Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-13
SEL-351 Instruction Manual
Thus, the zero-sequence voltage-polarized directional element in Figure 4.9 is defeated,
nonoperational, and unavailable when the voltage inputs are delta-connected (see Figures
1.2 and 1.3).
Figure 4.7: Best Choice Ground Directional Logic
Courtesy of NationalSwitchgear.com
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