摘要
为在电气化铁道牵引供电系统中推广应用YNvd(星形-开闭三角形)接线变压器,基于磁势平衡方程、绕组接线方程、输出端口方程和电压传递方程,建立了YNvd接线变压器的数学模型,讨论了达到变压器良好的平衡特性应满足的设计条件;对电力系统阻抗进行了折算,给出了牵引变压器二次侧端口的电压输出方程和两相等值电路.研究表明,绕组阻抗不匹配将导致变压器在不同接地运行方式下产生零序电流和零序电压;牵引母线短路电流由系统阻抗、变压器漏抗及阻抗匹配程度决定.
In order to further apply YNvd-connected transformer,a new three-phase three-winding balance transformer,in the traction power system of electrified railway,a strict mathematical model for the transformer was set up based on the magnetomotive force balance equations,the winding connection equations,the output-port equations and the voltage transfer equations,and the design requirement for ideal balance performance of the transformer was discussed.In addition,power system impedance was converted,and output voltage equations and two-phase equivalent circuit were given.The research results show that impedance mismatch will result in zero-sequence current and zero-sequence voltage in different grounding modes of a YNvd-connected transformer,and that short-circuit current for traction substation is determined by the power system impedance,leakage impedance and impedance matching.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2010年第4期555-560,共6页
Journal of Southwest Jiaotong University
基金
国家科技支撑计划资助项目(2007BAA12B05)
铁道部科技研究开发计划重大课题(Z2006-047)
铁道部科技研究开发计划重点课题(2007J035)
关键词
平衡变压器
阻抗匹配
短路电流计算
电气化铁道
balance transformer
impedance matching
short-circuit current calculation
electrified railway
