A voltage-based detection method for lightning discharges at distribution networks

Abstract

Overhead distribution networks, due to its exposed nature, are susceptible to the incidence of Lightning Discharges (LD), especially in rural areas. One way commonly employed by power utilities to detect this phenomenon is by using lightning detection systems based on electromagnetic interference propagation. However, these systems do not normally allow for an accurate conclusion if a lightning strike has occurred in a particular feeder. Therefore this paper presents a methodology for detecting such disturbances by measuring voltages at the substation. The scheme is based on a combination of Park and Wavelet transforms applied to these signals. The paper presents a detailed modeling of the IEEE 34 bus test feeder specific for lightning discharges studies. The results show that with the signature of the LD within the measured signals it is possible to detect the transients associated with. This information can be used as a complement of the traditional meteorological based detection systems.