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

Claim 2:
3. The insulation monitoring device of claim 1, further comprising a memory configured to store information related to different sampling intervals corresponding to a plurality of different time constants, respectively,
wherein the control unit is configured to:
calculate a first sampling interval according to one of an initial value calculated according to internal resistance of the insulation monitoring device, and a period of a preset noise frequency, which is greater than another,
determine a plurality of interval determination time points for calculating a slope of a voltage measured by the signal measurement unit based on the first sampling interval,
calculate a ratio between a first slope according to a voltage difference between interval determination time points including a plurality of first sampling intervals and a second slope according to a voltage difference between other interval determination time points including the plurality of first sampling intervals, and
determine one of the different sampling intervals as the initial sampling interval based on a time constant corresponding to the calculated slope ratio.