GE Multilin DFF, Инструкция по эксплуатации, Страница: 12 / 74

OPERATING PRINCIPLES
GEK-106166E DFF Digital Feeder Relay 11
STATUS AND ACTUAL VALUES
2.2.1 MEASUREMENT
The DFF provides measurement values for:
•
Three phase voltages
•
One ground voltage
•
Frequency
•
Rate of change of frequency
The DFF calculates the fundamental frequency RMS voltage phasor for each phase and for ground. Measurement
can be accessed through the local front display and from the
GE_LOCAL or DFFPC communications software. All
the values are affected by the external transformers´ ratio ( PHASE VT RATIO and GROUND VT RATIO defined in
GENERAL SETTINGS ).
2.2.2 TARGET LEDS
In the DFF, a total of 17 LEDs are available, one bicolor LED (red/green)for the internal alarm function plus 16 red
LED’s configured as the table shown below.
LEDs configured for trip indication (9 to 16) include a memory feature, and they remain lit until the user presses the
TARGET RESET button for 3 seconds .
The memory feature covers also for lost of Vdc auxiliary power.
There is a test facility for the LEDs, by pressing the TARGET RESET button for less than 3 seconds, all LED’s will be
lit without being reset.
The factory default configuration of the DFF is the following:
LED DESCRIPTION MEMORY LED DESCRIPTION MEMORY
1 Pickup L1 NO 9 Trip L1 YES
2 Pickup L2 NO 10 Trip L2 YES
3 Pickup L3 NO 11 Trip L3 YES
4 Pickup L4 NO 12 Trip L4 YES
5 Pickup L5 NO 13 Trip L5 YES
6 Pickup L6 NO 14 Trip L6 YES
7 Pickup L7 NO 15 Trip L7 YES
8 Pickup L8 NO 16 Trip L8 YES