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.
OUTPUTS
The unit has C/O relay outputs for Warning and Alarm. The Alarm relays are fail to safety configured. 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. Trip levels and delays are settable on unit rear.
All F versions have an isolated analogue output proportional to meter
reading. If output is used for remote meter reading, we recommend 0-1mA
for the slave indicator.
SAFETY
The unit is megger safe but megger will measure the internal resistance of approximately 1,7Mohm if unit is connected. The unit is not for live measuring but will not be damaged if network voltage is accidentally connected.
The KPM465x range is designed to comply with specification IMCA D 045 “Code of Practice for the Safe Use of Electricity Under Water” issued by IMCA.
INTELLIGENT SETTING ASSISTANCE
KPM465x 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 rear is operated by
user, the meter goes into
Assistance Mode and meter reading and analogue
output will reflect the potmeter setting.
KPM165H & KPM465HF - KPM465HG & KPM465HGF
Scale range: 10kΩ - 500MΩ - ∞ (>2GΩ)
KPM465G & KPM465GF - KPM465L & KPM465LF
Scale range: 500kΩ - 5GΩ - ∞ (>6GΩ)
KPM465E & KPM465F - KPM465N & KPM465NF
Scale range: 15MΩ - 10GΩ - ∞ (>12GΩ)