新型固体环网柜在线监测系统设计

Design of Online Monitoring System for Solid-insulated Ring Main Unit

针对固体环网柜绝缘在线监测问题,提出一种综合在线监测方案,同时监测母线温升、泄漏电流值和介质损耗值来反映固体环网柜绝缘状态。针对母线温升监测,采用取能电流互感器、温度传感器以及红外传输方式的配合,解决了对母线电连接处温升测量隔离的难题。同时监测泄漏电流值和介质损耗值,二者相结合作为绝缘状态的判据,并通过老化实验验证了各项参数判据值大小选取的合理性。最后,通过现场在线产品的测量表明,该装置满足测量的准确度和稳定性的要求,为固体环网柜绝缘在线监测提供参考。

For improving reliable operation of ring main unit（RMU） in power system, an approach for on-line monitoring the insulation characteristic and bus-bar temperature rising of the RMU is proposed. The bus-bar temperature monitoring system adopts draw-out current transformer, temperature sensor and infrared transmission to solve the problem of high voltage isolation. The leakage current and dielectric loss are monitored simultaneously to judge the insulation state, and insulation aging test is conducted to verify the rationality of the determination of the parameters values as criteria. In addition, online monitoring results verify the accuracy and reliability of the on-line monitoring system.