Impact of a lightning strike on a low voltage transmission line: A case study from Fujel Gorkha, Nepal

Abstract

A case study on the property damage incurred by a lightning strike to a low-voltage transmission system in Fujel, a rural village of Gorkha, Nepal has been presented. The study aims at analyzing the extent of economic loss and investigates the nature of the impact. A lightning ground flash reportedly struck a low-voltage distribution line. The current travelled along the line towards the nearest post and entered the soil puncturing the base of the post. Fifteen newly installed electric meters were damaged out of which 3 were blown apart. Similarly, 5 television sets, and over 100 electric lamps were also damaged. A goat tamed in a wooden cage along with 10 others was also found dead after the lightning incident. Altogether, 20 households were affected by the strike incurring an estimated financial loss of about NPR 655,500 (approximately USD 6,000.00).A closer inspection of the affected houses and their electrical installations revealed that none of the houses had protective measures against lightning and even the TT wiring did not have an earthing system for the low-voltage electrical installation. This study reflects the level of vulnerability of the households in rural Nepal pertinent to lightning and electrical hazards.