智能变电站电子式互感器故障分析及建议

Analysis and Proposition for Malfunction of Electronic Transformer in Intelligent Substation

电子式互感器是智能电网、数字化变电站的重要设备,其制造、运行及故障检修经验仍然不足。某变电站数字化改造3年后,部分电子式电压互感器二次电压值不稳定,电子式电流互感器二次电流值出现明显偏差。介绍了电子式互感器系统原理、设备结构,分析了设备异常、故障原因,进行了解体研究及实验验证。发现设备参数影响红外测温结果,电压互感器取能线圈短路可造成电压下降,电流互感器并联电阻开路可造成电流激增。最后对电子式互感器的设计制造、质量控制及运行维护提出了几点建议。

Electronic transformer is very important in smart grid and digital substation. However, experience of manufacturing, operation and corrective maintenance of electronic transformer is still insufficient. After 3 years operation in one intelligent substation, secondary voltages of partial electronic voltage transformers are unstable and secondary currents of partial electronic current transformers has obvious deviation. The structures and principles for electronic transformers system are introduced; the malfunction reasons of equipment are analyzed and studied. It is found that equipment parameters may influence infrared temperature measurement results, shorted energy coil of voltage transformer leads to voltage drop and opening circuit of parallel resistance of current transformer results in eurrent increase. Several suggestions are proposed for design, manufacture, quality control and maintenance of electronic transformers.