Study on Digital Voltage Instrument Transformer Calibrator Based on Principle of High Potential Difference Measurement
Feng Ping Pan, Jia Hu, Yong Xiao, Wei Ming Sun, Qiang Song, Qin Liang Meng, Ding Qu Zhang · Applied Mechanics and Materials · 2012
Digital instrument transformer calibrator is the key equipment which is applied to calibrate instrument transformers automatically. The instrument transformer based on principle of high potential difference measurement is suitable for calibration of voltage instrument transformer with high voltage and high accuracy, as it avoids being affected by additive error. This paper presents a plan for high precise instrument transformer calibrator based on principle of high potential difference measurement. On the basis of this design scheme, the technology of shielded input-signal wire, input-signal isolated amplification and shielded circuit is adopted to design the instrument transformer calibrator. The produced calibrator is able to fulfill the requirement of self-calibration of power voltage ratio standard due to its excellent performance with high accuracy and stability.