Monitoring Functions (Event, Fault, Disturbance, Start-Up Current Record); Event Record - GE P50 Agile P253 Technical Manual

8 Monitoring & Control
2 MONITORING & CONTROL
2.1

Monitoring Functions (Event, Fault, Disturbance, Start-up Current Record)

The IED logs three different types of record. These are Event, Fault and Disturbance records, which
are stored in the IEDs non-volatile memory. It is important to log records because this allows you to
establish the sequence of events that occurred, for example following a particular power system
condition.
The device is capable of storing up to:
• 512 event records (including Alarm/maintenance records)
• 5 Fault records
• 5 Disturbance records
• 1 Start-up current record
When the available space is exhausted, the oldest record is automatically overwritten by the new one.
The IEDs internal clock provides a time tag for each event, to a resolution of 1 ms.
The VIEW RECORDS column contains details of these Event, Alarm, Fault and maintenance records,
which can be displayed on the IEDs front panel, although it is easier to view them using the settings
application software.
The device supports IEC 60870-5-103, Modbus and DNP3.0 protocol. In case IEC60870-5-
103/Modbus protocol is selected while ordering, then relay auto-detects IEC-60870-5-103 and
MODBUS command and responds in respective language. There is no specific setting which defines
the protocol selection between IEC60870-5-103 and Modbus.
2.1.1

Event Record

The event record is generated when certain events happen. A change in any digital input signal or
protection element output signal causes an event record to be created. These events are generated
by the protection software and immediately time stamped. They are then transferred to non-volatile
memory for storage.
The device continuously monitors logical and physical status. There are six physical binary inputs
provided, marked as S1, S2 up to S6. Any physical or logical change is recorded as event. These
events are stored in internal, non-volatile memory along with a time stamp. Some of the events
recorded include: Protection pickup, Relay Reset and CB Trip. A complete list can be found in protocol
document. Up to 512 such events can be stored and downloaded for detailed analysis. Details of the
event data are as follows:
Capacity: 512 events (including Alarm/maintenance records)
Time-tag: 1 millisecond
Triggers: Any selected protection alarm and threshold, Logic input change of state, Self-test
The user can view the event records either using the front panel interface, the USB port or remotely
using the rear EIA(RS)485 port.
8-4
events and setting changes.
P50 Agile P253
P253/EN M/C