CN106129824B - A kind of direct connection device of three-phase combined type GIS busbares and transformer - Google Patents

Abstract

The invention discloses a direct connection device between a three-phase common box GIS busbar and a transformer, comprising a transformer bottom plate, an oil-gas bushing integrally formed with the transformer bottom plate, a disc insulator for supporting the GIS busbar, and a transformer bottom plate and an The GIS shell between the disc insulators, the oil and gas bushings are provided with corresponding positions of the oil and gas bushings of each phase to the corresponding busbar conductors of each phase, so as to connect each oil and gas bushing to the corresponding busbar conductors through the corresponding intermediate conductors. Each bus conductor is directly connected to the transfer conductor, and a fracture for installing an intermediate conductor is formed between each bushing conductor and the corresponding bus conductor. Since the intermediate conductor is detachable, the intermediate conductor is not installed during the test, and the direct connection device has an obvious fracture, so that it does not affect each other during the test. After the test, the conductive connection between the common box type transformer and the common box type GIS bus can be realized by switching the conductor.

Description

A direct connection device between three-phase common box GIS busbar and transformer

technical field

The invention relates to the technical field of switchgear, in particular to a direct connection device between a three-phase common box GIS bus and a transformer.

Background technique

GIS equipment is a gas-insulated metal-enclosed switchgear, which is composed of a circuit breaker, a disconnector, and a grounding switch.

Guan and other components are directly connected together, and all are sealed in a grounded metal shell, which is filled with a certain pressure of SF6 gas

As insulation and arc extinguishing medium. In the design process of substation GIS, there are more and more cases of direct connection with transformers. However, due to the large difference between GIS equipment and transformer field test items, many items cannot be connected together, resulting in inconvenient field installation and testing.

Chinese patent CN 201708450U (authorized announcement date is 2011.01.12) discloses a direct connection structure for the common box GIS busbar and sub-box outlet transformers, including the middle phase direct connection cylinder and four-way busbar, and two side phase direct connection cylinders The four-way busbar is connected to the common box GIS busbar through the upper interface, the left phase connecting conductor is connected to the left phase transformer direct connection conductor, and the bottom of the four-way busbar is connected to the middle phase transformer direct connection conductor. The lower sides of the left phase direct connection cylinder and the middle phase direct connection cylinder respectively use transition flanges to connect with the transformer oil and gas bushings. The direct connection structure disclosed in this patent document is aimed at the case where the transformer is a sub-box outgoing transformer. Therefore, it is very necessary to design a transitional connection structure from the three-phase common box GIS bus to the transformer for the case where the transformer is a common box type.

Contents of the invention

The purpose of the present invention is to provide a direct connection device between the three-phase common box GIS bus and the transformer for the connection between the three-phase common box-type transformer and the GIS bus.

In order to achieve the above purpose, the technical scheme of the direct connection device between the three-phase common box GIS busbar and the transformer of the present invention is as follows: the direct connection device between the three-phase common box GIS busbar and the transformer includes a transformer bottom plate, an integrated body mounted on the transformer bottom plate The formed oil and gas bushing, the disc insulator used to support the GIS busbar and the GIS shell between the transformer bottom plate and the disc insulator, the oil and gas bushing is located in the GIS shell, and the oil and gas bushing includes the first phase oil and gas bushing, The second-phase oil-gas bushing, the third-phase oil-gas bushing, the disc insulator is provided with the first bus conductor, the second bus conductor and the third bus conductor for connecting with the GIS bus of the corresponding phase, and the oil-gas bushing is equipped with To make each phase of the oil and gas bushing correspond to the position of the corresponding bus conductor of each phase, so as to directly connect each oil and gas bushing to the corresponding bus conductor through the corresponding intermediate conductor, the transfer conductor and the corresponding bus conductor Breaks for installing the intermediate conductors are formed between the busbar conductors.

The GIS housing includes a rigid main housing for connection to the transformer bottom plate and bellows connected between the main housing and the disc insulator.

Hand holes are provided on the GIS housing.

The middle conductor includes a left conductor, a middle conductor, and a right conductor connected in sequence, the right conductor is connected to the corresponding busbar conductor by plugging, the middle conductor and the right conductor are connected by bolts, and the left conductor and the middle conductor connected by bolts.

The transition conductors include mutually independent first transition conductors, second transition conductors, and third transition conductors that are mutually independent at an angle of 120 degrees on the same circumference, the first transition conductors, the second transition conductors, The third transition conductors are respectively connected to the corresponding first-phase oil-gas bushings, second-phase oil-gas bushings, and third-phase oil-gas bushings.

