Fault Diagnosis Method for Disconnection Fault of Overhead Distribution Line Based on Power Supply Strategy of PT
Distribution network disconnection fault diagnosis is generally based on voltage or combined with voltage and current relationship,and it is assumed that three line voltages and three phase currents can be obtained,without considering the actual configuration of measuring devices.Actual overhead distribution lines are usually only configured with double PT or single PT,and can only obtain two or one line voltage,resulting in invalid of existing diagnosis methods under partial fault conditions.Firstly,the line voltage equationas under the condition of disconnection fault are established,and the feasibility of using two line voltages relation to diagnose the disconnection fault under the condition of double PT and the infeasibility under the condition of single PT are demonstrated.Secondly,a PT sliding combination power supply configuration strategy is proposed.Single PT is innovatively used for disconnection fault diagnosis,which further improves the diagnosis accuracy.Finally,PSCAD/EMTDC is used to build a medium voltage distribution line model to verify the effectiveness of the proposed power supply configuration strategy and disconnection fault diagnosis strategy.
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