Thermal Analysis of AC Contactor Using Thermal Network Finite Difference Analysis Method

Chunping NIU  Degui CHEN  Xingwen LI  Yingsan GENG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.8   pp.1286-1291
Publication Date: 2008/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.8.1286
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices(Selected Papers from IS-EMD2007))
Category: Contactors & Circuit Breakers
Keyword: 
AC contactor,  thermal analysis,  thermal network,  finite difference method,  

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Summary: 
To predict the thermal behavior of switchgear quickly, the Thermal Network Finite Difference Analysis method (TNFDA) is adopted in thermal analysis of AC contactor in the paper. The thermal network model is built with nodes, thermal resistors and heat generators, and it is solved using finite difference method (FDM). The main circuit and the control system are connected by thermal resistors network, which solves the problem of multi-sources interaction in the application of TNFDA. The temperature of conducting wires is calculated according to the heat transfer process and the fundamental equations of thermal conduction. It provides a method to solve the problem of boundary conditions in applying the TNFDA. The comparison between the results of TNFDA and measurements shows the feasibility and practicability of the method.