牵引负荷对变压器绝缘老化和寿命损失的影响

在分析牵引负荷特点和变压器绝缘老化机理的基础上,提出了绕组热点温升与牵引变压器绝缘寿命损失之间的关系式。仿真研究了经典牵引负荷下的绕组热点温升,计算了绕组热点温升引起的绝缘寿命损失;依据仿真结果建立了牵引变压器受冲击负荷影响的模拟实验系统,通过监测、分析冲击负荷和等值负荷2种情况下油中溶解CO和CO2含量的变化情况,得到了热冲击对绝缘老化的影响关系。研究结果表明牵引冲击性负荷对变压器绝缘寿命损失影响很大,不容忽视。

Effect of Traction Loads on Insulation Aging and Loss-of-life of Transformers

Based on an analysis of the characteristics of traction loads and the mechanism of insulation aging, a new relationship equation between loss-of-life of insulation and temperature rises of the coiling hotspot (TRCH) is proposed. The TRCH under classical traction loads is simulated. With the new equation and the simulating results, the loss-of-life of the traction transformer due to TRCH is calculated. At the same time, an experimental system is designed to study the relationship between insulating aging and traction loads. The gases dissolved in oil (GDO) of an experimenting transformer such as CO and CO2 are monitored and analyzed. Thus the effect of the thermal impulse on insulation aging is studied by comparing the GDO of transformer under impulse loads and equivalent loads. Test results show that the traction loads seriously affect insulation aging and loss-of-life of the traction transformer, which should by no means be overlooked.