Siemens Argus 7SR21 Technical Manual page 578

7SR210 & 7SR220 Commissioning & Maintenance Guide
Apply a trip condition by injection of current to cause operation of a suitable protection element. Allow current to
continue after the trip at a level of 110 % of the 50BF Setting current level on any phase. Measure the time for
operation of operation of 50BF-1 Delay and 50BF-2 Delay. Repeat the sequence with current at 90 % of the 50BF
Setting.current level after the element trip and check for no CB Fail operation.
50BF Setting (xIn)
50BF-I4 Setting
(xIn)
1.1.1.1 Element Blocking
The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked.
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Test Current
(110%)
(90%)
50BF CB Faulty Operation No Delay □
Test Current
(110%)
(90%)
50BF CB Faulty Operation No Delay □
Element
50BF
50BF-1 Delay
No Operation..□
50BF-1 Delay
No Operation..□
© 2013 Siemens Protection Devices Limited
50BF-2 Delay
No Operation.. □
Operation No Delay □
50BF-2 Delay
No Operation.. □
Operation No Delay □
BI Inhibits