Operating instructions7SV512
V1
C53000---G1176---C91
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: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
1 2 1 2 T 2 - C U R R E N T
0 . 1 5 s
Delay time of the trip signal to the adjacent breakers
(bus-bar and, if applicable, remote end) if breaker aux-
iliary contacts are the breaker failure criterion
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
1 2 1 3 T 2 C B - A U X .
0 . 1 5 s
Delay time of the bus-trip signal to the adjacent break-
ers (bus-bar and, if applicable, remote end) if the local
feeder breaker is defective
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
1 2 1 4 T 3 C B - D E F .
0 . 0 0 s
Thedelay time ofthe end fault protection issetunder
address 1220.An end fault isashort-circuit between
the circuit breaker andthe current transformer set of
the feeder.
If, during an end fault, the circuit breaker is tripped
byareverse fault stage ofthe feeder protection orby
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.
The time T---ENDFAULT (address 1220) is started
when, during fault detection conditions ofthe feeder
protection, thecircuit breaker auxiliary contactsindi-
cate open poles and, at the same time, current flow
isdetected (address 1202).The tripcommand ofthe
end fault protection is intended for the transmission
of an intertrip signal to the remote end circuit break-
er.
Thus, thedelay time isset such that it can bridge out
short transient end fault conditionswhich mayoccur
during switching of the breaker.
Delay time for end faults until trip signal for transmis-
sion to the remote end is generated
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
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
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 theconnection diagram inAppen-
dix B, all check functions are optimized to match
each other and the safety requirements.
To Next Page
Loading...
