变压器直流电阻测试仪校准装置的研制

Development of a Calibration Device for Transformer DC Resistance Testers

分析了目前单、三相变压器直流电阻测试仪校准过程中的不足,设计了变压器直流电阻测试仪校准装置。该装置采用模拟电阻方法实现对变压器直流电阻测试仪的校准。介绍了校准装置的电路结构及工作原理,重点阐述了通过控制PWM信号占空比值来调整模拟电阻的机理。

This paper analyzes shortcomings in calibration process of single-phase and three-phase transformer DC resistance 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.