Equipment Configuration - GE Multilin DFF Instruction Manual

4. EQUIPMENT CONFIGURATION

The DFF is a microprocessor-based relay that samples analog inputs, processes them by means of internal
algorithms and activates outputs accordingly. Most of the relay information may be accessed by the user in order to
create special configurations of inputs, outputs and LEDs, using AND, OR and NOT logical gates. The DFF presents
this information as "Internal Status", which is a set of logical Boolean states of all the internal variables available
inside the relay. Each variable may be a "0" or a "1". As an example, one internal state is the pickup of a frequency
unit. If this unit operates as underfrequency, its internal state will be "1". This value can be configured to close an
output contact or lit an LED.
In the same way if one digital input is activated, its "internal state" goes to "1", and it can be configured also to close
an output contact or to lit an LED.
The DFF device has two different types of internal states:
• Protection internal states.
• General and communication internal states.
The following tables show the list of the internal signals available.
GEK-106166E
EQUIPMENT CONFIGURATION
DFF Digital Feeder Relay 19