High Current Temperature-Rise Test and Simulation Calculation of Valve Hall Fittings

doi:10.3969/j.issn.1000-7229.2015.09.003

Abstract

Abstract:

The improvement of DC transmission capacity proposes a higher request on the discharge current capacity, current-carrying reliability and heat resistance of valve hall fittings. In DC transmission project, valve hall fittings undertake the function of power equipments electrical connection, mechanical fixation and shielding. As the fittings operate with large current, high working voltage and poor heat dissipation, it is essential to study the reliability of existing fitting after capacity enhanced. Taking two typical valve hall fittings as research objects, equivalent cylinder was modeled as equivalent contact resistance, and thermal-electric coupled field was used for the finite element simulation. The temperature-rise test with high current was also carried out on the fittings, and the unbalanced current distribution of aluminium strip and stranded wire was surveyed and analyzed with using infrared thermal imager, as well as the local overheating phenomenon at the connection of welding and bolt. The test results and simulation analysis show that the local overheating and uneven current distribution of the fittings exist under 5620A excitation current. The simulation result agrees with temperature-rise test.

Key words: capacity enhanced, valve hall fittings, temperature-rise test, thermal-electric coupled field

CLC Number:

TM 721

WU Hao, PENG Zongren, YANG Yuan, WANG Jialong. High Current Temperature-Rise Test and Simulation Calculation of Valve Hall Fittings[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(9): 16-21.

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