Description

KCM161x

Insulation Monitor, System Voltage up to 690VAC, Output Relays and Optional Analog Output

• Direct connection up to 690V line voltage, up to 1.4kV with HV adapter

• Monitoring during both live and standby conditions

• For use in land, marine, offshore, sub-sea and ocean floor Installations

• Triple-zone insulation monitoring

• Comply with AODC 035 Code of Practice

• “Megger” – safe to 1,4kVDC when aux power is OFF

• Immune to earth capacitance and voltage surges

• Analogue output proportional to meter reading (F-version)

• Optional slave indicator

Application
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:

• ALARM

• WARNING

• HEALTHY

General

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 AODC035 “Code of Practice for the Safe Use of Electricity Under Water” issued by IMCA.

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.