Conditioning technique for lightning surge invaded from ground using pressured buildng material salked by conductive water

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05953
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Tokai University
• Principal Investigator: Okano Daisuke 東海大学, 熊本教養教育センター, 教授 (00169129)
• Project Period (FY): 2015-10-21 – 2018-03-31
• Keywords: 落雷 / 高層ビル / コンクリート / 内部雷保護 / 高圧気相 / 雷サージ調整

Outline of Final Research Achievements

Through lightning room tests invaded into junction concrete gap simulated specific cracks on concrete parapets of high tall buildings, the consideration results are as follows; ①the normalized discharged charge at p≦5.0atm is reduced by 39% and 52% for positive and negative discharges, respectively, ②discharge impedance (Zd) less than f=200kHz is approximated to an R-L series circuit and each element value is estimated as R≦500Ω and L≦450μH in the front duration in positive discharges, and R≦450Ω and L≦280μH in the front duration in negative discharges, while R and L values simultaneously decrease by 1/50 more than the front duration in positive and negative discharges, ③a parallel circuit with R//C has functions such as conditioning waveforms, suppressing noise amplitudes and reducing discharge period by 1/4 in the maximum through simulated lightning discharges in an atmospheric JC gap, therefore this circuit gives an possibility for lightning surge conditioning technique.

Free Research Field

電力工学、雷保護