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摘要
HVDC cable load cycle system is a key equipment for the research of the insulation properties in full?size cable，and its chief function is to control both the conductor temperature and the temperature gradient across the in sulation precisely. Aiming to study the influence of the flow rate of the temperature?control medium on the conductor temperature and the temperature gradient across the insulation in the ±500 kV HVDC cable load cycle system，a fi nite element model of the water cycle channel was established in COMSOL Multiphysics，and the thermo?fluid?solid coupling simulations of the HVDC cable，circulating water，and thermal insulation pipe were carried out. The axial differences of the conductor temperature and temperature gradient across the insulation were studied by controlling the flow rate of the water，and the water temperature and the current were also corrected. The results showed that the water’s temperature fluctuation reduced with the increasing of its flow rate，and when the latter was 0.3 m/s，the axi al differences of both the conductor temperature and temperature gradient were less than 1 ℃. The iterative calcula tion method of the water temperature and current magnitude was proposed，which could limit the errors of the conduc tor temperature and temperature gradient within ±1 ℃ to meet the demand of the temperature control in the cable load cycle system. ?2020, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.
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