CN201699326U

CN201699326U - Substation main wiring system based on intermediate-frequency quenching transformer

Info

Publication number: CN201699326U
Application number: CN2010202347216U
Authority: CN
Inventors: 黄友华
Original assignee: CHENGDU HIGH-TECH ZONE NIMA ELECTRONIC PRODUCT DESIGN WORK STUDIO
Current assignee: CHENGDU HIGH-TECH ZONE NIMA ELECTRONIC PRODUCT DESIGN WORK STUDIO
Priority date: 2009-12-11
Filing date: 2010-06-11
Publication date: 2011-01-05
Anticipated expiration: 2020-06-11
Also published as: CN101888064A

Abstract

The utility model discloses a substation main wiring system based on an intermediate-frequency quenching transformer, which is characterized by mainly comprising an intermediate-frequency quenching load voltage-regulating transformer T1, an intermediate-frequency quenching load voltage-regulating transformer T2, a circuit breaker D1, a circuit breaker D3 and a circuit breaker D2. The circuit breaker D1 and the circuit breaker D3 are respectively connected with the intermediate-frequency quenching load voltage-regulating transformer T1 and the intermediate-frequency quenching load voltage-regulating transformer T2, the circuit breaker D2 is connected between a connecting point of the intermediate-frequency quenching load voltage-regulating transformer T1 with the circuit breaker D1 and the connecting point of the intermediate-frequency quenching load voltage-regulating transformer T2 with the circuit breaker D3, an isolating switch DM is further connected between input ends of the circuit breaker D1 and the circuit breaker D3, and simultaneously both neutral points of the intermediate-frequency quenching load voltage-regulating transformer T1 and the intermediate-frequency quenching load voltage-regulating transformer T2 are insulated in a graded manner. The total amount of the equipment adopted by the substation main wiring system is remarkably smaller than that of equipment of the prior art, and the substation main wiring system has the advantages of not only simple integral structure and stable running, but also remarkable reduction of cost.

Description

Transformer substation main connection system based on the mid frequency induction hardening transformer

Technical field

The utility model relates to a kind of electric power supply system, specifically is meant the transformer substation main connection system based on the mid frequency induction hardening transformer that is used for electric substation.

Background technology

Transformer station is the flow direction of voltage of transformation in the electric power system, acceptance and distribution electric energy, control electric power and the electric power facility of adjusting voltage, and it gets up by the grid contact of its transformer with each step voltage.The stand equipment of voltage of transformation effect of power transformation is transformer; in addition; the equipment of transformer station opens and closes the switchgear of circuit in addition, compiles the bus of electric current, metering and control instrument transformer, instrument, protective relaying device and lightning protection device, dispatching communication apparatus etc.Therefore, transformer station is that outwards of transmission of electric energy must be through the place in power plant (water conservancy power plant or firepower electrical plant).

At present, in the electric substation of the most frequently used 110KV, the reason that influences the normal electricity consumption of people is a lot, wherein topmost is exactly that choosing of transformer station's main electrical scheme mode of connection, the way of output and the transformer that are adopted is reasonable inadequately, cause line loss very big, and then making that the equipment voltage that is in electric substation's end is inferior, quality of voltage is defective, seriously influences the useful life of equipment.

The utility model content

The purpose of this utility model be to overcome at present owing to choosing of the mode of connection, the way of output and the transformer of transformer station's main electrical scheme is unreasonable cause the load equipment voltage of electric substation's end inferior, quality of voltage is defective, have a strong impact on the defective in load equipment life-span, provide a kind of not only rational in infrastructure, and can effectively improve the load equipment working voltage and prolong the load equipment transformer substation main connection system based on the mid frequency induction hardening transformer in useful life.

The purpose of this utility model is achieved through the following technical solutions: based on the transformer substation main connection system of mid frequency induction hardening transformer, mainly by mid frequency induction hardening on-load tap-changing transformer T1, mid frequency induction hardening on-load tap-changing transformer T2, circuit breaker D1 and the circuit breaker D3 that is connected with mid frequency induction hardening on-load tap-changing transformer T2 with mid frequency induction hardening on-load tap-changing transformer T1 respectively, and the circuit breaker D2 that is connected between the tie point of the tie point of mid frequency induction hardening on-load tap-changing transformer T1 and circuit breaker D1 and mid frequency induction hardening on-load tap-changing transformer T2 and circuit breaker D3 forms, and between the input of circuit breaker D1 and circuit breaker D3, also be connected with isolating switch DM, simultaneously, the neutral point of described mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is graded insulation.

In order better to realize the utility model, the wiring group of described mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is Y _o/ Y/ Δ-12-11; It is the 110KV circuit breaker of LW29-126/315-40 that described circuit breaker D1, D2, D3 all adopt model; It is the 110KV isolating switch of GW4-126IIDW/1250-31.5 that described isolating switch DM adopts model.

The utility model compared with prior art has the following advantages and beneficial effect:

(1) total quantity of device that the utility model adopted and equipment is starkly lower than the total quantity of one type of prior art syringe and equipment, and not only overall structure is simple, stable, and its cost obviously reduces.

(2) transformer of the present utility model all adopts the mid frequency induction hardening on-load tap-changing transformer, this kind transformer can not only be adjusted voltage by on-load in the rated capacity scope, and its range of regulation is big, can effectively reduce and avoid voltage to fluctuate widely, therefore can guarantee end load quality of voltage stable of transformer.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present utility model.

Overall structure schematic diagram when Fig. 2 is the utility model bringing onto load.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.

