内部故障电弧下GIS母线壳体的分析及设计

为验证GIS母线壳体在发生内部故障电弧时,壳体烧穿或短路电流被开断而不会发生爆炸,笔者依据经验公式完成了GIS母线筒的结构设计,并通过ANSYS结构模块对母线筒的强度进行了计算验证,同时通过2.8 MPa水压试验完成了对母线筒强度的校核,验证了设计和理论计算分析的可靠性。另外,考虑到母线筒内电弧的运动效应,由此引起的壳体烧穿时间加长,计算分析了此种情况下GIS母线耐内部故障电弧的能力。分析的结果表明,设计的母线壳体能够满足标准要求。

Design and Analysis of GIS Bus Enclosure Considering Internal Arcing

To ensure that an SF6 GIS bus enclosure does not explode as it has been burnt out or the short-circuit current has been cut-off during internal arcing,a construction design of SF6 GIS bus enclosure was completed according to an empirical formula,and the mechanical strength of the enclosure was computed based on the structural module in the software ANSYS.Moreover,the strength of the enclosure was verified through 2.8 MPa hydraulic pressure test to demonstrate the validity of the design.In addition,Considering the extending burnt-out time of the enclosure due to moving effect of arc in the metal enclosure,the capability of the GIS bus to withstand internal arc was evaluated in this condition.Result reveals that the designed SF6 GIS bus enclosure can meet the standards.