Current Protection: Under-Current (37); Figure 3.8-1 Logic Diagram: Undercurrent Detector (37) - Siemens 7SR224 Technical Manual

3.8

Current Protection: Under-Current (37)

Two under-current elements are provided.
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
37-n
Enabled
Disabled
Inhibit 37-n

Figure 3.8-1 Logic Diagram: Undercurrent Detector (37)

©2010 Siemens Protection Devices Limited
A binary or virtual input.
37-n Setting
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c
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IL1
<
IL2
<
IL3
7SR224 Argus Description of Operation
37-n Delay
1
37-n
Chapter 1 Page 32 of 70