考虑高速铁路负荷特性的牵引变压器可靠性评估

发布时间：2018-10-14 13:50

【摘要】：牵引变压器的可靠性评估对整个高速铁路牵引供电系统的可靠性研究至关重要。本文分析高速铁路牵引负荷特性对牵引变压器可靠性的影响,提出一种牵引变压器可靠性评估方法。该方法同时考虑高速铁路牵引负荷不平衡性、冲击性和非线性特点,利用IEEE C57.110标准提供的谐波损耗因子计算谐波引起的变压器降容率,通过热路模型及其微分方程组将高速铁路牵引负荷特性综合量化到变压器温升计算中。在此基础上,通过Arrhenius-Weibull模型求取变压器失效概率。以世界首台220kV等级的中点抽出式Scott牵引变压器为例,利用实测数据验证该方法的可行性,计算得到牵引变压器的可靠性指标,并分析高速铁路负荷特性对其可靠性的影响。结果表明高速铁路负荷对牵引变压器可靠性的影响不容忽视。评估结果可辅助合理决策,以降低牵引变压器运行风险,满足安全可靠需求。
[Abstract]:The reliability evaluation of traction transformer is very important to the study of the reliability of traction power supply system in high speed railway. This paper analyzes the influence of traction load characteristics on traction transformer reliability in high-speed railway, and puts forward a reliability evaluation method for traction transformer. Considering the unbalanced, impact and nonlinear characteristics of traction load in high-speed railway, the harmonic loss factor provided by IEEE C57.110 is used to calculate the transformer capacity reduction rate caused by harmonics. The traction load characteristics of high-speed railway are comprehensively quantified in the calculation of transformer temperature rise by means of the heat path model and its differential equations. On this basis, the failure probability of transformer is calculated by Arrhenius-Weibull model. Taking the world's first 220kV class midpoint pull-out Scott traction transformer as an example, the feasibility of the method is verified by the measured data, the reliability index of the traction transformer is calculated, and the influence of the load characteristics of high-speed railway on its reliability is analyzed. The results show that the influence of high speed railway load on traction transformer reliability can not be ignored. The evaluation results can be used to reduce the operational risk of traction transformer and to meet the need of safety and reliability.
【作者单位】：西南交通大学电气工程学院;四川电力设计咨询有限责任公司;
【基金】：中国铁路总公司科技研究开发计划(2014J009-A,2016J010-A) 珠海市轨道交通健康运营协同创新中心(55560707)
【分类号】：U224.22

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