HIGH VOLTAGE INSULATION MONITORING DEVICE AND HIGH VOLTAGE INSULATION MONITORING METHOD

摘要

To provide a high voltage insulation monitoring device and a high voltage insulation monitoring method, which are capable of correcting an error of a zero-phase current even in a switch comprising only a current transformer of two phases, and capable of highly precisely detecting insulation deterioration.SOLUTION: A representative configuration of a high voltage insulation monitoring device 10 is connected to a switch comprising a zero-phase current transformer 24 for detecting zero-phase current and a current transformer 26 for detecting load current of at least two phases in three phases, and detects insulation deterioration of a high-voltage distribution line. The high voltage insulation monitoring device 10 comprises a correction section 36 for correcting the zero-pase current so that an error of the zero-phase current due to influence of load current is suppressed by using characteristics of the current transformer 26 and the zero-phase current transformer 24. The correction section 36 corrects the error of the zero-phase current from the load current obtained from the two-phase current transformer 26 by assuming that the zero-phase current is so small as to be ignored with respect to the phase current.SELECTED DRAWING: Figure 1