| 摘要 |
PCT No. PCT/JP82/00251 Sec. 371 Date Aug. 4, 1983 Sec. 102(e) Date Aug. 4, 1983 PCT Filed Jul. 1, 1982.A method and device for measuring or detecting insulation resistance of an electric line in an operating state is disclosed. At least two low frequency measuring signals of mutually different frequencies are applied to the electric line by electromagnetic induction or series coupling, and the insulation condition of the electric line is measured by detecting the effective values of the low frequency measuring signals having returned to the earthline for each frequency. When the two effective component values coincide, those values are taken as a measured value of insulation resistance, while when the values do not coincide, the effective component values are detected using at least one low frequency voltage of further different frequency, the insulation resistance of the electric line is calculated based on a plurality of those detected values, whereby not only the insulation resistance of the circuit to be equivalently represented by a parallel circuit of resistance and capacitance, but also the presence and further value of insulation deterioration to be equivalently represented by a series circuit of resistance and capacitance, can be calculated.
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