Siemens 7SR12 Argus - Element Blocking

7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 61 of 72
50BF Setting (xIn)
Test Current
50BF-1 Delay……………
50BF-2 Delay……………….
(110%)………….
(90%)…………...
No Operation □
No Operation □
50BF CB Faulty
Operation No Delay □
Operation No Delay □
50BF-
I4 Setting
(xIn)
Test Current
50BF-1 Delay…………… 50BF-2 Delay……………….
(110%)………….
(90%)…………...
No Operation □
No Operation □
50BF CB Faulty
Operation No Delay □
Operation No Delay □
If the circuit breaker can also receive a trip signal from a protection function where there is no increase in current,
this trip input should be mapped to 50BF Mech Trip in the INPUT CONFIG>INPUT MATRIX menu.
Initiate this binary input and simulate the circuit breaker remaining closed by ensuring the CB Closed binary Input
is energised and ensure operation of the 50BF-1 and 50BF-2 outputs after their programmed delays.
50BF Mech Trip
50BF-1 Delay……………
50BF-2 Delay……………….
CB Closed
CB Open
No Operation □
No Operation □
3.1.1 Element Blocking
The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
50BF