Protection plan for medium voltage public distribution networks: implementation : Earth-fault protection for radial networks with low-impedance neutrals

Earth-fault protection for radial networks with low-impedance neutrals
Protection plan for medium voltage public distribution networks: implementation

Author : Michel ODDI

Publication date: December 10, 2023 | Lire en français

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4. Earth-fault protection for radial networks with low-impedance neutrals

4.1 Current flow in the event of ground faults

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4.1.1 Equivalent zero-sequence diagram

Before tackling protection settings, it's essential to understand the flow of currents that a stable earth fault causes in the network. The diagram at 11 illustrates this flow in the case of an open fault: the voltage of the faulted phase with respect to earth is zero, and the voltages of the healthy phases become equal to the compound...

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Earth-fault protection for radial networks with low-impedance neutrals