Three-phase integrated GIS withstand voltage test tool

Abstract

The utility model relates to the technical field of GIS detection, and especially relates to a three-phase integrated GIS withstand voltage test tool. A top interface of the first transition shell is connected with a test sleeve, and a sleeve conductor in the test sleeve is connected with a first transition conductor in the first transition shell; the bottom of the first transition shell is provided with three interfaces which are respectively connected with a tapping shell, the bottom ends of the three tapping shells are connected with a top interface of a second transition shell, the second transition shell is internally provided with a three-phase second transition conductor which extends axially, and the second transition conductor extends to the end part of the second transition shell and is used for being connected with a test article; the three tapping shells are respectively provided with an isolating switch, a grounding switch, a first movable conductor and a second movable conductor, wherein the first movable conductor and the second movable conductor are controlled by the isolating switch and the grounding switch. According to the utility model, the isolating switch and the grounding switch are additionally arranged on the three-phase voltage boosting loop, and the isolating switch and the grounding switch of the three-phase voltage boosting loop can be respectively operated to be switched on and off, so that single-phase voltage boosting and three-phase simultaneous voltage boosting can be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of GIS detection, in particular to a three-phase integrated GIS pressure resistance test tool. Background Art

[0002] With the vigorous promotion of high-voltage GIS projects, the quality requirements for GIS equipment are getting higher and higher. GIS equipment needs to undergo a withstand voltage test before leaving the factory to test whether its performance meets the standards. Only qualified GIS equipment can be installed in the factory. Depending on the type of GIS product busbar, there can be different withstand voltage test devices. There are devices that can only perform single-phase pressure tests, and there are also devices that can simultaneously connect to three-phase split GIS busbars and perform three-phase withstand voltage tests. For example, CN109406970A, a three-phase integrated withstand voltage test device for GIS, provides a test device with three interfaces that can simultaneously connect to three-phase split GIS busbars, realizing the three-phase live withstand voltage test of GIS equipment. However, most of the 220kV GIS product busbars are now three-phase integrated, and the above three-phase withstand voltage test device cannot be applied. The withstand voltage test for this busbar is currently connected to the GIS product circuit breaker body for connection, and there is no dedicated withstand voltage test device, which increases the possibility of the GIS body being broken down by voltage. Summary of the invention

[0003] In view of the above problems, the utility model provides a special test equipment for the three-phase integrated GIS voltage withstand test. The equipment only needs one test sleeve to realize the ABC three-phase pressure test of the three-phase integrated GIS busbar and the body, thereby reducing the time waste caused by excessive docking and improving the test efficiency.

[0004] The specific scheme of the utility model is as follows:

[0005] A three-phase integrated GIS withstand voltage test tool comprises a voltage equalizing ring, a test sleeve and a first transition shell, wherein the top interface of the first transition shell is connected to the test sleeve, and the sleeve conductor in the test sleeve is connected to the first transition conductor in the first transition shell; three interfaces are arranged at the bottom of the first transition shell, each of which is connected to a tap shell, and the bottom ends of the three tap shells are connected to the top interface of the second transition shell; an axially extending three-phase second transition conductor is arranged in the second transition shell, and the second transition conductor extends to the end of the second transition shell for connecting a test product; the three tap shells are all provided with an isolating switch, a grounding switch and a first movable conductor and a second movable conductor controlled by the isolating switch and the grounding switch, for controlling the on / off or grounding of the test product and the gas transformer.

[0006] Furthermore, single-phase pot-type insulators are provided at the connection points between the two ends of the tap housing and the first transition housing and the second transition housing, the first transition conductor is connected to the upper side of the single-phase pot-type insulator at the upper end, and the three second transition conductors are respectively connected to the lower sides of the single-phase pot-type insulators at the lower ends of the three tap housings. The pot-type insulator connection can ensure insulation and facilitate the connection of each conductor.

[0007] Furthermore, the inner sides of the single-phase pot-type insulators at both ends of the tap housing are respectively connected to a first connecting conductor and a second connecting conductor. The first connecting conductor is provided with a cavity for accommodating a first movable conductor and a slot for inserting and swinging an isolating switch operating head. The end of the isolating switch operating head is hinged to the first movable conductor, and is used to pull the first movable conductor up and down to connect or disconnect it with the second connecting conductor; the end of the grounding switch operating head is hinged to the second movable conductor, and is used to push the second movable conductor left and right to connect or disconnect it with the second connecting conductor. When a withstand voltage test needs to be performed on a certain phase separately, the isolating switch on that road can be closed to conduct the circuit, and the grounding switch can be disconnected at the same time. For other circuits that do not require pressurization, the grounding switch can be closed and the isolating switch can be disconnected to ground other circuits of the test product that do not need to be tested.

