电磁干扰造成发电事故的一次典型分析

A Typical Analysis on Failure of Power Generation due to Electric-Magnetic Disturbance

随着大功率、超高压电气设备的应用,电磁干扰对电气保护装置的影响不可忽视。如果保护装置存在光耦及出口继电器功率偏低、二次电缆很长造成分布电容较大等问题,抗干扰能力较差,当远距离输电线路故障时,可能引发机组跳闸等设备事故。

At present, so long as the bigger power consumption as well as super-high voltage electrical equipments are so widely adopted, any negative impact caused by electrical disturbance, to which the electrical protect mechanisms are subject, should not be neglected any more. In case of low power rate of optical coupler and output relay being equipped within the protection system or mechanism, considerable distributed capacitance owing to much longer distance of protection cable exist. Due to all aspects mentioned above, the electrical protection system is of much lower immunity capability from electrical-magnetic disturbance. If there was a failure occurred upon the long distance transmission line, the power generation unit should possibly be tripped.