Embodiment

In the input-output equipment of all transformer stations, transformer has conclusive effect, the most frequently used transformer of people can be divided into two kinds in on-load tap-changing transformer No-load changer transformer at present, because on-load tap-changing transformer can be adjusted voltage by on-load in the rated capacity scope, range of regulation is big, can reduce and avoid voltage to fluctuate widely, and the No-load changer transformer can only change tap joint position when having a power failure, influence power supply reliability, the output quality of power supply is relatively poor.Therefore, transformer of the present utility model preferentially adopts the mid frequency induction hardening on-load tap-changing transformer, and promptly transformer T1 is that mid frequency induction hardening on-load tap-changing transformer, transformer T2 are the mid frequency induction hardening on-load tap-changing transformer.

As shown in Figure 1, the input of described mid frequency induction hardening on-load tap-changing transformer T1 (former limit) is connected with the input in power station through circuit breaker D1, and the input of mid frequency induction hardening on-load tap-changing transformer T2 (former limit) also is connected with the input in power station through circuit breaker D3.Simultaneously, between the tie point (being the input of mid frequency induction hardening on-load tap-changing transformer T1 and the input of mid frequency induction hardening on-load tap-changing transformer T2) of the input of the tie point of mid frequency induction hardening on-load tap-changing transformer T1 and circuit breaker D1 and mid frequency induction hardening on-load tap-changing transformer T2 and circuit breaker D3, also be connected with circuit breaker D2, and form an internal bridge by circuit breaker D1, short-circuiting device D2 and circuit breaker D3.Between the input of circuit breaker D1 and circuit breaker D3, also be connected with isolating switch DM.Consider the result of use of actual cost and actual time, the wiring group of described mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is Yo/Y/ Δ-12-11, range of regulation is: 110 ± 8*1.5%/38.5 ± 5%/10.5, each coil volume ratio is: 31500/31500/31500.

It is the 110KV circuit breaker of LW29-126/315-40 that described circuit breaker D1, circuit breaker D2, circuit breaker D3 all adopt model, and it is the 110KV isolating switch of GW4-126IIDW/1250-31.5 that isolating switch DM then adopts model.

In use, electric equipment is in operation and bears outside the operating voltage, also usually can suffer superpotential effect, and as the overvoltage that thunder and lightning causes, its numerical value as not taking measures, will make insulation be damaged considerably beyond operating voltage, shorten service life of equipment.Therefore, safe in utilization in order to ensure mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2, the neutral point of this mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is adopted as graded insulation, be that the transformer neutral point insulation level is more much lower than phase line end, the 110K transformer neutral point class of insulation is the 35KV electric pressure, thus neutral point should install additional lightning arrester or the protection gap protection should satisfy following requirement to the neutral point lightning arrester: its impulse sparkover voltage should be lower than the impulse withstand voltage of transformer neutral point; The voltage stabilizing value U (U=0.6UXG) that the neutral point current potential that its extinguishing voltage should cause greater than the electrical network single-phase earthing raises is to guarantee the reliably insulation over the ground of mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2, simultaneously, on mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2, be equipped with lightning arrester.

During output (secondary) external load of mid frequency induction hardening on-load tap-changing transformer T1 of the present utility model and T2, its structure as shown in Figure 2, an output (secondary) that is mid frequency induction hardening on-load tap-changing transformer T1 is drawn power supply buses as the 35KV power supply together through the output (secondary) of circuit breaker DR and mid frequency induction hardening on-load tap-changing transformer T2 after circuit breaker DR, and another output (secondary) of mid frequency induction hardening on-load tap-changing transformer T1 is drawn power supply buses as the 10KV power supply together through another output (secondary) of circuit breaker DR and mid frequency induction hardening on-load tap-changing transformer T2 after circuit breaker DR.According to actual needs, under each bus, can add a certain amount of load end, as long as the total capacity of its load end is no more than the total capacity of every bus.

As mentioned above, just can well realize the utility model.

Claims

1. based on the transformer substation main connection system of mid frequency induction hardening transformer, it is characterized in that: mainly by mid frequency induction hardening on-load tap-changing transformer T1, mid frequency induction hardening on-load tap-changing transformer T2, circuit breaker D1 and the circuit breaker D3 that is connected with mid frequency induction hardening on-load tap-changing transformer T2 with mid frequency induction hardening on-load tap-changing transformer T1 respectively, and the circuit breaker D2 that is connected between the tie point of the tie point of mid frequency induction hardening on-load tap-changing transformer T1 and circuit breaker D1 and mid frequency induction hardening on-load tap-changing transformer T2 and circuit breaker D3 forms, and between the input of circuit breaker D1 and circuit breaker D3, also be connected with isolating switch DM, simultaneously, the neutral point of described mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is graded insulation.

2. the transformer substation main connection system based on the mid frequency induction hardening transformer according to claim 1 is characterized in that: the wiring group of described mid frequency induction hardening on-load tap-changing transformer T1 and mid frequency induction hardening on-load tap-changing transformer T2 is Y _o/ Y/ Δ-12-11.

3. the transformer substation main connection system based on the mid frequency induction hardening transformer according to claim 1 and 2 is characterized in that: it is the 110KV circuit breaker of LW29-126/315-40 that described circuit breaker D1, D2, D3 all adopt model.

4. the transformer substation main connection system based on the mid frequency induction hardening transformer according to claim 1 and 2 is characterized in that: it is the 110KV isolating switch of GW4-126IIDW/1250-31.5 that described isolating switch DM adopts model.