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)
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:
Assignee:
MAINTENANCE & TEST CENTRE CSG EHV POWER TRANS COMPANY (CN)
International Classes:
H02H7/26; H02J5/00
Foreign References:
CN103532088A | 2014-01-22 | |||
CN101566672A | 2009-10-28 | |||
CN107872060A | 2018-04-03 | |||
CN202663104U | 2013-01-09 | |||
CN101174771A | 2008-05-07 | |||
US20200295561A1 | 2020-09-17 |
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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