Impedance Measurement At High Voltage, Heavy Current At Industry Frequency

A Technology scheme about measuring impedence at the condition of high voltage, heavy current at industry frequency is brought forward in this paper, and the feasibility of the scheme is verified by the trials, either.The measuring principle which is applicable to this technology scheme - voltage vectorproportion method is adopted in the paper, after analyzing the principles, advantages and disadvantages of present impedence measuring methods. For the purpose of realizing the measurement on impedence at the condition of high voltage, heavy current at industry frequency, we have deeply researched on following key techniques: high accuracy voltage follower, virtual ground, high voltage following circuit, and finally make out actual circuits. The value range of current on the measured impedence is between 0.1 A and 100A, and that of voltage is between 0.1V and 220V.