Numerical Analysis of a Spiral Tube Damping Busbar to Suppress VFTO in 1000 kV GIS

Gas insulated substations (GISs) are broadly used for transmission and distribution in electric power networks. Very fast transient overvoltage (VFTO) caused by SF6 discharge during switching operations in a GIS may threaten the insulation of electrical equipment. In this paper, a novel VFTO suppres...

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Published in:Applied sciences 2019-12, Vol.9 (23), p.5076
Main Authors: A. Almenweer, Reem, Su, Yi-Xin, Xixiu, Wu
Format: Article
Language:English
Subjects:
Busbars
Damping
Electric power
Electric power distribution
Electric power transmission
Electrical equipment
Electrical transmission
Inductance
Insulation
Investigations
Numerical analysis
Substations
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creator A. Almenweer, Reem
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Xixiu, Wu
description Gas insulated substations (GISs) are broadly used for transmission and distribution in electric power networks. Very fast transient overvoltage (VFTO) caused by SF6 discharge during switching operations in a GIS may threaten the insulation of electrical equipment. In this paper, a novel VFTO suppression method with great prospects in engineering, called the spiral tube damping busbar, is proposed. The suppressing mechanism of the new method is analyzed. The structure and the design characteristics of the damping busbar are introduced as well. Moreover, a calculation method for the self-inductance of the damping busbar at high frequency is presented. According to the structural characteristics of the damping busbar, the inductance effect on suppressing VFTO is analyzed. A further improvement in damping VFTO is investigated by designing a spiral litz coil connected in series with the busbar, which increases the damping effect. The simulation results show that the improved damping busbar has a significant suppressing effect on the amplitude and the frequency of VFTO.
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subjects Busbars
Damping
Electric power
Electric power distribution
Electric power transmission
Electrical equipment
Electrical transmission
Inductance
Insulation
Investigations
Numerical analysis
Substations
title Numerical Analysis of a Spiral Tube Damping Busbar to Suppress VFTO in 1000 kV GIS
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