110kV直流电缆连接盒耦合场分析  

Analysis on coupling fields of steady-state condition for DC 110 kV cable joint

作　　者：郑殿春[1] 高海强[1] 李智[1] 陈春天[1] 赵大伟[1] 杨嘉祥[1] 

机构地区：[1]哈尔滨理工大学工程电介质及其应用技术教育部重点实验室,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2013年第12期64-69,共6页Electric Machines and Control

基　　金：黑龙江省教育厅科学技术研究项目(12511z008)

摘　　要：根据空间电荷效应以及介质电导率的温度影响,采用直流下导电介质电流连续性方程和泊松方程对直流电缆连接盒的耦合场进行分析。获得了110 kV直流电缆连接盒绝缘介质中电流场、温度场、空间电荷场以及电导率的变化规律,并给出了空载和负载下绝缘结构电场分布。结果表明负载下,电缆绝缘介质的电导率较空载下增大2个数量级,电场最大值由线芯表面转移到了绝缘介质外表面;直流电场下与交流相比接线盒应力堆表面切向电场增加一倍且最大值出现在应力堆中部。所以在设计直流电缆连接盒时,不仅要保证在空载时线芯表面电场强度不超过其允许值,而且还应保证接线盒在容许最大负载时,绝缘层外表面处的电场强度和应力堆表面的切向电场强度也不能超过其允许值。Based on space-charge effect and the temperature influence of medium conductivity, DC （ di- rect current） cable joint coupling field was analyzed by current continuity equations and coupled with the Poisson＇ s equation. The change law of current field, temperature field, space-charge field and conduc- tivity were gotten in 110 kV DC cable joint, and electric field distributions were revealed under loaded and no loaded conditions. Results indicate that conductivity under load is two orders of magnitude higher than that under no-load ; the place of peak electric field transfers from core surface to the insulation sur- face; the peak tangential electric field of stress surface in DC appears on central section and is twice as that in AC （alternating current）. So when designing the cable joint, the no-load core surface electric field need to be under the allowable value and the electric field of insulation surface and the tangential e- lectric field of stress surface also need to be under the allowable value on maximum load.

关 键 词：HVDC电缆连接盒 电场 温度场 空间电荷 

分 类 号：TM247[一般工业技术—材料科学与工程]