Development of a Calibration Device for Transformer DC Resistance Testers
This paper analyzes shortcomings in calibration process of single-phase and three-phase transformer DC resist-ance testers,and designs a modified calibration device.It outlines circuit structure and working principle of the calibration device,and elaborates specific mechanism of adjusting impedance value of virtual resistance by controlling the duty ratio of PWM signal.
transformer DC resistancecurrent samplinganalog resistanceduty ratio
NETL
NSTL
万方数据
