跨海大桥高压随桥电缆接地方案设计

Design of High-voltage Cable Grounding Scheme for Sea Crossing Bridge

为满足舟山绿色石化基地最新负荷需求并提高供电安全性,结合远景岱山县岱北变落点的规划,考虑构建以舟山变为中心的北部环网结构,需建设舟山-鱼东2回220 kV输电线路。目前,输电线路在海域的走线主要以海上架空线和海底电缆为主,可是这两种方案都存在令人难以接受的缺点,因此舟山-鱼东2回220 kV电缆采取随桥敷设的方式。舟岱大桥全长16.35 km,为满足电缆长距离跨桥敷设的要求,从电缆敷设位置、电缆及附件的选型、电缆防伸缩、电缆防振措施、电缆的接地设计等方面对长距离跨桥电缆的敷设方案进行设计。

In order to meet the latest load demand of Zhoushan green petrochemical base and improve the power supply safety,combined with the long-term planning of the landing point of Daibei transformer substation in Daishan County,it is considered to build the northern ring network structure centered on Zhoushan transformer substation,and it is necessary to build Zhoushan-Yudong two circuit 220 kV transmission line.At present,the transmission lines in the sea area is mainly offshore overhead lines and submarine cables,but these two schemes have unacceptable shortcomings.Therefore,Zhoushan-Yudong two circuit 220 kV cable are laid along the bridge.The total length of Zhoudai bridge is 16.35 km.In order to meet the requirements of long-distance bridge laying,the laying scheme of long-distance bridge cable is designed from the aspects of cable laying position,selection of cables and accessories,cable anti expansion,cable anti vibration measures,cable grounding design etc.