应用于断路器中的光供电式空心电流互感器

介绍了一种应用于断路器中的光供电式空心电流互感器的原理、结构及性能。提出采用光纤在高、低压侧间传送测量信号及其高压侧所需要的能量,绝缘结构相对简单,将空心电流互感器组合在断路器中可减小设备占地面积和体积。所研制的电流互感器采用基于印刷电路板的空心线圈的结构,线圈二次绕组无需手工绕制和电阻调整;并对额定电流20 A,300 A及3 000 A的样机分别进行了测试,结果表明该系列电流互感器计量准确度均达到0.2S级,保护准确度为5P20。

Optically Powered Air Core Current Transformer for Application in Circuit Breaker

Optically powered air core current transformer applied in circuit breaker is reported in several aspects including the theory,the structure and the properties.By using the optical fiber,the signals are transmitted between the high voltage side and ground,and source power is supplied to high voltage side.The insulation structure of current transformer is comparatively simple,and the area and cubicle occupied by the facility will decrease while the air-core current transformer is combined with the breaker.Without hand-making and resistance adjustment,a new structure of air-core coil,based on printed circuit boards,is adopted by the transformer.Type test results show that when the rated current varies from 20 A to 3 000 A,the accuracy of air core current transformer meets 0.2S class for metering and 5P20 for protection.