Fault Records; Maintenance Reports; Resetting Of Event/Fault Records - GE P741 Technical Manual

P74x/EN MR/Na7
(MR) 8-10
2.3.7

Fault records

Each time a fault record is generated, an event is also created. The event simply states that
a fault record was generated, with a corresponding time stamp.
Note that viewing of the actual fault record is carried out in the "Select Fault'" cell further
down the "VIEW RECORDS" column, which is selectable from up to 5 records. These
records consist of fault flags, fault location, fault measurements etc. Also note that the time
stamp given in the fault record itself will be more accurate than the corresponding stamp
given in the event record as the event is logged some time after the actual fault record is
generated.
The fault record is triggered from the 'Fault REC. TRIG.' signal assigned in the default
programmable scheme logic to any trip (87BB or 50BF trip in the P741). Note the fault
measurements in the fault record are given at the time of the protection start. Also, the fault
recorder does not stop recording until the reset of the 'Fault REC. TRIG.' signal in order to
record all the protection flags during the fault.
It is recommended that the triggering contact be 'self reset' and not latching. If a latching
contact were chosen the fault record would not be generated until the contact had fully reset.
2.3.8

Maintenance reports

Internal failures detected by the self-monitoring circuitry, such as watchdog failure, field
voltage failure etc. are logged into a maintenance report. The maintenance report holds up
to 10 such 'events' and is accessed from the "Select Report" cell at the bottom of the "VIEW
RECORDS" column.
Each entry consists of a self explanatory text string and a 'Type' and 'Data' cell, which are
explained in the menu extract at the beginning of this section.
Each time a Maintenance Report is generated, an event is also created. The event simply
states that a report was generated, with a corresponding time stamp.
MR
2.3.9 Setting changes
Changes to any setting within the relay are logged as an event. Two examples are shown in
the following table:
Type of Setting Change
Control/Support Setting
Group # Change
Where # = 1 to 4
2.4

Resetting of event/fault records

If it is required to delete either the event, fault or maintenance reports, this may be done from
within the "RECORD CONTROL" column.
Displayed Text in Event Record
C & S Changed
Group # Changed
Note: Control/Support settings are communications, measurement, CT/VT
ratio settings etc, which are not duplicated within the four setting
groups. When any of these settings are changed, the event record is
created simultaneously.
disturbance recorder settings will only generate an event once the
settings have been confirmed at the 'setting trap'.
Measurements and Recording
MiCOM P741, P742, P743
Displayed Value
However, changes to protection or
22
#