Determination of the Operating Temperature of the Gas-Insulated Transmission Line

Tomasz Szczegielniak,Paweł Jabłoński,Dariusz Kusiak

doi:10.3390/app10248877

Tomasz Szczegielniak, Paweł Jabłoński + Show 1 more

Open Access

https://doi.org/10.3390/app10248877

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Journal: Applied Sciences	Publication Date: Dec 11, 2020
Citations: 1	License type: CC BY 4.0

Affiliation: Częstochowa University of Technology

Abstract

Gas-insulated lines (GILs) have been increasingly used as high-current busducts for high-power transmission. Temperature is one of the most important factors affecting the performance and ampacity of GILs. In this paper, an analytical method was proposed to determine the temperature of a three-phase high-current busduct in the form of a single pole GIL. First, power losses in the phase conductors and enclosures were determined analytically with the skin, and proximity effects were taken into account. The determined power losses were used as heat sources in thermal analysis. Considering the natural convection and radiation heat transfer effects, the heat balance equations on the surface of the phase conductors and the screens were established, respectively. Subsequently, the temperature of the phase conductors and the enclosures were determined. The validation of the proposed method was carried out using the finite element method and laboratory measurements.

Highlights

The growing demand for electrical energy requires a continuous expansion of the electric power infrastructure
Almost 50 years of using gas-insulated lines (GILs) in electric power infrastructure make them good candidates to be used as high-power underground transmission systems [1,2,3,4,5,6,7,8]
In the calculation of power losses, the skin and proximity effects were taken into account

Summary

Introduction

The growing demand for electrical energy requires a continuous expansion of the electric power infrastructure. Almost 50 years of using gas-insulated lines (GILs) in electric power infrastructure make them good candidates to be used as high-power underground transmission systems [1,2,3,4,5,6,7,8]. High-current GILs were often used in power generation and substation facilities as power transmission lines. Their main area of application is as a connection between the generator unit and its step-up transformer. The high-current busducts can be installed above ground, in a tunnel, trench or directly buried These installation opportunities offer a large field of possible applications inside substations and power plants or even outside as cross-country installations. In the calculation of power losses, the skin and proximity effects were taken into account

Magneto-Thermal Modeling

Numerical Example

Method

Conclusions