GE D30 Instruction Manual page 422

9.1 DISTANCE ELEMENTS
Reactance difference angle = | –3.9° – 24.8° | = 28.7°  75°
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Zero-sequence difference angle = | –19.8° – 0.0° | = 19.8°  75°
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Negative-sequence directional difference angle = | –19.8° – 0.0° | = 19.8°  75°
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Right blinder difference angle = | –93.0° – (–109.2°) | = 16.2°  90°
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Left blinder difference angle = | 82.9° – 108.7° | = 25.8°  90°
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Fault-type comparator difference angle = | 19.8° – 19.8° | = 0.0°  50°
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All six comparators and the overcurrent supervision are satisfied.
The Quad Phase A ground element will operate for this fault.
9
9-10 D30 Line Distance Protection System
9 THEORY OF OPERATION
GE Multilin