CN106019022B - Cover plate test device for connecting gas chamber between oil-gas type transformer and GIS and operation method - Google Patents

Abstract

The invention provides a cover plate test device for a connection air chamber of an oil-gas type transformer and a GIS (gas insulated switchgear), which comprises an insulating plate fixedly connected to the connection air chamber and a corrugated pipe fixedly arranged on the insulating plate inside the connection air chamber, wherein a positioning pin is arranged on the insulating plate and used for fixing a dynamic test conducting rod, the corrugated pipe is fixedly connected with the dynamic test conducting rod, the dynamic test conducting rod passes through the insulating plate and the corrugated pipe and is connected with a concave contact, a grounding binding post is arranged on the insulating plate, and the grounding binding post is arranged in a sealing cover. The connecting air chamber cover plate test device can be completed on the basis of the original cover plate holes, so that the aims of easy modification, simple operation, safety and reliability are fulfilled, the working efficiency and the power supply reliability are effectively improved, and the personal safety is guaranteed to the greatest extent.

Description

Cover test device and operation for connecting gas chamber between oil and gas transformer and GIS method

Technical field

The invention relates to a cover plate testing device and an operating method for connecting a gas chamber between an oil-gas transformer and a GIS (Gas Insulated Substation), and belongs to the field of high-voltage testing of transformers.

Background technique

In the power system, a kind of oil-gas transformer (transformer group composite electrical appliance, represented by T-GIS) has gradually become popular and used. Because this oil-gas transformer is different from the traditional power transformer in the high-voltage outlet method and structure, according to the national GB50150- The 2006 "Electrical Equipment Handover Test Standard for Electrical Installation Engineering" and the industry standard Q/GDW1168-2013 "Conditional Maintenance Test Procedures for Power Transmission and Transformation Equipment" cannot use traditional methods when conducting electrical tests on oil and gas transformers because oil and gas transformers have high voltages. The three-phase bushing is directly output through the GIS (Gas Insulated Substation) and cable connected to it.

The so-called traditional method is that before conducting high-voltage electrical tests on power transformers, the transformer under test must be powered off, and then the terminal heads on all high and low lead wires (through bushings, GIS or cables) must be disconnected. This method is very effective for conventional power transformers. It is feasible, but not for oil and gas transformers (T-GIS). If you want to test a running oil-gas transformer, you must eliminate the SF6 gas in the connecting air chamber between the oil-gas transformer and GIS (Gas Insulated Substation), remove the cover plate on the connecting air chamber, and This can be done only after removing the connector between the oil and gas casing and GIS (Gas Insulated Substation). There is plenty of time for handover of new equipment and various tests, but for high-voltage electrical tests on operating transformers, the time is too short (generally the power outage time of the power system does not exceed 12 hours). If the gas in the connecting air chamber is eliminated, After all the high-voltage test items of the oil-gas transformer are completed, restore the wiring, and then let the gas in the connecting air chamber stand for 24 hours (GB50150-2006 Electrical Equipment Installation Engineering Handover Test Standard for Electrical Equipment Article 20.0.5 SF6 gas is filled in Electrical equipment can only be tested after 24 hours). Gas testing must be carried out before operation. This method takes a long time, is inefficient, and affects the reliability of power supply.

In order to ensure the reliability of power supply and shorten the time for draining SF6 gas from the connecting air chamber after a power outage, filling it with SF6 gas and testing the body of the oil-gas transformer, a connection between the oil-gas transformer and GIS (Gas Insulated Substation) was invented. The air chamber cover test device can easily solve the above problems.

Glossary:

Oil-gas transformer: The so-called oil-gas transformer, also called a transformer group composite electrical appliance (represented by T-GIS), means that the high-voltage lead wire of the transformer is not led through a capacitive bushing, but is directly insulated with GIS (Gas Insulated Substation) Fully enclosed combined electrical appliances) are connected, and are led to the transmission pole tower through GIS (Gas Insulated Fully enclosed combined electrical appliances) internal cables.

Connecting gas chamber: The so-called connecting gas chamber is a separate gas chamber connecting the oil-gas type transformer and the GIS (Gas Insulated Substation). Inside the gas chamber there are detachable ABC three-phase main circuit conductive rods connecting the oil-gas type transformer and the GIS (Gas Insulated Substation). If it is necessary to conduct factory tests or on-site acceptance tests on the oil-gas type transformer, the gas chamber needs to be removed. After a special test device with an outer sleeve is installed at the high-voltage output position of the oil-gas type transformer, the oil-gas type transformer can be accepted in accordance with the high-voltage test items and methods of the national standard GB50150-2006 "Electrical Equipment Acceptance Test Standard for Electrical Installation Engineering"; if it is necessary to conduct regular inspection tests on the oil-gas type transformer, the SF6 gas inside the gas chamber needs to be removed, and then the cover plate is opened, the ABC three-phase main circuit conductive rods are removed, and then the oil-gas type transformer is routinely tested through the cover plate lead hole in accordance with the high-voltage test items and methods of the industry standard Q/GDW1168-2013 "Power Transmission and Transformation Equipment Status Inspection and Maintenance Test Procedure".

