Method of operation7SV512
V1
23C53000---G1176---C91
4 Method of operation
4.1 Operation of complete unit
The numerical circuit breaker failure protection
7SV512 is equipped with a powerful and proven
16---bit microprocessor. This provides fully digital
processing of all functions from data acquisition of
measured values to trip signal output to the circuit
breakers.
Figure 4.1 shows the basic structure of the unit.
The transducers of the measured value input sec-
tion ME transform the currents from the measure-
ment transformers of the switch-gear and match
them to the internal processing level of the unit.
Apart from galvanic and low-capacitance isolation
provided by the input transformers, filters are pro-
vided for the suppression of interference. The filters
have been optimized with regard tobandwidth and
Serial
interface
Serial
interface
Personal
computer
Power
supply
10 binary
inputs
Operator
panel
M/S
ME AE
Ç
LED---
Reset
CW 7 8 9
R
F
DA
4 5 6
1 2 3
0 ¡ 1
J/Y
N +/--- E
C
L1
L2
L3
Bus-
bar
Feeder
breaker
LCD display
(2 x 16
characters)
8 signals
(can be mar-
shalled)
5 x 2 trip com-
mands (can be
marshalled)
Control centre
Fault
Ready
6 LED (can be
marshalled)
Figure 4.1 Hard-ware structure of the numerical circuit breaker failure protection relay 7SV512
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