7SR210 & 7SR220 Description of Operation
Unrestricted ©2018 Siemens Protection Devices Limited
Page 81 of 94
5.5
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
A binary input, virtual input or remote data Comms.
Gn 46BC U/I Guarded
Operation of the undercurrent guard function.
Figure 5.5-1 Logic Diagram: Broken Conductor Function (46BC)
5.6
Trip / Close Circuit Supervision (74TCS & 74CCS)
The relay provides three trip and three close circuit supervision elements. All elements are identical in operation
and independent from each other allowing three trip and three close circuits to be monitored.
One or more binary inputs can be mapped to
74TCS-n.
The inputs are connected into the trip circuit such that at
least one input is energised when the trip circuit wiring is intact. If all mapped inputs become de-energised, due to
a break in the trip circuit wiring or loss of supply an output is given.
The
74TCS-n Delay
setting prevents failure being incorrectly indicated during circuit breaker operation. This delay
should be greater than the operating time of the circuit breaker.
The use of one or two binary inputs mapped to the same Trip Circuit Supervision element (e.g. 74TCS-n) allows
the user to realise several alternative monitoring schemes – see ‘Applications Guide’.
Figure 5.6-1
Logic Diagram: Trip Circuit Supervision Feature (74TCS)
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
Page 2: ......
Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
Page 185: ...7SR210 Settings Guide Unrestricted 2018 Siemens Protection Devices Limited Page 61 of 61 ...
Page 277: ...7SR220 Settings Guide Unrestricted Page 72 of 107 2013 Siemens Protection Devices Limited ...
Page 382: ...7SR220 Technical Manual Chapter 4 Page 2 of 96 2017 Siemens Protection Devices Limited ...
Page 386: ...7SR220 Technical Manual Chapter 4 Page 6 of 96 2017 Siemens Protection Devices Limited ...
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