CN205786928U - It is connected the cover plate assay device of air chamber with GIS for oil-gas type transformator - Google Patents

Abstract

The utility model provides a cover plate test device for connecting an oil-gas transformer and a GIS gas chamber, which includes an insulating plate fixedly connected to the connecting gas chamber and a bellows fixed on the insulating plate inside the connecting gas chamber. Positioning pins are arranged on the insulating plate to fix the conductive rod for the dynamic test. The bellows are fixedly connected with the conductive rod for the dynamic test. The conductive rod for the dynamic test passes through the insulating plate and the bellows and is connected with the concave contact. There is a grounding terminal, and the grounding terminal is arranged in the sealing cover. Since the test device for connecting the air chamber cover plate can be completed on the basis of the original cover plate hole, the goal of easy modification, simple operation, safety and reliability is achieved, the work efficiency and power supply reliability are effectively improved, and at the same time, the maximum protection Personal safety.

Description

Cover plate test device for connecting gas chamber of oil-gas transformer and GIS

technical field

The utility model relates to a cover plate test device used for connecting an oil-gas transformer and a gas chamber of a GIS (Gas Insulated Substation gas-insulated fully enclosed combined electrical appliance), which belongs to the field of high-voltage tests of transformers.

Background technique

In the power system, a kind of oil-gas transformer (transformer group composite combined electrical appliance, represented by T-GIS) has been gradually popularized and applied. Since this oil-gas transformer is different from the traditional power transformer in the way and structure of high-voltage outlets, according to the national GB50150- 2006 "Electrical Equipment Installation Engineering Handover Test Standard for Electrical Equipment" and industry standard Q/GDW1168-2013 "Condition Maintenance Test Regulations for Power Transmission and Transformation Equipment" cannot use the traditional method for electrical testing of oil-gas transformers, because oil-gas transformers are high-voltage The three-phase bushing is directly output through the GIS (Gas Insulated Substation gas insulated fully enclosed combined electrical appliance) connected to it and the cable.

The so-called traditional method is that before the high-voltage electrical test of the power transformer, the tested transformer must be powered off, and then all the terminals on the high and low lead-out lines (via bushings, GIS or cables) should be disconnected. Feasible, but not for oil-gas transformers (T-GIS). If you want to test the oil-gas transformer in operation, you must remove the SF6 gas in the connecting gas chamber between the oil-gas transformer and GIS (Gas Insulated Substation Gas Insulated Totally Enclosed Combined Electrical Appliance), remove the cover plate on the connecting gas chamber, and The connection between the oil and gas bushing and GIS (Gas Insulated Substation Gas Insulated Fully Enclosed Combined Electrical Appliance) can be removed. There is plenty of time for various tests for the handover of new equipment, but the time for high-voltage electrical tests on transformers in operation is too short (generally, the power system outage time does not exceed 12 hours). If the gas in the connecting gas chamber is removed, After all the high-voltage test items of the oil-gas type transformer are completed, restore the wiring, and then let the gas in the connecting air chamber be filled for 24 hours (Article 20.0.5 of the Electrical Equipment Handover Test Standard for Electrical Installation Engineering Electrical equipment can be tested after 24 hours), and the gas test can only be carried out after passing the test. This method takes a long time, has low efficiency, and affects the reliability of power supply.

In order to ensure the reliability of power supply and shorten the time for connecting the gas chamber to discharge SF6 gas, charge SF6 gas and test the oil-gas transformer body after a power failure, a utility model for connecting the oil-gas transformer with GIS (Gas Insulated Substation Gas Insulated Fully Enclosed Combined Electrical Appliance) Connecting the air chamber cover test device can easily solve the above problems.

Glossary:

Oil-gas type transformer: The so-called oil-gas type transformer, also known as transformer group composite combined electrical appliance (expressed as T-GIS), means that the high-voltage lead-out wire of the transformer is not led out through the capacitive bushing, but is directly insulated with GIS (Gas Insulated Substation gas) Fully enclosed combined electrical equipment) connected, and through the GIS (Gas Insulated Substation gas insulated fully enclosed combined electrical equipment) inner cable to the transmission tower.

Connecting gas chamber: The so-called connecting gas chamber is a separate gas chamber connected between the oil-gas transformer and GIS (Gas Insulated Substation gas-insulated fully enclosed combined electrical appliance). ABC three-phase main circuit conductive rod of Substation gas insulated fully enclosed combined electrical appliance). If it is necessary to carry out the factory test or on-site handover acceptance test for the oil-gas transformer, the air chamber needs to be removed, and a special test device with an outer casing is installed at the high-voltage output position of the oil-gas transformer before it can be used in accordance with the national standard GB50150-2006 The high-voltage test items and methods in the "Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard" conduct acceptance tests on oil-gas transformers; if periodic inspection tests are required on oil-gas transformers, the SF6 gas inside the gas chamber needs to be removed, and then opened Remove the cover plate, remove the ABC three-phase main circuit conductive rod, and then pass through the lead hole of the cover plate, and conduct routine tests on the oil-gas transformer according to the high-voltage test items and methods of the industry standard Q/GDW1168-2013 "Test Regulations for Condition Maintenance of Power Transmission and Transformation Equipment" .

