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As electronic transformer with low sample rate cannot meet the needs of power fault location accuracy, high-frequency signal acquisition and transmission technology is introduced. Current signal of power grid was converted to low voltage signal with 90°angle ahead by Rogowski coil in electronic transformer, which was compensated by the subsequent integrator circuit. Sample rate of signal acquisition circuit was designed to be 2 MSps. Sample data were read via LVDS interface, processed and buffered with FIFO by FPGA. Due to the mass traveling-wave data, instead of 100 M Ethernet, gigabit Ethernet was used. Frames of special form were transmitted to traveling-wave location devices. Technical difficulties such as integration saturation due to input bias voltage of operational amplifier, and small measuring range of high-speed ADC, were solved. Experiment result showed that this design of signal acquisition and transmission meet the needs of location accuracy and has some engineering value.