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本文提供了一种由附加直流电源的漏电保护单元和旁路接地保护单元及零序功率选择性漏电保护单元和漏电闭锁单元组合而成的井下低压电网漏电保护系统。具有横向和纵向选择性漏电保护功能。为解决故障点被旁路自保的问题,采用电容代替旁路接地电阻,隔离附加直流,以快速解除对故障相的旁路。本系统在模拟电网中试验,各项性能指标均达到要求。
This paper provides a underground leakage protection system with additional DC power supply and bypass grounding protection unit and zero-sequence power-selective leakage protection unit and leakage lock unit combination of underground low-voltage power grid leakage protection system. With horizontal and vertical selective leakage protection. In order to solve the problem that the fault point is bypassed and self-protected, a capacitor instead of a bypass grounding resistor is used to isolate the additional DC to quickly remove the bypass of the fault phase. The system in the simulation test in the power grid, the performance indicators have reached the requirements.