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Patent Searching and Data


Title:
DIRECT-CURRENT CIRCUIT BREAKER OF MULTI-TERMINAL DIRECT-CURRENT POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/246976
Kind Code:
A1
Abstract:
The present application relates to a direct-current circuit breaker, comprising: a transformer, a first switch, a second switch and a signal collection module, wherein a secondary winding of the transformer and the first switch are arranged on a power transmission line; a primary winding of the transformer is connected to an alternating-current power grid by means of the second switch; and the signal collection module is connected to the primary winding, the alternating-current power grid and the secondary winding, and collects a first voltage of the primary winding, a second voltage of the alternating-current power grid and the current of the secondary winding. When the power transmission line is in a normal operating state, the first switch is switched on, and the second switch is switched off; when the power transmission line is in a faulty state and the difference between the second voltage and the first voltage reaches a switch-off threshold value, the second switch is switched on; and when the current decreases and reaches a current threshold value, both the first switch and the second switch are switched off. Thus, energy of a faulty current can be transferred to the alternating-current power grid, and the faulty current is automatically suppressed at an early stage of a fault. The principle of disconnecting a fault point is simple and reliable; and a parallel structure that has a plurality of branches, and devices such as an arrester are not used, thereby reducing the complexity and maintenance difficulty of a device.

Inventors:
HE JINGSONG (CN)
PENG GUANGQIANG (CN)
WU JIYANG (CN)
WANG YUEYANG (CN)
MAO CHIZU (CN)
CHEN LIXIN (CN)
Application Number:
PCT/CN2021/105376
Publication Date:
December 01, 2022
Filing Date:
July 09, 2021
Export Citation:
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Assignee:
MAINTENANCE & TEST CENTRE CSG EHV POWER TRANS COMPANY (CN)
International Classes:
H02H7/26; H02J5/00
Foreign References:
CN103532088A2014-01-22
CN101566672A2009-10-28
CN107872060A2018-04-03
CN202663104U2013-01-09
CN101174771A2008-05-07
US20200295561A12020-09-17
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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