Utility model content

In the traditional sense, the connecting air chamber cover plate between the oil-gas type transformer and GIS is only used to remove the connection and sealing function of the internal ABC three-phase conductive rod.

In order to solve the above technical problems, the utility model provides a cover plate test device for connecting the gas chamber of the oil-gas transformer and GIS, which solves the need to exhaust, inflate, and remove the cover of the connecting gas chamber during the test of the oil-gas transformer. Problems with plates and internal conductive rods.

The utility model is achieved through the following technical solutions:

A cover plate test device for connecting an oil-gas transformer to a GIS gas chamber, characterized in that it includes an insulating plate fixedly connected to the connecting gas chamber and a bellows fixed on the insulating plate inside the connecting gas chamber. There are positioning pins on the board for fixing the dynamic test conductive rod. The bellows are fixedly connected with the dynamic test conductive rod. The dynamic test conductive rod passes through the insulating plate and the bellows to connect with the concave contact. The grounding terminal is arranged in the sealing cover.

Wherein, a sealing rubber pad is provided between the sealing cover and the insulating plate.

Wherein, the sealing rubber pad is arranged at the hole of the cover plate connecting the air chamber.

Wherein, the concave contact is connected to the main circuit conductive rod connected to the inside of the gas chamber when it is in the test position.

Wherein, the conductive rod of the dynamic test is short-circuited and connected to the grounding terminal when it is in the running position.

Wherein, the material of the dynamic test conducting rod is copper or galvanized.

Wherein, the sealing cover is made of plastic steel.

Wherein, the material of the concave contact is soft metal.

Wherein, the soft metal material is brass or galvanized.

The utility model provides a cover plate test device which installs three phases on the cover plate and is used for high-voltage test lead-out. The three-phase test conductive device is installed on the insulating plate by using the cover plate hole originally connected to the gas chamber. When the oil-gas transformer test is required, open the plastic-steel sealing cover on the connecting air chamber, remove the three-phase grounding terminal on the insulating plate, push the dynamic test conductive rod on the cover plate, and make the inner bellows drive the test conductive rod After the concave contact contacts the conductive rod of the main circuit, tighten the positioning pin to carry out the high-voltage test; when it is in the running state, loosen the positioning pin, and use the bellows rebound force to make the dynamic test conductive rod leave the main circuit conductive rod, tighten the positioning pin pin, and short-circuit the conductive rod of the three-phase dynamic test outside the insulating cover to ground. The height of the plastic-steel sealing cover is determined according to the external height of the test conductive rod in the running state.

Compared with the prior art, the beneficial effects of the utility model are as follows:

The utility model realizes that when a regular test is required during the normal operation of the power system, the working time can be shortened by the test device for the cover plate of the connecting air chamber, and labor is saved. Compared with the traditional method, the connecting air chamber needs to be exhausted, inflated, and placed statically. The work that can only be completed by waiting for the program can complete the test work of the oil-gas type transformer body with simple external operations, which effectively improves the work efficiency and saves time and effort. The utility model ensures the reliability of power supply, improves the quality of maintenance tests, and reduces the Safety risks, ensuring the safety of people, power grids, and equipment. The utility model is novel in design and reasonable in structure. It does not need to change the structure of the original connecting air chamber, only the original cover plate can be refitted, and the assembly is quick, the insulation is reliable, the operation is simple, the personal safety is guaranteed to the greatest extent, and it is economical. benefits and social benefits.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of the connection between the oil-gas transformer and the GIS combined electrical appliance.

Figure 2 is a schematic diagram of the interior of the air chamber connecting the oil-gas transformer and the GIS combined electrical appliance.

Figure 3 is a schematic diagram of the gas chamber cover test device connected between the oil-gas transformer and the GIS combined electrical appliance at the test position.

Figure 4 is a schematic diagram of the gas chamber cover test device connected between the oil-gas transformer and the GIS combined electrical appliance when it is in the operating position.

In the figure: 1. Connecting the air chamber, 2. Main circuit conductive rod, 3. Oil-gas transformer, 4. Sealing cover, 5. Locating pin, 6. Grounding terminal, 7. Concave contact, 8. Sealing rubber pad, 9. Conductive rod for dynamic test, 10. Bellows, 11. Insulation board, 12. GIS combined electrical appliance.

detailed description

Below in conjunction with embodiment the utility model is described in further detail. The following implementations are only specific implementation examples of the utility model, but the design concept of the utility model is not limited thereto, and any insubstantial changes made to the utility model by using this concept should be within the protection scope of the utility model.

Example

As shown in Figure 1, it is a schematic diagram of the three-dimensional structure of the connection between the oil-gas type transformer and the GIS combined electrical appliance of the present invention. A connecting air chamber 1 is provided between the oil-gas type transformer 3 and the GIS combined electrical appliance 12, and a sealing cover is arranged on the connecting air chamber 1. 4.

