Siemens 7SR224 - Page 278

7SR224 Argus Commissioning & Maintenance Guide
©2010 Siemens Protection Devices Limited Chapter 6 Page 52 of 73
F
(Hertz)
U/O DTL
(sec)
Hyst. D.O.
(calc.)
P.U.
Freq
Hertz
D.O.
Freq.
Hertz
Operate
Time
+/- 0.5Hz
UV
Guard
NOTES
If the element is set as 81-nU/V Guarded, this setting can be tested by applying the test voltage at a level below
the 81 U/V Guard Setting at a frequency in the operate range. Increase the voltage until the relay operates.
UVG UVG Setting
(Volts)
Freq element
Used for test
Blocked
Volts (D.O.)
Unblocked Volts (P.U.) NOTES
U/O
Freq
2.12.8.1 Element Blocking
The U/O F
requency elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element BI Inhibits
81-1
81-2
81-3
81-4
81-5
81-6
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.