Low-cost Systems for Measurement of Lightning-Currents Provided with Remote Access

This paper presents the fundamental aspects of low-cost measuring systems developed for recording current waveforms of lightning flashes by using two different principles. Such principles are based on non-direct and direct measurement, performed by a loop antenna and Rogowski coil, respectively. A Digital Signal Processor (DSP) supports data acquisition. Accurate parameters, such as peak and time parameters of return stroke currents, can be promptly determined from the records. The low-cost systems include means for remote internet access, self-test and data transfer. Laboratory test have been performed to assess the consistency of the measuring system and results were presented. Three non-direct measuring systems were installed 15 m away from the instrumented tower of Morro do Cachimbo Station (MCS). They recorded the current waveform of a single return stroke of a recent strike to the tower, which was compared to that recorded by the accurate measuring system of MCS.