一起在运电容器4次谐振破坏的典型案例

A Typical Case of Running Capacitor Destroyed by 4 Harmonic Resonance

电力系统自动故障记录,尤其是以微机为基础的故障录波装置已成为分析系统事故,特别是分析继电保护动作行为的重要依据。并联电容器装置是目前电网中使用最多的无功补偿装置,但在装置侧装设故障录波装置的寥寥无几。通过对一起并联电容器装置运行过程中发生的爆炸故障进行调查,利用故障录波图,对故障原因进行直观分析,并通过谐振验算进行佐证,提出建议并得出故障结论,说明在并联电容器装置侧安装故障录波装置对于并联电容器装置故障分析的重要性。

Automatic fault record of power system,in particular the PC-based fault recorder,has become an important evidence for analyzing the system accident,especially for analyzing the action of relay protection.The shunt capacitor device is the most widely used reactive power compensation device in the power network,but few fault recording devices are installed on the side of the device.Through investigating the explosion fault occurred on a running shunt capacitor device and by using fault oscillography,the cause of the malfunction is analyzed intuitively in this paper,which is verified by the resonance checking calculation;then some suggestions are put forward and fault conclusion is drawn.This demonstrates the importance of installing fault oscillograph on the side of the shunt capacitor device for facilitating fault analysis.