7SR210 & 7SR220 Commissioning & Maintenance Guide
Page 72 of 82 © 2013 Siemens Protection Devices Limited
Inject 1 A of balanced current. Gradually increase imbalance current, operating level should be as follows:
46BC Setting
1P unbalance current
(% of 3P current)
20% 75%
25% 100%
30% 129%
35% 161%
40% 200%
46BC Setting 3P balanced current (A) 1P unbalance current (A)
Measured Unbalance
current
Apply 1 A 1P unbalance current without 3P balanced current. Measure 46BC operating time.
46BC Delay setting Measured
3.4.1 ELEMENT BLOCKING
The Broken Conductor element can be blocked by Binary Input Inhibit. This functionality should be checked.
Element BI Inhibits
46BC
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