Method for judging line fault by using node current subjected to time base synchronization

The invention belongs to the technical field of detection of circuit fault, and provides a method for judging line fault by using node current subjected to time base synchronization. The method comprises the following steps of: synchronizing time bases of all nodes by a global position system (GPS) and monitoring the characteristics of zero-sequence current of each node at the fault moment of the power transmission and distribution line; and comparing the characteristics of the zero-sequence current of each node of the power transmission and distribution line at the same moment to accurately judge whether the power transmission and distribution line is failed or not so as to further determine the fault types of the power transmission and distribution line. The method is suitable for an ungrounded system, a resistance grounded system, and a resonance grounded system and reduces the complexity of fault analysis and judgment of the power transmission and distribution line.