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7UT51 v3
18.8.4
Waveform Capture during
Test Fault Record –
Address 4900
Recording a test fault record is especially important for
use on protected objects where large inrush currents
can be produced by transient saturation of the
transformer iron. Since a large inrush current may
have the same effect as a single ended infeed fault,
energizing the protected object several times checks
the effectiveness of the inrush stabilization.
Since the pick up signal of the relay is not stabilized,
the inrush current will start fault recording
automatically, provided that Address 7402 WAVE
TRIG is set to Trig with Pickup. Otherwise a fault
record is only stored if the relay has tripped. A fault
record can always be triggered via a discrete input,
provided this is allocated. A manual start of the
waveform capture record (for analysis of the steady
state rms current or test current) can also be
performed in Address Block 4900.
The data can then be downloaded to a PC for
analysis, and verification that the relay is processing
all inputs as required by the application.
The effectiveness of the inrush stabilization can be
determined from the recording of the differential
currents and the harmonic contents. If necessary, the
inrush current stabilization effect can be increased in
Address 1611, when trip occurs, or when the recorded
data show that the second harmonic content does not
safely exceed the set stabilizing threshold set in
Address 1611. A further method to increase inrush
stability is to set the cross block function
(Address 1612) effective or to increase the duration of
the cross block function.
The relay can simultaneously capture data for all
current inputs and up to four user-defined functions
that report the status of discrete-signal inputs. The
data must be downloaded to a PC for analysis and
storage.
PRIM-2330C
Field Testing and Commissioning
The data storage parameters can be programmed in
Address Block 7400. Data storage can also be
initiated via a discrete input or by the operator via the
front panel of the relay or a PC. The configuration
parameters required for this function to operate are as
follows:
•
Address 7402 – Initiates the waveform capture
with pickup or trip.
•
Address 7410 – Determines the max. length of
time for the waveform capture.
•
Address 7411 – Sets the pre-trigger time.
•
Address 7412 – Sets amount of captured
waveform after trigger.
•
Address 7431 – Storage time for triggering via
discrete (binary) input
•
Address 7432 – Storage time for triggering via the
keyboard.
Manual starting of the record can be carried out in
Address Block 4900. The message will read: FAULT
REC. START? Confirm with YES key. The relay will
acknowledge successful completion of the test
recording.
To initiate manual starting of a fault via WinDIGSI:
1. Go to the Options Menu.
2. Choose Device.
3. Choose Initiate Fault Record.
To access the waveform data using WinDIGSI and
DIGRA, choose the following menu items:
•
Fault /
•
Fault Record- Select fault instance/
•
Options /Type of Graph - (Prim., Sec., or
Normalized)
•
DIGRA/
•
Display Analog Curves -From this point, several
choices are given to display and analyze the data.
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