A development of a shunt lightning current measuring system using a Rogowski coil

In recent years, the number of lightning damages has been increased with that of lightning flashes. Therefore, it has become important to understand the features of lightning current damaging electrical and electronics equipment. At the sites of wind turbines and tall antenna towers such as TOKYO SKYTREE^@, lightning current waveforms are observed using large-scale Rogowski coils. Data of not only the main current measured by the large-scale Rogowski coils but also the shunt current damaging electrical and electronics equipment are useful to establish lightning protection methodologies. In this paper, we present the developed system using a Rogowski coil to measure such shunt current.