地电位供电型电子式电流互感器的设计

针对目前普遍使用的激光供电型电子式电流互感器存在的问题,研究了一种地电位供电型电子式电流互感器,该互感器采用传统倒立式SF₆的绝缘结构,其主要特点是传感单元位于地电位侧,取消了光供电系统,采用空心线圈作为计量、保护的传感单元,将调制的电信号引到低压侧进行解调得到被测电流。文章对温度这一影响空心线圈性能的关键因素进行了仿真计算。研制的地电位供电型电子式电流互感器在国网电力科学研究院进行了型式试验,试验结果表明,研制的电子式电流互感器准确度达到了0.2S级要求。

Design of Electronic Current Transformer Supplied by A Ground Potential Power Source

According to the problems of the electronic current transformer（ECT） with laser energizing,this paper illustrates an ECT with the power source at the ground potential.Employing the insulation structure of the traditional transformer insulated by SF₆,the ECT has characteristics such as the sensing unit with an air-core coil for measurement and protection;transmitting the electrical signal to the signal processing unit at the ground potential;the optical power source being taken out and having effective reliability.Utilizing mathematical models,designations and emulations have been done to compute the influence of the ambient temperature.Tests have been done and the experimental results show that this ECT can meet the requirement of the 0.2s level in IEC60044-8.