±1100kV换流站户内直流场巡检方案研究

Research on Inspection Scheme of Indoor DC Field for ±1 100kV Converter Station

摘要:

± 1 100 kV 是特高压直流输电工程中的全新电压等级，伴随电压等级的提升，系统过电压水平也相应有了显著的提高，空气净距大幅增加。出于对运检人员人身安全的考虑，1 100 kV 带电设备对人的安全净距应按照理论放电概率为0 的距离校核，即33 m。如果考虑户内直流场允许运检人员进入，则会极大地增加建筑物的尺寸，造价高昂，同时由于巨大的空气净距要求使得运检人员无法靠近带电设备。为了解决这一矛盾，提出了一种双层屏蔽的护笼并阐述了其设计方案，基于这种护笼继而提出了地面巡视走道、地面巡视小车等两种巡检方案，通过这些方案，使得运行人员的安全要求得以满足，同时大幅节省了± 1 100 kV 户内直流场的建造费用。

Abstract:

± 1 100 kV is a new voltage level for HVDC transmission projects． Along with the rising of voltage level，overvoltage level is increased significantly，which brings a sharp rise of air clearance． For the sake of the operators' safety，the air clearance between the electrode and human body should be guaranteed to be 0 according to the theoretical discharge probability， that is，33m． Therefore，if operators are admitted to enter the indoor DC field，a tremendous dimension is required for the building，which brings huge cost，and meanwhile，it is not convenient to observe the equipment from far away． In order to solve this problem，a double layer shielding cage is proposed，and its design structure is illustrated． Based on this cage，two inspection schemes are proposed，namely the aisle scheme and rail car scheme． The application of these schemes satisfies the work requirements of the operators and spares the cost of the construction．