GE Multilin DFF Instruction Manual page 12

STATUS AND ACTUAL VALUES
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).
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
1 Pickup L1
2 Pickup L2
3 Pickup L3
4 Pickup L4
5 Pickup L5
6 Pickup L6
7 Pickup L7
8 Pickup L8
GEK-106166E
OPERATING PRINCIPLES
MEMORY LED
NO 9
NO 10
NO 11
NO 12
NO 13
NO 14
NO 15
NO 16
DFF Digital Feeder Relay
2.2.1 MEASUREMENT
DESCRIPTION
Trip L1
Trip L2
Trip L3
Trip L4
Trip L5
Trip L6
Trip L7
Trip L8
2.2.2 TARGET LEDS
MEMORY
YES
YES
YES
YES
YES
YES
YES
YES
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