Beneficial effects of the present invention: the direct connection device between the three-phase common box GIS busbar and the transformer of the present invention realizes the connection with the transformer side through the transformer bottom plate and the oil-gas bushing on it, and the disc insulator is provided with a The first bus conductor, the second bus conductor, and the third bus conductor connected to the GIS bus are connected to the GIS through disc insulators. The intermediate conductor in the middle is detachable, and the intermediate conductor is not installed during the test. The direct connection device has an obvious fracture, so that it does not affect each other during the test, and the connection can be quickly restored after the test. The oil and gas bushings are provided with transition conductors for making the positions of the oil and gas bushings of each phase correspond to the corresponding bus conductors of each phase, so as to directly connect each oil and gas bushing with the corresponding bus conductors through the corresponding intermediate conductors, The conductive connection between the common box type transformer and the common box type GIS bus is realized through the transfer conductor. The direct connection device of the present invention has the characteristics of simple structure, convenient operation, convenient field test, reliable operation and the like.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is a D-D sectional schematic diagram of Fig. 1;

Fig. 3 is the E-E sectional schematic diagram of Fig. 1;

Fig. 4 is the schematic diagram of the direct connection device of three-phase common box GIS bus bar and transformer of the present invention during test;

Fig. 5 is a schematic diagram of the direct connection device between the three-phase common box GIS busbar and the transformer of the present invention being loaded into an intermediate conductor.

Detailed ways

Embodiment of the direct connection device between the three-phase common box GIS busbar and the transformer of the present invention: as shown in Figure 1-3, the direct connection device between the three-phase common box GIS busbar and the transformer includes a transformer base plate 1, which is installed on the transformer base plate The integrally formed oil and gas bushing 2 on 1, the disc insulator 7 used to support the GIS busbar and the GIS shell arranged between the transformer bottom plate 1 and the disc insulator 7, the oil and gas bushing 2 is located in the GIS shell. The oil and gas casing 2 includes the first phase oil and gas casing, the second phase oil and gas casing, and the third phase oil and gas casing. The disc insulator 7 is provided with a first bus conductor, a second bus conductor and a third bus conductor for connecting with the GIS bus of the corresponding phase, and the first bus conductor among them is marked as 13 . During installation and use, the first bus conductor 13 , the second bus conductor and the third bus conductor correspond to the first phase bus, the second phase bus and the third phase bus respectively.

The oil and gas bushings are provided with transition conductors for making the positions of the oil and gas bushings of each phase correspond to the corresponding bus conductors of each phase, so as to directly connect each oil and gas bushing with the corresponding bus conductors through the corresponding intermediate conductors, There are three transfer conductors 8, corresponding to each of the three phases. The transfer conductors are respectively denoted as a first transfer conductor 81 , a second transfer conductor 82 , and a third transfer conductor 83 , and a break for installing an intermediate conductor is formed between each transfer conductor and the corresponding bus conductor. The first transfer conductor 81 , the second transfer conductor 82 , and the third transfer conductor 83 are independent of each other, spaced apart, and arranged at an angle of 120 degrees to each other. The first-phase oil-gas bushing, the second-phase oil-gas bushing, and the third-phase oil-gas bushing are evenly distributed along the circumference of the transformer bottom plate. The first phase electrode conductors 9, the second phase electrode conductors, and the third phase electrode conductors are arranged on each transit conductor at intervals of 120 degrees from each other along the circumferential direction. The diameter of the distribution circle where each oil-gas casing is located is larger than the diameter of the distribution circle where each electrode conductor is located. The electrical connection between the oil and gas bushing of each phase and the electrode conductor is realized through the corresponding transfer conductor, and the electrical connection between the oil and gas bushing and the corresponding phase busbar can be realized by installing the corresponding intermediate conductor. The distribution circle of the three-phase conductors on the transformer side is larger than that of the three-phase conductors on the GIS side, and the phase sequence (A, B, C phase) on both sides is also different. It is necessary to set an excessive transfer conductor, which must not only be able to transfer the three-phase conductor from the position of the transformer side to the position of the GIS side, but also ensure the electrical insulation performance of the three-phase conductor. The shape of the transfer conductor is shown in Figure 3, and its size has been strictly calculated to meet the position conversion of the three-phase conductors while also ensuring the insulation performance.

