Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)
- Volume 22 Issue 4
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- Pages.715-722
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- 1998
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
Electro-thermal analysis of contacts and connections in VCB under high electric current by finite element methods
유한요소법에 의한 VCB 접속부의 대전류에 대한 전열해석
- Kang, Woo-Jong (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
- Huh, Hoon (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
- Kang, Kyeong-Rok
- Published : 1998.04.01
Abstract
A large electric system of a vacuum circuit breaker(VCB) has been studied for the electro-thermal analysis by finite element methods. Since the heat generation in VCB causes not only energy loss but deterioration of the VCB system with oxidization of parts, the overheating of the system must be prevented. For the analysis, a finite element formulation is derived for both electric analysis and thermal analysis that are coupled together. Two sets of formulations are uncoupled after finite dimensional approximation. First, the electric potential is obtained for the entire field and scaled to the given electric current. The electric field obtained is then used to calculate the heat generation in the VCB system including contacts and connections for the calculation of the temperature distribution in the entire domain. The finite element analysis is carried out to study the effect of shapes and locations of contacts and connections. From the results, the existing VCB has been modified to enhance its capacity with reduction of heat generation and temperature elevation.