感应分流器反馈电子补偿模块设计

Design of compensation module of induction current divider

作为一种高准确度和高稳定性的电流比例标准,感应分流器常被高效运用于电流互感器的检定以及电流比较仪的量程扩展之中,同时适用于工频小电流量值溯源。在此背景下,提高感应分流器的测量准确度就显得十分必要。分析了感应分流器的模型和误差.研究和借鉴了互感器的误差特性和补偿方法,运用反馈补偿的原理设计了一种有源电子补偿模块,并对感应分流器进行误差补偿。实验证明此种电子补偿方法能够将感应分流器的测量准确度提高到10^-6量级,并且在实测中具有良好的负载特性。

As a standard current proportion with high accuracy and stability,induction current divider is often used in calibrating current transformer and measuring range expansion of current comparator.It is also suitable for power frequency and small current magnitude traceability.With this background,it is very necessary to improve the measurement accuracy of induction current divider.In this paper,the model and error of induction divider are analyzed and the error characteristics and compensation method of inductor are studied and used for reference.Therefore,an active electronic compensation module is designed based on the principle of feedback compensation to compensate the inductor error.The experimental results show that the electronic compensation method can improve the measuring accuracy of the induction current divider to be 10^-6,and this method has good load characteristics in the actual test.