Combined insulation test tool for GIS (Gas Insulated Switchgear) equipment

Abstract

The utility model relates to the technical field of power equipment, in particular to a GIS equipment combined insulation test tool, which comprises a product I, a product II, a product III, a variable-diameter tank I, a straight bus module I, a T-shaped tank, a straight bus module III, an isolation grounding switch module I, an isolation grounding switch module II and a variable-diameter tank II. According to the insulation test tool, the insulation test time can be shortened; the working time of a single-phase sample is reduced; the personnel cost is reduced and the personnel utilization efficiency is improved; energy loss is reduced, and economic benefits are improved; and emission of SF6 greenhouse gas is reduced, and certain environmental protection significance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to a GIS equipment combined insulation test tool. Background Art

[0002] The factory insulation test of GIS equipment during the production stage in the factory is one of the important items for evaluating equipment. The factory insulation test includes lightning impulse test and power frequency withstand voltage test. The lightning impulse setting value of 550kV GIS products is 1675±3% kV, and the positive and negative electrodes are each impacted 3 times. The power frequency withstand voltage setting value is 740kV, and the voltage is stabilized for 1 minute. There must be no breakdown discharge failure in the two tests. Two types of test equipment are required for the two insulation tests. At the same time, the product equipment and tooling need to be filled with 0.5MPa (5 atmospheres) of SF6 gas. The original test mode is to first connect the product to the lightning impulse transformer equipment, fix it with 24 M16 bolts, evacuate the air chamber to below 50pa, and inflate it to 0.5MPa. After the lightning impulse test, the SF6 gas is recovered, evacuated, and released to atmospheric pressure, and the GIS product is removed from the withstand voltage equipment. It is connected to the withstand voltage transformer and fixed with 24 M16 bolts. The air chamber is evacuated to below 50pa and inflated to 0.5MPa. The two sets of tests take about 7 hours. The production workshop often uses a shift system to complete the output, which is time-consuming and has low production efficiency. Therefore, those skilled in the art provide a GIS equipment joint insulation test tool to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a GIS equipment joint insulation test tool, including product one, product two, product three, reducer tank one, straight bus module one, T-shaped tank, straight bus module three, isolation grounding switch module one, isolation grounding switch module two and reducer tank two;

[0004] One end of product 1, product 2 and product 3 are all connected to reducer tank 1, one side of reducer tank 1 is provided with straight bus module 1, one side of straight bus module 1 is provided with straight bus module 2, one side of straight bus module 2 is provided with isolating grounding switch module 1, multiple isolating grounding switch modules 1 are all connected to T-shaped tank, and two isolating grounding switch modules 2 are provided on the side of T-shaped tank away from isolating grounding switch module 1, one of isolating grounding switch modules 2 is connected to lightning impulse transformer through reducer tank 2, and the other isolating grounding switch module 2 is connected to power frequency withstand voltage transformer through reducer tank 2;

[0005] Three-way busbar modules are provided at positions corresponding to the isolating and grounding switch module 1 and the isolating and grounding switch module 2 in the T-shaped tank, and the three-way busbar module between the product 2 and the product 1 is connected through the straight busbar module 3;

[0006] Both ends of the T-shaped tank are set as terminal tanks, and the terminal tank, the second reducer tank, the first straight busbar module, and the second straight busbar module are all equipped with combination valve modules;

[0007] The straight busbar module 1, the straight busbar module 2, the isolating and earthing switch module 1, the adjacent three-way busbar modules, and the isolating and earthing switch module 2 and the reducer tank 2 are all separated by insulating basins.

[0008] Preferably, the isolating and grounding switch module 1 and the isolating and grounding switch module 2 have the same structure, and both include an isolating switch and a grounding switch.

[0009] Preferably: the isolating switch comprises an electric operating mechanism, a transmission shaft, a shaft seal, an insulating pull rod, a gear, a rack, a spring contact finger, a moving contact, and a stationary contact, and a shielding cover is arranged outside the metal conductive parts for protection.

[0010] Preferably: the grounding switch comprises an electric operating mechanism, a transmission shaft, a shaft seal, a crank arm, a guide frame, a spring contact finger, a moving contact, a static contact, and a shielding cover is provided on the moving contact seat; the grounding switch is connected to the grounding grid through a housing and a grounding wire.

[0011] Preferably: the reducer tank 1 is an 800kV to 550kV reducer tank, the reducer tank 2 is a 1000kV to 800kV reducer tank, the conductive circuits inside the reducer tank 1 and the reducer tank 2 are connected to the contact through a tubular conductor, and spring contact fingers and a shielding cover are arranged inside the contact.

