Opto-Input Events; Contact Events; Alarm Events - GE MiCOM P747 Agile Technical Manual

Chapter 6 - Monitoring and Control
● Fault record events
● Standard events
● Security Events
Standard events are further sub-categorised internally to include different pieces of information. These are:
● Protection events (starts and trips)
● Maintenance record events
● Platform Events
2.2.1

OPTO-INPUT EVENTS

If one or more of the opto-inputs has changed state since the last time the protection algorithm ran (which
runs at several times per cycle), a new event is created, which logs the logic states of all opto-inputs. You
can tell which opto-input has changed state by comparing the new event with the previous one.
The description of this event type, as shown in the Event Text cell is always Logic Inputs # where # is
the batch number of the opto-inputs. This is '1', for the first batch of opto-inputs and '2' for the second batch
of opto-inputs (if applicable).
The event value shown in the Event Value cell for this type of event is a binary string. This shows the logical
states of the opto-inputs, where the LSB (on the right) corresponds to the first opto-input Input L1.
The same information is also shown in the Opto I/P Status cell in the SYSTEM DATA column. This
information is updated continuously, whereas the information in the event log is a snapshot at the time when
the event was created.
2.2.2

CONTACT EVENTS

If one or more of the output relays (also known as output contacts) has changed state since the last time the
protection algorithm ran (which runs at several times per cycle), a new event is created, which logs the logic
states of all output relays. You can tell which output relay has changed state by comparing the new event
with the previous one.
The description of this event type, as shown in the Event Text cell is always Output Contacts # where #
is the batch number of the output relay contacts. This is '1', for the first batch of output contacts and '2' for the
second batch of output contacts (if applicable).
The event value shown in the Event Value cell for this type of event is a binary string. This shows the logical
states of the output relays, where the LSB (on the right) corresponds to the first output contact Output R1.
The same information is also shown in the Relay O/P Status cell in the SYSTEM DATA column. This
information is updated continuously, whereas the information in the event log is a snapshot at the time when
the event was created.
2.2.3

ALARM EVENTS

The IED monitors itself on power up and continually thereafter. If it notices any problems, it will register an
alarm event.
The description of this event type, as shown in the Event Text cell is cell dependent on the type of alarm and
will be one of those shown in the following tables, followed by OFF or ON.
The event value shown in the Event Value cell for this type of event is a 32 bit binary string. There are one
or more banks 32 bit registers, depending on the device model. These contain all the alarm types and their
logic states (ON or OFF).
The same information is also shown in the Alarm Status (n) cells in the SYSTEM DATA column. This
information is updated continuously, whereas the information in the event log is a snapshot at the time when
the event was created.
152
MiCOM P747
P747-TM-EN-1
P747-TM-EN-1.1