Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-12 973.334.3100
The logical outputs available are defined in the OrCAD logic and can be customized for your
application. A logic output can be mapped to a single physical output only, this is why some logic
signals are duplicated in the logic. If there is a need for more than two alarm or trip contacts, it can be
simply provided by a custom made logic for your needs.
The GARD 8000 System provides 20 user configurable LED’s. Each LED is tri-colored; red, yellow,
and green. Each color can individually represent a logic function. In case more than one color is active,
red will override yellow and green and yellow will override green.
The current differential relay logic also includes a block named ‘LED MAPPING SIGNALS’. These
signals are created for simple mapping to the front panel LED’s. Again, custom made logic can
provide other and/or more signals as required.
Each LED function can be given a label. The front panel label can also be custom made by a print-out
of the supplied template. While there is limited space for text on the front, the web page user labels can
contain up to 32 characters.
13.2.4.1 LOGIC SIGNALS AVAILABLE FROM THE CURRENT DIFFERENTIAL
MODULE
The Current Differential Module creates a number of logic signals from its measuring element and
protection logic. The GARD 8000 System logic uses these signals to perform trip and pilot scheme
operations. The default logic is bringing out some of the available signals, but all of the signals shown
in the logic diagrams are available for custom logic.
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