Current Protection: Undercurrent (37); Figure 3-10 Logic Diagram: Undercurrent Detector (37) - Siemens 7SR17 Rho Manual

3.2 C P
URRENT
Two rms measuring under-current elements are provided.
Each phase has an independent level detector and current-timing element. Gn 37-n Setting sets the pick-up
current. An output is given after elapse of the Gn 37-n Delay setting.
Operation can be selected for any phase or all phases using Gn 37-n Start Option
Operation of the under-current elements can be inhibited from:
Inhibit 37-n
Gn 37-n U/C Guarded
©2014 Siemens Protection Devices Limited
: U
ROTECTION NDERCURRENT
A binary or virtual input
Operation of the undercurrent guard function

Figure 3-10 Logic Diagram: Undercurrent Detector (37)

Chapter 1) 7SR17 Rho Description Of Operation
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