[0008] Furthermore, three-phase pot-type insulators are provided at both ends of the second transition shell, and the ends of the three-phase second transition conductors are inserted into the three-phase pot-type insulators at both ends. One of the three-phase pot-type insulators is used to connect the test product, so that the test product and the test tooling can be quickly disassembled and assembled.

[0009] Furthermore, the first transition housing and the second transition housing are provided with at least four interfaces. Preferably, the first transition housing uses a three-phase seven-way housing, and the second transition housing uses a three-phase five-way housing. Unused interfaces are closed with end covers.

[0010] Beneficial effects of the utility model:

[0011] 1. The utility model is a further improvement on the original three-phase integrated withstand voltage test equipment, and an isolating switch and a grounding switch are added to the A, B, and C three-phase pressurization circuits. The isolating switch and the grounding switch of the three-phase pressurization circuit can be operated separately, so that both single-phase pressurization and three-phase simultaneous pressurization can be performed.

[0012] 2. The utility model does not need to connect the branch bus. After the pressurized circuit is separated into three groups of switch control circuits, the circuits of each phase are integrated into a docking port through a second transition shell with a three-phase conductor inside. It only needs to be docked with the test product once to carry out a single-phase or three-phase pressurized test, which reduces the number of docking times and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front sectional view of the utility model;

[0014] Figure 2 It is a partial cross-sectional view of the tap housing when the isolating switch is closed and the earthing switch is open;

[0015] Figure 3 It is a partial cross-sectional view of the tap housing when the isolating switch is open and the earthing switch is closed;

[0016] In the figure, 1. voltage-grading ring, 2. test bushing, 3. bushing conductor, 4. first transition shell, 5. first transition conductor, 6. single-phase pot-type insulator, 7. tap shell, 8. first connecting conductor, 9. first movable conductor, 10. second movable conductor, 11. disconnector, 12. earthing switch, 13. second connecting conductor, 14. connector, 15. second transition conductor, 16. second transition shell, 17. three-phase pot-type insulator, 18. end cover. DETAILED DESCRIPTION

[0017] The structure of the utility model is described in detail below with reference to the accompanying drawings.

[0018] A three-phase integrated GIS pressure test tool, such as Figure 1 As shown, it includes a first transition shell 4, which adopts a three-phase seven-way shell. An interface at the top of the first transition shell 4 is connected to the bottom end of the test bushing 2, and a grading ring 1 is installed at the top of the test bushing 2. A first transition conductor 5 is arranged in the first transition shell 4, and the top of the first transition conductor 5 is connected to the bottom end of the bushing conductor 3. The three interfaces at the bottom of the first transition conductor 5 are respectively connected to three tap shells 7 through single-phase pot insulators 6, and the three connectors at the bottom of the first transition conductor are respectively plugged into the upper side of the upper single-phase pot insulator. The other interfaces of the first transition shell are closed with end covers. It also includes a second transition shell 16, which adopts a three-phase five-way shell, and a second transition conductor 15 corresponding to the A phase, the B phase, and the C phase is axially arranged therein. The three interfaces at the top of the second transition shell 16 are connected to the bottom end of the tap shell 7 through the single-phase pot insulator 6. The second transition conductor 15 is provided with upwardly extending connectors 14 corresponding to the top three interface positions, which are respectively plugged into the lower side of the single-phase pot insulator at the lower end of the tap shell. A three-phase pot insulator 17 is installed at each end of the second transition housing 16, and the left end is closed with an end cover 18. The three-phase pot insulator at the right end is used as a test product butt joint for connecting the test product. The arrangement of the three second transition conductors corresponds to the plug connector on the three-phase pot insulator and is plugged into the three-phase pot insulator.

