Seller: liu xing, Nanjing, JS, China
paperback. Condition: New. Paperback. Pub Date: 2012 Pages: 19 in Publisher: China Electric Power Press QGDW 672-2011 minefield grading standards minefield maps drawn rules provisions minefield grading criteria grid of lightning damage risk classification principles to flash density maps the grid of lightning damage risk maps drawn. This standard applies to monitoring data based on the large number of lightning monitoring network ground flash density maps. 220kV and above voltage level grid of lightning damage risk map.