KCM363x Series

 
KCM363x - THREE CHANNEL AC EARTH FAULT GUARD
  • For grounded or non-grounded live networks in land, marine and sub-sea installations
  • True r.m.s. measurement not affected by heavily distorted Waveforms
  • 3 Individual channels
  • Non-resitive earth current offset function
  • Restricted or Unrestricted earth fault detection
  • Highest up meter reading, Pathfinder function identifies channel trip
  • Up to two individual very fast analogue output signals (<50mS), (optional)
  • DIN96 Slave Indicator with full current scale (optional)
Description
The three channel digitally controlled KCM363x monitors up to three earth current channels in a non-grounded (IT) or grounded TN network and its protective earth. Unit can be used for either Restricted or Unrestricted earth fault detection. There is individual relay for alarm or trip of load breaker.

The unit reads the level of earth leakage directly in mA. The standard range is 0-150mA. Larger scale values are available, typically 500mA, 1A, 2A, 5A and 10A. The 3-channel KCM363x automatically locks the meter to read the highest of the three channels.

An AC or DC auxiliary voltage is required for the unit. Start of monitoring function is inhibited when auxiliary power is switched on (default 2secs delay). In this way false tripping during power up.

The meter status LEDs give at a glance the clear safety message:
  • ALARM
  • HEALTHY
General
RCD MEASURING PRINCIPLE
Earth current is measured by a IG-transformers CBCT (Core Balance Current Transformer). The measuring technique is based on the principle that the sum of the phase currents in a fault free circuit is zero. If an earth fault present, the sum of the phase currents is not zero. This current differential produces a signal from the IG transformer, which is proportional to the earth current. All loaded wires shall go through the CBCT.

OUTPUTS
Up to two individual very fast analogue output signals (optional) proportional to meter reading. If output is used for remote meter reading, we recommend 0-1mA for the slave indicator.

The unit has C/O relay outputs for Alarm/trip. All 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. Offset, trip levels and delay are settable on unit front. The trip delay is common for all 3 channels.

OFFSET FUNCTION
Only the resistive (ohmic) earth leakage current is a measure for the insulation condition between the AC supply and its protective earth. Any reading of leakage current in a fault free network will be caused by the networks spread capacitance. An offset potentiometer on the rear allows normal reactive (capacitive) currents to be ignored.

Models
KCM363E
KCM363FA  
KCM363FB
KCM363G
KCM363GFA
KCM363GFB
 
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