Parallel circuit breaker

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

Inactive Publication Date: 2008-03-19
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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Examples

Experimental program
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Embodiment Construction

[0022] In Fig. 1, two left coupled inductive coils 4 and right coupled inductive 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, The direction of the magnetic flux generated by the left branch current 2 and the 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] In Fig. 2, the common iron core a...

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PUM

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Abstract

A parallel circuit breaker is provided, which belongs to a high-voltage high-capacity circuit breaker and is to provide automatic current equalization and current limitation and realize the parallel operation of a plurality of arc-extinguishing chambers. The invention comprises parallel-connected 2-4 shunts each comprises an inductance coil and an arc-extinguishing chamber of switches in series connection, wherein the induction coil is enwound around a share iron core to form a coupling inductance coil and the turn number of inductance coil of each shunt is the same. The system current flows through the inductance coils of the 2-4 parallel-connected shunts individually and the arc-extinguishing chambers in series connection with the shunts. The magnetic flux of the magnetic circuit produced by the interaction between the iron core and the inductance coil of each shunt is opposite to that of the other shunts. The arc-extinguishing chamber of each shunt has high capacity, 2-4 parallel-connected arc-extinguishing chambers share the parallel-connected arc-extinguishing chamber device controlled by the same system, or are connected in parallel by 2-4 separated circuit breakers. Based on the structure of the coupling inductance, the invention realizes the parallel-connected on-off of a plurality of arc-extinguishing chambers of the circuit breakers and improves the capacity of on-off of the whole circuit breaker.

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 Applications(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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