刘云鹏,王剑,赵涛.冲击电压下典型局部放电信号的光电检测系统[J].电测与仪表,2015,52(12):. LIU Yunpeng,WANG Jian,ZHAO Tao.Optoelectronic Partial Discharge Detection System under Impulse Voltage[J].Electrical Measurement & Instrumentation,2015,52(12):.
冲击电压下典型局部放电信号的光电检测系统
Optoelectronic Partial Discharge Detection System under Impulse Voltage
Partial discharge detection under impulse voltage is an effective method for monitoring the insulating properties and the aging of high-voltage electric equipment. It is of great practical significance for discovering potential safety hazard in time and ensuring the safe operation of equipment. To investigate the partial discharge characteristics of the gap in oil-paper insulation model under lighting impulse voltage, we adopt the optoelectronic techniques having high response characteristic. It has an advantage of measuring a partial discharges impulse current at the high-potential electrode with isolating the interference of the power source. It can obtain almost all the transient current flowing through the high-potential electrode and isolate the interference of the ground wire. Due to the fiber optic transmission, the system picks up less electromagnetic noise from the impulse generator. By concatenating a sampling resistor in the high-potential lead, the signal of current through the resistor is transmitted to the optical emitter. Finally, the photoelectric conversion device converts the light signal into the electrical signal which can be displayed on the oscilloscope. Experiment shows that the partial discharge intensity change dramatically with the increase of voltage. It verifies the feasibility of the optoelectronic techniques detecting PD under lighting impulse voltage.