[0012] Preferably: the three-way busbar module includes a supporting conductor, a contact, a contact seat, and a shielding cover.

[0013] Preferably: the straight busbar module 1 and the straight busbar module 2 have the same structure, both comprising a straight busbar tank body, inside of which are: conductors and contacts; the straight busbar module 2 uses a short straight busbar.

[0014] Preferably: the insulating basin is cast from epoxy resin, with a conductor embedded in the middle, a silver-plated surface connected to a contact or conductor, and a metal aluminum flange at the edge.

[0015] Preferably: the combination valve module is composed of a combination valve and a pressure gauge, and the combination valve is composed of a switch handle and a check valve, which is installed on the tank body and connected to the air chamber.

[0016] Preferably: the terminal tank is composed of a terminal shell and a tail ball shielding cover.

[0017] Technical effects and advantages of the utility model:

[0018] (1) The original single-phase insulation test, lightning impulse and power frequency withstand voltage took about 7 hours. This tooling connects the impulse transformer and the withstand voltage transformer together through the isolating switch and the three-way busbar tooling. Through the multiple isolating switch switching mode, there is no need to disassemble and assemble the insulation test equipment for the second time and to pump and fill SF6 gas for the second time. The insulation test time can be shortened to 4 hours, reducing 3 hours, greatly shortening the insulation test time;

[0019] (2) Three test pieces can be connected, vacuumed and inflated at the same time, reducing the working hours of single-phase test pieces;

[0020] (3) Reduce the docking operation of a test product, reduce the workload of employees, reduce personnel costs, and improve personnel utilization efficiency;

[0021] (4) Reduce the number of times equipment (cranes, vacuum pumps, gas stations) are used, reduce energy loss, and improve economic benefits;

[0022] (5) Reducing primary SF6 gas treatment also reduces SF6 greenhouse gas emissions, which has certain environmental significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the GIS equipment joint insulation test tooling;

[0024] Figure 2 This is a schematic diagram of the state of the gas chamber of the GIS equipment joint insulation test tooling, taking the diagram of product 2 as an example;

[0025] Figure 3 This is the secondary schematic diagram of lightning impulse of the product in the GIS equipment joint insulation test tooling;

[0026] Figure 4 This is the secondary schematic diagram of the power frequency withstand voltage of the product in the GIS equipment joint insulation test tooling;

[0027] Figure 5 This is the secondary schematic diagram of the second lightning impulse of the product in the GIS equipment joint insulation test tooling;

[0028] Figure 6 This is the secondary schematic diagram of the second power frequency withstand voltage of the product in the GIS equipment joint insulation test tooling;

[0029] Figure 7 This is the secondary schematic diagram of three lightning impulses in the GIS equipment joint insulation test tooling;

[0030] Figure 8 This is the secondary schematic diagram of the three-power-frequency withstand voltage of the products in the GIS equipment joint insulation test tooling.

[0031] In the figure:

[0032] 1. Product 1; 2. Product 2; 3. Product 3; 4. Variable diameter tank 1; 5. Straight bus module 1; 6. Straight bus module 2; 7. Isolating and earthing switch module 1; 8. T-shaped tank; 9. Three-way bus module; 10. Isolating and earthing switch module 2; 11. Variable diameter tank 2; 12. Straight bus module 3; 13. Terminal tank; 14. Combination valve module; 15. Insulating basin; 16. Lightning impulse transformer; 17. Power frequency withstand voltage transformer; 18. Vacuum chamber; 19. Semi-pressure chamber; 20. Rated pressure chamber. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0034] Example

[0035] In this embodiment, a GIS equipment joint insulation test tool is provided, such as Figure 1 As shown, it includes product one 1, product two 2, product three 3, reducer tank one 4, straight bus module one 5, T-shaped tank 8, straight bus module three 12, isolation grounding switch module one 7, isolation grounding switch module two 10 and reducer tank two 11 and other structures, and its specific structural connection is as follows:

[0036] One end of product 1, product 2, and product 3 are all connected to reducer tank 14, one side of reducer tank 4 is provided with straight bus module 15, one side of straight bus module 15 is provided with straight bus module 26, one side of straight bus module 26 is provided with isolating grounding switch module 17, multiple isolating grounding switch modules 17 are all connected to T-shaped tank 8, and two isolating grounding switch modules 2 10 are provided on the side of T-shaped tank 8 away from isolating grounding switch module 17, one of isolating grounding switch modules 2 10 is connected to lightning impulse transformer 16 through reducer tank 2 11, and the other isolating grounding switch module 2 10 is connected to power frequency withstand voltage transformer 17 through reducer tank 2 11;

