电力变压器直流电阻测量方法分析

Analysis of Measurement Methods for DC Resistance of Power Transformer

从变压器直流电阻测量原理出发,通过对具体电路的探究和对检测理论的推导,分析并总结了各类测量方式的特点以及缩短测量时间的方法。以某水电厂3号主变为例进行现场测量,结果表明助磁法较传统方法优势明显,提高了测量效率。

Starting from the principle of transformer DC resistance measurement,through the exploration of specific circuits and the derivation of the detection theory,the characteristics of various measurement methods and methods to shorten the measurement time are analyzed and summarized.Taking the No.3 main transformer of a hydroelectric power plant as an example,on-site measurement is carried out.The measured results show that the magnetic assist method has obvious advantages over the traditional method and improves the measurement efficiency.