Temperature‐dependent electric field distribution in±800 kV valve‐side bushing insulation for a converter transformer
作者机构：School of Electrical and Information EngineeringTianjin UniversityTianjinChina State Key Laboratory of Advanced Power Transmission TechnologyState Grid Global Energy Interconnection Research InstituteBeijingChina
出 版 物：《High Voltage》 (高电压（英文）)
年 卷 期：2021年第6卷第1期
页 面：106-115页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学]
基 金：National Natural Science Foundation of China,Grant/Award Number:51537008 National Natural Science Foundation of China,Grant/Award Number:51807136 National Natural Science Foundation of China,Grant/Award Number:51807137 National Postdoctoral Program for Innovative Talents,Grant/Award Number:BX201700168 National Natural Science Foundation of China,Grant/Award Number:U1966203
主 题：distribution insulation field
摘 要：The electric field distribution is determined for the design and long‐term performance of bushing yet gets complicated when coupled with temperature due to the highly tem-perature‐dependent conductivity of *** electrothermal coupling model is established based on a�800 kV converter transformer valve‐side *** measured temperature‐dependent conductivity of insulation is adopted and *** electric field distribution inside a condenser core under the influence of temperature was investigated,and the related mechanism was analysed,considering the different voltage forms,loading currents,and changeable ambient *** temperature gradient within the condenser core is verified,and the electric field migration is *** is indicated that the electric field strength shows a strong dependence on temperature and increases along the radial *** maximum field strength appears at the outmost shield layer under the operating voltage and the load current 4500 A,which is higher than that under the DC long‐term withstand voltage of 1455 kV without thermal *** increased load current,decreased oil temperature,and enhanced valve hall temperature will lead to more serious electric field distortion,and unacceptable dielectric stress may *** attention should be paid to the design and operation of bushing for DC applications.
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