Broken Conductor (46Bc); Figure 5-4 Logic Diagram: Ct Supervision Function (60Cts) - 7Sr12; Figure 5-5 Logic Diagram: Broken Conductor Function (46Bc) - Siemens 7SR12 Argus Manual

Enabled
Disabled
VL1
NPS
VL2
V2
Filter
VL3
IL1
NPS
IL2
Filter I2
IL3
Figure 5-4 Logic Diagram: CT Supervision Function (60CTS) – 7SR12

5.4 Broken Conductor (46BC)

The element calculates the ratio of NPS to PPS currents. Where the NPS:PPS current ratio is above 46BC
Setting an output is given after the 46BC Delay.
The Broken Conductor function can be inhibited from
Inhibit 46BC
46BC U/I Guard
46BC Element
Enabled
Disabled
Inhibit 46BC
46BC U/C 46BC U/C Guard
Guarded
Setting
Yes
C
No
IL1
IL2
IL3

Figure 5-5 Logic Diagram: Broken Conductor Function (46BC)

©2017 Siemens Protection Devices Limited
60CTS Element
&
Inhibit 60CTS
60CTS Vnps
<
&
60CTS Inps
>
A binary or virtual input.
A minimum load current
IL1
NPS
IL2
Filter
IL3
IL1
PPS
IL2
Filter
IL3
7SR11 & 7SR12 Description Of Operation
60CTS Delay
&
46BC Setting
&
c
I2
I1
60CTS Operated
46BC Delay
46BC
Chapter 1 Page 77 of 88