V/X接线牵引变压器的温升特性

Temperature Rise Characteristics of V/X Wiring Traction Transformer

针对V/X接线牵引变压器独特的接线方式、电气特性和负载特性,基于热电类比原理和变压器内部热传递过程建立V/X接线牵引变压器内部热路模型。参照电路理论推导温升计算微分方程,并根据热特征参量间的相互关系,建立V/X接线牵引变压器内部温升计算模型。以1台机车从驶入到驶出某V/X接线牵引变压器供电区间的过程为例,仿真计算顶层油温度曲线和绕组热点温度曲线。分析绕组绝缘寿命的影响因素,并根据牵引负荷的特点,提出适用于V/X接线牵引变压器的绝缘寿命损失计算方法。

According to the unique connection mode, electrical characteristics and load characteristics, the internal thermal circuit of V/X wiring traction transformer was established based on the thermoelectricity analogy principle and the thermal transfer process in transformer. Referring to the circuit theory, the dif- ferential equation for calculating temperature rise was deduced. According to the relationships among the thermal characteristic parameters, the calculation model was constructed for the internal temperature rise of V/X wiring traction transformer. The process of an electric locomotive running in and out the power supply section of a V/X wiring traction transformer was taken for example, the temperature curves of the top layer oil and the winding hot-spot were simulated. Through analyzing the influencing factors of wind- ing insulation life and based on the characteristics of traction load, a calculation method for insulation life loss applicable to V/X wiring traction transformer was proposed.