2.35 Ancillary Functions
217
7UM61 Manual
C53000-G1176-C127-3
by appropriate programs in the central device. Currents and voltages are referred to
their maximum values, scaled to their rated values and prepared for graphic presen-
tation. Binary signal traces (marks) of particular events e.g. "pickup", "tripping" are
also recorded.
Transfer to a central device can be polled automatically, either after each fault detec-
tion by the protection, or only after a trip.
2.35.4.2 Setting Notes
Fault Recording
Fault recording (waveform capture) will only take place if address
104
FAULT VALUE
is set to
Instant. values
or
RMS values
. Other settings pertaining to fault record-
ing (waveform capture) are found under the submenu
OSC. FAULT REC.
of the
PA-
RAMETER
menu. Waveform capture makes a distinction between the trigger instant
for an oscillographic record and the criterion to save the record (address
401
WAVEFORMTRIGGER
). Normally the trigger instant is the pickup of the protective ele-
ment, i.e. when a protective element picks up the time is 0. The criterion for saving
may be both the device pickup (
Save w. Pickup
) or the device trip (
Save w.
TRIP
). A trip command issued by the device can also be used as trigger instant
(
Start w. TRIP
); in this case it is also the recording criterion.
The actual storage time encompasses the pre-fault time
PRE. TRIG. TIME
(address
404
) ahead of the reference instant, the normal recording time and the post-fault time
POST REC. TIME
(address
405
) after the storage criterion has reset. The maximum
length of time of a fault record
MAX. LENGTH
is entered in Address
403
. The setting
depends on the criterion for storage, the delay time of the protective functions and the
desired number of stored fault events. The largest value here is 5 s for fault recording
of instantaneous values, 80 s for recording of rms values (see address
104
). A total
of 8 records can be saved in this time.
Note:
These times apply for 50 Hz. They will be different with another frequency. If
RMS values
are stored, the times stated for parameters
403
to
406
will be 16 times
longer.
An oscillographic record can be activated via a binary input, by front panel operation
or via the operating interface connected to a PC. Storage is then triggered dynamically.
The length of the fault recording is set in address
406
BinIn CAPT.TIME
(maximum
length however is
MAX. LENGTH
, address
403
). Pre-fault and post-fault times will be
included. If the binary input time is set for
∞
, then the length of the record equals the
time that the binary input is activated (static), or the
MAX. LENGTH
setting in address
403
, whichever is shorter.
2.35.4.3 Settings
Addr.
Parameter
Setting Options
Default Setting
Comments
401
WAVEFORMTRIGGE
R
Save w. Pickup
Save w. TRIP
Start w. TRIP
Save w. Pickup
Waveform Capture
403
MAX. LENGTH
0.30 .. 5.00 sec
1.00 sec
Max. length of a Waveform
Capture Record
404
PRE. TRIG. TIME
0.05 .. 0.60 sec
0.20 sec
Captured Waveform Prior to
Trigger
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