| 摘要 |
PURPOSE:To provide an insulation diagnosing device for electrical facilities with which a deteriorated part can be specified. CONSTITUTION:An insulation diagnosing device is constituted of an arithmetic processing section 19 which inputs the outputs of zero-phase current transformers 14 connected to feeders 12 branched from a bus constituting an electric power system to a band-pass filter 18 and an intermittently arc-grounding high-frequency current to a frequency detecting means 22, calculates an intermittently arc-ground point from a detected frequency and the constant of the electric power system, and finds the feeder having the highest output value by comparing the multiple outputs of the filter 18 with each other. Since the section 19 always compares the output of the filter 18 with numerical values in (n) stages, an intermittently arcing ground point can be always specified and insulation diagnosis can be always performed. |
