Siemens Argus 7SR21 Technical Manual page 541

P.U.
D.O.
Ph. Dir
&
TIMING
E
TESTS
Calculated Timing values in seconds for TM =1.0
Curve
IEC-NI
IEC-VI
IEC-EI
IEC-LTI
ANSI-MI
ANSI-VI
ANSI-EI
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
1.1.1.1 Element Blocking
The Derived Earth Fault elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector
operation. The Characteristic can be made non-directional by VT Supervision. This functionality should be
checked.
Element
51N-1
51N-2
51N-3
51N-4
50N-1
50N-2
50N-3
50N-4
© 2013 Siemens Protection Devices Limited
Char.
Is
(NI EI VI LTI, TM
(A)
DTL)
2 xIs
10.03
13.50
26.67
120.00
3.80
7.03
9.52
BI Inhibits
7SR210 & 7SR220 Commissioning & Maintenance Guide
Operate Current
P.U. D.O.
Tol
(Amps) (Amps)
VTS action
Operate Time
2 x Is 5 x Is
Tol
(sec) (sec)
5 xIs
4.28
3.38
3.33
30.00
1.69
1.31
1.30
Inrush Detector
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