Insulation Monitor, System Voltage up to 6.6kV, with Non-Latching Output and Analog Output, Special for Frequency Converter Systems
Designed for non-grounded networks with Frequency Converters
Direct connection up to 690V line voltage, up to 6.6kV with HV adapter
Monitoring during both live and standby conditions
For use in land, marine and offshore Installations
“Megger” – safe to 1,4kVDC when aux power is OFF
Immune to earth capacitance and voltage surges
The digitally controlled KPM163xQ is designed to monitor the insulation level between a non-grounded (IT) AC mains and its protective earth in systems with frequency converters . The unit is for land, marine and offshore 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 inactive (standby) conditions. Only ONE KPM163xQ 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 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 any normal kind of load attached to the AC network.
This unit is used for any land, marine or offshore installations. Start of monitoring function is delayed when auxiliary power is switched on (default 10 secs delay). The unit has minimum of 9 seconds detection time for any insulation fault.
Trip levels and delays are settable on unit rear. 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.
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 The KPM163xQ has an isolated analogue output proportional to meter reading. If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.
The KPM163xQ range is designed to comply with specification AODC035 “Code of Practice for the Safe Use of Electricity Under Water” issued by IMCA.
High Voltage Adaptor for KPM163xQ
Voltage Adaptor is used for Insulation Guard KPM163xQ when the monitored line voltage is higher than 690VAC.
The adapter is a passive low-pass filter for use in 50, 60 or 400Hz networks, and is potted in polyurethane. The unit includes high inductance reactance modules, connected in a special configuration to avoid DC saturation.
Connection to the star-point (Neutral) is Preferable. The Adapter maintains a high AC suppression of its signal output to very low, safe levels, under all conditions. Alternative connections to the AC network.
INTELLIGENT SETTING ASSISTANCE
KPM163xQ has a built-in Assistance tool for setting/verification of the trip levels and the analogue output.
When either the Warning or Alarm potentiometer on the rear is operated by user, the meter goes into Assistance Mode and meter reading and analogue output will reflect the potentiometer setting.