双隔离断口GIS功能模块仿真计算及试验验证

可实现GIS不停电扩建和耐压功能的双断口隔离开关(DDS)采用非标准结构的断口型式,为了验证这种特殊结构是否满足实际运行工况,文中通过Ansys有限元软件,建立双断口隔离开关机、电、热3D仿真模型,开展双断口隔离开关机械强度、绝缘强度、载流能力的仿真计算,并以双断口隔离开关真型样机开展绝缘试验、温升试验、动热稳定试验、机械寿命试验、高低温试验、母线转移电流试验、壳体水压试验。研究结果表明:壳体最大主应力为235.08 MPa,盖板最大等效应力为114.86 MPa,均小于许用应力;双断口隔离开关各部件场强均低于允许场强,并有一定裕度;滑动连接部分最大温升为56.5 K,壳体温升为17.3 K,内部导体和壳体温升均满足要求;试验结果验证了仿真计算的正确性。双断口隔离开关已应用于±800 kV东方换流站220 kV GIS的6个备用扩建间隔,设备运行良好。

Simulation Calculation and Test Verification of GIS Functional Module with Double-break Disconnector

The double-fracture disconnect switch(DDS)is a solution to continue operating without shutting down during GIS extension and withstand tests,which is designed as an nonstandard structure.In order to verify that the DDS satisfies the actual operating conditions.In this paper,the 3 D simulation models of DDS for the mechanical,electrical,thermal field are established by Ansys.The simulation calculation of mechanical strength,insulation strength and current-carrying capability of the DDS are carried out.In addition,the insulation test,temperature-rise test,dynamical thermal stability test,mechanical life test,high and low temperature test,busbar transfer current test,shell water pressure test are carried on the real DDS as well.The results show that the maximum stress of the shell is235.08 MPa,and the maximum stress of cover plate is 114.86 MPa,which are both less than the allowable stress.It also show that the electrical field of each component in the DDS is lower than the allowable field strength.As for the temperature test,the maximum temperature rise of sliding joint and the shell are 56.5 K and 17.3 K.Temperature rise of both internal conductor and shell meet the requirements.In sum,the experimental results consistent with the simulation calculation.The DDS has been applied to 6 standby expansion intervals of 220 kV GIS in the±800 kV Dong-Fang converter station.