Temperature Evolution Properties of Overhead Line Conductor Exposed to Large-scale Jet Fires Induced by High-pressure Natural Gas Leakage

Abstract

A unified model was developed from leaked high-pressure natural gas (up to 6.55 MPa) and a procedure outlined in IEEE Standard 738–2012 for transmission line conductor temperature. A real-scale case was presented to show the thermal effects of a large-scale jet fire on the nearby transmission line by setting their distances from 200 to 500 m. The predicted total flame height and damage radius correspond to the reported results with appropriate correction of input parameters. Transmission lines with higher load currents and shorter distances to the jet fire induce higher temperature rises in line conductors. Reducing the current load of transmission line needs to integrate both factors of thermal failure of transmission line and economy of power system.