Transient Current Distribution and Force Analysis of Three Phase Enclosure Type GIB Based on Field-Circuit Coupling FEM Method

On the purpose of optimal design and online monitoring of three phase enclosure gas insulated bus (GIB), a 3-D circuit-field coupling FEM model has been developed. The current constriction effects in plug-in connectors are simulated by modeling contact bridges between contact surfaces and the influe...

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Bibliographic Details
Published in:Applied Computational Electromagnetics Society journal 2015-11, Vol.30 (11), p.1223
Main Authors: Guan, Xiangyu, Kang, Bing, Naiqiu Shu, Qiangqiang Yan, Li, Zipin
Format: Article
Language:English
Subjects:
Ablation
Circuit design
Conductors
Connectors
Contact force
Contact resistance
Coupling
Current distribution
Electromagnetic fields
Electromagnetic forces
Enclosures
Force distribution
Mathematical models
Plugs
Short circuits
Steady state
Transient current
Vibration analysis
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Summary:On the purpose of optimal design and online monitoring of three phase enclosure gas insulated bus (GIB), a 3-D circuit-field coupling FEM model has been developed. The current constriction effects in plug-in connectors are simulated by modeling contact bridges between contact surfaces and the influence of conductor gravity on contact resistance has been taken into account. The distributions of current which is constrained by external circuit are obtained from fieldcircuit coupling calculation and electromagnetic force, which is derived from electromagnetic field calculation, is used as load inputs in mechanical field analysis. The validity of calculation model is demonstrated by comparing with vibration experiments. The dynamic current distribution and electromagnetic force behaviors of three phase enclosure GIB under steady state and different short circuit conditions have been analyzed using the calculation model. Analysis results show that the uneven heating of contact fingers due to current distributions under steady state and contact fingers with smaller contact forces are seriously ablated by large short currents under short circuit conditions, and are the main contact degradation mechanism of plug-in connector. Conductor electromagnetic forces under single phase short circuit condition are larger than those of two phase and three phase short circuit conditions and the electromagnetic force peak moments under different fault conditions are not the same.
ISSN:1054-4887
1943-5711