Ethernet protective system

The invention relates to an Ethernet protective system. The system comprises an isolation transformer, a transient voltage suppressor (TVS) suppressing pulse train interference, a gas discharge tube limiting voltage pulse higher than 75V, an Ethernet transformer converting the voltage of an Ethernet controller into network voltage, and the Ethernet controller. The output end of the Ethernet controller is connected with the input end of the Ethernet transformer, the output end of the Ethernet transformer is connected with the input end of the gas discharge tube, the output end of the gas discharge tube is connected with the output end of the TVS, and the output end of the TVS is connected with the input end of the isolation transformer. The Ethernet protective system can effectively prevent the impact of overvoltage on an Ethernet loop, guarantees equipment to run normally in the overvoltage environment, can effectively suppress the impact of electric pulse train on the Ethernet loop, ensures normal receiving and transmitting of signals in the electromagnetic compatibility (EMC) environment, and provides guarantee for safe and normal operation of wind generating sets.