电子式互感器配置问题探讨

针对数字化变电站建设中电子式互感器的配置问题,分析了设备的物理模型、测量品质、功率消耗、抗干扰能力和经济性等因素,提出110 kV及以上电压等级宜选用无源式电子式电流互感器和电容分压型电子式电压互感器,66 kV及以下电压等级宜选用有源式电子式电流互感器和电阻分压型电子式电压互感器;结合传统互感器的配置原则,论述了电子式互感器按间隔的配置方式并给出参考方案;鉴于已投运站点中出现的问题,建议根据不同间隔对电子式互感器选型并考虑一定的冗余配置,有助于实现数字化变电站的"弱故障化".

Configuration of electronic transformers

For the configuration of electronic transformer in digital substation,its influencing factors are analyzed, such as the physical model, measuring quality, power consumption, anti-interference ability, economy, etc. It is advised that,110 kV and higher voltage class should apply the optical current transformer and capacitor-divider electronic voltage transformer,and 66 kV and lower voltage class should apply the electronic current transformer and resistor-divider electronic voltage transformer. Combined with the configuration principles for conventional transformer,the configuration principles for electronic transformer by different bays are presented with a reference scheme. Aiming at the existing problems of operating substations,it is recom-mended that,to lower the fault rate of digital substation,the electronic transformer should be selected according to bays and configured with a certain redundancy.