Strategy and implementation of controlled reclosing: harmless reclosing
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ORIGINAL PAPER
Strategy and implementation of controlled reclosing: harmless reclosing Zhihui Huang1,2
· Kai Wang1 · Yongxing Wang1 · Lin Zou1,3 · Jiyan Zou1,3
Received: 10 October 2018 / Accepted: 9 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This paper describes a new technique named controlled reclosing in which the peak value and duration time of reclosing current can be controlled to reduce the enormous pressure to power system when reclosing in permanent fault. Based on the analysis to the reclosing current in different voltage phase angles and a fast estimation algorithm for current parameters, a new reclosing strategy named controlled reclosing was proposed in which fault phases were reclosed in turn in optimum voltage phase angle, and the periodic component amplitude of reclosing current was calculated in a very short time and compared with a setting value to find earth fault; and the pair combinations in fault phases were reclosed synchronously in turn in optimum line-to-line voltage phase angle to find the phase-to-phase fault. A new implementation for controlled reclosing using triggered vacuum switch or power electronics switch was proposed. The simulation results showed that the proposed strategy can reduce the peak value and duration time of reclosing current and determined the fault type. Keywords Controlled reclosing · Triggered vacuum switch · Fault type identification · Fault parameters estimation · Controlled switching
1 Introduction With the rapid development of power system in China, the capacity of short circuit has been constantly refreshing and the maximum short-circuit current was increasing significantly; then, it will generate enormous fault current rush to power system when reclosing at permanent fault. But if there is no reclosing after fault, the instantaneous fault will be treated as permanent fault, and as we know, the occurred faults are mostly instantaneous fault. It will no doubt increase the outage rate and duration which will bring a great loss to industry, traffic and so on. If the current peak value when reclosing at permanent fault can be reduced, the pressure to power system will be reduced. Then, more reclosing operation can be allowed after fault, and it will be more reliable identification to the fault type to
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Zhihui Huang [email protected]
1
School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
2
Pearl Electric Co., Ltd, Guangzhou, China
3
China Southern Power Grid Research Institute Co., Ltd, Guangzhou, China
achieve a lower outage rate and less power cut duration, so it will improve the quality and reliability of power system using a harmless reclosing. In order to control the reclosing current, this paper tried to apply the theory of controlled switching that the line was closed at appropriate relative voltage phase and then quickly interrupted in several milliseconds to accomplish reclosing. According to the reclosing voltage and current, it can be determined whether the
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