GE DFF1000 Series, Instructions Manual, Page: 15 / 59

GEK – 106166B
12
2.3 MONITORING AND REGISTERING FUNCTIONS
2.3.1 MEASUREMENT
The DFF provides measurement values for the following magnitudes:
•
Three phase and ground voltages
•
Frequency
•
Frequency change rate over time
The DFF calculates RMS values for each phase. Measurement can be accessed through the local front display or
also from the GE_LOCAL communications software under the measurement screen. All the values are affected
by the external transformers´ ratio (PT PHASE RATIO and PT GROUND RATIO defined in the General Settings
Category).
2.3.2 LED SIGNALIZATION
The relay status provides information about all units inside the equipment (inputs, pickups, alarms, etc.). The
available signals in the status are packed together in groups of 16. In the status there are 10 of these groups; the
last group corresponds to the 16 configurable AND gates programmable through GE-INTRO software. To this last
group AND1....AND16 we can address the internal signals or also the output of another group’s AND.
In the DFF we have a total of 17 LEDs available, one bicolor (not configurable) for the internal alarm function plus
16 red. These 16 LEDs form a single column, and all of them are configurable using GE-INTRO software.
All events (32 originated by protection and 16 by communications), or an OR combination of them (maximum 16
inputs coming out from the same group) may be addressed to the LEDs.
Also we can select LED by LED whether we want memory on them or not. This impacts the way LEDs will operate
after a loss of the power supply. If they have memory, once the relay is powered up again the LEDs will recover
their previous states regardless the condition that made them operate still persists or not.
Also we can program the LEDs to blink just after the power up.
There is also a test facility for the LEDs, by pressing the TARGET RESET button all them will be lit. The same
button allows the reset of the LEDs signalling by pressing continuously during three seconds.
The default configuration of the DFF is the following:
LED DESCRIPTION LED DESCRIPTION
1 Frec. Pickup Function. 1 9 Frec. Trip Function. 1
2 Frec. Pickup Function. 2 10 Frec. Trip Function. 2
3 Frec. Pickup Function. 3 11 Frec. Trip Function. 3
4 Frec. Pickup Function 4 12 Frec. Trip Function. 4
5 Frec. Pickup Function. 5 13 Frec. Trip Function. 5
6 Frec. Pickup Function. 6 14 Frec. Trip Function. 6
7 Frec. Pickup Function. 7 15 Frec. Trip Function. 7
8 Frec. Pickup Function. 8 16 Frec. Trip Function. 8