In view of the failure of data channel-based synchronization method to adapt to the communication route variation using a fiber optic self-cure ring network

a synchronization algorithm based on the distributed parameter line model is proposed to overcome the above limitation. This method consists in calculating the current phase or voltage phase modules at each of the two ends of the transmission line at the relay location

respectively

which is used as the basis of data synchronization comparison. By combining phase comparison with data revision

the data will be synchronously processed. Characterized by quick synchronization of sampled data and freedom from the influences of communication route variation

transmission line parameter variation and harmonics

this method is capable of resolving the data synchronization for current differential protection using the fiber optic self-cure ring network. The results of ATP simulation and experimental tests show that the method proposed is valid and can satisfy the synchronization accuracy requirements of current differential protection.