CN204008705U - Partial discharge monitoring Cap for tin body - Google Patents

Abstract

The utility model relates to the field of GIS fault detection, and provides a partial discharge on-line monitoring tank cover, which includes a tank body and a tank cover arranged on the tank body, and the tank cover is sealed and connected with the tank body. The inner side of the tank cover is provided with an antenna, and the antenna is covered with an insulating protective layer. The antenna is connected to an N-type connector, and the N-type connector is arranged on the outside of the tank cover. The N-type connector Connection to partial discharge measuring equipment. The utility model can monitor the insulation fault in the GIS tank in real time through the antenna arranged inside the tank cover and the partial discharge measuring equipment connected with the antenna, and has a good response to various types of partial discharge inside the GIS. And it effectively avoids various background noise interference in the field environment, has a good signal-to-noise ratio, and the insulating protective layer wrapped around the insulating antenna can avoid damage to the antenna caused by breakdown.

Description

Partial discharge on-line monitoring tank cover

technical field

The utility model relates to the field of GIS fault detection, in particular to a partial discharge on-line monitoring tank cover.

Background technique

Gas Insulated Switchgear (GIS, Gas Insulated Switchgear) is composed of circuit breaker, isolating switch, grounding switch, transformer, lightning arrester, busbar, connector and outlet terminal, etc. These devices or components are all enclosed in a metal grounding shell Among them, a tank structure is formed. Compared with conventional open substations, GIS has the advantages of compact structure, small footprint, high reliability, flexible configuration, convenient installation, strong safety, strong environmental adaptability, and low maintenance workload. It is very small, and it is filled with a certain pressure of SF6 insulating gas inside, so it is also called SF6 fully enclosed combination appliance. GIS is high-voltage electrical equipment with high operational reliability, less maintenance workload, and long maintenance cycle. Its failure rate is only 20% to 40% of conventional equipment, but GIS also has its inherent shortcomings. Infiltration, the presence of conductive impurities, the aging of insulators and other factors may lead to internal flashover faults in GIS. The fully sealed structure of GIS makes it difficult to locate and repair faults, and the maintenance work is complicated. The average maintenance time after an accident is longer than that of conventional equipment, and its power failure range is large, often involving non-faulty components.

According to the statistical analysis of actual faults, the reduction of insulation performance is the main cause of GIS faults, and the early stage of GIS insulation faults is partial discharge before breakdown. Therefore, from the perspective of the long-term development of the power system, it is very necessary to monitor partial discharge on-line with GIS, which is conducive to rationally arranging equipment maintenance and avoiding failures.

Utility model content

(1) Technical problems to be solved

The utility model aims to solve the problem that the insulation fault of GIS equipment is difficult to detect.

(2) Technical solutions

In order to solve the above technical problems, the utility model provides a partial discharge on-line monitoring tank cover, the tank cover is set on the tank body, the tank cover is sealed with the tank body, and the tank body The inner side of the cover is provided with an antenna, and the antenna is covered with an insulating protective layer. The antenna is connected with an N-type joint, and the N-type joint is arranged on the outside of the tank cover. The N-type joint is connected with the partial discharge measurement The device is connected.

Preferably, a sealing ring is provided between the tank cover and the tank body.

Preferably, the inner surface of the can body cover is provided with an annular groove, the groove depth of which is smaller than the section diameter of the sealing ring, and the sealing ring is arranged in the annular groove.

Preferably, Vaseline is coated on the contact surface between the tank cover and the tank body and on the periphery of the sealing ring.

Preferably, a socket is provided on the inside of the tank cover, and the socket is connected to the N-type connector, and a plug is provided on the outside of the antenna, and the plug is movably inserted into the socket.

Preferably, the tank cover is bolted to the tank body.

Preferably, the insulating protection layer is made of polytetrafluoroethylene.

Preferably, the antenna is a partial discharge ultra-high frequency antenna.

(3) Beneficial effects

The utility model provides a partial discharge on-line monitoring tank cover. The tank cover is sealed and connected to the tank body. An antenna is arranged inside the tank cover. Real-time monitoring of insulation faults in the GIS tank can respond well to various types of partial discharges inside the GIS, and effectively avoid various background noise interference in the field environment, with good signal-to-noise ratio, insulation The insulating protective layer wrapped around the antenna can prevent damage to the antenna caused by breakdown.

Description of drawings

Fig. 1 is an exploded view from inside perspective of a partial discharge on-line monitoring tank cover according to an embodiment of the present invention.

Fig. 2 is an exploded view from an outside perspective of a partial discharge on-line monitoring tank cover according to an embodiment of the present invention.

Among them: 1. Tank cover; 11. N-type connector; 12. First through hole; 13. Second screw hole; 14. Jack; 15. Annular groove; 2. Antenna; 21. Plug; 22. Chassis; 23. The second through hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