As shown in Figure 2, it is a schematic diagram of the internal structure of the connecting air chamber 1 of the present invention. One end of the connecting air chamber 1 is connected to the oil-gas type transformer 3, and the other end is connected to the GIS combined electrical appliance 12. The inside of the connecting air chamber 1 is provided with a three-phase The main circuit conductive rod 2 is provided with a sealing cover 4 on the connecting air chamber 1 .

As shown in Figure 3, it is a schematic diagram of the test device for connecting the air chamber cover plate between the oil-gas type transformer and the GIS combined electrical appliance of the utility model when it is in the test position. The utility model provides a cover plate test device for connecting an air chamber between an oil-gas transformer and a GIS. Rod 9, bellows 10, insulating plate 11 and so on.

Cover plate installation: on the cover plate hole of the original connection air chamber 1, install the utility model specially used for connecting the gas chamber 1 test device between the oil-gas type transformer 3 and the GIS combined electrical appliance 12 on the cover plate, and install the insulating plate 11 for Test the dynamic test conductive rod 9, bellows 10, concave contact 7, positioning pin 5, etc., adjust the position of the bellows 10, so that the concave contact 7 is in good contact with the three-phase main circuit conductive rod 2, and push the dynamic test conductive rod 9 , use the bellows 10 to adjust the position of the concave contact 7 away from the conductive rod 2 of the three-phase main circuit, tighten the positioning pin 5, fix the insulating plate 11 on the connecting gas chamber body 1, connect the dynamic test conductive rod 9 to the grounding terminal 6 connected, after standing for 24 hours, carry out the SF6 gas tightness test and gas test items, and buckle the plastic-steel sealing cover 4 after passing the test.

Test location: Disconnect the circuit breaker and isolating switch on the circuit between the oil-gas transformer 3 and the GIS combined electrical appliance 12, so that there is at least one disconnection point between the oil-gas transformer 3 and the GIS combined electrical appliance 12, so that the high-voltage output of the oil-gas transformer 3 is at In the suspended state, the remaining parts of the GIS combined electrical appliance 12 are grounded. Open the sealing cover 4 on the cover plate test device connecting the oil-gas transformer 3 and the GIS combined electrical appliance 12 to the gas chamber 1, remove the short-circuit line on the dynamic test conductive rod 9 and the grounding terminal 6, and push the ABC three-phase dynamic test to conduct electricity respectively. Rod 9, with the help of the elastic force of bellows 10, the dynamic test conductive rod 9 drives the concave contact 7 to be well connected with the ABC three-phase main circuit conductive rod 2, and the three-phase dynamic test conductive rod 9 on the insulating plate 11 can be connected to the ground. Withstand AC voltage 10kV withstand voltage level.

As shown in Figure 4, it is a schematic diagram of the test device for connecting the air chamber cover plate between the oil-gas type transformer and the GIS combined electrical appliance of the utility model when it is in the operating position.

Operating position: After the test, loosen the positioning pin 5 and rely on the resilience of the bellows 10, so that the ABC three-phase dynamic test conductive rod 9 drives the concave contact 7 to leave the ABC three-phase main circuit conductive rod 2, and the ABC three-phase dynamic test conducts electricity. Rod 9 and concave contact 7 reach the operating position, tighten positioning pin 5, and short-circuit the ABC three-phase test conductive rod 9 and connect it to the grounding terminal 6. After the test insulation plate 11 is well sealed, install the sealing rubber pad 8 and buckle It can run after the upper plastic-steel sealing cover 4.

Claims (9)

1. The cover plate test device for connecting the gas chamber of the oil-gas type transformer to the GIS is characterized in that it includes an insulating plate fixedly connected to the connecting gas chamber and a corrugated pipe fixed on the insulating plate inside the connecting gas chamber, and the insulating There are positioning pins on the board for fixing the dynamic test conductive rod. The bellows are fixedly connected with the dynamic test conductive rod. The dynamic test conductive rod passes through the insulating plate and the bellows to connect with the concave contact. The grounding terminal is arranged in the sealing cover. 2. The cover plate test device for connecting the air chamber between the oil-gas transformer and the GIS according to claim 1, characterized in that a sealing rubber pad is provided between the sealing cover and the insulating plate. 3. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 2, characterized in that the sealing rubber pad is arranged at the hole of the cover plate connecting the gas chamber. 4. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 1, characterized in that the concave contact is connected to the main circuit conductive rod inside the gas chamber when it is in the test position. 5. The cover plate test device for connecting the gas chamber of the oil-gas transformer and GIS according to claim 1, characterized in that the conductive rod for the dynamic test is short-circuited and connected to the grounding terminal when it is in the running position. 6. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 1, characterized in that the material of the dynamic test conductive rod is copper or galvanized. 7. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 1, characterized in that the material of the sealing cover is plastic steel. 8. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 1, characterized in that the material of the concave contact is soft metal. 9. The cover plate test device for connecting the gas chamber between the oil-gas transformer and the GIS according to claim 8, characterized in that the soft metal material is brass or galvanized.