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Parallel circuit breaker

A circuit breaker and parallel connection technology, applied in circuit breaker parts, circuits, inductors, etc., can solve the problem of large power consumption of series inductance, and achieve the effect of improving the overall breaking capacity

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve the above-mentioned current sharing effect, the series inductance cannot be too small, and the series inductance will bring a lot of power consumption when the system is running normally.

Method used

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Experimental program
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Embodiment Construction

[0022] figure 1 In the above, two left coupling inductance coils 4 and right coupling inductance coils 5 with the same number of turns are wound on the "口" shaped iron core, which is a structure similar to a single-phase transformer; the loop current 1 flows in from the non-identical end of the coil, so that the left The direction of magnetic flux generated by branch current 2 and right branch current 3 in the iron core is opposite.

[0023] The left arc extinguishing chamber 6 and the right arc extinguishing chamber 7 can use two independent circuit breakers, or two arc extinguishing chambers using the same control mechanism, so as to facilitate the synchronous action of the contacts of the two arc extinguishing chambers. For high voltage systems, use SF in the interrupter 6 For arc extinguishing medium. In specific applications, the left arc extinguishing chamber 3 and the right arc extinguishing chamber 4 can use other types of breaking devices.

[0024] figure 2 The c...

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Abstract

The parallel circuit breaker belongs to the high-voltage large-capacity circuit breaker device, and its purpose is to automatically share and limit the current and realize the parallel operation of multiple arc extinguishing chambers. The present invention is composed of 2 to 4 branches connected in parallel. Each branch includes a series inductance coil and a switch interrupter. The inductance coil is wound on a common iron core to form a coupled inductance coil. The number of turns of the inductance coil in each branch is Equal, the system current flows into the inductance coils of 2 to 4 branches and the arc extinguishing chambers connected in series with them, and the magnetic flux generated by the inductance coils of each branch and the inductance coils of other branches in each magnetic circuit of the core On the contrary; the arc extinguishing chambers of each branch are large-capacity gas interrupting chambers, and 2 to 4 arc extinguishing chambers in parallel use parallel arc extinguishing chamber devices controlled by the same system, or use separate 2 to 4 arc extinguishing chambers. 4 circuit breakers connected in parallel. Based on the coupled inductance structure, the invention realizes the parallel breaking of multiple circuit breaker arc extinguishing chambers and improves the overall breaking capacity.

Description

technical field [0001] The invention belongs to a high-voltage large-capacity circuit breaker device, in particular to a large-capacity circuit breaker using coupled inductance, which can automatically equalize / limit current and realize parallel operation of multiple arc extinguishing chambers. Background technique [0002] With the continuous strengthening of power system networking, the short-circuit capacity of the system is getting larger and larger, even exceeding the rated breaking current of the high-voltage circuit breaker. In addition, when a port short circuit occurs in a large-capacity generator, the resulting short-circuit current will also exceed the breaking capacity of the current high-voltage circuit breaker. According to calculations, when there is a short circuit at the outlet end of the Three Gorges generator set, the short circuit current can reach 300kA, while the breaking current of the existing domestic 500kV circuit breaker can only reach 63kA, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H73/18H01H73/02H01F38/14
Inventor 潘垣何俊佳程时杰袁召文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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