大型变压器局部放电在线监测系统研究

Research on On-line PD Monitoring for Large Power Transformers

介绍一种大型变压器局部放电在线监测系统，它采用声－电联合监测方法，可连续监测大型变压器的局部放电。通过研究及采用各种抗干扰措施，有效地解决了现场的电磁干扰，提高了监测灵敏度；利用光纤传输系统实现主控室的上位机与现场测量系统之间的通信，增强了系统整体抗干扰能力及信号传输的可靠性；利用套管末屏住入法解决了视在放电量的现场在线标定问题。该系统已在庆春合心 ５００ ｋＶ变电站安全运行 ４ ａ，工作状况良好。

This paper introduces a partial discharge (PD) on-line monitoring system for large power transformers. By employing the acoustic-electric combined monitoring method, it can continuously monitor PD on large power transformers. Various anti-interference measures applied, such as communication between main control room and field measuring system through optical fiber transmission system can significantly enhance the overall anti-interference ability and signal transmission reliability. This system has so far been operated safely in Changchun Hexin 500 kV substation for 4 years and worked under good conditions.