[0037] A three-way bus module 9 is provided in the T-shaped tank 8 at positions corresponding to the isolating and grounding switch module 1 7 and the isolating and grounding switch module 2 10, and the three-way bus module 9 between the product 2 2 and the product 1 1 is connected via a straight bus module 3 12;

[0038] Both ends of the T-shaped tank 8 are set as terminal tanks 13, and the terminal tank 13, the second reducer tank 11, the straight busbar module 1 5, and the straight busbar module 2 6 are all installed with a combination valve module 14;

[0039] It is worth noting that the straight busbar module 1 5, the straight busbar module 2 6, the isolating and grounding switch module 1 7, the adjacent three-way busbar modules 9, and the isolating and grounding switch module 2 10 and the reducer tank 2 11 are all separated by an insulating basin 15;

[0040] Specifically, the isolating and grounding switch module 1 7 and the isolating and grounding switch module 2 10 have the same structure, both of which include an isolating switch and a grounding switch. The two switches can be switched on and off by an electric operating mechanism. Among them, the isolating switch is mainly used to connect and disconnect the main conductive circuit, and the grounding switch is mainly used to ground the non-live part of the main circuit to protect other equipment. At the same time, the floating potential is eliminated by grounding. The control and motor voltage of the operating mechanism is AC220V;

[0041] The main components of the disconnector include electric operating mechanism, transmission shaft, shaft seal, insulating pull rod, gear, rack, spring contact finger, moving contact, static contact, etc. The metal conductive parts are protected by a shielding cover to make the electric field uniform and ensure the insulation strength. The disconnector is opened and closed through the electric operating mechanism to realize the conduction and disconnection of the main conductive circuit.

[0042] The main components of the grounding switch include electric operating mechanism, transmission shaft, shaft seal, crank arm, guide frame, spring contact finger, moving contact, static contact, etc. The moving contact seat is provided with a shielding cover; the grounding switch is opened and closed through the electric operating mechanism, and the grounding switch is connected to the grounding grid through the housing and the grounding wire to realize the grounding protection function of the equipment;

[0043] Reducer tank 1 4 is a reducer from 800kV to 550kV, while reducer tank 2 11 is a reducer from 1000kV to 800kV. Due to the high voltage level of the transformer, the interface needs to be converted. At the same time, high voltage level equipment is used to perform insulation tests on relatively low voltage level equipment, which can reduce the discharge rate. The 1000kV transformer interface is converted into an 800kV interface; the 800kV interface is converted into a 550kV interface, and the 550kV interface is connected to the product. The internal conductive circuit is connected to the contact through a tubular conductor, and a spring contact finger and a shielding cover are set in the contact.

[0044] The three-way bus module 9 includes a supporting conductor, a contact, a contact seat, and a shielding cover to realize the three-way function. The straight bus module 1 5 and the straight bus module 2 6 have the same structure, both including a straight bus tank, inside which there are: conductors and contacts to realize the two-way function; the straight bus module 2 6 adopts a short straight bus and a small air chamber. When the product equipment is docked, the adjacent air chamber needs to recover the gas to a half-pressure state (i.e., 0.2MPa, 2 atmospheres) to prevent the insulating basin 15 from exploding. The small air chamber can shorten the operation time of recovering SF6 gas to half-pressure 0.2Mpa and inflating to the rated pressure 0.5Mpa;

[0045] The insulating basin 15 is cast from epoxy resin, and serves to separate the air chamber and support the main conductive circuit. The conductor is embedded in the middle, and the surface is silver-plated, and is connected to the contact or conductor to conduct electricity. The edge is a metal aluminum flange, which conducts the inductive current of the shell.

[0046] The combination valve module 14 is composed of a combination valve and a pressure gauge. The combination valve is mainly composed of a switch handle and a check valve. It is installed on the tank body and is connected to the gas chamber to realize vacuuming and gas filling of the gas chamber. The pressure gauge can occasionally display the pressure of SF6 gas in the gas chamber to ensure safe operation.

[0047] The terminal tank 13 is composed of a terminal shell and a tail ball shielding cover, which realizes a uniform electric field and plays the role of a terminal cover.

[0048] like Figure 2 As shown, taking product 2 as an example, the other two phases are connected in the same way as this phase. The reducer 14, straight busbar module 15, and straight busbar module 26 are respectively provided with a vacuum chamber 18, a half-pressure chamber 19, and a rated pressure chamber 20. The SF6 chamber of the straight busbar tooling adjacent to the interface is reduced by half pressure (i.e. 0.02MPa). The product is docked on the tooling, and the interface chamber, i.e. the test product, is vacuumed and filled with SF6 gas to the rated pressure, and the half-pressure chamber is filled with SF6 gas to the rated pressure. After the chamber treatment is completed, the insulation test is carried out.

