摘要
车载牵引变压器是动车组单体最重的电气设备,其轻量化有助于动车组节能降耗与运输效率提升。现有车载牵引变压器均为油浸式,干式变压器是其轻量化的主要方案,但目前干式变压器采用的环氧树脂绝缘易开裂、散热无法满足要求。为此,以具有良好力学性能的硅橡胶为基体材料,首先通过温升分析研究绝缘材料热导率需求,然后制备样品开展实验,以电学性能和力学性能为约束条件研究绝缘材料导热性能改进方法,进而研究车载牵引变压器轻量化设计方法,最后依据研制的绝缘材料与轻量化设计方法,设计并研制了一台容量为250 kVA的小型轻量化车载牵引变压器样机。结果表明:制备的高导热硅橡胶复合绝缘材料性能满足干式车载变压器对绝缘和力学性能的要求;研制的小型变压器样机质量为780 kg,相比同容量油浸式车载牵引变压器质量减少了46.2%,经试验测试得在额定条件下样机的热点温度值为167.68℃,满足车载牵引变压器运行需求。
The weight reduction of the on-board traction transformer,the heaviest electrical equipment of the EMU,helps the EMU save energy and improve transportation efficiency.As existing on-board traction transformers are all oil-immersed,dry-type transformers are the main solution for lightweighting them.However,dry-type transformers cannot meet heat dissipation requirements due to likely cracking epoxy resin insulation used.To this end,using silicone rubber with good mechanical properties as the base material,this paper first studied the thermal conductivity requirements of the insulating material through temperature rise analysis.Then experiments were carried out after sample preparation.With electrical and mechanical properties as constraints,a method was studied for improving the thermal conductivity of insulating materials,while a lightweight design method for the on-board traction transformer was studied.Finally,based on the developed insulation materials and lightweight design methods,a small lightweight on-board traction transformer prototype with a capacity of 250 kVA was designed and developed.The results show that the properties of the prepared high thermal conductive silicone rubber composite insulation material meet the requirements of insulation and mechanical properties of dry-type on-board transformers.The weight of the developed small transformer prototype is 780 kg,46.2%lighter than the oil-immersed on-board traction transformer of the same capacity.According to experimental testing,the hot spot temperature value of the prototype under rated conditions is 167.68℃,which meets the operation requirements of the on-board traction transformer.
作者
周利军
夏颖怡
王东阳
李沃阳
袁帅
蔡丰林
ZHOU Lijun;XIA Yingyi;WANG Dongyang;LI Woyang;YUAN Shuai;CAI Fenglin(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第4期29-37,共9页
Journal of the China Railway Society
基金
国家自然科学基金(U1834203)。
关键词
动车组
车载牵引变压器
轻量化
硅橡胶绝缘
热导率
EMU
on-board traction transformer
lightweight
silicone rubber insulation
thermal conductivity
