Oscillographic Fault Records; Description; Setting Notes - Siemens siprotec SJ62 User Manual

2.1.4

Oscillographic Fault Records

2.1.4.1

Description

2.1.4.2

Setting Notes

Configuration
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The Multi-Functional Protection with Control 7SJ62/63/64 is equipped with a fault
record memory. The instantaneous values of the measured quantities
i , i , i , i or i and v
A B C N NS A
(voltages in accordance with connection) are sampled at intervals of 1.25 ms (for
50Hz) and stored in a circulating buffer (16 samples per cycle). For a fault, the data
are stored for an adjustable period of time, but not more than 5 seconds (up to 20
seconds for 7SJ64). Up to 8 fault records can be recorded in this buffer. The fault
record memory is automatically updated with every new fault, so no acknowledgment
for previously recorded faults is required. The fault record buffer can also be started
with protection pickup, via binary input and serial port.
The data can be retrieved via the serial interfaces by means of a personal computer
and evaluated with the protection data processing program DIGSI and the graphic
analysis software SIGRA 4. The latter graphically represents the data recorded during
the system fault and also calculates additional information from the measured values.
Currents and voltages can be presented as desired as primary or secondary values.
Signals are additionally recorded as binary tracks (marks) e.g. "pickup", "trip".
If the device has a serial system interface, the fault recording data can be passed on
to a central device via this interface. The evaluation of the data is done by applicable
programs in the central device. Currents and voltages are referred to their maximum
values, scaled to their rated values and prepared for graphic representation. Binary
signal traces (marks) of particular events e.g. "fault detection", "tripping" are also rep-
resented.
In the event of transfer to a central device, the request for data transfer can be exe-
cuted automatically and can be selected to take place after each fault detection by the
protection, or only after a trip.
Fault recording (waveform capture) will only take place if address 104 OSC. FAULT
REC. is set to Enabled. Other settings pertaining to fault recording (waveform cap-
ture) are found under the Osc. Fault Rec. submenu of the SETTINGS menu. It
has to be distinguish for the fault recording between the trigger and the recording cri-
terion (address 401 WAVEFORMTRIGGER). Normally the trigger is the pickup of a pro-
tective element, 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 (Start
w. TRIP); in this case it is also the recording criterion.
A fault event starts with the pickup by any protective function and ends when the last
pickup of a protective function has dropped out. Usually this is also the extent of a fault
recording (address 402 WAVEFORM DATA = Fault event). If automatic reclosures
are performed, the entire network fault — or with more automatic reclosures — can be
recorded up to a final clearing (address 402 WAVEFORM DATA = Pow.Sys.Flt.).
This facilitates the representation of the entire system fault history, but also consumes
storage capacity during the auto-reclosure dead time(s).
, v , v , v or 3 · v and v
B C N 0
(only 7SJ64)
SYN
2.1 General
50