GIS铁磁谐振故障分析及处理

Fault Analysis and Treatment of GIS Ferromagnetic Resonance

本文针对500 k V GISPT铁磁谐振故障展开分析,通过电容分压原理计算GIS对地电容值,并在此基础上扩大计算范围,同时考虑断路器并联电容值的偏差,开展主变高压侧T区短引线各个工况下铁磁谐振的仿真计算,验证GIS PT及消谐装置设计、选型是否合理。结合现场检测确认GIS铁磁谐振故障原因,并对后续电厂运维提出合理化建议。

This paper analyzes the fault of ferromagnetic resonance in 500kV GIS PT,calculates the capacitance value of GIS to ground through the principle of capacitive voltage division,and expands the calculation range on this basis.At the same time,considering the deviation of the parallel capacitance of circuit breakers,it carries out the simulation calculation of ferromagnetic resonance under various working conditions of the short lead in the T zone of the high voltage side of the main transformer to verify if the design and selection of GIS PT and harmonic elimination device are reasonable.The cause of GIS ferro resonance fault is confirmed by on-site detection,and reasonable suggestions are put forward for subsequent power plant operation and maintenance.