As shown in Figures 1 and 2, a partial discharge on-line monitoring tank cover 1 provided by the embodiment of the present invention includes a tank cover 1 and a tank body. The tank cover 1 is arranged at the opening of the tank body, and the tank cover 1 is a stainless steel plate with a diameter of 360mm and a thickness of 25mm. A plurality of first through holes 12 are arranged on the edge circumference of the tank body cover 1, and a plurality of first bolt holes are arranged on the corresponding circumference of the opening of the tank body. In the first through hole 12 and the first threaded hole, the tank body cover 1 is tightly connected with the tank body. An antenna 2 is provided at the center of the inner side of the tank cover 1, and the antenna 2 is provided with a chassis 23. A plurality of second through holes are arranged on the circumference of the chassis 23, and a plurality of second through holes are arranged on the circumference of the inner side of the tank cover 1. The second screw hole 13 is used to connect the antenna 2 and its chassis 23 to the center of the inner side of the tank cover 1 through bolts passing through the second through hole and the second screw hole 13 . The side where the antenna 2 is connected to the tank cover 1 is provided with a plug 21, and the center position of the inner side of the tank cover 1 is provided with a jack 14, and the plug 21 of the antenna 2 is pluggably connected with the jack 14 of the tank cover 1, When the antenna 2 is bolted to the inner side of the tank cover 1 , the plug 21 of the antenna 2 is inserted into the insertion hole 14 of the tank cover 1 . The outside of the tank rod is provided with an N-type connector 11, which is commonly used and can be connected to most measuring equipment. The N-type connector 11 is connected to the jack 14 on the tank cover 1, and the N-type connector 11 is connected to the partial discharge The measuring equipment is plugged in, so as to realize the monitoring of the partial discharge in the tank. The antenna 2 is covered with an insulating protection layer, which is preferably made of polytetrafluoroethylene, so as to avoid damage to the antenna 2 due to breakdown.

Antenna 2 is preferably a partial discharge ultra-high frequency antenna with a frequency of 300MHz to 3000MHz. The partial discharge ultra-high frequency antenna is based on Hilbert fractal technology to measure partial discharge signals. It has high sensitivity and strong anti-interference ability, so that the detection results are accurate. Antenna 2 is covered with an insulating protective layer, which can prevent damage to antenna 2 when discharge breakdown occurs in the tank. An N-type joint 11 is provided on the outside of the tank body cover 1, and the N-type joint 11 is connected to the partial discharge measurement equipment. .

Due to the influence of factors such as the leakage of SF6 gas, the infiltration of external moisture, the existence of conductive impurities, and the aging of insulators, it may cause internal flashover faults in GIS. , it is necessary to ensure that there is no gap between the metal cover and the tank body. In order to ensure sufficient airtightness, a sealing ring is sandwiched between the tank body cover 1 and the tank body. The sealing ring is preferably an O-ring. The inner side of 1 and the periphery of antenna 2 are provided with annular groove 15, the groove depth of annular groove 15 is less than the section diameter of sealing ring, sealing ring is arranged in annular groove 15, and a part of sealing ring protrudes from annular groove 15, when tank body When the cover 1 is set on the tank body, the sealing ring is sandwiched between the tank cover 1 and the tank body to form a seal. Preferably, a layer of Vaseline is coated on the contact surface between the tank cover 1 and the tank body and on the periphery of the sealing ring, so that the sealing effect is better.

Operation process:

The plug of the antenna is inserted into the socket inside the tank cover, and the bolt is passed through the second through hole 23 and the second screw hole, so that the antenna is fixed to the center position inside the tank cover. Set the sealing ring in the annular groove inside the tank cover, and coat a layer of vaseline on the inside of the tank cover outside the sealing ring, put the tank cover on the tank body, and connect the first through hole through the bolt and in the first screw hole, tighten the bolts so that a sealed connection is formed between the tank body cover and the tank body. Connect the N-type joint on the outside of the tank cover to the partial discharge measuring equipment, so that the partial discharge phenomenon in the tank can be detected through the connection of the partial discharge measuring equipment, which can effectively reflect the internal operation status of the GIS. In the event of a defect or failure, the staff can identify and deal with the situation in a timely manner, thereby improving the safety of the power system.

The above is only the preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and replacements can also be made. And replacement should also be regarded as the protection scope of the present utility model.

Claims (8)

1. A partial discharge on-line monitoring tank cover, the tank cover (1) cover is located on the tank body, it is characterized in that, the tank cover (1) is sealed and connected with the tank body, the tank body The inner side of the body cover (1) is provided with an antenna (2), the periphery of the antenna (2) is provided with an insulating protective layer, and the antenna (2) is connected with an N-type connector (11), and the N-type connector (11 ) is arranged on the outside of the tank cover (1), and the N-type joint (11) is connected with the partial discharge measuring equipment. 2. The partial discharge on-line monitoring tank cover according to claim 1, characterized in that a sealing ring is provided between the tank cover (1) and the tank body. 3. The partial discharge on-line monitoring tank cover according to claim 2, characterized in that, the inner side of the tank cover (1) is provided with an annular groove (15), and the groove depth of the annular groove (15) is less than The section diameter of the sealing ring, the sealing ring is arranged in the annular groove (15). 4. The partial discharge on-line monitoring tank cover according to claim 2, characterized in that, the contact surface between the tank cover (1) and the tank body and the periphery of the sealing ring are coated with vaseline . 5. The partial discharge on-line monitoring tank cover according to claim 1, characterized in that, the inside of the tank cover (1) is provided with a jack (14), and the jack (14) is connected to the N A type connector (11) is connected, and a plug (21) is provided on the outside of the antenna (2), and the plug (21) is movably plugged into the jack (14). 6. The partial discharge on-line monitoring tank cover according to claim 1, characterized in that the tank cover (1) is connected with the tank body by bolts. 7. The partial discharge on-line monitoring tank cover according to claim 1, wherein the insulating protection layer is made of polytetrafluoroethylene. 8. The partial discharge on-line monitoring tank cover according to claim 1, characterized in that the antenna (2) is a partial discharge ultra-high frequency antenna.