Contents of the invention

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

In order to solve the above technical problems, the present invention provides a cover test device for the air chamber connecting the oil and gas transformer and the GIS, which solves the need to exhaust and inflate the connecting air chamber and remove the connecting air chamber cover when testing the oil and gas transformer. and internal conductive rod issues.

The present invention is achieved through the following technical solutions:

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

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

Wherein, the dynamic test conductive rod is short-circuited and connected to the grounding terminal in the operating position.

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

Wherein, the sealing cover is made of plastic steel.

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

Wherein, the soft metal material is brass material or galvanized material.

The operating method of the cover plate test device for connecting the gas chamber between oil and gas transformers and GIS is characterized by including the following steps:

(1) Install the cover plate: Install the test device for connecting the gas chamber of oil-gas transformer and GIS combination electrical equipment on the cover plate hole of the original connection chamber. Install the dynamic test conductive rod, bellows, concave contact, positioning pin and grounding terminal for the test on the insulating plate. Adjust the position of the bellows so that the concave contact is in good contact with the three-phase main circuit conductive rod. Push the dynamic test conductive rod and adjust the position of the concave contact away from the three-phase main circuit conductive rod with the help of the bellows. Tighten the positioning pin, fix the insulating plate on the connection chamber body, connect the dynamic test conductive rod to the grounding terminal, and leave it for 24 hours.

(2) Test position: Disconnect the circuit breaker and isolation switch on the circuit between the oil and gas transformer and the GIS combined electrical appliance, so that there is at least one disconnection point between the oil and gas transformer and the GIS combined electrical appliance, so that the high voltage output of the oil and gas transformer is in a floating state. , let the rest of the GIS combined electrical appliances be grounded, open the sealing cover on the cover test device of the air chamber connecting the oil and gas transformer and the GIS combined electrical appliances, remove the short-circuit on the dynamic test conductive rod and the grounding terminal, and push the three phases of ABC respectively The dynamic test conductive rod uses the elastic force of the bellows to make the dynamic test conductive rod drive the concave contact and have a good connection with the ABC three-phase main circuit conductive rod. The three-phase dynamic test conductive rods on the insulation board can withstand an AC voltage of 10kV between each other and to the ground. Pressure resistance level;

(3) Operating position: After the test, loosen the positioning pin and use the rebound force of the bellows to make the ABC three-phase dynamic test conductive rod drive the concave contact to leave the ABC three-phase main circuit conductive rod. The ABC three-phase dynamic test conductive rod and the concave contact reach the operating position. Tighten the positioning pin, short-circuit the ABC three-phase test conductive rod and connect it to the grounding terminal. After the insulation board is tested to be well sealed, install the sealing pad and buckle the plastic steel sealing cover before operation.

The present invention provides a cover plate test device for installing three phases for high voltage test lead-out on the cover plate, and using the cover plate hole originally connected to the air chamber, a three-phase test conductive device is installed on the insulating plate. When it is necessary to test the oil-gas transformer, 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, so that the internal bellows drives the test conductive rod and the concave contact to contact the main circuit conductive rod, and then tighten the positioning pin to carry out the high voltage test; when in the running state, loosen the positioning pin, use the bellows rebound force to make the dynamic test conductive rod leave the main circuit conductive rod, tighten the positioning pin, and short-circuit the three-phase dynamic test conductive rod outside the insulating cover plate 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 present invention has the following beneficial effects:

The invention realizes that when regular testing is required during the normal operation of the power system, the connecting air chamber cover test device can be used to shorten the working time and save labor. Compared with the traditional need to exhaust, inflate, and statically discharge the connecting air chamber, etc. The work that can only be completed by a program realizes that the oil and gas transformer body test can be completed by simple external operations, effectively improving work efficiency and saving time and effort. The invention ensures the reliability of power supply, improves the quality of maintenance tests, and reduces safety risks. , to ensure the safety of people, power grids, and equipment. The invention has novel design and reasonable structure. It does not need to change the structure of the original connecting air chamber. It only needs to be modified on the original cover. It is quick to assemble, has reliable insulation, is simple to operate, guarantees personal safety to the greatest extent, and has good economic benefits. and social benefits.

Description of drawings

Figure 1 is a schematic three-dimensional structural diagram of the connection between an oil-gas transformer and a 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 equipment.

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

In the figure: 1. connecting air chamber, 2. main circuit conductive rod, 3. oil-gas transformer, 4. sealing cover, 5. positioning pin, 6. grounding terminal, 7. concave contact, 8. sealing rubber pad, 9. dynamic test conductive rod, 10. bellows, 11. insulating board, 12. GIS combination electrical appliance.

Detailed ways

The present invention is further described in detail below in conjunction with the embodiments. The following embodiments are only examples of specific implementations of the invention, but the design concept of the present invention is not limited thereto, and any non-substantial changes to the present invention using this concept should be within the scope of protection of the present invention.

Example

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

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 transformer 3, and the other end is connected to the GIS combined electrical appliance 12. The interior of the connecting air chamber 1 is provided with a three-phase main The loop conductive rod 2 is connected to the air chamber 1 and is provided with a sealing cover 4.

