7SR210 & 7SR220 Commissioning & Maintenance Guide
Page 66 of 82 © 2013 Siemens Protection Devices Limited
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) 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 □
1.1.1.1 Element Blocking
The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked.
Element BI Inhibits
50BF
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