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3.4 Recording Function
The GRD130 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.
3.4.1
Fault Recording
Fault recording is started by a tripping command of the GRD130 and the following items are
recorded for one fault:
Date and time
Trip mode
Operating phase
Power system quantities
Up to the 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 occurrence
This is the time at which a tripping command has been initiated.
The time resolution is 1 ms using the relay internal clock.
Trip mode
This shows the protection scheme that output the tripping command.
Operating phase
This is the operating phase of relay element.
Power system quantities
The following power system quantities in pre-faults and post-faults are recorded.
-
Magnitude and phase angle of phase voltage (V
-
Magnitude and phase angle of phase-to-phase voltage (V ab , V bc , V ca )
-
Magnitude and phase angle of zero sequence voltage (V
-
Magnitude and phase angle of positive and negative sequence voltages (V
-
Frequency
Frequency is calculated from V
input to the relay, the frequency is displayed as "0Hz".
The displayed power system quantities depend on relay model and its [APPL] setting as shown in
Table 3.4.1.
When V
is calculated from the three phase input voltages in relay internal, the calculated V
0
displayed. When V
(or V
b ). When only residual voltage (zero sequence voltage) is
a
a
e )
(V
is measured directly, the measured input voltage is displayed.
0
, V b , V c )
a
)
0
39
6 F 2 S 0 7 5 7
, V
)
1
2
is
0
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