7SR210 & 7SR220 Description of Operation
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3.9
Current Protection: Under-Current (37, 37G & 37SEF)
Two under-current elements are provided for each 37, 37G & 37SEF protection function.
Each phase has an independent level detector and current-timing element.
37-n Setting
sets the pick-up current.
An output is given after elapse of the
37-n Delay
setting.
Operation of the under-current elements can be inhibited from: -
Inhibit 37-n
A binary or virtual input, function key or remote data Comms
Figure 3.9-1 Logic Diagram: Undercurrent Detector (37, 37G & 37SEF)
3.10 Current Protection: Under-Current Guarded (37)
A level detector
37-n U/I Guard Setting
sets the pick-up current.
Figure 3.10-1 Logic Diagram: Undercurrent Guarded Detector (37)
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 ...
Page 398: ...7SR220 Technical Manual Chapter 4 Page 18 of 96 2017 Siemens Protection Devices Limited ...
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