Lightning Protection Methods for Customer's Facilities Located in Mountainous Areas Facing The Sea of Japan

Abstract

Surge arresters which installed at customers facilities and distribution lines are often damaged by winter lightning in mountainous areas facing the Sea of Japan. Therefore we have observed the lightning performance at a mountainous area, since 1998, in order to verify the effective lightning protection methods for customer's facilities and distribution lines. Based on the observation data and analysis results using the EMTP, we propose the effective lightning protection methods for customer's facilities.(1) When grounding resistance of a customer's facility is less than 10 S2, lowering the grounding resistance is one of the effective lightning protection methods for preventing a customer's arrester failure.(2) It is effective for preventing a customer's arrester failure that grounding of a customer's facility is connected with an overhead ground wire of a distribution line through an earth wire, and it dose not increase a failure probability of a distribution arrester.keywords:lightning, power distribution line, surge arrester, lightning protection method

An experimental study on fire ignition in collector cable in wind power generation system caused by direct lightning strike

“…SPDs in window towers are reported to be burned by winter lightnings 6 . In addition, lightning strikes on customers’ equipment (backflow strikes) are accompanied by high energy flowing to distribution lines due to low grounding resistance, and damages to power distribution equipment were confirmed 14 Arresters were observed to burn out due to lightning strikes on blades 15 . Thus, a rise in ground potential is an important issue in the lightning protection design of wind power plants.…”

Study on Lightning Protection Measures for Distribution Lines and Customer Equipment against Back Flow Lightning Current from Radio Communication Station

“…Thus, it became clear that use of overhead ground wires (OGW), including stranded wires, upgrade of discharge capacity of lightning arresters, and other measures improve back flashover protection of high‐voltage distribution lines in winter lightning areas . It was also shown that reduction of grounding resistance in equipment exposed to direct lightning strokes (hilltop loads, wind power generators, and so on) provides efficient protection of high‐voltage distribution lines from back flashover .…”