KPC112x - AC GENERATOR CURRENT DIFFERENTIAL GUARD
- Generator Stator earth fault Protection
- Winding insulation Protection
- "Pathfinder" function eases faultfinding
- For use with 1A or 5A current transformers
- Fast analogue mA output (F version)
- Total processing time less than 50mS
Description
KPC112E protects against phase-, earth- and winding faults within the
protected area (the stator) of large AC generators. It detects even
minute insulation punctures, flash-over carbon deposits and
contamination.
The unit measures highest up differential current from
antiparallelled CTs in a Merz-Price configuration, by comparing current
levels at the end of each phase winding..
R1 is used for early warning. R2 or R3 (fail safe) is to be used for
generator breaker trip, the "other" alarm relay can be used for local
indication input to PMS, alarm system etc.
Alarm trip must be set sufficiently high to ensure that generator
magnetisation current does not cause tripping. The alarm delay is to be
set so that the initial inrush current have returned to normal level
before the delay period elapses. The warning trip level and delay can be
set as required to give early warning.
User settable trip levels and delays. Colour of LEDs indicates
alarm status. LEDs flash during count-down. The meter and the
triple-zone status LEDs at a glance gives the clear safety message:
Fast response analogue output signal proportional to highest up current (KPC112F).
The "Pathfinder" function identifies the phase(s) causing the trip by the flashing pattern of the relevant LED(s).
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.
