摘要：通过运用 Magnet和 ANSYS Fluent仿真软件对 SCSFB11-7400/35风电干式双分裂变压器在半穿越状态下的漏磁场分布、绕组负载损耗和温度场进行仿真和优化，同时通过温升试验验证仿真结果的准确性，最终确定绕组最热点的位置和大小。研究的前提条件主要包括变压器的型号和参数、运行模式、最热点限制、换热器功率、冷却液温和冷却风量要求等方面。研究发现，双分裂变压器在半穿越状态下的最热点温度在低压下绕组的上部、辐向绕组厚度约2/3（由内往外）处，以及可以适当调整低压导电箔材厚度或/和低压绕组的匝数分布来解决半穿越状态下低压绕组电流分配不均所造成的损耗集中问题，从而改善低压绕组内部最热点温度，满足变压器可靠和安全运行的要求。为风电干式双分裂变压器的最热点确定提供了研究方法和途径，也可以为风电干式双分裂变压器的深入研究应用和现场运行维护提供了依据和指导。

关键词：海上风电;双分裂变压器;半穿越绕组热点;温度场仿真

中圖分类号：TM41文献标志码：A文章编号：1009-9492（2021）11-0247-04

Research and Optimization of Winding Hot Spots of Wind Power Dual SplitTransformer under Semi-traversing Condition

Zhou Qifeng

（Siemens Transformer（Guangzhou） Co.， Ltd.， Guangzhou 510530， China）

Abstract： Magnet and ANSYS Fluent simulation software were used to simulate and optimize the distribution of magnetic leakage field， winding load loss and temperature field of SCSFB11-7400/35 dry type dualsplit transformer for wind powerunder semi-penetrating working condition. Meanwhile， temperature rise test was used to verify the accuracy of simulation results and finally determine the position and value of hottest point of winding. The preconditions of the research mainly include transformer type and parameters， operation mode， maximum temperature limit， heat exchanger power， cooling water temperature and cooling air volume requirements， etc. The hottest point in the windings of double split transformer under semi-penetration working condition was positioned at around 2/3 thickness （from inside to outside in radial direction） of the upper low voltage winding according to the research， and adjusting conductive foil thickness and/or turns distribution of low voltage winding was verified to solve the uneven distribution of the loss of half through the condition of low voltage winding current uneven distribution of the loss concentration problem， thus the hot spot temperature inside the low-voltage windings could be improved to meet the design requirements. The research results provide a research method and approach for determining the hot spot of dualsplit transformers for wind power， and provide a basis and guidance for in-depth research， application and field operation and maintenance of dualsplit transformers for wind power.

Key words： offshore wind power; dual split transformer; semi-penetrating winding hot spot; temperature field simulation

0 引言

风电双分裂干式变压器 SCSFB11-7400/35普遍应用在国内某6 MVA海上风力发电平台上，发电机转子经两路变频器与该型双分裂变压器的两个低压绕组连接，构成并联电气回路，然后通过高压绕组实现升压和传输电能到电网中。由于双分裂变压器的特殊结构，一旦其中一路变频器连接的一个低压绕组发生短路时，半穿越运行时的阻抗约是正常运行时全穿越阻抗的2倍，分裂电抗约是全穿越电抗的4倍，可以有效地限制短路电流。……