Application
The digitally controlled KPM163x 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 KPM163x can be connected to each IT-system.
The
ohmmeter and the triple-zone status LEDs give at a glance the clear
safety message:
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 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.
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 meter
reading. If output is used for remote meter reading, we recommend 0-1mA
for the slave indicator.
SAFETY
When a voltage adapter (CHx or ANx) is used the signal to terminals
4 and 6 on KPM163x is limited to a safe level, avoiding any
dangerous voltage exposure to personnel.
The KPM163x 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 EN 61010-1 Cat. III, Pollution degree 2 and the relevant environmental and EMC tests specified in EN 61326-2-4 to comply with the requirements of the major Classification Societies.
NOTE
Special versions of the KPM163x are available as:
KPM563x series
Insulation Guards with DC detection function, protected against high-energy DC voltage imposed on the monitored AC supply.
KPM263x series
Insulation Guards with measuring loop continuity monitoring.
INTELLIGENT SETTING ASSISTANCE
KPM163x 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.
This unit is used for marine, ROV and offshore installations. Start of
monitoring function is delayed when auxiliary power is switched on
(default 10 secs delay). The unit has minimum 150 mS detection time for
any insulation fault.
KPM163E2 & KPM163F2 - KPM163G2 & KPM163GF2
Scale range: 0-10MΩ - ∞ (>60MΩ)
This unit is used for marine, ROV and offshore installations. Start of
monitoring function is delayed when auxiliary power is switched on
(default 10 secs delay). The unit has minimum 150 mS detection time for
any insulation fault.
(Recommended for thruster standby monitoring)
KPM163H & KPM163HF - KPM163HG & KPM163HGF
Scale range: 0-10MΩ - ∞ (>60MΩ)
This unit is specifically designed for sub-sea monitoring and
includes the advanced
Load Distortion and Earth-capacitance Detector
(LDED).
The LDED function differentiates between a true (resistive) or a
false (capacitive) drop in insulation reading, and will maintain
reliable and accurate insulation monitoring even if load switching or a
major change in load spread capacitance cause meter indication to drop
below set relay trip levels.
This situation may occur due to the latent high RC product at the
high end part of the measuring range. The LDED will then momentarily
inhibit all monitoring functions, freeze operation of meter, lamp
display, alarm relays and analogue output for duration of a monitoring
irregularity.
The unit will restore normal operation at the moment meter
deflection rises above set alarm trip levels. The LDED function has
minimum 1 secs detection time for any insulation fault.
