Since the CVT(Capacitor Voltage Transformer) is unable to transfer the high-frequency component of voltage travelling wave,the directional comparison pilot protection technology based on PCTDR(Polarized Current Travelling wave based Directional Relay) adopts the polarity relationship between the high-frequency component of current and low-frequency component of voltage to construct the directional relay. The PCTDR-based directional comparison pilot protection technology and the site application of correspon...