実規模配電線雷サージ特性の測定と配電線解析モデルの検証

摘要

For distribution lines in Japan, protection measures against lightning induced overvoltages have been taken and can be considered almost complete. The focus of lightning protection measures has moved to overvoltages due to direct lightning strokes. Studies of such overvoltages require simulations using the EMTP (Electro-Magnetic Transients Program), and components of a distribution line must be modeled appropriately in the EMTP simulation environment. The authors have proposed an EMTP model of a distribution line in a separate paper.rnThis paper consists of two parts. The first part presents surge characteristics of a distribution line obtained by measurement using an actual-scale test distribution line. Especially, the result reveals noteworthy characteristics of the surge impedance of a reinforced concrete pole and the wavefront-time dependence of insulator voltages. The second part presents validation of the distribution line model previously proposed by the authors. The validation shows that the distribution line model accurately reproduces the measured voltage and current waveforms for various wavefront times of injected currents.%配電設備は電力流通設備の末端に位置しており，供給支rn障事故が直接需要家の停電に繋がるため，配電設備の事故防rn止は電気事業者にとって重要な課題の一つである。6.6kVrn系統の高圧架空配電線（以下，単に「配電線」と記す）の事rn故においては，雷によるものが高い比率を占めており，配電rn線の雷害防止技術に関する調査・研究が行われてきた。