The GIS casing includes a rigid main casing 3 for connecting with the transformer bottom plate and a bellows 6 connected between the main casing 3 and the disc insulator 7 . Hand holes 4 are provided on the two sides of the main housing to facilitate the connection of the internal conductors during docking. The hand holes are provided with a cover plate 5, and the cover plate 5 and the hand hole 4 are connected by bolts. The connecting end of the corrugated pipe 6 and the main casing is provided with a connecting flange plate, and the detachable connection between the connecting flange plate and the main casing 3 is realized by bolts.

The middle conductor includes a left conductor 10 , a middle conductor 11 , and a right conductor 12 which are sequentially connected. The right conductor 12 is plug-connected with a corresponding busbar conductor, and is electrically connected through contacts. The middle conductor 11 and the right conductor 12 are connected by bolts, and the left conductor 10 and the middle conductor 11 are connected by bolts.

As shown in Figure 4, during the field test, the left conductor 10, the middle conductor 11, and the right conductor 12 are not installed, and an obvious fracture is formed in the middle to fully isolate the transformer from the GIS and facilitate their respective tests. After the test is completed, the internal conductors need to be connected, as shown in Figure 5. Take one of the phases as an example. At this time, it is only necessary to compress the bellows 6 to the GIS side for a certain distance, put the right conductor 12 vertically, and place the contact The head side is inserted into the contact finger side of the first bus conductor 13 fixed on the disc insulator, and then the left conductor 10 and the middle conductor 11 are installed, and the left conductor 10, the middle conductor 11 and the right conductor 12 are carried out using the space compressed by the bellows. The bolts between them are fastened and connected, and then the state of the bellows is restored to complete the conductor connection between the transformer and the GIS. Through the ingenious design of the conductor connection method and size, this structure realizes the connection of the internal conductor through the space compressed by the bellows without dismantling the shell after the field test, which is the so-called connection structure.

In other embodiments, the transfer conductors may not be independent of each other, and the three-phase transfer conductors may be arranged on the same insulator to form an integral structure, the first transfer conductor, the second transfer conductor, the third transfer conductor The transfer conductors are insulated from each other, and can meet the requirements of electrically connecting the corresponding oil and gas casing and the intermediate conductor.

Claims (3)

1. the direct connection device of three-phase combined type GIS busbares and transformer, it is characterised in that：Including transformer bottom plate, mounted on described Integrally formed oil-gas casing on transformer bottom plate is used to support the disk insulator of GIS busbares and set on transformer bottom plate GIS housings between disk insulator, oil-gas casing are located in GIS housings, and oil-gas casing includes the first phase oil-gas casing, the Two-phase oil-gas casing, third phase oil-gas casing, disk insulator are equipped with the first mother for being connected with the GIS busbares of corresponding phase Line conductor, the second bus-bars conductor, third bus-bars conductor, oil-gas casing are equipped with to make each phase oil-gas casing and corresponding each phase The position of bus-bars conductor is corresponding, straight by each oil-gas casing and corresponding each bus-bars conductor will pass through corresponding middle conductor Switching conductor even, the fracture formed between conductor and corresponding bus-bars conductor for installing the middle conductor of transferring；It is described Middle conductor includes sequentially connected left conductor, middle conductor, right conductor, and the right conductor connects with corresponding bus-bars conductor grafting It connects, the middle conductor is bolted with the right conductor, is bolted between the left conductor and middle conductor；It is described Switching conductor include mutually independent the first switching conductor for being in 120 degree of angles on the same circumference, the second switching conductor, Third transfer conductor, first switching conductor, second switching conductor, third switching conductor respectively with corresponding first phase oil gas set Pipe, the connection of the second phase oil-gas casing, third phase oil-gas casing；First phase oil-gas casing, the second phase oil-gas casing, third phase oil gas Casing is circumferentially uniformly distributed along transformer bottom plate, and the first phase electrode conductor, the second phase electrode conductor, third are provided on each conductor of transferring Phase electrode conductor is spaced 120 degree of arrangements circumferentially from one another, and the distribution diameter of a circle where each oil-gas casing is more than each electrode conductor The distribution diameter of a circle at place, the distribution circle where each oil-gas casing and the distribution circle where each electrode conductor are in inside and outside distribution, And respectively switching conductor extends from inside to outside；Each electrode conductor is connected with the left end of corresponding left conductor.

2. the direct connection device of three-phase combined type GIS busbares according to claim 1 and transformer, it is characterised in that：The GIS Housing includes the rigid main casing for being connect with transformer bottom plate and is connected to the main casing and the disk insulator Between bellows.

3. the direct connection device of three-phase combined type GIS busbares according to claim 1 or 2 and transformer, it is characterised in that：It is described GIS housings are equipped with hand hole.