摘要
在1 000 kV特高压交流GIL样机的温升试验中,用于补偿热胀冷缩形变的伸缩节的温度显著高于管道的其他位置。为研究GIL伸缩节不同部位的损耗分布特性,以复式拉杆型伸缩节为例,建立了三维有限元仿真计算模型,考虑最严酷情况（运行电流100%通过管道壳体回流）,分析波纹管材料磁导率、中心导体尺寸和运行电流值对伸缩节损耗的影响。研究表明,回流的电流流经波纹管（约占总电流的3.19%）是引发波纹管壳体损耗发热的主要原因;加工造成的部分波纹管磁导率增大将会增大波纹管壳体的损耗;增大中心导体外径显著降低了中心导体本身的损耗,对伸缩节其他部位的损耗影响不大;改变运行电流值可以改变伸缩节的总体损耗,但并不改变伸缩节各部分损耗的占比。为进一步降低波纹管处的损耗,提出了单侧增加半导电层或绝缘层用于限制电流的措施,既显著降低了损耗又消除了悬浮电位带来的安全隐患。
In the temperature rise test of 1 000 kV UHV AC GIL prototype, the temperature of an expansion joint used to compensate the expansion deformation due to thermal expansion and cold contraction is significantly higher than that of other parts of a pipeline. In order to study the characteristics of loss distribution in different parts of the GIL expansion joint, a three-dimensional finite element simulation model was established based on the GIL compound pull rod type expansion joint. Considering the harshest condition（operating current returns 100% through the pipe shell）, the influences of the permeability of bellows materials, the size of the central conductor and operating current value on expansion joint loss were analyzed. Results show that the return current flowing through the bellows（about 3.19% of the total current） is the main reason for the loss of the bellows. The increase of permeability of some bellows caused by manufacturing will increase the loss of bellows shell. Increasing the outer diameter of the center conductor will significantly reduce the loss of the conductor itself, but has little effect on the loss of other parts of the expansion joint. Changing the operating current value can change the overall loss, however does not change the proportion of the loss of each part of the expansion joint. In order to further reduce the loss of the bellows, the measures of limiting the current by unilaterally adding half-conductive layer or insulating layer are put forward, which not only reduces the loss significantly, but also eliminates the potential safety potential of the suspension potential.
作者
刘丽岚
田汇冬
吴泽华
张鹏飞
周建华
彭宗仁
LILT Lilan;TIAN Huidong;WU Zehua;ZHANG Pengfei;ZHOU Jianhua;PENG Zongren(State Key Laboratory of Electrical Insulation and Power Equipment,Xi＇an Jiaotong University,Xi＇an 710049,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第10期3183-3189,共7页
High Voltage Engineering
基金
国家自然科学基金(51521065)
国家电网公司科技项目(SGJSDK00KJJS1600321)~~
关键词
特高压GIL
伸缩节
有限元仿真
损耗分析
结构改进方案
UHV GIL
expansion joint
finite element simulation
loss analysis
structure improvement measure
