252kV GIS变电站外壳环流特性分析及有限元计算方法

Characteristic Analysis and Finite Element Calculation Method for Shell Circulating Current of 252kV GIS Substation

GIS在投入运行时外壳产生的环流会引起设备发热,加剧设备绝缘老化,损坏测量保护设备,降低供电可靠性,因此具有重要的研究意义。文中以某252 kV GIS变电站为研究对象,首先,文中详细地分析了GIS变电站内的设备结构,提出了一种GIS断路器外壳的环流模型;其次,文中提出了基于场—路耦合的GIS断路器外壳环流的有限元计算方法,并与电磁暂态仿真软件EMTP的计算结果进行了对比,验证了所提计算方法的准确性;最后,文中搭建了252 kV GIS变电站级仿真模型,计算在多种工况下GIS变电站外壳感应电压和环流分布情况,对实际变电站的环流计算和接地校核具有一定的指导意义。

When GIS is put into operation,the shell circulating current will cause heating,aggravate insulation aging,damage the measurement and protection equipment and reduce power supply reliability.Therefore,it has important research significance.In this paper,a 252 kV GIS substation is taken as the research object.Firstly,the equipment structure in the GIS substation is analyzed in detail,and a shell circulating current model of GIS circuit breaker is proposed.Secondly,the finite element calculation method of GIS circuit breaker shell circulating current based on field circuit coupling is proposed.The calculated results are compared with the electromagnetic transient simulation software EMTP,which verifies the accuracy of the proposed method.Finally,a 252 kV GIS substation-level simulation model is built to calculate the induced voltage and shell circulation current of GIS under various working conditions,which has certain guiding significance for shell circulation current calculation and grounding check of actual substation.