李晓辉,李磊,邹琪,刘小琛,杨光,朱重冶.抗直流电流互感器校验仪检定方法研究[J].电测与仪表,2019,56(22):131-138. Li Xiaohui,Li Lei,Zou Qi,Liu Xiaochen,YangGuang,Zhu Chongye.Research on verification method of anti-DC current transformer calibrator[J].Electrical Measurement & Instrumentation,2019,56(22):131-138.
抗直流电流互感器校验仪检定方法研究
Research on verification method of anti-DC current transformer calibrator
At present, there is no professional calibration equipment for the calibration of anti-DC current transformer in China, except that the accuracy measurement of the calibrator under the condition of sinusoidal full-wave current signal can be transmitted by the overall calibration method. In this paper, an integrated calibration technology of anti-DC transformer calibrator which can satisfy three test conditions of sinusoidal full-wave, full-band direct current and sinusoidal half-wave is proposed. The working principle and error model of anti-DC transformer calibrator are analyzed. In particular, the calibration method of the calibrator under sinusoidal half-wave working current is studied in detail, and the dual-channel core module of the device is introduced. The working mechanism and signal flow of the program-controlled signal source are analyzed. The key harmonic components and the output current accuracy and stability under various error conditions are measured and verified by the third-party testing equipment. The possible uncertainty of the device is analyzed. The measurement results show that the overall verification technology proposed in this paper achieves the desired results and is of great significance for improving the current measurement system of anti-DC transformers.
