Siemens SIPROTEC 7UT613 series, Руководство пользователя

Страница: 274 / 638

2 Functions
274
7UT613/63x Manual
C53000-G1176-C160-2
The delay time
T1
(address
7115
) is then set to
∞
since it is not needed.
The delay times are determined from the maximum operating time of the feeder circuit
breaker, the reset time of the current detectors of the breaker failure protection, plus
a safety margin which allows for any tolerance of the delay timers. The time sequenc-
es are illustrated in Figure 2-111. For sinusoidal currents one can assume that the
reset time of the current detectors is about
1
/
2
cycle but if current transformer satura-
tion is expected, then1
1
/
2
cycles should be assumed as worst case.
Figure 2-111 Time sequence for normal clearance of a fault, and with circuit breaker failure
example for single-stage breaker failure protection
Additional Circuit
Breaker Failure
Protection Func-
tions In the aforementioned description, the first circuit breaker failure protection is de-
scribed respectively. The differences in the parameter addresses and message
numbers of the first and second circuit breaker failure protection are illustrated in the
following table. The positions marked by x are identical.
2.17.3 Settings
Parameter address-
es
Message no.
1. Circuit breaker failure protection 70xx 047.xxxx(.01)
2. Circuit breaker failure protection 71xx 206.xxxx(.01)
Addr. Parameter Setting Options Default Setting Comments
7001 BREAKER FAILURE OFF
ON
Block relay OFF Breaker Failure Protection
7011 START WITH REL. 0 .. 8 0 Start with Relay (intern)
7012 START WITH REL. 0 .. 24 0 Start with Relay (intern)
7015 T1 0.00 .. 60.00 sec;
∞
0.15 sec T1, Delay of 1st stage (local trip)
7016 T2 0.00 .. 60.00 sec;
∞
0.30 sec T2, Delay of 2nd stage (busbar
trip)