Siemens 7SR21 Manual page 43
Overcurrent relay
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Also See for 7SR21:
- Technical manual (644 pages) ,
- Manual (71 pages) ,
- Installation manual (22 pages)
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Is
Phase
(Amps)
I
(I
)
L1
A
I
(I
)
L2
B
I
(I
)
L3
C
2.11.1.1
Element Blocking
The Undercurrent elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
DTL
P.U. Current
(sec)
Amps
Element
37-1
37-2
7SR21 & 7SR22 Argus Commissioning and Maintenance
Operate Time
Tolerance
0.5 x Is
Tolerance
BI Inhibits
Chapter 6 Page 43 of 69
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