Parameter: 46BC-n Setting
•
Default setting: 20 %
If the negative phase sequence current is above this percentage of the positive sequence current the
46BC-n element will pickup.
Parameter: 46BC-n Delay
•
Default setting: 20 s
This is the delay applied to the 46BC-n operated output. This delay is used to prevent nuisance indications
which would otherwise occur during switching operations and system faults.
Settings Example
Where very low phase currents are measured, correct operation of the broken conductor function may be
unreliable e.g. it may operate for unbalanced loads. The operation of the broken conductor function can be
blocked during periods of low system loading by using the undercurrent guard feature.
Settings Menu
Functions > Function Config
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
46BC Open Circuit Enabled
Disabled
Disabled
Functions > Protection > 46BC >Gn 46BC Common
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
UC Guard Setting 0.05 to 5 ⋅ I
rated
Δ 0.05 ⋅ I
rated
0.1 ⋅
I
rated
Functions > Protection > 46BC > 46BC-n
Parameter Range Settings
Default Gn1 Gn2 Gn3 Gn4
Element Enabled
Disabled
Disabled
Setting 20 to 100 %, Δ 1 % 20 %
Delay 0.03 to 20 s Δ 0.01 s
20 to 100 s Δ 0.1 s
100 to 1000 s Δ 1 s
1000 to 10000 s Δ 10 s
10000 to 14400 s Δ 100 s
20 s
UC Guard Inhibit Yes
No
No
5.8.5
Protection and Automation Functions
5.8 46BC Broken Conductor Detection
192 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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