One kind of transmission line distance protection fault recognition method

The present invention provides a distance protection of transmission line fault identification, the method comprising the steps of: acquiring three-phase voltage and phase current at the mounting protection; determining positive sequence voltage relative to the reference, the positive sequence current, negative sequence current and zero sequence current; determines the current installation protection at the asymmetry; determining the angle between the positive sequence voltage and the positive sequence current; identify faults based on the current asymmetry plane. The degree of asymmetry and utilization characteristics to achieve current protection fault recognition distance, distance protection of transmission line to improve existing performance when the oscillation operation fault and overload.