[0049] Product 1 Lightning impulse test, secondary schematic diagram see Figure 3 , the isolating and grounding switch module 2 10 on one side of the lightning impulse transformer 16: isolation 1.1 is closed, and grounding 1.2 is opened; the isolating and grounding switch module 2 10 on one side of the power frequency withstand voltage transformer 17: isolation 2.1 is opened, and grounding 2.2 is closed; the isolating and grounding switch module 17 on one side of the product 1: isolation 5.1 is closed, and grounding 5.2 is opened; the isolating and grounding switch module 17 on one side of the product 2: isolation 6.1 is opened, and grounding 6.2 is closed; the isolating and grounding switch module 17 on one side of the product 3: isolation 7.1 is opened, and grounding 7.2 is closed.

[0050] Product 1 Power frequency withstand voltage test, secondary schematic diagram see Figure 4, the isolating and grounding switch module 2 10 on the side of the lightning impulse transformer 16: isolation 1.1 is opened, and grounding 1.2 is closed; the isolating and grounding switch module 2 10 on the side of the power frequency withstand voltage transformer 17: isolation 2.1 is closed, and grounding 2.2 is opened; the isolating and grounding switch module 17 on the side of the product 1: isolation 5.1 is closed, and grounding 5.2 is opened; the isolating and grounding switch module 17 on the side of the product 2: isolation 6.1 is opened, and grounding 6.2 is closed; the isolating and grounding switch module 17 on the side of the product 3: isolation 7.1 is opened, and grounding 7.2 is closed.

[0051] Product II 2 Lightning impulse test, secondary schematic diagram see Figure 5 , the isolating and grounding switch module 2 10 on one side of the lightning impulse transformer 16: isolation 1.1 is closed, and grounding 1.2 is opened; the isolating and grounding switch module 2 10 on one side of the power frequency withstand voltage transformer 17: isolation 2.1 is opened, and grounding 2.2 is closed; the isolating and grounding switch module 17 on one side of the product 1: isolation 5.1 is opened, and grounding 5.2 is closed; the isolating and grounding switch module 17 on one side of the product 2: isolation 6.1 is closed, and grounding 6.2 is opened; the isolating and grounding switch module 17 on one side of the product 3: isolation 7.1 is opened, and grounding 7.2 is closed.

[0052] Product 22 power frequency withstand voltage test, secondary schematic diagram see Figure 6 , the isolating and grounding switch module 2 10 on the side of the lightning impulse transformer 16: isolation 1.1 is opened, and grounding 1.2 is closed; the isolating and grounding switch module 2 10 on the side of the power frequency withstand voltage transformer 17: isolation 2.1 is closed, and grounding 2.2 is opened; the isolating and grounding switch module 17 on the side of the product 1: isolation 5.1 is opened, and grounding 5.2 is closed; the isolating and grounding switch module 17 on the side of the product 2: isolation 6.1 is closed, and grounding 6.2 is opened; the isolating and grounding switch module 17 on the side of the product 3: isolation 7.1 is opened, and grounding 7.2 is closed.

[0053] Product 33 Lightning impulse test, secondary schematic diagram see Figure 7 , the isolating and grounding switch module 2 10 on one side of the lightning impulse transformer 16: isolation 1.1 is closed, and grounding 1.2 is opened; the isolating and grounding switch module 2 10 on one side of the power frequency withstand voltage transformer 17: isolation 2.1 is opened, and grounding 2.2 is closed; the isolating and grounding switch module 17 on one side of the product 1: isolation 5.1 is opened, and grounding 5.2 is closed; the isolating and grounding switch module 17 on one side of the product 2: isolation 6.1 is opened, and grounding 6.2 is closed; the isolating and grounding switch module 17 on one side of the product 3: isolation 7.1 is closed, and grounding 7.2 is opened.

[0054] Product 3 3 Power frequency withstand voltage test, secondary schematic diagram see Figure 8, the isolating and grounding switch module 2 10 on the side of the lightning impulse transformer 16: isolation 1.1 is opened, and grounding 1.2 is closed; the isolating and grounding switch module 2 10 on the side of the power frequency withstand voltage transformer 17: isolation 2.1 is closed, and grounding 2.2 is opened; the isolating and grounding switch module 17 on the side of the product 1: isolation 5.1 is opened, and grounding 5.2 is closed; the isolating and grounding switch module 17 on the side of the product 2: isolation 6.1 is opened, and grounding 6.2 is closed; the isolating and grounding switch module 17 on the side of the product 3: isolation 7.1 is closed, and grounding 7.2 is opened.

