螺头水道是宁波-舟山港南部港域的深水进港航道,水深在40m以上,可通航各种吨位船舶。随着舟山经济发展,需建设与大陆的电力联网工程,并推荐跨越螺头水道的架空方案,而架空线路通航净空高度直接关系到进出港口船舶的安全畅通及今后港口发展。本文通过对今后大型船舶发展趋势的预测,分析船舶空载水线以上高度,以此确定220KV架空输电线路的通航净高要求。 The headwater channel is a deep-water inlet channel in the port area of ​​Ningbo-Zhoushan Port, with a water depth of more than 40m and is capable of navigating various tonnage vessels. With the economic development in Zhoushan, it is necessary to build an electric power interconnection project with the mainland and recommend overhead solutions across the screw head waterway. However, the head-on clearance height of overhead lines is directly related to the safe and smooth flow of inbound and outbound ports and future port development. Based on the forecast of the development trend of large ships in the future, the paper analyzes the height above the no-load waterline of the ship to determine the navigable clearance of 220KV overhead transmission lines.