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

Claim 15:
16. An insulation monitoring device comprising insulation resistance disposed between an electric line of a system and a ground, the device comprising:
a signal generation unit configured to apply a pulse signal having a voltage of a predetermined magnitude to the electric line;
a signal measurement unit connected to the ground and configured to measure a voltage of the pulse signal applied from the ground when the pulse signal applied to the electric line is applied to the ground through the insulation resistance;
an average voltage calculation unit configured to calculate an average voltage of voltages measured by the signal measurement unit during a sampling period according to a set sampling interval; and
a control unit configured to calculate a sampling interval based on an initial sampling interval and a preset time multiple, calculate an average voltage as a first average voltage during a sampling period according to the calculated sampling interval, performing a tuning process for calculating a difference between the calculated first average voltage and a second average voltage calculated before the first average voltage, and detect the first average voltage as a steady-state voltage when the difference between the average voltages satisfies a preset steady voltage error,
wherein the control unit switches an operation state into a power saving mode for a preset idle time when the difference between the first average voltage and the second average voltage satisfies a preset error condition, and resumes a tuning process of detecting the steady-state voltage by calculating the average voltages when the idle time elapses.