Recording Function - Toshiba GRL100-701B Instruction Manual

3.4 Recording Function

The GRL100 is provided with the following recording functions:
These records are displayed on the LCD of the relay front panel or on the local or remote PC.
3.4.1 Fault Recording
Fault recording is started by a tripping command of the GRL100, a tripping command of the
external main protection or PLC command by user-setting (max. 4) and the following items are
recorded for one fault:
Up to 8 most-recent faults are stored as fault records. If a new fault occurs when 8 faults have
been stored, the record of the oldest fault is deleted and the record of the latest fault is then
stored.
Date and time of fault occurrence
The time resolution is 1 ms using the relay internal clock. To be precise, this is the time at which
a tripping command has been output.
Fault phase
The faulted phase is indicated by DIF, OC or OCI operating phase.
Tripping phase
This is the phase to which a tripping command is output.
Tripping mode
This shows the protection scheme that outputted the tripping command.
Fault location
The distance to the fault point calculated by the fault locator is recorded. The distance is
expressed in km and as a percentage (%) of the line length in two-terminal application. In case of
three-terminal application, the distance in km and the section on the fault point are displayed.
For the fault locator, see Section 2.17.
Relevant events
Such events as autoreclose, re-tripping following the reclose-on-to-a fault or autoreclose and
tripping for evolving faults are recorded with time-tags.
Power system quantities
The following power system quantities in pre-faults and post-faults are recorded. The power
system quantities are not recorded for evolving faults.
Fault recording
Event recording
Disturbance recording
Date and time of fault occurrence
Faulted phase
Tripping phase
Tripping mode
Fault location
Relevant events
Power system quantities
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6 F 2 S 0 8 5 0