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

Claim 6:
7. 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 comparing the calculated first average voltage with a second average voltage calculated before the first average voltage, and detect the second average voltage as a steady-state voltage according to whether a time elapsed from a sampling starting time point is a predetermined time or longer when the difference between the average voltages is within a preset error range, or re-performing the tuning process.