Siemens Argus 7SR21 - Page 576

7SR210 & 7SR220 Commissioning & Maintenance Guide
Page 64 of 82 © 2013 Siemens Protection Devices Limited
If the element is set as 55-n U/C Guarded, the setting can be tested by applying the test current at a level below
the 55-n U/C Guard Setting at a power in the operate range. Increase the current until the relay operates.
UCG
UCG
Setting
(xIn)
Power element
Used for test
Blocked
Current
(D.O.)
Unblocked
Current
(P.U.)
NOTES
Power
Factor
1.1.1.1 Element Blocking
The Power Factor elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element BI Inhibits
55-1
55-2
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.