弱输出电压传感器误差校验系统研制

目前一二次深度融合传感器在配网自动化领域不断深化推广应用,为实现弱输出交流传感器量值溯源并建立相应误差校验系统,本文以基于有源V/I转换原理的电容分压器作为标准器,并设计了精密电压匹配单元以解决标准器和弱输出传感器输出电压不匹配问题。通过设计多级屏蔽结构、二次串联升压线圈以及动态跟随反馈电路,实现精密电压匹配单元反相和比例分压功能。最终配合双通道高精度误差测量系统实现不同原理的弱输出电压传感器误差校验。

Development of error calibration system for weak output voltage sensor

At present, the primary and secondary deep fusion sensor apply in the field of distribution network automation more and more popularly. In order to realize the traceability of the weak output AC sensor and establish the corresponding error check system, the active capacitive voltage divider is developed as a standard device in this paper. A precision voltage matching unit is designed to solve the problem of voltage unmatching between the standard device and the sensor under test. Through the multi-stage shielding structure, secondary series boost coil and dynamic following feedback circuit, the inverse and proportional boost functions of precision voltage matching unit are realized. The error analysis and test are carried out by self-calibrating single-disk induction voltage divider. Finally, the error calibration of weak output voltage sensor is realized with active standard and error measurement system.