Toshiba GRZ100 B Series, Instruction Manual, Page: 164 / 447

⎯
163
⎯
6 F 2 S 0 8 4 6
3.4 Recording Function
The GRZ100 is provided with the following recording functions:
Fault recording
Event recording
Disturbance recording
These records are displayed on the LCD of the relay front panel or on the local or remote PC. For
samples of LCD screen, see Section 4.2.
3.4.1 Fault Recording
Fault recording is started by a tripping command of the GRZ100, 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:
Date and time of fault occurrence
Faulted phase
Tripping phase
Tripping mode
Fault location
Relevant events
Power system quantities
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, and thus it is
approximately 10 ms after the occurrence of the fault.
Fault phase
The faulted phase is displayed when tripping by a distance measuring element. The fault phase is
determined by the "fault phase detection logic". However, the fault phase depends on the setting of
the phase selection element UVC.
In case of the tripping by a backup protection, the fault phase is not displayed and the "---" marked
is displayed.
Tripping phase
This is the phase to which a tripping command is output.
Tripping mode
This shows the protection scheme that the tripping command is output.
Fault location
The fault location is displayed against the fault within the protected line tripped by a distance
measuring element. The distance to the fault point calculated by the fault locator is recorded.