Chapter 1) 7SR23 DAD Description Of Operation
©2013 Siemens Protection Devices Limited
Chapter 1 Page 18 of 36
3.2
Protection: Measured Earth Fault (50G)
The earth current is measured directly by the earth current input. These elements utilise either the true RMS
current or the fundamental frequency RMS current (50 or 60Hz).
Two instantaneous measured earth fault elements are provided.
Each element has an independent
50G-n Setting
setting to define the pick-up current
Each element has an independent
50G-n Delay
setting to define the operate time delay after pick-up.
The 50G elements have transient free operation.
Operation of the instantaneous earth fault elements can be inhibited from:
Inhibit 50Gn
A binary or virtual input.
EF In/Out Switching
Control Menu selection
User Inhibit
Reylogic (graphical logic)
Figure 3-3
Logic Diagram: Measured Earth Fault Element
Summary of Contents for 7SR23 DAD
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