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Medium voltage products Technical guide Protection ...· PDF file17 5. Short-circuit 19 6. Status of the neutral 19 6.1 Isolated neutral 20 6.2 Solidly grounded neutral 20 6.3 Neutral grounded by means of resistance 20 6.4 Neutral grounded by means of impedance (Petersen coil) 20 6.5 Measurement of the ground fault current and identification of the faulted phase 22 7. Protection relay codes 24 8.

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