Development of On-Line Partial Discharge Measuring System for Insulation Diagnosis of High-Voltage Motor Stator Windings

고압 전동기 고정자 권선의 절연진단을 위한 운전중 부분방전 측정 시스템 개발

In this paper, a new on-line high-voltage motor monitoring system is proposed. This system monitors the insulation condition of the stator winding by on-line measurements of partial discharge (PD). And this system displays magnitude and phase angle distribution of PD. Sensor, CC (Ceramic Coupler) is used for PD measurement. PD signals are continuously measured and digitized with a A/D converter to build the database of the high-voltage motor's insulation condition. Also, this system can communicate with the central monitoring system via RS-232, 422, and TCP/IP. This helps more efficient operation and maintenance of the high-voltage motor.