摘要：
随着我国经济社会的高速发展,许多地区城镇村庄密集,规划设施众多,线路走廊资源紧张.当常规的一条单回路与一条同塔双回路平行架设时,可采用同塔三回路,以缩小线路走廊、降低工程造价、减小对环境的影响.为合理选择500kV同塔三回交流输电线路的杆塔结构及导线布置,从相序排列、塔头布置、导线高度三方面对电磁环境进行分析,结果表明:相邻回路逆相序排列时工频电磁场小于同相序排列时,三回路均同相序排列时则最大,无线电干扰和可听噪声反之,工频电场是控制性因素,推荐相邻回路采用逆相序排列;门型塔的电磁环境指标较差且走廊宽度较大,猫型塔和酒杯型塔的电磁环境指标接近,推荐走廊宽度较小的猫型塔布置;无线电干扰随导线高度的增大呈先升后降的趋势,其它指标均随导线高度的增大而减少,选择相序排列工回ABC-Ⅱ回ABC-Ⅲ回CBA的猫型塔布置后,导线最小对地高度不受电磁环境的制约,按规范执行即可.%With the supercharged growth of economic society in China,there are some problems arose in many areas,such as,the towns and villages distributed densely,the numerous facilities are planning and the transmission line corridor resources are getting scarce.When a conventional one-tower-one-circuit line and a traditional one-tower-two-circuit line erected in parallel,one-tower-three-circuit transmission line could be used to narrow the line corridor,decrease the project cost and reduce the impact on the environment.In order to optimize the tower structure and conductor arrangement of 500 kV one-tower-three-circuit AC transmission line,we analyze the electromagnetic environment from the aspects of phase sequence,tower head arrangement and wire height,respectively.The results show that when inverse phase sequence arrangement in the adjacent loop,the frequency electromagnetic field was smaller than same phase sequence arrangement.If three loops are arranged in the same phase sequence,frequency electromagnetic field will be maximized.The law of radio interference (RI) and audible noise (AN) are opposite of frequency electromagnetic field.The frequency electric field is the controlling factor that is recommended to use the inverse phase sequence in adjacent loop.The quota of electromagnetic environment of portal tower indicate negative,moreover,the corridor width shows larger,the quota of electromagnetic environment of cat tower and cup-type tower are close,cat-tower is recommended because its smaller corridor width.The RI rose first and then decreased with the change of wire height;other indexes are decreased with the wire height going high;after we arranged the cat type tower with phase sequence of Ⅰ loop ABC-Ⅱ loop ABC-Ⅲ loop CBA,the wire minimum height is not restricted by the electromagnetic environment;it can be executed as long as follow the specification.
