Develop of on-line instrument for measuring the winding temperature-rise of AC machines

In this paper, the online method of measuring the temperature-rise of AC machine windings based on resistance method is discussed. The method utilizing a DC circuit composed of a constant source, winding resistance, and standard sampling resistance gets the value of winding resistance through measuring the relevant signals. Compared to the traditional methods, this method is more accurate, its structure is simpler, and it has other benefits.