Lightning current online monitoring system of overhead transmission line based on differential ring

The invention provides a lightning current online monitoring system of an overhead transmission line based on a differential ring, relating to a structure of the lightning current online monitoring system of the overhead transmission line. The lightning current online monitoring system mainly comprises a current sensor, a lightning stroke signal collecting unit, a data receiving and GPRS (General Packet Radio Service) transmission unit, a power supply unit and a user unit. With the adoption of the lightning current online monitoring system provided by the invention, lightning current of the overhead transmission line is monitored online in a non-contact manner. The lightning current online monitoring system has the advantages of being safe to use, reliable in work, intelligent in operation, high in monitoring accuracy, high in sensitivity and high in precision, can help staff to rapidly troubleshoot a lightning fault of the overhead transmission line to reduce loss, and has the characteristics of simple circuit structure, low cost and convenience in popularization and application and the like. The lightning current online monitoring system provided by the invention can be widely applied to the lightning current online monitoring system of the overhead transmission line, and is particularly suitable for the lightning current online monitoring system of the 110-500 kV high-voltage overhead transmission line.