CN2862287Y

CN2862287Y - On-load tapchanger of transformer without electric arc

Info

Publication number: CN2862287Y
Application number: CN 200520092854
Authority: CN
Inventors: 阮作伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-12
Filing date: 2005-10-12
Publication date: 2007-01-24
Anticipated expiration: 2015-10-12

Abstract

The utility model provides an on-load tap changer for arc-free transformer, which includes fixed contact C, main contact B, reversing contacts H1, H2, and transition contacts G1, G2 on tap section of transformer. The connection method of each contact with output terminal A is: the main contact B is directly connected with the output terminal A, the transition contacts G1, G2 are respectively connected with the output terminal A via parallel-connected solid state relay SSR and divider resistance, division point of the divider resistance is connected with the reversing contact H via step-down resistance, full-wave rectifier DZ is connected between the transition contacts G1, G2 and reversing contact H, rectifier DZ1 is used for providing trigger voltage to solid state relay SSR2, and rectifier DZ2 is used for providing trigger voltage to solid state relay SSR1. The inventive on-load tap changer has the advantages of simple structure, low cost, high reliability, maintenance free, and no need for lifting core of transformer during maintenance. The utility model is applied by replacing transition resistance and instantaneous mechanism in existing oil-blast compound and combined on-load tap changers with this device.

Description

A kind of Arc-free on-load tap-changer of transformer

Technical field

The utility model relates to the power transformer on-load voltage regulating device.

Background technology

Use by the form on-load voltage regulating switch of current-limiting resistance bridging oil arc extinguishing fast at present the used on-load voltage regulating switch of power transformer that can the on-load regulation voltage is most, because greasy dirt is dyed greatly with oil blast, maintenance workload is big, thereby reliability is affected, contact burning will often upgrade, and often filter transformer oil, because the pressure regulation process has circulation, easily cause voltage fluctuation and overvoltage.At present for overcoming the problems referred to above, loaded switch with vacuum extinction has appearred, use in the following system of 35Kv, but still need transition resistance, and see on the interrelated data and use controllable silicon, adopt permutation and combination method to carry out on-load voltage regulation, but technology is complicated, also very high to the controllable silicon requirement, also useful controllable silicon and mechanical contact are united the tap changer of use, but do not apply because of technical existing problems.

Summary of the invention

The purpose of this utility model is the problem that exists at the on-load voltage regulating switch that generally uses at present oil blast, and a kind of ac solid relay zero passage commutation that utilizes is provided, and does not have electric arc, does not have circulation, does not need the power transformer on-load voltage regulating device of quick mechanism.

The utility model provides a kind of Arc-free on-load tap-changer of transformer, it is characterized in that: comprise shunting switch circuit and solid-state relay circuit, the shunting switch circuit is by transformer tap section fixed contact C, main contact B, commutation contact H1, H2 and transition contact G1, G2 forms, each contact is connected with output terminals A by the solid-state relay circuit, method of attachment is as follows: commutation contact H1, H2 and transition contact G1, the G2 left-right symmetric distributes, main contact B directly is connected with output terminals A, transition contact G is connected with output terminals A with divider resistance by solid-state relay SSR in parallel, the dividing point of divider resistance is connected with commutation contact H by dropping resistor, be connected to full-wave rectifier DZ between transition contact G and commutation contact H, rectifier DZ1 provides trigger voltage for solid-state relay SSR2, and rectifier DZ2 provides trigger voltage for solid-state relay SSR1.

Process when mechanical main contact B switches to fixed contact C2 by fixed contact C1, its operation principle is as follows:

Normal condition as shown in Figure 1, transition contact G1, transition contact G2 are contactless in the middle of two fixed contacts, solid-state relay SSR1, solid-state relay SSR2 do not have electric current.

Beginning is switched to fixed contact C2, when going to Fig. 2 position, transition contact G1 and main contact B are simultaneously on fixed contact C1, transition contact G2 is to fixed contact C2, divider resistance R21, added step voltage on the R22, produce triggering signal voltage, this signal voltage is synthetic by the voltage drop that step voltage and load current produce on voltage divider, but at this moment the trigger voltage of solid-state relay SSR2 is because of transition contact G1 and commutation contact H1 short circuit on same fixed contact C1, so solid-state relay SSR2 can not conducting, have only the solid-state relay SSR1 can conducting, at this moment main contact B can leave fixed contact C1, do not have voltage, do not have electric arc.

