Abstract
Metal strands of OPGWs (composite fiber-optic ground wires) installed in overhead power transmission lines are sometimes melted and broken when struck by high-energy lightning. This paper presents the calculation results regarding OPGW strands melting behavior when struck by DC arcs simulating high-energy lightning. The calculations revealed that the melted volume of the strand was 26% of the strand volume before the arc test, i.e. the rate of the non-melted volume of the strand was 74%. On the other hand, the residual tensile strength of the melted strand was 69% of the other non-melted strands after DC arc test. These results suggest there is a strong correlation between the calculated non-melted volume of the strand and the measured residual tensile strength of the melted strand.
Highlights
Ground wires (GWs) have been used to prevent overhead power transmission lines from being struck by lightning
This paper presents the calculation results regarding optic ground wires (OPGWs) strands melting behavior when struck by direct current (DC) arcs simulating high-energy lightning
The calculations regarding the melting behavior of 60 mm2 OPGW strands when struck by DC arcs were performed, and the calculation results were compared with the test results of the residual tensile strength of the strands after DC arc tests
Summary
Ground wires (GWs) have been used to prevent overhead power transmission lines from being struck by lightning. It is important to clarify the melting and breaking characteristics of OPGW strands with a small cross-section (e.g., 60–80 mm2) as thin OPGWs have been melted and broken by lightning strikes on actual transmission lines [4, 8]. It is important for electric utilities to grasp the residual strength of OPGW which has some melted strands even if the strands are not broken. The calculations regarding the melting (not the breaking) behavior of 60 mm OPGW strands when struck by DC arcs were performed, and the calculation results were compared with the test results of the residual tensile strength of the strands after DC arc tests
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