GHAI AO TONG Propagation path Zw [] [mlμs】 Simple current conductor 430 250 Bundled conductor 330 265 Lightning shield wire 470 240 Cable 10-40 150-200 Underground conductor 170 100 电气工程基础国家精品课程Underground conductor 170 100 150 – 200 10 – 40 Cable 240470Lightning shield wire 265330Bundled conductor 250430Simple current conductor v [m/μs] Zw [Ω] Propagation path