Development of a shunt lightning current measuring system using a Rogowski coil

• A measuring system for shunt lightning current using a Rogowski coil is developed.
• Time and frequency characteristics of the synthetic measuring system are measured.
• A method to find the resonance frequency of the Rogowski coil is discussed.
• The influence of the resonance frequency on the measuring system is discussed.

Recently, the amount of lightning damage has increased with the number of lightning flashes. Therefore, it has become important to understand the features of lightning current damage to electrical and electronic equipment. At wind-turbine sites and tall antenna towers, lightning current waveforms are observed using large-scale Rogowski coils. Data related to the main current measured by the large-scale Rogowski coils and the shunt current that damages the electrical and electronic equipment are useful to establish lightning protection methodologies. In this paper, we present a system developed using a Rogowski coil to measure this shunt current.