| Types of fault | Formula for apparent impedance calculation ( |
| “A” phase-ground fault |
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| “B” phase-ground fault |
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| “C” phase-ground fault |
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| “A” phase-“B” phase-fault/“A” phase-“B” phase-ground fault |
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| “B” phase-“C” phase-fault/“B” phase-“C” phase-ground fault |
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| “C” phase-“A” phase-fault/“C” phase-“A” phase-ground fault |
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