2 Functions
272
7UT613/63x Manual
C53000-G1176-C160-2
2.17.2 Setting Notes
General
Note
The first circuit breaker failure protection is described in the setting instructions. The
parameter addresses and message numbers of the second circuit breaker failure pro-
tection are described at the end of the setting instructions under „Additional Circuit
Breaker Failure Protection Functions“.
The circuit-breaker failure protection is only effective and accessible if address
170=BREAKER FAILURE Enabled is set during configuration. In case of single-
phase busbar protection no circuit-breaker failure protection is possible.
If the second circuit-breaker failure protection is used, this must be set under address
171 BREAKER FAIL. 2 to Enabled.
When assigning the protection functions (section 2.1.4 under margin heading „Addi-
tional 3-phase Protection Functions“, it was determined under address 470 BREAKER
FAIL.AT at which side or measuring location of the protected the circuit-breaker
failure protection must be active. Please ensure that the side or measuring location of
the current and the monitored circuit breaker belong together! Both must be at the
supply side of the protected object.
For the second circuit-breaker failure protection the respective address 471 BREAKER
FAIL2AT applies.
Under address 7101 BREAKER FAILURE the first circuit-breaker failure protection ON
or OFF is set. The option Block relay allows to operate the protection but the trip
output relay is blocked.
The second breaker failure protection is switched at address 7101 BREAKER
FAILURE ON or OFF.
Initiation Three statements are essential for the correct initiation of the circuit breaker failure
protection:
The Current-flow Monitoring
Current flow monitoring ensures that the current flow
stops after the trip command has been issued to the breaker to be monitored. It uses
the values set in the General Power System Data 2 is decisive (see section 2.1.6.1
under margin heading „Circuit Breaker Status“). The decisive value is the setting as-
signed to the side or measuring location that indicates the current of the monitored
circuit breaker (addresses 1111 to 1125). This value will certainly be undershot in
case of an open circuit breaker.
The assignment of the CB auxiliary contacts
or the CB feed-back information was ex-
ecuted in accordance with section 2.1.4 under „Circuit-breaker Data“. The configura-
tion of the respective binary inputs must be complete.
The tripping command
for the monitored breaker is determined by address 7111 or
7112 START WITH REL. (depending on the version of the device). Choose the
number of the output relay which shall trip the breaker to be monitored. If START WITH
REL. is parameterised on 0 , no initiation occurs via the internal binary output. Since
7UT613/63x will normally trip several circuit breakers by the various protection func-
tions, the device must be informed about which trip command is decisive for the initi-
ation of the breaker failure protection. If the breaker failure protection is intended to be
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