线路压变爆炸导致35kV变电站全站失电事故分析

Fault Analysis of 35kV Substation Power Losing Resulting from the Explosion of Voltage Transformer on the 35kV Line

针对某线路压变爆炸引起35kV变电站全站失电的电网事故,本文从监控信号、继电保护、辅助信息3个角度进行详细分析,综合探讨了事故发生原因:系统谐振引起压变绝缘降低击穿,线路保护动作切断故障,导致35kV变电站全站失电。最后,本文从优化电网运行方式、强化信号监控和限制、消除谐振3个角度提出了改进措施,以确保电网安全、稳定、可靠运行。

The paper analyzes the 35kV substation power failure from three aspects which include signal monitor, relay protection and supplementary information. The accident happens when the voltage transformer on the 35kV line explodes. Based the fact, we further make a comprehensive discussion about the cause： system resonance results in the decreased insulation. Meanwhile, the circuit breaker on the line trips after protection to cut the fault which leads to the whole substation power failure. To ensure that the power grid operates safely, stablely and reliably, this paper proposes some suggestions, such as optimizing the power grid operation mode, strengthening the signal monitor and limiting and eliminating the system resonance.