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Phas
Is
DTL
e
(Amps)
(sec)
I
(I
)
L1
A
I
(I
)
L2
B
I
(I
)
L3
C
I4(I
)
G
2.12.1.1
Element Blocking
The Undercurrent elements can be blocked by Binary Input Inhibit. This functionality should be checked.
37G-1 or 37SEF-1
37G-2 or 37SEF-2
2.12.1.2
Element Blocking from current guard
The elements can be blocked by undercurrent guard function. This functionality should be checked.
Element
37-1
37-2
Check correct phase indication, trip output, alarm contacts, waveform record.
©2017 Siemens Protection Devices Limited
P.U. Current
Amps
Element
37-1
37-2
7SR11 & 7SR12 Commissioning and Maintenance Guide
Tolerance
Operate Time
0.5 x Is
Guard Setting
Tolerance
BI Inhibits
Blocked
Chapter 6 Page 43 of 72
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