Insulation alarm and preventive insulation alarm threshold hysteresis

A hysteresis is applied to limit the error in the insulation alarm due to fluctuations in the measurement when approaching threshold value.

A hysteresis principle is applied:

  • When the insulation value measured decreases and falls below the setting threshold, the insulation alarm or preventive insulation alarm is triggered or the countdown is started if an insulation alarm time delay has been set.

  • When the insulation value measured increases and exceeds 1.2 times the set threshold (i.e. the setting threshold +20%), the insulation alarm or the preventive insulation alarm is deactivated.

The following diagrams show the behaviors:

  • Without hysteresis:

  • With hysteresis:

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