As shown in Figure 3, it is a schematic diagram of the air chamber cover test device for connecting the oil-gas transformer and the GIS combined electrical appliance of the present invention in the test position. The invention provides a cover test device for an air chamber connecting an oil-gas transformer and a GIS, which mainly consists of a sealing cover 4, a positioning pin 5, a grounding terminal 6, a concave contact 7, a sealing rubber pad 8, and a dynamic test conductive rod. 9. It is composed of bellows 10, insulating plate 11, etc.

Cover installation: On the cover hole of the original connecting air chamber 1, the invented test device specially used to connect the oil and gas transformer 3 and the GIS combined electrical appliance 12 to the air chamber 1 is installed on the cover plate, and the insulating plate 11 is installed for testing. Dynamically test the 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 has good contact with its three-phase main circuit conductive rod 2, push the test conductive rod 9, Use the bellows 10 to adjust the position of the concave contact 7 away from the three-phase main circuit conductive rod 2, tighten the positioning pin 5, fix the insulating plate 11 on the connecting air chamber body 1, and connect the moving test conductive rod 9 and the grounding terminal 6 Connect them, and after leaving them for 24 hours, carry out the SF6 gas sealing test and gas test items. After passing the test, fasten the plastic steel sealing cover 4.

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

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

Operating position: After the test, loosen the positioning pin 5 and use the rebound force of the bellows 10 to make the ABC three-phase dynamic test conductive rod 9 drive the concave contact 7 away from the ABC three-phase main circuit conductive rod 2, and the ABC three-phase dynamic test conductivity Rod 9 and concave contact 7 reach the operating position, tighten the positioning pin 5, short-circuit the ABC three-phase test conductive rod 9 and connect it to the grounding terminal 6. After testing that the insulating plate 11 is well sealed, install the sealing gasket 8 and buckle The plastic steel sealing cover 4 must be installed before operation.

Claims (1)

1. The operating method of the cover plate test device for connecting the air chamber between the oil and gas transformer and the GIS. The cover plate test device includes an insulating plate fixedly connected to the connecting air chamber and a corrugation fixed to the insulating plate inside the connecting air chamber. tube, the insulating plate is provided with positioning pins for fixing the dynamic test conductive rod, the bellows is fixedly connected to the dynamic test conductive rod, the dynamic test conductive rod passes through the insulating plate and the bellows and is connected to the concave contact , a grounding terminal is provided on the insulation board, and the grounding terminal is set in the sealing cover; There is a sealing rubber pad between the sealing cover and the insulating plate; The sealing gasket is arranged at the cover hole connecting the air chamber; The concave contact is connected to the main circuit conductive rod connected to the inside of the air chamber when in the test position; The dynamic test conductive rod is short-circuited and connected to the grounding terminal in the operating position; The material of the dynamic test conductive rod is copper or galvanized material; The sealing cover is made of plastic steel; The material of the concave contact is soft metal; The soft metal material is brass or galvanized; It is characterized in that the operation method includes the following steps: (1) Install the cover plate: Install the test device for connecting the gas chamber of oil-gas transformer and GIS combined electrical equipment on the cover plate hole of the original connection chamber. Install the dynamic test conductive rod, bellows, concave contact, positioning pin and grounding terminal for the test on the insulating plate. Adjust the position of the bellows so that the concave contact is in good contact with the three-phase main circuit conductive rod. Push the dynamic test conductive rod and use the bellows to adjust the position of the concave contact away from the three-phase main circuit conductive rod. Tighten the positioning pin, fix the insulating plate on the connection chamber body, connect the dynamic test conductive rod to the grounding terminal, and leave it for 24 hours. (2) Test position: Disconnect the circuit breaker and isolation switch on the circuit between the oil and gas transformer and the GIS combined electrical appliance, so that there is at least one disconnection point between the oil and gas transformer and the GIS combined electrical appliance, so that the high voltage output of the oil and gas transformer is in a floating state. , let the rest of the GIS combined electrical appliances be grounded, open the sealing cover on the cover test device of the air chamber connecting the oil and gas transformer and the GIS combined electrical appliances, remove the short-circuit on the dynamic test conductive rod and the grounding terminal, and push the three phases of ABC respectively The dynamic test conductive rod uses the elastic force of the bellows to make the dynamic test conductive rod drive the concave contact and have a good connection with the ABC three-phase main circuit conductive rod. The three-phase dynamic test conductive rods on the insulation board can withstand an AC voltage of 10kV between each other and to the ground. Pressure resistance level; (3) Operating position: After the test, loosen the positioning pin and use the rebound force of the bellows to make the ABC three-phase dynamic test conductive rod drive the concave contact away from the ABC three-phase main circuit conductive rod. The ABC three-phase dynamic test conductive rod and the concave contact reach the operating position. Tighten the positioning pin, short-circuit the ABC three-phase test conductive rod and connect it to the grounding terminal. After the insulation board is tested to be sealed well, install the sealing pad and buckle the plastic steel sealing cover before operation.