Protection: Measured Earth Fault (50G); Figure 3-3 Logic Diagram: Measured Earth Fault Element - Siemens 7SR23 DAD Manual

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
EF In/Out Switching
User Inhibit
Figure 3-3
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A binary or virtual input.
Control Menu selection
Reylogic (graphical logic)
Logic Diagram: Measured Earth Fault Element
Chapter 1) 7SR23 DAD Description Of Operation
Chapter 1 Page 18 of 36