【摘要】 分析了不接地系统两相经过渡电阻接地,非故障相电压升高,产生电弧接地过电压,激发铁磁谐振的复故障过程特征。基于故障数据,采用相量分析方法,对某500kV变电站35kV互感器爆炸事故进行了快速的故障定位分析和判定,提出了有效的防范措施。现场实践证明了该方法的简捷有效性,对变电站快速诊断事故及进行有效的防范具有一定的参考意义。更多还原

【Abstract】 This paper deals with the process of a multiple fault occuring on non-earthed neutral system, which originates from two-phase grounding fault and non-fault phase voltage rising simultaneously, thus causing arc-grounding overvoltage and probably driving the voltage transformer saturated, resulting in ferro-resonance. In this paper, based on actual fault wave-form recorded data on a 500 kV substation and phasor analysis, the type of the fault and the causes of 35kV PT explosion are analyzed in a quite clear and effective way. Furthermore, measures are proposed to prevent such faults. Fault investigation on the spot shows that the analysis in this paper is valid and enables substation operator to identify such faults quickly and avoid serious consequences.更多还原