Siemens 7SJ85 - Settings

Parameter: Minimum operate time
•
Default setting (_:112) Minimum operate time = -
The Minimum operate time parameter is used to set the minimum duration for tripping the function.
!
CAUTION
Do not set a time that is too short.
If you set a time that is too short, there is a danger (dropout of the function without the current-flow
criterion) that the device contacts will interrupt the control circuit. If this happens, the device
contacts will burn out.
²
Set a duration that is long enough to ensure that the circuit breaker reaches its final position open
reliably after a control operation.
Input Signal: >CB defect
The input signal >CB defect has a default filtering time of 20 ms. This filtering time prevents the input
signal from becoming effective in the case of a transient activation of the physical binary input, which can be
caused by the pressure change when the CB opens.
This time can be set to 0 if such a transient pickup of the physical binary input can be excluded due to the CB
design.
Output Signal: Retrip T1
If only one control circuit is available for the local CB, it is not mandatory to route the output signal because
the signal also controls the CB trip logic.
If a 2nd Control circuit is present, the Retrip T1 output signal must be routed to the associated binary
output.
Output Signal: Trip T2
In order to operate the adjacent circuit breakers, the backup tripping (indication Trip T2) must be routed to
a binary output; andif necessary, to an interface (intertripping to opposite end).
Settings
Addr.
Parameter C Setting Options Default Setting
50BF Ad.CBF #
_:1 50BF Ad.CBF #:Mode
•
off
•
on
•
test
on
_:105 50BF Ad.CBF #:Holding
int. start signal
•
no
•
yes
yes
_:107 50BF Ad.CBF #:Start via
binary input
•
no
•
2 channel
•
1 channel
no
_:106 50BF Ad.CBF #:Holding
ext. start signal
•
no
•
yes
no
_:111 50BF Ad.CBF #:Sup.time
for release signl
0.00 s to 1.00 s 0.06 s
_:103 50BF Ad.CBF #:CB
aux.cont. crit. allowed
•
no
•
w. 'CB pos. closed 3p.'
no
6.41.5
Protection and Automation Functions
6.41 Circuit-Breaker Failure Protection
850 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017