Siemens 7SR12 Argus Manual page 311

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.
2.7.3.1 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
©2017 Siemens Protection Devices Limited
7SR11 & 7SR12 Commissioning and Maintenance Guide
2 xIs
10.03
13.50
26.67
120.00
3.80
7.03
9.52
BI Inhibits VTS action
5 xIs
4.28
3.38
3.33
30.00
1.69
1.31
1.30
Inrush Detector
Chapter 6 Page 27 of 72