Siemens 7SR21 Manual page 64

46BC Setting
20%
25%
30%
35%
40%
46BC Setting 3P balanced current (A)
Apply 1A 1P unbalance current without 3P balanced current. Measure 46BC operating time.
46BC Delay setting
3.4.1.1 Element Blocking
The Broken Conductor element can be blocked by Binary Input Inhibit. This functionality should be checked.
©2010 Siemens Protection Devices Limited
Element
46BC
7SR21 & 7SR22 Argus Commissioning and Maintenance
1P unbalance current
(% of 3P current)
75%
100%
129%
161%
200%
1P unbalance current (A)
Measured
Measured Unbalance
current
BI Inhibits
Chapter 6 Page 64 of 69