Traveling-wave signal extraction equipment and system for single-phase earth fault

The utility model discloses traveling-wave signal extraction equipment and system for a single-phase earth fault, and the equipment comprises three live display devices which are respectively connected to three high-voltage insulators of three-phase power. The equipment also comprises a resistor and three capacitors. One end of each capacitor serves as one input end which is connected with one high-voltage insulator, and the other ends of the three capacitors are connected together and serve as an output end which is grounded through the resistor, so as to obtain a traveling wave signal of the single-phase earth fault at the output end under the condition of the single-phase earth fault. According to the utility model, the equipment can effectively extract the required traveling wave signal of the single-phase earth fault. Traveling-wave signal extraction equipment, which is disposed at the lower sides of the high-voltage insulators at main and standby supply ends of a circuit, can serve as traveling wave ext