适用于AT供电系统的二次侧中点抽出式Scott接线牵引变压器

The Scott Tracion Transformer With Secondary Midpoint Drawn-Out Applicable to AT Feeding Systems

分析了可用于电气化铁道AT供电系统的二次侧中点抽出式Scott接线变压器电气特性和阻抗取值问题。在对AT供电系统不同接线形式变压器进行技术性能比较的基础上,提出了我国高速客运专线牵引变压器的选型建议。试制了一台50kVA的二次侧中点抽出式Scott接线变压器模型,实际测试结果证明了技术方案的可行性和相关数学模型的正确性。二次侧中点抽出式Scott接线变压器具有抑制负序能力强、能省掉变电所内AT、简化变电所主接线、减小变电所占地面积等优点,具有实际应用价值。

The electrical characteristic and impedance selection problem of the Scott transformer with secondary midpoint drawn-out that can be used in electric railway AT power supply system are analyzed.Based on the comparison of the performance of different transformers applicable to AT system,a proposal on the main transformer selection of high speed passenger dedicated lines is presented.A 50kVA experimental model of the Scott transformer has been manufactured to validate its feasibility to AT system and related mathematic model.The Scott transformer with secondary midpoint drawn-out has the merits of restraining the negative phase sequence current,omitting the AT inside substation,simplifying the connection and decreasing the space occupation of substation and is valuable for practical applications.