7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 62 of 77
Section 5: Supervision Functions
5.1 Circuit Breaker Failure (50BF)
The circuit breaker fail function has two time delayed outputs that can be used for combinations of
re-tripping or back-tripping. CB fail outputs are given after elapse of the
50BF-1 Delay
or
50BF-2 Delay
settings. The two timers run concurrently.
The circuit breaker fail protection time delays are initiated either from:
An output
Trip Contact
of the relay (MENU: OUTPUT CONFIG\TRIP CONFIG\Trip Contacts), or
A binary or virtual input assigned to
50BF Ext Trig
(MENU: INPUT CONFIG\INPUT MATRIX\ 50BF Ext Trig).
A binary or virtual input assigned to
50BF Mech Trip
(MENU: INPUT CONFIG\INPUT MATRIX\50BF
Mech Trip).
CB fail outputs will be issued by providing any of the 3 phase currents are above the
50BF Setting
or the current
in the fourth CT is above
50BF-I4
for longer than the
50BF-n Delay
setting, or for a mechanical protection trip the
circuit breaker is still closed when the
50BF-n Delay
setting has expired – indicating that the fault has not been
cleared.
Both
50BF-1
and
50BF-2
can be mapped to any output contact or LED.
If the
CB Faulty
input (MENU: INPUT CONFIG\INPUT MATRIX\CB Faulty) is energised when a CB trip is given
the time delays
50BF-n Delay
will be by-passed and the output given immediately.
Operation of the CB Fail elements can be inhibited from:
Inhibit 50BF
A binary or virtual input.
Trip Contact
50BF-1
50BF-2
≥
1
IL1
>
50 BF Setting
50 BF Element
Enabled
Disabled
50BF- 1 Delay
50BF-2 Delay
Inhibit 50BF
&
&
&
50 BF Ext Trig
IL3
IL2
&
50 BF CB Faulty
≥
1
≥
1
CB Closed
≥
1
50 BF Mech Trip
&
IL4
>
50BF-I 4 Setting
&
≥
1
&
Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF)
Содержание 7SR10 Argus Series
Страница 1: ...7SR10 Argus Overcurrent Relay Reyrolle Protection Devices ...
Страница 2: ...Siemens Protection Devices Limited 2 ...
Страница 152: ...7SR10 Technical Manual Chapter 4 Page 2 of 78 2018 Siemens Protection Devices ...
Страница 156: ...7SR10 Technical Manual Chapter 4 Page 6 of 78 2018 Siemens Protection Devices ...
Страница 188: ...7SR10 Technical Manual Chapter 4 Page 38 of 78 2018 Siemens Protection Devices ...
Страница 216: ...7SR10 Technical Manual Chapter 4 Page 66 of 78 2018 Siemens Protection Devices ...
Страница 218: ...7SR10 Technical Manual Chapter 4 Page 68 of 78 2018 Siemens Protection Devices ...
Страница 220: ...7SR10 Technical Manual Chapter 4 Page 70 of 78 2018 Siemens Protection Devices ...
Страница 222: ...7SR10 Technical Manual Chapter 4 Page 72 of 78 2018 Siemens Protection Devices ...