某电厂电压互感器铁磁谐振案例的分析及对策

Analysis and Countermeasures of Voltage Transformer Ferromagnetic Resonance Case in a Hydropower Plant

文章介绍了一起某电厂主变压器倒挂运行时,电压互感器发生分频谐振,导致主变压器低压侧开口三角电压报警动作的案例。结合现场检查处理情况,对铁磁谐振的原理进行了分析,并根据现场实际情况提出了变更运行方式、装设消谐电阻及消谐装置等应对措施。

This paper introduces a case of voltage transformer frequency division resonance occurring when the main transformer is running upside down in a hydropower plant,which leads to the voltage alarm of the open-delta connection in main transformer lowvoltage side.The principle of ferromagnetic resonance is analyzed in combination with the on-site inspection and treatment,some countermeasures are put forward according to the actual situation,such as changing the operation mode,installing the harmonic elimination resistor and the harmonic elimination device.