CN201868854U - GIS (gas insulated switchgear) structure changing 500KV main power supply into 66KV side power supply - Google Patents

Abstract

The utility model discloses a GIS (gas insulated switchgear) structure changing a 500KV main power supply into a 66KV side power supply, comprising a delta bus which is connected with a main loop, the main loop is connected with all branch loops through 66KV buses, and the delta bus, the 66KV buses and the main loop as well as primary devices in the branch loops are integrated into GIS equipment; and the main loop consists of a main loop isolating switch and a main loop current transformer connected with the switch. A GIS occupies the least space, and a transformer substation is arranged most orderly. Simultaneously, in the utility model, the main loop is arranged while a main breaker is not arranged. The GIS structure has the following advantages: the main loop current transformer is kept so as to enable a relay protective device to be complete and distinct; the main loop isolating switch is kept to provide certain running flexibility; and when the device is overhauled, the isolating switches of the main loop and the branch loops can be simultaneously switched on, and the device is maintained and overhauled under the situation that the two stages of isolating switches are switched on, so that the main transformer can be kept running continuously.

Description

A kind of 500kv main transformer 66kv side GIS structure

Technical field

The utility model 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, integral arrangement complexity, 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 is the reliability height, it is clear to arrange, save 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 very extensive in power grid construction, but does not use the GIS design in 500kv transformer station low-pressure side, and its reason is the needs that main breaker can not adapt to GIS; so at present when using; usually, so not only make the workman overhaul inconvenience, but also caused the differential range of main transformer too little the whole all deletions of total loop; 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.

The utility model content

The purpose of this utility model is: 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 achieving the above object, the utility model is by the following technical solutions:

The utility model comprises the △ bus, and the △ bus connects total loop, and total loop connects each duplexure by 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 coupled total loop current transformer.

Described duplexure comprises electric capacity duplexure and reactance duplexure.

Described duplexure also comprises station power transformation duplexure.

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

Table 1

As can be seen from Table 1, GIS floor space minimum, and the layout of transformer station is also the most in good order.Simultaneously, total loop is set in the utility model, 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, the isolating switch of total loop and duplexure can 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 schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, the utility model comprises △ bus 1, and △ bus 1 connects total loop 2, and total loop 2 connects each duplexure 3 by 66kv bus 9, in the utility model, 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 utility model 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 coupled total loop current transformer 5; can finish 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 station power transformation duplexure 8 simultaneously.

The operation principle of the utility model differential protection is: the main transformer differential protection connects from high, medium and low voltage three side current transformers, moves in each duplexure circuit breaker of main transformer height, medium voltage side circuit breaker and 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 height, medium voltage side circuit breaker, 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 (3)

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) by 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 coupled total loop current transformer (5).

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) also comprises station power transformation duplexure (8).

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