Construction Principle and Application Test of 220kV Self-Healing Optical Voltage Sensor

In this paper, a self-healing optical voltage sensor (SOVS) based on the Pockels electro-optical effect and capacitive divider of BGO crystal is reported. A special design of automatic calibrating reference voltage source is used to solve the drift problem of measurement accuracy of an optical voltage sensor that was influenced by temperature. According to the mathematic models of capacitive divider and voltage sensors based on Pockels electro-optical effect, the real-time correction principle of sensing channel parameters is introduced, and the structure design of optical voltage sensor is given out. According to the IEC 60044-7 standard, the proposed optical voltage sensor is tested. The advantages of this voltage sensor in application and some testing records in a typical 220kV substation are introduced as well. The practical operation conclusion indicates the SOVS works stably, value of measurement is correct, and the configuration is good for extend in applications.