[0019] like Figure 2 , 3As shown, each tap housing 7 is provided with a set of isolating switches 11 and grounding switches 12, which are used to control the conduction or grounding of each phase pressurized circuit. Among them, the tap housing 7 is provided with a first connecting conductor 8, a first movable conductor 9 and a second connecting conductor 13 from top to bottom. The top of the first connecting conductor 8 is connected to the lower side of the single-phase pot-type insulator at the upper end, and the bottom of the second connecting conductor 13 is connected to the upper side of the single-phase pot-type insulator at the lower end. The isolating switch 11 is located on the upper side of the tap housing, and the side wall of the tap housing has a hole for the operating head of the isolating switch to be inserted. The first connecting conductor 8 is provided with a cavity that can accommodate the up and down movement of the first movable conductor, and the side is grooved for the operating head of the isolating switch to swing. The end of the operating head of the isolating switch 11 is hinged with the first movable conductor 9. The top of the second connecting conductor 13 is provided with a hole for the first movable conductor to be inserted. The operating head of the isolating switch pulls the first movable conductor up and down to connect or disconnect with the second connecting conductor, thereby making the pressurized circuit in which it is located conductive or disconnected. The grounding switch 12 is located at one side of the lower part of the tap housing. The operating head end of the grounding switch 12 is hinged to the second movable conductor 10. The side wall of the tap housing has a hole for the second movable conductor to be inserted. The second connecting conductor has a hole at a position corresponding to the second movable conductor for the second movable conductor to be inserted and connected. After the second movable conductor is inserted into the second connecting conductor, the connected phase GIS circuit to be tested can be grounded without performing a withstand voltage test, and high voltage breakdown of the equipment can be avoided.

[0020] Figure 2 The figure shows the state where the isolating switch is closed and the earthing switch is disconnected, at which time the first movable conductor is in contact with the second connecting conductor and the pressurized circuit is turned on; Figure 3 The isolating switch is open and the grounding switch is closed. At this time, the first movable conductor is separated from the second connecting conductor, the pressurized circuit is disconnected, the second movable conductor is in contact with the second connecting conductor, and the circuit is grounded.

[0021] The use process of the utility model is as follows: when conducting a withstand voltage test on the GIS main bus or main equipment, connect the main bus or main equipment to the test fixture interface, and connect the gas transformer and the test bushing through a high-voltage lead. When it is necessary to conduct a withstand voltage test on phase A, phase B or phase C separately, refer to the following table to control the opening and closing of each isolating switch and grounding switch, and control the on and off of the corresponding pressurized circuit. When it is necessary to conduct a withstand voltage test on three phases at the same time, close the three-phase isolating switch at the same time and disconnect the grounding switch.

[0022]

Claims

1. A three-phase integrated GIS withstand voltage test tool, comprising a grading ring, a test bushing and a first transition shell, wherein the top interface of the first transition shell is connected to the test bushing, and the bushing conductor in the test bushing is connected to the first transition conductor in the first transition shell; characterized in that: The bottom of the first transition shell is provided with three interfaces, which are respectively connected to a tap shell. The bottom ends of the three tap shells are connected to the top interface of the second transition shell. An axially extending three-phase second transition conductor is provided in the second transition shell. The second transition conductor extends to the end of the second transition shell and is used to connect the test product. The three tap shells are all provided with an isolating switch, a grounding switch and a first movable conductor and a second movable conductor controlled by the isolating switch and the grounding switch, which are used to control the on / off or grounding of the test product and the gas transformer.

2. The three-phase integrated GIS withstand voltage test tool according to claim 1 is characterized in that: Single-phase pot-type insulators are provided at the connection points between the two ends of the tap housing and the first transition housing and the second transition housing. The first transition conductor is connected to the upper side of the single-phase pot-type insulator at the upper end, and the three second transition conductors are respectively connected to the lower sides of the single-phase pot-type insulators at the lower ends of the three tap housings.

3. The three-phase integrated GIS withstand voltage test tool according to claim 2 is characterized in that: The inner sides of the single-phase pot-type insulators at both ends of the tap housing are respectively connected to a first connecting conductor and a second connecting conductor. The first connecting conductor is provided with a cavity for accommodating a first movable conductor and a groove for inserting and swinging an operating head of an isolating switch. The end of the operating head of the isolating switch is hinged to the first movable conductor and is used to pull the first movable conductor up and down to connect or disconnect it with the second connecting conductor; the end of the operating head of the grounding switch is hinged to the second movable conductor and is used to push the second movable conductor left and right to connect or disconnect it with the second connecting conductor.

4. The three-phase integrated GIS withstand voltage test tool according to claim 1 is characterized in that: Three-phase pot-type insulators are provided at both ends of the second transition housing, and the ends of the three-phase second transition conductors are inserted into the three-phase pot-type insulators at both ends, and one of the three-phase pot-type insulators is used to connect the test product.

5. The three-phase integrated GIS withstand voltage test tool according to any one of claims 1 to 4, characterized in that: The first transition shell and the second transition shell are provided with at least four interfaces.

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