Application of Electric Field Measurement Method in Electroscope for Ultra-high Voltage Appliances

This paper describes a novel method to detect the electrification state of ultra-high voltage transmission lines based on Electric Field Measurement Method, which involves measuring the electric field at points in the vicinity of transmission lines and computing the electric field strength at the same points according to charge simulation method. A power frequency electromagnetic field strength measurement system is developed, which adopts wireless transmission, and tests has been carried out to confirm its anti-interference feature. Tests have been carried out at a 750kV transformer substation, and results indicate that electrification state of power appliances can be confirmed by measuring the electric field strength at points 1.5-2.0m away from the ground, and three measuring points are enough for 750 kV voltage rating, distance between which and center point doesn't exceed 11 m.