepages. The function of electrical coupling of Busbar and bushing is served by Busbars & L shaped Connecting link. Bushing and coupling flange with O-rings is used to seal SF6 Gas in the Type Test compartment. Bushing Flange is placed between Compartment Tank and Bushing, while the coupling flange is placed between Test panel and Compartment Tank, so that there is no leakage of SF6.
Some of the non-limiting advantages of the present invention are as follows:

WE CLAIM:

1. The compartment replaces costlier Injection panel.

2. Reduces risk of assembly errors in Injection Panel
3. The Assembly and Coupling of the type test compartment is More Convenient & Reliable.
4. Transportation and storage are easier and takes less space
Those skilled in the art will recognize other use cases, improvements, and modification to the embodiments of the present disclosure. All such improvements and other use-cases are considered within the scope of the concepts disclosed herein.

CLAIM :
1. A type test compartment for a gas insulated switchgear unit for type
testing purpose, wherein said type test compartment comprising:
a tank welded assembly having one or more internal components, wherein
the door of the welded assembly sealed by means of bolted door using a
plurality of silicone O-rings;
wherein said welded assembly accommodate at least 3 busbar means and
at least 3 bushing means for 3 R, Y and B phases, respectively, for Type
Testing purpose;
wherein said welded assembly further comprises a L-shaped connecting
link means adapted to provide electrical coupling to between said busbars
and said bushings.
2. The type test compartment as claimed in claim 1, wherein said welded assembly is a steel tank welded assembly.
3. The type test compartment as claimed in claim 2, wherein said steel tank welded assembly having a thickness of 3mm.
4. The type test compartment as claimed in the claim 1, wherein said at least 3 bushing means serves as an electrical supply point or an injection Point.
5. The type test compartment as claimed in the claim 1, wherein said silicon O ring means adapted to seal SF6 Gas in the compartment.

6. The type test compartment as claimed in any one of claims 1 to 5, is
mechanically coupled with a Test Panel.