Functions
182
7SS52 V4 Manual
C53000-G1176-C182-3
5.13 Fault Recording in the Bay Unit (”Local Fault Recording”)
5.13.1 Functional Description
The instantaneous measured values are stored at intervals of 1 ms (f
N
= 50 Hz) and
833 µs (f
N
= 60 Hz) in a buffer of the bay unit. The instantaneous currents are meas-
ured for each phase.
A fault record is initiated by
• a protection or trip from an internal protection function,
• a start from DIGSI, from the central unit front panel or via a binary input with the an-
nunciation “>Trig.Wave.Cap.“ marshalled to it.
A total of 5 s max is available in the bay unit for oscillographic fault recording. This in-
terval allows to store up to 8 fault records.
New fault records are always entered in the fault record data buffer. The oldest fault
record data are overwritten by the new data.
An oscillographic record can be triggered by a change in status of a binary input, or by
an input at the integrated keypad, or through the PC port.
5.13.2 Setting Notes
INITIATION The parameter INITIATION (7402/BU) is used to set the reference instance and the
storage criterion for fault recording.
With setting STORAGE BY FD. the storage criterion is defined to be the fault detection
by the device. The reference instant for fault recording is the fault detection by the de-
vice.
With setting STORAGE BY TRIP the storage criterion is defined to be the device trip.
The reference instant for fault recording is the fault detection by the device.
With setting START WITH TRIP the storage criterion is defined to be the device trip.
The reference instant for fault recording is the device trip.
T-MAX The parameter T-MAX
(7410/BU) is used to set the maximum time period available
for one fault record.
Note
A description of the central unit's fault recording function is provided in
Chapter 5.6, page 160.
Reading out of oscillographic fault recording data is described in Chapter 6.2.3, page
221.
www . ElectricalPartManuals . com
To Next Page
Loading...
Need help?
General
