The digitally controlled KCM161x series monitors insulation level
between a non-grounded (IT) AC mains and its protective earth,
regardless of whether the mains is live or non-live (standby). The unit
is for land, marine, offshore, sub-sea and ocean floor use.
An AC or DC auxiliary voltage is required for the unit, if powered from a
separate source the network can also be monitored during standby
conditions. Only ONE KCM161x can be connected to each IT-system.
The
ohmmeter and the triple-zone status LEDs give at a glance the clear
safety message:
IDV MEASURING PRINCIPLE
Insulation is measured between the complete galvanically
interconnected AC network and its protective earth.
The unit injects a
sequentially coded 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 any normal kind of load attached to the AC network.
Trip levels and delays are settable on unit front. A trip LED flashes
when the trip level is passed, the relay trips when the delay has
elapsed. The timer resets if the fault is removed during countdown.
MEGGER SAFE
When auxiliary power is OFF the unit input is automatically
protected against "megger" test voltages up to 1.4kVDC, and incorrect
measurements caused by the unit’s input impedance are avoided.
OUTPUTS
All F versions have an isolated analogue output proportional to
insulation level. If output is used for remote meter reading, we
recommend 0-1mA for the slave indicator.
SAFETY
The KCM161x range is designed to comply with specification IMCA D 045 "Code of Practice for the Safe Use of Electricity Under Water" issued by IMCA.
The unit meets IEC60092-504 and the relevant environmental and EMC tests specified in IEC60068/60092 and IEC61000/60533 respectively, to comply with the requirements of the major Classification Societies.
NOTE
Special versions of the KCM161x are available as:
KCM161xM series
Insulation guard with DC detection function, protected against high-energy DC voltage imposed on the monitored AC supply.
KCM261x series
Insulation Guards with measuring loop continuity monitoring.
INTELLIGENT SETTING ASSISTANCE
KCM161x has a built-in Assistance tool for setting/verification of the trip levels and the analogue output.
When either the Warning or Alarm potmeter on the front is operated
by user, the slave meter goes into Assistance Mode and meter reading and
analogue output will reflect the potmeter setting.
Reset / Parallelling Disable Function
KCM161x has a built-in disable function (available only when DC Aux. Supply is applied). When connecting two or more IT-networks together only one unit can be active, the other(s) must be disabled. When unit is disabled the power led will flash every 2 seconds to indicate that unit is inactive.
