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2. OPERATION LOGIC
GEK-106168E DBF Breaker Failure Protection 13
2.4.2 TIME SYNCHRONIZATION.
The DBF system includes an input for time synchronization. This input requires the connection of a device
to supply a demodulated IRIG-B output. In this way coordinated universal time is measured to a high degree of
accuracy and makes possible to tag events generated by the unit with a resolution of one millisecond.
The use of this input makes it possible to correlate data obtained from different units thanks to
synchronization with GPS satellites. In this way it is possible to obtain very useful information for analysis, cross-
referencing the information provided by different units for a given incident.
Alternatively, it is possible to synchronize units by means of communications, using the GE-LOCAL
communications software, or manually by means of the HMI. If the IRIG-B input is used it has priority over time
setting by communications, since the time read by IRIG-B is much more accurate.
2.4.3 CONFIGURABLE INPUTS AND OUTPUTS
2.4.3.1 Digital Inputs
The DBF system has 6 digital inputs (two groups of 3 inputs with one common in each group). The inputs
can be configured by the user by means of the GE-INTRO configuration program. Using the optional expansion
board it is possible to increase the number of inputs up to a total of 14 (2 groups of 3 inputs with one common in
each group and 4 groups of 2 inputs with one common in each group). See the external connections diagram for
additional reference.
One of the following meanings can be assigned to any input: (For more detail about the configuration of the
inputs, see GE-INTRO Instruction Book).
Function P/L
Unused input
50BF Initiate A L
50BF Initiate B L
50BF Initiate C L
3P BF Initiate L
52a pole A L
52a pole B L
52a pole C L
52b pole A L
52b pole B L
52b pole C L
Latching Relays Reset P
External Trigger P
Active Table Select 0 L
Active Table Select 1 L
(L) indicates Level input
(P) indicates Pulse input