800kV分体结构GIS母线外壳环流特性的研究

母线外壳环流影响系统的输送容量,损耗发热,加速绝缘部分老化。构建了三相分体结构GIS母线外壳环流仿真计算模型,确定了模型的参数,分析了分体式连续型GIS母线外壳中影响外壳环流大小的因素以及各种故障下的环流特性。试验结果表明,输送相同的容量时,可采用高电压、小电流的方式;考虑地理环境和制造成本的同时,应尽量缩短相间距离,增加母线外壳的架设高度,增大母线半径,增加接地数,采用感抗较高的连接体;计算内部故障时,GIS外壳应全线接地。

Characteristics of the Circulating Current on 800 kV Insolated Phase Bus Enclosure

The transmission capacity of power system is affected by the circulating current of bus enclosure which can also induce the heat generated by loss,and accelerate the insulation aging.In this paper,the model of circulating current with the three-phase sub-aspect bus in GIS is established,and the parameters of the model are determined.The effect factors of circulating current in successive type enclosure of that are analyzed.The characteristics of circulating current in the presence of failure are studied simultaneously.The results show that the high voltage and low current should be adopted when transmitting the same capacity.The short phase distance,high erecting height,large bus radius,more earthing point,and large inductive reactance connector should be adopted,considering the geographical environment and manufacturing cost.The enclosure of GIS should be grounded in whole line,when the internal fault is calculated.