张秋雁,李鹏程,肖监,欧家祥,张志.电子式互感器数字输出校验系统的研究[J].电测与仪表,2012,49(1):45-48,96. ZHANG Qiu-yan , LI Peng-cheng , XIAO Jian , OU Jia-xiang , ZHANG Zhi.An All-digital and High-accuracy System for Calibration of Electronic Transformers with Digital Output[J].Electrical Measurement & Instrumentation,2012,49(1):45-48,96.
电子式互感器数字输出校验系统的研究
An All-digital and High-accuracy System for Calibration of Electronic Transformers with Digital Output
Normally,calibration system of electronic transformers with digital output which includes construction of standard channel,digital processing of analog output signal of standard channel,receives the digital output of MU synchronous and error calculation.In this paper,an all-digital calibration system with digital output based on PCI high-accuracy DAQ card is proposed considering the factors influencing accuracy.Precision and dynamic range are guaranteed by A/D converter with 24 resolution and synchronization error limit is nanosecond by using the novelty synchronization method.Inaddition,an error correction algorithm based on the two-order Hanning convolution window has good inhibition of frequency fluctuation and inter-harmonics interference.Error calibration was carried out in the State Grid Electric Power Research Institute of China and results show that the proposed system can reach the precision class up to 0.05.