Patent ID: 11892495
Assignee: LS ELECTRIC CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G  H

Claim 4:
5. The insulation monitoring device of claim 1, wherein the control unit is configured to:
control the signal generation unit, the signal measurement unit, and the average voltage calculation unit to check whether a preset number of insulation resistance values are calculated, and calculate the insulation resistance value again when the insulation resistance values less than the preset number are calculated, and
calculate an average value of the calculated insulation resistance values so as to determine a final value of the insulation resistance when the preset number of insulation resistance values are calculated as a result of the check, control the signal generation unit, the signal measurement unit, and the average voltage calculation unit to calculate a difference between the calculated insulation resistance values when the preset number of insulation resistance values are calculated, change a noise frequency according to a preset ratio when the calculated difference exceeds a preset threshold value, and calculate the preset number of insulation resistance values again according to the changed noise frequency, and
wherein the control unit is configured to:
check whether a period of the noise frequency is less than a preset minimum value when the final value of the insulation resistance is finally determined based on an average value of the preset number of insulation resistance values, and
determine the period of the noise frequency as the minimum value when the period of the noise frequency is less than the preset minimum value.