基于快速开关的短路电流超标治理的研究

Research on the Governance of Short Circuit Current Exceeding Based on Fast Circuit Breakers

针对宁夏石嘴山供电公司部分变压器抗短路能力不足问题,从技术成熟度、经济效益、节能效果等角度出发,分析了串联限流电抗器、高阻抗变压器、直流偏磁电抗器、超导限流以及"爆炸开关"并联电抗器等限流方案及其实施效果,提出了基于快速开关的短路电流超标治理方案,在短路故障的第一次过零点串入电抗器实现限流,解决变压器抗短路能力不足的问题,同时实现限流电抗器零损耗、无压降运行。

Aiming at the problem of insufficient anti-short circuit capacity of some transformers of State Grid Ningxia Shizuishan power supply company, from the view of technical maturity, economic efficiency, energy saving effect, this paper analyzes the implementation effect of current limiting scheme, including series current limiting reactor, high impedance transformer, DC bias reactor, superconducting limiting current, explosive switch, large capacity high speed circuit breaker and shunt reactor. Meanwhile, a scheme of over standard treatment of short circuit current based on fast circuit breaker is proposed, which can solve the problem of insufficient anti-short circuit capacity by applying the reactor at the first zero crossing in the case of short-circuit fault to realize current limiting, realizing normal operation without loss and voltage drop of the current limiting reactor at the same time.