Example application: Ungrounded power system insulation monitoring

You can use an IMD to monitor an ungrounded power system.

An ungrounded power system is a system involving the use of a transformer whose neutral is not connected to ground.

The insulation is monitored by an IMD having the following characteristics:

  • It is generally powered by the system that it monitors.

  • It is connected to neutral (or to one phase) and ground.

  • Its only setting is the fault threshold level. The preventive insulation alarm threshold can also be set.

  • It has a single relay output to a light or a buzzer.

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