All-fiber optical current transformer for measuring lightning current

Abstract

It is an important part for studying lightning to measure lightning current. Consequently, this paper studied an all-fiber optical current transformer for measuring lightning currents. Firstly, the basic principle and structure of the all-fiber optical current transformer were introduced. Then, the performances including the response speed, measurement accuracy and measurement range were tested in the laboratory. The results show that the response speed of the sensor is in microsecond. The measurable range is over 1 kA~100 kA. The dynamic range is greater than 40 dB and the measurement error is less than 5%. The measurement waveform of all-fiber optical current transformer coincides with that of standard Pearson current probe. The paper provides a new method for lightning current measurement.