General Device Data
321
7SS52 V4 Manual
C53000-G1176-C182-3
9.2.12 Auxiliary Functions
Self-diagnosis – Current monitoring per feeder
– Auxiliary voltage monitoring
– Cyclic test
– Check of the data transmission between central unit and bay units
– Memory tests
Operational
measured values
Central unit
Feeder currents I
L1
; I
L2
, I
L3
in A primary,
in % I
N
(feeder transformer) and
in % I
No
(reference transformer)
– Range 0 to 1000% I
N
– Tolerance typically 2% of measured value
Differential and I
dL1
; I
dL2
; I
dL3
in % I
No
restraint (stabilizing) currents I
sL1
; I
sL2
; I
sL3
in % I
No
of all bus sections
and the Checkzone
(separate for ZPS-BSZ1 and ZPS-BSZ2)
– Range 0 to 1000% I
N
Operational
measured values
Bay unit
Feeder currents I
L1
; I
L2
, I
L3
; I
E
in A primary and in % I
N
and in
% I
No
– Range 0 to 6000% I
N
– Tolerance typically 2% of measured value
Differential and I
dL1
; I
dL2
; I
dL3
restraint (stabilizing) currents I
sL1
; I
sL2
; I
sL3
– Range 0 to 6000% I
N
Frequency f in Hz (I > 0.1 I
N
)
– Range f
N
± 5Hz
– Tolerance 0.1 Hz
Event recording Central unit
Storage of the last
200 operational events and 80 fault events
Bay unit
Storage of the last
50 operational events and 100 fault events
Fault recording Central unit
Resolution 1 ms at 50 Hz
0.83 ms at 60 Hz
Pre/post capture time (from busbar TRIP − 500 to + 500 ms at 50 Hz
or initiation by binary input/operation) − 416 to + 416 ms at 60 Hz
(up to 8 fault records)
Capture Time max. 5s (total)
Bay unit
Resolution 1 ms at 50 Hz
0.83 ms at 60 Hz
Pre/post capture time (from busbar TRIP − 500 to + 500 ms at 50 Hz
or initiation by binary input/operation) − 416 to + 416 ms at 60 Hz
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