Single-phase Disconnection Fault Location for Distribution Network Based on Voltage Imbalance of Distribution Transform

For the problem of Single-phase disconnection fault, which is difficult to detect in the distribution network, the 10kV bus voltage of the substation to which the disconnection fault belongs, and the three-phase voltage of the distribution transformer before and after the fault point are analyzed firstly. Then, a Single-phase disconnection fault location for distribution network based on voltage imbalance of distribution transform is proposed based on the above analysis. The imbalance of 10kV bus voltage is set as starting criterion in this method, and the three-phase voltage unbalance of all distribution transformers under the bus are calculated through Electricity Information Acquirsition System, which the distribution transformer can be divided into the abnormal one and the normal one, the disconnection position would be located based on the topology relationship of the grid in the Distribution Network Diagram System. Finally, operation and backtracking of historical data show that, the fault position can be located accurately, and the difficulty of fault checking could be reduced greatly.