Oscillographic Fault Records; Description - Siemens SIPROTEC 7SK80 Manual
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Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (43 pages)
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Functions
2.1 General
2.1.4
Oscillographic Fault Records
The Multifunctional Protection with Control 7SK80 is equipped with a fault record memory. The instantaneous
values of the measured values
i
, i
, i
, i
, i
A
B
C
N
Ns
(voltages depend on the connection) are sampled at intervals of 1.0 ms (at 50 Hz) and stored in a revolving
buffer (20 sampling values per cycle). In the case of a fault, the data is stored for a set period of time, but not
for more than 5 seconds. Up to 8 fault events can be recorded in this buffer. The fault record memory is auto-
matically updated with every new fault so that there is no acknowledgment for previously recorded faults re-
quired. In addition to protection pickup, the recording of the fault event data can also be started via a binary
input or via the serial interface
2.1.4.1 Description
The data of a fault event can be read out via the device interface and evaluated with the help of the SIGRA 4
graphic analysis software. SIGRA 4 graphically represents the data recorded during the fault event and also
calculates additional information from the measured values. Currents and voltages can be presented either as
primary or as secondary values. Signals are additionally recorded as binary tracks (marks), e.g. "pickup", "trip".
If port B of the device has been configured correspondingly, the fault record data can be imported by a central
controller via this interface and evaluated. Currents and voltages are prepared for a graphic representation.
Signals are additionally recorded as binary tracks (marks), e.g. "pickup", "trip".
The retrieval of the fault data by the central controller takes place automatically either after each protection
pickup or after a tipping.
Depending on the selected type of connection of the voltage transformers (address 213 VT Connect. 3ph),
the following measured values are recorded in the fault record:
Voltage Connection
Van, Vbn, Vcn
v
AB
v
BC
v
CA
v
A
v
B
v
C
v
N
v
x
Note
The signals used for the binary tracks can be allocated in DIGSI.
Note
If one of the current transformer connection types A,G2,C,G; G->B or A,G2,C,G; G2->B has been selected
via parameter 251 CT Connect., the ground current I
dicated under track I
I
.
Ns
48
and v
, v
, v
, v
, v
, v
A
B
C
AB
BC
CA
Vab, Vbc, VGnd
yes
yes
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yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
. The ground current detected by the fourth current transformer is indicated under track
N
, v
, v
N
X
Vab, Vbc
Vab, Vbc, Vx
yes
yes
yes
measured with the second current transformer is in-
N2
E50417-G1140-C344-A4, Release date 08.2010
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SIPROTEC, 7SK80, Manual
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