Siemens 6MD85, Manual

Page: 537 / 1256

Parameter: Minimum operate time
•
Default setting (3-pole circuit breaker)
(_:112) Minimum operate time
=
-
•
Default setting (1/3-pole circuit breaker)
(_:115) 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
_:108
(1/3-pole
circuit
breaker) 50BF Ad.CBF #:Sup.time
for release signl 0.00 s to 1.00 s 0.06 s
7.1.5
Protection and Automation Functions
7.1 Circuit-Breaker Failure Protection
SIPROTEC 5, High-Voltage Bay Controller, Manual 537
C53000-G5040-C015-9, Edition 11.2017