电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系)，北京市 海淀区 100084

从走廊宽度、电磁环境、潜供电流和防雷特性4个方面对750 kV同塔同窗同相序紧凑型输电方式进行了分析，发现与单回紧凑型、同塔双回T型紧凑型及同塔双回常规型输电方式相比，采用同塔同窗同相序紧凑型输电方式所需的走廊较小，无线电干扰和可听噪声相对较低，尤其是电晕损失明显减小，采用这种方式在一定条件下可获得较好的经济效益与社会效益。对该输电方式的潜供电流和防雷特性的分析结果表明，在短距离内采用这种输电方式不会对系统安全运行造成明显的不利影响，但这种输电技术也可能存在可靠性低的问题，其带电作业方式及塔头放电特性仍有待研究。

750 kV输电线路   同塔同窗同相序紧凑型   走廊   电晕损失   电磁环境   潜供电流

The compact transmission mode of two 750kV transmission circiuts with same phase sequence arranged in the same tower window is analyzed in four aspects, i.e., the corridor width, electromagnetic environment, secondary arc current and lightning protection charateristic. It is found that comparing with compact single circuit transmission mode, T-type compact transmission mode of two circuits on the same tower and conventional transmission mode of two circuits on the same tower, the transmission mode of two circuits with same phase sequence in the same tower window need narrower corridror width, and the radio interference and audible noise caused by this transmisison mode is relatively lower, especially, the corona loss is reduced evidently, thus better economic and social effects can be obtianed by applying this transmission mode in a short distance under a centain condition. Results of analysis on secondary arc current and lightning protecition characteristics of such a transmission mode show that application of this transmission mode in a short distance will not bring about evident adverse effect on secure operation of power grid, however, there may exist low reliability of this transmission mode, and the live working and flashover characteristics of tower head for this transmission mode should be further researched.

750kV transmission lines   compact transmission mode with same phase sequence in the same tower window   corridor   corona-loss   electromagnetic environment   secondary arc current