Observation of lightning effect on power distribution lines by still cameras

Abstract

In order to clarify the cause of lightning outages of a distribution line, simultaneous observation of lightning discharge channels and types of damage on distribution lines were carried out with still cameras from July 1993 through July 1995. High‐voltage lines located in the observation area did not suffer from induced voltages due to indirect lightning strikes, even if such lightning strikes were nearby. One instance of a direct lightning strike on a distribution line was observed. The striking point was the span center of the overhead ground wire, and only a transformer fuse was blown on the high‐voltage line. Damage to surge arresters was observed in the case of a lightning strike on a building located near a distribution line. The cause is thought to have been lightning current which flowed into the nearby distribution line through the damaged arresters. © 1997 Scripta Technica, Inc. Electr Eng Jpn 119(1): 17–23, 1997

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

“…C., of which distance from the Sea of Japan is about 10 km and the height above the sea level is about 400 m. Taking account of the characteristics of winter lightning strokes, which are concentrated on high structures, several lightning strokes to these facilities are expected. Observation have been conducted by four still cameras equipped with liquid crystal shutter [7] and six lightning current waveshape recording systems by rogowski coil, which are referred to as "lightning surge memory". Fig.…”

Study concerning production of lightning overvoltages on low-voltage power distribution lines

“…Lightning strike observations (hereafter, camera observations) were implemented for power distribution lines using 50 still cameras from July 1993 in the Tonami area of the observation region [9]. Sites A and B of the present observations of lightning overvoltages were in the highvoltage system identical to the camera observation area.…”

“…However, in Nos. 2 and 6, part of the lightning current flowed back [9] to the high-voltage power distribution lines after damaging the arrester near the location of the lightning strike. In such cases, the expectation was that the arrester would function over a very wide range and that current would flow to the ground of the overhead earth wires.…”