关于某核电站柴油发电机组电压不平衡的故障分析

Fault Analysis on Voltage Imbalance of Diesel Generator Set

柴油发电机组作为发电厂后备保障的重要一环,输出电压的质量直接影响其并网性能及其所带设备的运行工况。引起柴油发电机组电压不平衡的原因有很多,针对性地进行故障分析,合理利用排除法,有助于快速找到问题根源所在。通过某核电站柴油发电机组定子接地保护动作事故,对发电机本体、主电缆、电压互感器的自身特性和故障原因进行了深入分析,并通过建立等效电路方法进行了公式推导,从理论上确定了故障发生点,为今后此类故障的分析提供了参考。

As an important part of the backup guarantee of power plant,the quality of output voltage directly affects its grid connection performance and the operating conditions of its equipment.There are many reasons for the voltage imbalance of diesel generator set.Targeted fault analysis and rational use of trouble shooting methods will help to quickly find the root of the problem.Through the stator grounding protection action accident of diesel generator set in a nuclear power plant,this paper deeply analyzes the characteristics and fault causes of generator body,main cable and voltage transformer,deduces the formula by establishing the equivalent circuit method,and determines the fault occurrence point theoretically,which provides a reference for the analysis of such faults in the future.