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Structure improvement of a 126 kV vacuum circuit breaker using electromagnetic-thermal field coupling simulation

Citation

Lv, Q and Yu, X and Tan, Y and Liu, Z and Wang, X, Structure improvement of a 126 kV vacuum circuit breaker using electromagnetic-thermal field coupling simulation, Applied Thermal Engineering, 160 Article 114076. ISSN 1359-4311 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier Ltd.

DOI: doi:10.1016/j.applthermaleng.2019.114076

Abstract

Overheating limits the development of high voltage vacuum circuit breakers (HVVCB) toward large current and compact size. In this paper, an electromagnetic-thermal simulation model is proposed to investigate the thermal characteristics of a 126 kV/40 kA HVVCB. This model is first validated using experimental data. Then it is used to evaluate the thermal performance of the HVVCB with the 2/3 coil-type and horseshoe-type electrodes, respectively. The comparison results showed that the resistance and temperature of the horseshoe-type electrode are much lower than those of the 2/3 coil-type electrodes. The temperature rise in the HVVCB with the horse-type electrodes is also much lower than that in the HVVCB with the 2/3 coil-type electrode. Based on the analysis, a new structure of the HVVCB is proposed by replacing the spring finger connection between the static conductive rod and its conductive support with a fixed connection. The temperature distribution in the new structure and conventional structure is analyzed and compared. The results showed that the temperature reduction at the upper end of the connection is about 23 C and at the contact surfaces of the two electrodes is about 20 C in the HVVCB at a current of 2500 A.

Item Details

Item Type:Refereed Article
Keywords:HVVCB, temperature rise, electromagnetic-thermal simulation, electrodes, contact resistance
Research Division:Engineering
Research Group:Mechanical Engineering
Research Field:Energy Generation, Conversion and Storage Engineering
Objective Division:Energy
Objective Group:Energy Transformation
Objective Field:Energy Transformation not elsewhere classified
UTAS Author:Wang, X (Associate Professor Xiaolin Wang)
ID Code:133893
Year Published:2019
Deposited By:Engineering
Deposited On:2019-07-13
Last Modified:2019-08-21
Downloads:0

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