Study on the Gas-Insulated Line Equivalent Model and Simplified Model

Botong Li, Tianfeng Gu, Bin Li and Yunke Zhang
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Botong Li: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Tianfeng Gu: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Bin Li: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Yunke Zhang: The Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China

Energies, 2017, vol. 10, issue 7, 1-14

Abstract: The gas-insulated line (GIL) is one technical solution to allow the transmission of electricity underground at a high voltage level, yet its equivalent model is quite complicated. Based on an examination of the geometrical structure of the GIL and the way the metallic enclosure is grounded, this paper analyzed the electromagnetic and electrostatic coupling among the inner conductors and the metallic enclosures of the three phases. Then, the paper proposes a modeling method for the widely-used short-distance GIL based on the PI-model (the model consisting of two lumped admittance at each terminal and a lumped impedance in between). The GIL parameters were later simplified with the coupling effect of the metallic enclosure considered, and a simplified PI-model was produced. Finally, the proposed PI-model and its simplified version were built on the Power Systems Computer Aided Design (PSCAD) platform, and their effectiveness verified by simulation results.

Keywords: gas-insulated line; ultra-high-voltage transmission line; transmission line model; PI-model; inner conductor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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