When going to Fig. 3 position, transition contact G1 and no longer short circuit of commutation contact H1, triggering signal can be provided, and solid-state relay SSR1 is closed in commutation contact H2 and transition contact G2 short circuit, opens solid-state relay SSR2, because solid-state relay SSR1 needs current over-zero just can close, could be open-minded after so SSE2 has only solid-state relay SSR1 to close at second cycle, there is not the circulation process, begin commutation.

When continuing to go to Fig. 4 position, solid-state relay SSR2 conducting, main hoe B does not promptly enter fixed contact C2 under no-voltage has conditions at the arc, and transition contact G2 yet no-voltage does not have electric arc and leaves fixed contact C2, steadily switches.

Move on and just get back to the state of Fig. 1, substituted fixed contact C1 by fixed contact C2, fixed contact C3 has substituted fixed contact C2, and handoff procedure is finished.

Because circuit is symmetrical, so otherwise principle is also identical.

The utility model provides a kind of advantage of Arc-free on-load tap-changer of transformer to be: simple in structure, low price, the reliability height, can accomplish non-maintaining, even maintenance is only taken out maintenance to fuse, without the transformer suspended core; Can be applied in the compound and combined loaded switch of existing oil blast, original oil blast loaded switch basic structure is constant, has just cancelled transition resistance and quick mechanism, increases this device and gets final product.

Description of drawings

Fig. 1 is the circuit diagram of Arc-free on-load tap-changer of transformer, normal condition:

Fig. 2 is the circuit diagram of Arc-free on-load tap-changer of transformer, switches the state in early stage:

Fig. 3 is the circuit diagram of Arc-free on-load tap-changer of transformer, the beginning switching state:

Fig. 4 is the circuit diagram of Arc-free on-load tap-changer of transformer, steadily switching state:

Embodiment

Arc-free on-load tap-changer of transformer, comprise shunting switch circuit and solid-state relay circuit, the shunting switch circuit is by transformer N tap section fixed contact C1, C2, C3, C4, ..., Cn, main contact B, commutation contact H1, H2 and transition contact G1, G2 forms, each contact is connected with output terminals A by the solid-state relay circuit, method of attachment is as follows: commutation contact H1, H2 and transition contact G1, the G2 left-right symmetric distributes, main contact B directly is connected with output terminals A, transition contact G1 is by solid-state relay SSR1 and divider resistance R11 in parallel, R12 is connected with output terminals A, divider resistance R11, the dividing point of R12 is connected with commutation contact H1 by dropping resistor R1, be connected to full-wave rectifier DZ1 between transition contact G1 and commutation contact H1, rectifier DZ1 provides trigger voltage for solid-state relay SSR2; Transition contact G2 is connected with output terminals A with divider resistance R21, R22 by solid-state relay SSR2 in parallel, the dividing point of divider resistance R21, R22 is connected with commutation contact H2 by dropping resistor R2, be connected to full-wave rectifier DZ2 between transition contact G2 and commutation contact H2, rectifier DZ2 provides trigger voltage for solid-state relay SSR1.

Claims

1, a kind of Arc-free on-load tap-changer of transformer, it is characterized in that: comprise shunting switch circuit and solid-state relay circuit, the shunting switch circuit is by transformer tap section fixed contact C, main contact B, commutation contact H1, H2 and transition contact G1, G2 forms, each contact is connected with output terminals A by the solid-state relay circuit, method of attachment is as follows: commutation contact H1, H2 and transition contact G1, the G2 left-right symmetric distributes, main contact B directly is connected with output terminals A, transition contact G is connected with output terminals A with divider resistance by solid-state relay SSR in parallel, the dividing point of divider resistance is connected with commutation contact H by dropping resistor, be connected to full-wave rectifier DZ between transition contact G and commutation contact H, rectifier DZ1 provides trigger voltage for solid-state relay SSR2, and rectifier DZ2 provides trigger voltage for solid-state relay SSR1.