Alarm Record; Fault Record; Maintenance Record; Disturbance Record - GE P50 Agile P253 Technical Manual

P50 Agile P253
2.1.2

Alarm Record

The P253 logs any alarm conditions it generates as individual events. Details of the event are
displayed in the Alarm Record submenu under VIEW RECORDS menu.
A Time and Date stamp is always associated with the event in question and is displayed after the
event description. The alarms are stored in alarm record till the alarm is acknowledged by CLEAR key.
2.1.3

Fault Record

A fault record is triggered by any protection signal which trips the circuit breaker. If there are any fault
records, these will appear automatically in the VIEW RECORDS column. You can select the fault
record in the VIEW RECORDS column. A value of '01' corresponds to the latest fault record.
Information about the fault follows in the subsequent cells. The time stamp assigned to the fault record
itself is more accurate than the corresponding stamp of the event record, because the event is logged
after the actual fault record is generated. The fault measurements in the fault record are given at the
time of the protection Start.
After every fault relay latched fault data which can be viewed for detailed analysis. The following
details are applicable for fault record.
Capacity: 5 faults
Time-tag: 1 millisecond
Triggers: Any selected protection threshold.
Data:
2.1.4

Maintenance Record

Internal failures detected by the self-monitoring circuitry, such as watchdog failure and alarms related
to CB operation are logged as maintenance records. If there are any maintenance records, these will
appear automatically in the VIEW RECORDS column. You can select the maintenance record in the
Maint Record submenu in the VIEW RECORDS column. The latest maintenance record is always
displayed at the top while navigating the Maint Record submenu.
The following details are applicable for maintenance data
Capacity
Triggers
Data
2.1.5

Disturbance Record

The disturbance recorder can record the waveforms of the calibrated analogue channels, as well as
the values of the digital signals. The disturbance recorder is supplied with data once per cycle, and
collates the received data into a disturbance record. The disturbance records can be extracted using
application software or the SCADA system, which can also store the data in COMTRADE format,
allowing the use of other packages to view the recorded data.
The integral disturbance recorder has an area of memory specifically set aside for storing disturbance
records. Up to 5 such waveforms can be recorded; the duration of each disturbance record is 1sec.
The maximum total recording time is 5 seconds.
When the available memory is exhausted, the oldest records are overwritten by the newest ones. The
disturbance recorder stores the samples that are taken at a rate of 16 samples per cycle.
Each disturbance record consists of 5 analogue data channels and 37 digital data channels. The
relevant CT ratio for the analogue channels is also extracted to enable scaling to primary quantities.
The relay records the waveform of the current along with all digital and logical status during a fault.
The disturbance record can be triggered from trip operation of relay. It is not possible to view the
P253/EN M/C
Fault number, Type of fault (stage/Phase/EF), Trip counter, Fault current magnitude
in Secondary, Trip Timing, Thermal state, Fault date and Fault time.
: 100 records
: Any hardware error and CB Operation error
: Error Code, Error description and Date & Time
8 Monitoring & Control
8-5