[0055] After the test, the SF6 gas in the product gas chamber and the docking gas chamber is recovered and evacuated to atmospheric pressure. The pressure in the adjacent gas chamber of the docking interface is reduced by half, the test product is removed, and a new test product is docked for insulation test.

[0056] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. GIS equipment joint insulation test tool, characterized by: Including product one (1), product two (2), product three (3), reducer tank one (4), straight busbar module one (5), T-shaped tank (8), straight busbar module three (12), isolating and earthing switch module one (7), isolating and earthing switch module two (10) and reducer tank two (11); One end of product one (1), product two (2) and product three (3) are all connected to reducer tank one (4), one side of reducer tank one (4) is provided with straight bus module one (5), one side of straight bus module one (5) is provided with straight bus module two (6), one side of straight bus module two (6) is provided with isolating grounding switch module one (7), multiple isolating grounding switch modules one (7) are all connected to T-shaped tank (8), and two isolating grounding switch modules two (10) are provided on the side of T-shaped tank (8) away from isolating grounding switch module one (7), one isolating grounding switch module two (10) is connected to lightning impulse transformer (16) through reducer tank two (11), and the other isolating grounding switch module two (10) is connected to power frequency withstand voltage transformer (17) through reducer tank two (11); A three-way busbar module (9) is provided at positions corresponding to the isolating and grounding switch module 1 (7) and the isolating and grounding switch module 2 (10) in the T-shaped tank (8), and the three-way busbar module (9) between the product 2 (2) and the product 1 (1) is connected via a straight busbar module 3 (12); Both ends of the T-shaped tank (8) are arranged as terminal tanks (13), and a combination valve module (14) is installed on the terminal tank (13), the second reducer tank (11), the first straight busbar module (5), and the second straight busbar module (6); The straight busbar module 1 (5), the straight busbar module 2 (6), the isolating and grounding switch module 1 (7), the adjacent three-way busbar modules (9), and the isolating and grounding switch module 2 (10) and the reducer tank 2 (11) are all separated by an insulating basin (15).

2. The GIS equipment joint insulation test tool according to claim 1 is characterized in that: The isolating and grounding switch module 1 (7) and the isolating and grounding switch module 2 (10) have the same structure, and both include an isolating switch and a grounding switch.

3. The GIS equipment joint insulation test tool according to claim 2 is characterized in that: The isolating switch comprises an electric operating mechanism, a transmission shaft, a shaft seal, an insulating pull rod, a gear, a rack, a spring contact finger, a moving contact, and a stationary contact. A shielding cover is arranged outside the metal conductive parts for protection.

4. The GIS equipment joint insulation test tool according to claim 2 is characterized in that: The grounding switch comprises an electric operating mechanism, a transmission shaft, a shaft seal, a crank arm, a guide frame, a spring contact finger, a moving contact, a static contact, and a shielding cover is arranged on the moving contact seat; the grounding switch is connected to the grounding grid through a housing and a grounding wire.

5. The GIS equipment joint insulation test tool according to claim 1 is characterized in that: The reducer tank 1 (4) is a reducer tank for converting 800kV to 550kV, and the reducer tank 2 (11) is a reducer tank for converting 1000kV to 800kV. The conductive circuits inside the reducer tank 1 (4) and the reducer tank 2 (11) are connected through tubular conductors and contacts, and spring contact fingers and shielding covers are arranged inside the contacts.

6. The GIS equipment joint insulation test tool according to claim 1 is characterized in that: The three-way busbar module (9) comprises a supporting conductor, a contact, a contact seat and a shielding cover.

7. The GIS equipment joint insulation test tool according to claim 1 is characterized in that: The straight busbar module 1 (5) and the straight busbar module 2 (6) have the same structure, both comprising a straight busbar tank body, inside of which are: conductors and contacts; the straight busbar module 2 (6) uses a short straight busbar.

8. The GIS equipment joint insulation test tool according to claim 1 is characterized in that: The insulating basin (15) is cast from epoxy resin, with a conductor embedded in the middle, silver-plated on the surface, connected to the contact or conductor, and with a metal aluminum flange on the edge.

9. The GIS equipment joint insulation test tool according to claim 1, characterized in that: The combination valve module (14) is composed of a combination valve and a pressure gauge; the combination valve is composed of a switch handle and a check valve, is installed on the tank body, and is connected to the air chamber.

10. The GIS equipment joint insulation test tool according to claim 1, characterized in that: The terminal tank (13) is composed of a terminal shell and a tail ball shielding cover.

Images