Abstract
In the present paper, the electromagnetic coupled heat transfer and ultrasonic propagation in a 252 kV three-phase GIS busbar chamber were numerically studied by using the finite element method. The electromagnetic loss and distributions of SF6 gas velocity, temperature, and breakdown margin in the GIS busbar chamber were carefully analyzed, and the influences of SF6 gas velocity and temperature variations on ultrasonic propagation performances in the GIS chamber were discussed in detail. It is found that the SF6 gas breakdown margin in the GIS busbar chamber is mainly affected by the electric field intensity. When I = 3300 A and U = 1050 kV, the minimum SF6 gas breakdown margin in the GIS busbar chamber is 7.98 kV/mm, which is located at top of busbar conductor A, where the thermal breakdown risk is relatively high. Furthermore, it is noted that, when natural convection in GIS busbar chamber is weak, the influences of SF6 gas velocity and temperature variations on sound propagation would be insignificant. For this case, when acoustic propagation simulation is performed, the SF6 gas would be assumed to be stationary and its temperature would be set to the average gas temperature of natural convection in the GIS chamber, which would be beneficial to reduce the computational time and maintain the simulation accuracy as well.
Highlights
Gas-insulated switchgear (GIS) is a high-voltage sealed switchgear that combines high-voltage electrical equipment together according to the main electrical connection, including circuit breakers, disconnectors, earthing switches, mutual inductors, busbars, and arresters
Erefore, in the present paper, the electromagnetic coupled heat transfer and ultrasonic propagation in a 252 kV three-phase GIS busbar chamber were numerically studied by using finite element method. e electromagnetic loss and distributions of SF6 gas velocity, temperature, and breakdown margin in the GIS busbar chamber were carefully analyzed, and the influences of SF6 gas velocity and temperature variations on ultrasonic propagation performances in the GIS chamber were discussed in detail. e present study would be helpful for further understanding electromagnetic coupled heat transfer and ultrasonic propagation in the GIS busbar chamber, and it would be useful for the simplification of ultrasonic propagation computations
It shows that, when high frequency alternating current is applied to busbar conductors, a variating magnetic field will be induced around the conductors and the induced current will be generated, which would lead to nonuniform current distribution on conductor cross section and result in skin effect
Summary
Gas-insulated switchgear (GIS) is a high-voltage sealed switchgear that combines high-voltage electrical equipment together according to the main electrical connection, including circuit breakers, disconnectors, earthing switches, mutual inductors, busbars, and arresters. Kim et al [6] and Kim et al [7] have proposed a magnetic-thermal coupling finite element method to predict the temperature rise of GIS busbar. In their studies, the loss obtained from. The concept of gas breakdown margin was proposed, and the variations of SF6 gas breakdown margin were numerically studied with multiphysical coupling simulation method under different busbar working conditions It showed that both the busbar through-current temperature rise and very fast transient phenomenon would lead to nonuniform distributions of local electric field intensity in the busbar, cause discharge, and make SF6 gas breakdown. Erefore, in the present paper, the electromagnetic coupled heat transfer and ultrasonic propagation in a 252 kV three-phase GIS busbar chamber were numerically studied by using finite element method. Erefore, in the present paper, the electromagnetic coupled heat transfer and ultrasonic propagation in a 252 kV three-phase GIS busbar chamber were numerically studied by using finite element method. e electromagnetic loss and distributions of SF6 gas velocity, temperature, and breakdown margin in the GIS busbar chamber were carefully analyzed, and the influences of SF6 gas velocity and temperature variations on ultrasonic propagation performances in the GIS chamber were discussed in detail. e present study would be helpful for further understanding electromagnetic coupled heat transfer and ultrasonic propagation in the GIS busbar chamber, and it would be useful for the simplification of ultrasonic propagation computations
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