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

Claim 0:
1. 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, and detect the calculated first average voltage as a steady-state voltage according to whether a difference between the calculated first average voltage and a second average voltage calculated before the first average voltage is within a preset first error range, or update the sampling interval by applying a different time multiple according to the difference between the first average voltage and the second average voltage.