CN102570328A

CN102570328A - 66kv side GIS (gas insulated switchgear) structure of 500kv main transformer

Info

Publication number: CN102570328A
Application number: CN2010105846028A
Authority: CN
Inventors: 耿建风; 王健; 王伟; 张继军; 顾尔重; 田俊强; 连辉; 秦志英
Original assignee: Hennan Electric Power Survey and Design Institute
Current assignee: Gu Erzhong; Lian Hui; Qin Zhiying; Tian Junqiang; Zhang Jijun; PowerChina Henan Electric Power Survey and Design Institute Co Ltd
Priority date: 2010-12-13
Filing date: 2010-12-13
Publication date: 2012-07-11
Anticipated expiration: 2030-12-13
Also published as: CN102570328B

Abstract

The invention relates to a 66kv side GIS (gas insulated switchgear) structure of a 500kv main transformer, which comprises a triangular bus, the triangular bus is connected with a main loop which is connected with all branched loops through a 66kv bus, and the triangular bus, the 66kv bus, the main loop and primary equipment in each branched loop are integrated into GIS equipment; and the main loop consists of a main loop isolation switch and a main loop current transformer connected with the main loop isolation switch. GIS has smallest floor area, and a transformer substation is also arranged regularly and orderly. Simultaneously, as the GIS structure is provided with the main loop without a main breaker, the GIS structure has the following two advantages that (1) the current transformer of the main loop is reserved so that the GIS structure has complete and clear relay protection configuration; and (2) the main loop isolation switch is reserved so that certain running flexibility is provided. When equipment is overhauled, the isolation switches of the main loop and the branched loops can be simultaneously turned on, the GIS structure performs equipment maintenance and overhauling under a condition that the two pole isolation switches are turned on, and a main transformer keeps running continuously.

Description

500kv main transformer 66kv side GIS structure

Technical field

The present invention relates to a kind of 500kv main transformer 66kv side GIS structure.

Background technology

500kv main transformer 66kv side is Ais design, i.e. open type power distribution equipment, and its total loop is formed by isolating switch, main breaker summation current transformer.Up to now; Most 500kv transforming plant main transformer low-pressure side adopts the AIS power distribution equipment; Be generally supported tube type bus, cooperate conventional equipments such as porcelain knob/potting breaker, isolating switch, current transformer, voltage transformer, lightning arrester, constitute medium-sized power distribution equipment outside the room.This design major advantage is that equipment manufacturing cost is low, and weak point is that number of devices is many, and integral arrangement is complicated, in disorder, and floor space is big, and the operating maintenance workload is big.

GIS is main elements such as bus, circuit breaker, isolating switch, current transformer, voltage transformer, lightning arresters; Combined closing is (only exposed externally outlet sleeve pipe or cable termination) in the metal shell of ground connection, fills the switchgear assembly of forming as dielectric with the SF6 gas of certain pressure.The outstanding advantage of GIS be reliability high, arrange clear, practice thrift take up an area of, maintenance workload is little, environmental suitability is strong etc., but price is more expensive comparatively speaking.At present, GIS uses in power grid construction very extensively, but does not use the GIS design in 500kv transformer station low-pressure side; Its reason is the needs that main breaker can not adapt to GIS, so at present when using, usually the whole all deletions of total loop; So not only make the workman overhaul inconvenience, but also caused the differential range of main transformer too little, in a single day 66kv breaks down; Excision is postponed fault time, and differential protection is failure to actuate, and can only start backup protection.

Summary of the invention

The objective of the invention is to: can be in 500kv transformer station with the GIS structure applications, and guarantee that simultaneously the main transformer differential protection range does not have the dead band, can just start protection, excision fault at zero second.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

The present invention includes the △ bus, the △ bus connects total loop, and total loop connects each duplexure through the 66kv bus, and the primary equipment in described △ bus, 66kv bus, total loop and each duplexure all is integrated into GIS equipment; And described total loop is made up of total loop isolating switch and the coupled total loop current transformer that connects.

Described duplexure comprises electric capacity duplexure and reactance duplexure.

Described duplexure also comprises standing uses the power transformation duplexure.

Adopt the present invention of technique scheme, owing to adopt the GIS design, its floor space is dwindled greatly, details is as shown in table 1.

Table 1

Can find out that from table 1 the GIS floor space is minimum, and the layout of transformer station is also the most in good order.Simultaneously, total loop is set among the present invention, but main breaker is not set, it has following 2 advantages: 1) keep the total loop current transformer, make that the relaying protection configuration is complete, clear; 2) keep the total loop isolating switch, certain operational flexibility is provided.When repair apparatus, can the isolating switch of total loop and duplexure be opened simultaneously, under the situation that the two poles of the earth isolating switch is opened, carry out plant maintenance and maintenance, and keep the continuation operation of main transformer.

Description of drawings

Fig. 1 is an overall structure sketch map of the present invention.

Embodiment

As shown in Figure 1; The present invention includes △ bus 1, △ bus 1 connects total loop 2, and total loop 2 connects each duplexure 3 through 66kv bus 9; In the present invention, the primary equipment in above-mentioned △ bus 1,66kv bus 9, total loop 2 and each duplexure 3 all is integrated into GIS equipment.When adopting GIS equipment, because GIS equipment is to rated current, the operation-current of main breaker with to suit parameter request such as reactive current higher, until current, almost neither one GIS producer can produce the main breaker that satisfies parameter request.So the present invention is for addressing this problem; When carrying out the GIS scrap build, total loop is set, but main breaker is not set; Be that total loop 2 is made up of total loop isolating switch 4 and the coupled total loop current transformer 5 that connects; Can accomplish the employing of GIS like this, can guarantee maximum differential protection scope again, convenient maintenance or the like.

For making transformer station's operate as normal, above-mentioned duplexure 3 comprises electric capacity duplexure 6 and reactance duplexure 7, can also comprise that the station is with power transformation duplexure 8 simultaneously.

The operation principle of differential protection of the present invention is: the main transformer differential protection connects from high, medium and low voltage three side current transformers, moves in main transformer height, medium voltage side circuit breaker and each duplexure circuit breaker of low-pressure side.

Protection actuating range: 1) main transformer inside and 1 short circuit of low pressure △ bus, differential protection action, excision main transformer; 2) 66kv bus 9 short circuits, the backup protection action, tripping is high, the medium voltage side circuit breaker, and main transformer is out of service; 3) short circuit behind duplexure 3 circuit breakers, branch circuit breaker excision duplexure; 4) branch circuit breaker tripping, then high, medium voltage side circuit breaker action, excision main transformer.

Claims

1. 500kv main transformer 66kv side GIS structure; It comprises △ bus (1); △ bus (1) connects total loop (2); Total loop (2) connects each duplexure (3) through 66kv bus (9), it is characterized in that: the primary equipment in described △ bus (1), 66kv bus (9), total loop (2) and each duplexure (3) all is integrated into GIS equipment; And described total loop (2) is made up of total loop isolating switch (4) and the coupled total loop current transformer (5) that connects.

2. 500kv main transformer 66kv side GIS structure according to claim 1, it is characterized in that: described duplexure (3) comprises electric capacity duplexure (6) and reactance duplexure (7).

3. 500kv main transformer 66kv side GIS structure according to claim 2 is characterized in that: described duplexure (3) comprises that also the station is with power transformation duplexure (8).