Effect of Altitude on Clearance of Gap Device Paralleled with Insulator String
Liu Nen · Insulators and Surge Arresters · 2015
Installing parallel gap device beside the insulator string is typical measures of dredging lightning protection. The clearance of parallel gap device may be effected by the altitude. The standard negative polarity lightning flashover characteristics for X-70 suspension insulator string and parallel gap devices are tested at Kunming and Changsha. The normal probability distribution method is adapted to achieve the discharge voltage of corresponding breakdown probability. The insulation co-ordination is done from the point of breakdown probability, so the beat gap distances of parallel gap device at two areas are gotten, respectively. It can be found that as the altitude increasing, the gap clearance also increase.