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Application Guidelines for Ground Fault Protection
3.V 2 VC-3.V 2 IA, 3.I2 VB MTA VA Reverse Fault Forward Fault Figure 2 shows the voltage and current vectors for an A-phase-to-ground fault. Phase and negative-sequence voltage and current are shown. The torque equation for a negative-sequence voltage polarized directional element is: 32QT V I V I MTA=•• ∠− −∠+22 2 2[]cos()()( )
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Commissioning of Protective Relay Systems - SEL Home
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