Siemens 7SV512 Instruction Manual page 78

7SV512
V1
1 2 1 2 T 2 - C U R R E N T
0 . 1 5 s
1 2 1 3 T 2
0 . 1 5 s
1 2 1 4 T 3
0 . 0 0 s
The delay time of the end fault protection is set under
address 1220. An end fault is a short-circuit between
the circuit breaker and the current transformer set of
the feeder.
If, during an end fault, the circuit breaker is tripped
by a reverse fault stage of the feeder protection or by
the bus-bar protection (the fault is a bus-bar fault as
determined from the location of the current trans-
formers), the fault current will continue, because it is
fed from the remote end of the feeder circuit.
1 2 2 0 T - E N D F A U L T
0 . 1 0 s
In order to meet the high safety requirement of the
circuit breaker failure protection, comprehensive
monitoring facilities and plausibility checks have
been incorporated to the 7SV512 relay. For details
refer to Section 4.2.7.
A pre-condition for the correct operation of some of
78
Delay time of the trip signal to the adjacent breakers
(bus-bar and, if applicable, remote end) if current flow
(address 1202) is breaker failure criterion
Smallest setting value:
Largest setting value:
or 1, i.e. no trip in this case
Delay time of the trip signal to the adjacent breakers
C B - A U X .
(bus-bar and, if applicable, remote end) if breaker aux-
iliary contacts are the breaker failure criterion
Smallest setting value:
Largest setting value:
or 1, i.e. no trip in this case
Delay time of the bus-trip signal to the adjacent break-
C B - D E F .
ers (bus-bar and, if applicable, remote end) if the local
feeder breaker is defective
Smallest setting value:
Largest setting value:
or 1, i.e. no trip in this case
Delay time for end faults until trip signal for transmis-
sion to the remote end is generated
Smallest setting value:
Largest setting value:
or 1, i.e. no trip in this case
The time T---ENDFAULT (address 1220) is started
when, during fault detection conditions of the feeder
protection, the circuit breaker auxiliary contacts indi-
cate open poles and, at the same time, current flow
is detected (address 1202). The trip command of the
end fault protection is intended for the transmission
of an intertrip signal to the remote end circuit break-
er.
Thus, the delay time is set such that it can bridge out
short transient end fault conditions which may occur
during switching of the breaker.
these monitoring and plausibility check functions is,
that the relay is connected according to a certain
connection scheme. If the binary inputs and outputs
are assigned as delivered and if the relay is con-
nected according the connection diagram in Appen-
dix B, all check functions are optimized to match
each other and the safety requirements.
Operating instructions
0.00 s
32.00 s
0.00 s
32.00 s
0.00 s
32.00 s
0.00 s
32.00 s
C53000---G1176---C91