变电站设计常用电气计算-直击雷保护范围计算

防雷计算一单只避雷针2#1~2避雷针〔1〕h=30m避雷针高度P1=1如h1≤30m,P1=1;如h130m,P1=5.5/SQRT(h1)5.5/SQRT(h1)hx=9m被保护物高度r=27m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1〔2〕h=37m避雷针高度P1=0.9042如h1≤30m,P1=1;如h130m,P1=5.5/SQRT(h1)5.5/SQRT(h1)hx=5m被保护物高度r=41.141m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1二多只避雷针联合保护范围：1.#1,#2,#3针〔1〕#1避雷针h1=38m避雷针高度（等高）#2避雷针h2=38m避雷针高度d=142.9m两针间距离P1=0.8922如h1≤30m,P1=1;如h130m,P1=5.5/SQRT(h1)P2=0.8922如h2≤30m,P2=1;如h230m,P2=5.5/SQRT(h2)hx=10.5m被保护物高度r1=32.12m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1r2=32.12m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1ha=27.5m如h1h2,ha=h1-hx;否则为h2-hx.D`=142.9m如h1h2,D=d-h2+h1;否则为D=d-h1+h2P=0.8922如h1h2,P=P1;否则P=P2H0=15.12如果h1〈h2，H0=h1-D/7P，否则H0=h2-D/7Pbx=6.9294如hx〉h0/2,bx=1.5(h0-hx);否则bx=1.5*h0-2*hx〔2〕#1避雷针h1=91.7m避雷针高度(高针)（不等高）#3避雷针h2=38m避雷针高度(矮针)d=88.5m两针间距离P1=0.5744如h1≤30m,P1=1;如h130m,P1=5.5/SQRT(h1)P2=0.8922如h2≤30m,P2=1;如h230m,P2=5.5/SQRT(h2)hx=14.5m被保护物高度r1=62.346m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1r2=24.982m当hx≥0.5h1时,r1=(h1-hx)P1;当hx0.5h1时,r1=(1.5h1-2hx)P1ha=23.5m如h1h2,ha=h1-hx;否则为h2-hx.全所防直击雷保护范围计算第1页，共3页防雷计算P=0.5744如h1h2,P=P2;否则P=P1D`=53.149m当h2＞0.5h1时,,D'=d-(h1-h2)p;否则为D'=d-(1.5h1-2h2)pH0=29.49如果h1〈h2，H0=h1-D/7P2，否则H0=h2-D/7P2bx=15.235如hx〉h0/2,bx=1.5(h0-hx);否则bx=1.5*h0-2*hx第2页，共3页防雷计算第3页，共3页