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The characteristic of load voltage and zero line voltage is studied when the zero line disconnection occurs in three-phase distribution system. The theoretical analysis show that: zero- sequence voltage is appeared at the neutral point when the zero line disconnection occurs, and the size of zero-sequence voltage is relation to the load unbalance. The greater the load unbalance is, the greater the zero-sequence voltage. Based on this characteristic, a new methods to detect zero line disconnection is presented based on zero sequence voltage with zero line current blocking, an example prove that the method is feasible.

The Effect to Single-phase Load and Countermeasures of Zero Line Disconnection