高压厂用电机零序保护异常分析及整定计算

Abnormal Analysis and Setting Calculation of Zero Sequence Protection of High-Voltage Auxiliary Motor

基于一起高压厂用电机零序保护异常缺陷,先介绍供电系统中零序电流的分析计算,然后结合现场检查,对异常原因进行调查,最后根据实际电缆电容值进行电机零序保护整定值计算、灵敏性校验,以提高6 kV厂用电供电系统可靠性。

An abnormal defect of zero sequence protection for high voltage auxiliary motor is introduced. Firstly, the analysis and calculation of zero sequence current in power supply system are introduced. Then, combined with the on-site inspection, the abnormal causes are investigated. Finally, according to the actual cable capacitance value, the setting value of motor zero sequence protection is calculated and the sensitivity is verified, so as to improve the reliability of 6 kV auxiliary power supply system.