作　　者： ; ; ;

机构地区： 华南理工大学

出　　处： 《高压电器》 2009年第5期73-76,79,共5页

摘　　要： 并联电容器组是交流电力系统输配电环节的主要无功补偿装置,在变电站中普遍采用10 kV框架式高压并联电力电容器组。实际运行中,电容器内部元件击穿的故障是电容器组故障比例最高的。以常用的10 kV并联电容器为研究对象,分析了电容器组在运行过程中内部元件击穿一串、二串情况的击穿放电量,故障相电容器的电压暂态变化量,并估计了放电电流的峰值。在EMTP仿真软件中建立了电容器的击穿模型,计算并分析了击穿元件的等效电路参数对放电电流峰值的影响:电阻值越大,则击穿峰值电流越小,随着电阻值的增加,击穿电流峰值下降减缓。最后,将仿真分析与电容器击穿的故障记录进行对比分析,验证了理论分析的正确性和仿真的有效性,为电容器击穿的实时监测和快速定位提供参考。 Shunt capacitor bank is the major reactive power compensation devices in AC power transmission and distribution system, 10 kV frame type high voltage shunt power capacitor bank is commonly used in substation. During the practical operation, the breakdown fault of capacitor internal component is the highest ratio shunt capacitor bank faults. In this paper, according to the widely using 10 kV shunt capacitor, it is analyzed the breakdown discharge quantity during the first serial and second serial capacitor internal component breakdown in the operating shunt capacitor bank. Also, it is calculated the change of breakdown transient voltage, and estimated the peak value of discharge current. The capacitor component breakdown model is built in the EMTP, therefore, it is analyzed the discharge current peak value influenced by the equivalent circuit parameter of the breakdown model. At the end, the comparison is given between the simulation result and the fault record data of the shunt capacitor bank. It is certified that the correction of the breakdown analysis and validity of breakdown simulation. The analysis result could help the real-time supervision and fast location of the fault capacitor.

关 键 词： 并联电容器组 电容元件击穿 放电量 仿真模型 放电电流 故障记录

领　　域： [电气工程] [自动化与计算机技术] [自动化与计算机技术]