Current Protection: Under-Current (37); Figure 4.7-1 Logic Diagram: Relays With 4 Current Inputs Undercurrent Detector (37); Figure 4.7-2 Logic Diagram: Relays With 1 Current Inputs Undercurrent Detector (37) - Siemens Solkor 7PG2113 Technical Manual

4.7

Current Protection: Under-Current (37)

Two under-current elements are provided 37-1 & 37-2.
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

Figure 4.7-1 Logic Diagram: Relays with 4 Current Inputs Undercurrent Detector (37)

Figure 4.7-2 Logic Diagram: Relays with 1 Current Inputs Undercurrent Detector (37)

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7PG2113/4/5/6 Solkor Description of Operation
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Chapter 1 Page 52 of 80