The digitally controlled KPM465x monitors insulation level between a non-live non-grounded (IT)  system and its protective earth. This unit is used for land, offshore and marine installations for megging of any standby equipment.

When running, the centrifugal force and heat of windings will keep a machine dry. When machines is not running ambient humidity may condensate and form moisture traps, which, together with accumulated dust and contaminated deposits, may form leakage paths to earth.

Idling operation interrupts general insulation monitoring and leaves machine insulation to degrade uncontrolled during a lasting outage.

KPM465x can be connected to any kind of non-live electrical system, to monitor the general health during inactive operation. KPM465x will also detect any earth fault caused by break-down and flash-over carbon deposits or mechanical damage to windings and cabling.

An AC or DC auxiliary voltage is required for the unit. Only ONE KPM465E can be connected to each IT-system.

The ohmmeter and the triple-zone status LEDs give at a glance the clear safety message:

• ALARM
• WARNING
• HEALTHY

IDV MEASURING PRINCIPLE
Insulation is measured between the complete galvanically interconnected AC network and its protective earth.

The unit injects a DC measuring signal into the monitored system. The signal flows to ground via the path of the insulation fault, the level of flow indicates the insulation resistance. The measuring accuracy is not influenced by spread capacitance.

The KPM465x measures all phases just by connection to either line or neutral point. Start of monitoring function is delayed when auxiliary power is switched on (default 10 secs delay) to avoid false reading caused by initial charging of network spread capacitance. If powered from separate source there can be a stabilizing time if there is network spread capacitance.