电容式电压互感器的误差原因及解决方法

Error Cause and Soltuion of Capactitive Voltage Transformer

在高压电力系统中,为了提高电压互感器的测量准确度,必须减小误差。对于电容式电压互感器,通常采用补偿电感、降低补偿电感的阻抗,降低流过补偿电感的负载电流等方法来减小测量误差,但是互感器因存在铁芯线圈,在发生过电压或短路时,由于铁芯饱和使波形畸变,使测量精度大大降低,因此要重视电压互感器误差的影响。

In high voltage power system,in order to raise measurement accuracy,errors must be reduced. For capactive voltage transformers, compensating inductance is usually adoped to reduce impedance of the compensting inductance and load current flowing compensation inductance to reduce the measuring errors. But there is a magnet coil in the transformer,overvoltage or short circuit occurs,the magnet coil saturation makes waveform distortion,reduce measuring accuracy greatly,thus the effect of voltage trausformer errors must be paid attention to.