Experimental analysis on influence of temperature and bolted torque to DC contact resistance of terminal connector in UHV valve hall

The overheating problems of terminal connectors severely threaten the operation of ultra-high voltage projects and cause enormous losses of economy, so a higher currentcarrying reliability of the connectors has an important engineering significance with the development of transmission capacity. In t...

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Bibliographic Details
Published in:CSEE Journal of Power and Energy Systems 2020-12, Vol.6 (4), p.858-866
Main Authors: Jiajun Si, Xiaoming Rui, Jingchao Wang, Bin Liu, Shengchun Liu
Format: Article
Language:English
Subjects:
Aluminum
Bivariate analysis
Connectors
Contact resistance
Copper
Empirical analysis
Mathematical analysis
Mathematical models
Metal plates
Overheating
Reliability engineering
Tightening
Torque
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Summary:The overheating problems of terminal connectors severely threaten the operation of ultra-high voltage projects and cause enormous losses of economy, so a higher currentcarrying reliability of the connectors has an important engineering significance with the development of transmission capacity. In this paper, a bivariate mathematical model of contact resistance as functions of temperature and tightening torque was deduced based on the large current temperature rise tests. To perform such analysis, four typical terminal connectors, namely: overlapping terminal of aluminum plates, overlapping terminal of copper plates, overlapping terminal of plates with clad layer and overlapping terminal of copper rod with aluminum clamp, were chosen for the experiments. The changing rules of DC resistance with different tightening torques and different currents were studied. Then the empirical formula of contact resistance was deduced. Finally, temperature calculations of different terminal connectors were realized to verify the effectiveness of the bivariate mathematical model.
ISSN:2096-0042
2096-0042
DOI:10.17775/CSEEJPES.2019.00700