中压真空开关同步轴在接通过程中的静态和动态过程计算

Yevgen Bajda, Mykhailo Panteliat, Artem Kuzmin
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引用次数: 0

摘要

现代电气设备、中压开关和接触器理论研究的一个重要方向是研究其运行过程中发生的机械过程。首先,这是由于在接通过程中,有足够大的力和加速度作用在此类设备的结构元件和同步轴上。文章以建立的数学模型为基础,对真空开关同步轴在绝对刚性和实际轴的静态和动态模式下的机械过程进行了计算,并进行了比较分析。计算机建模的结果以表格和图形的形式呈现,其中包括轴的静态和动态变形数据,以及轴支撑的机械力。结果表明,轴的机械变形会导致接触压降和接触压力下降,但在正确选择同步轴横截面的情况下,这些数值对开关本身的运行影响不大(分别下降约 20% 和 7%)。计算结果还表明,与简化计算结果相比,由于轴的弯曲,支座中会出现额外的轴向力,这对根据等效静载荷选择轴承有很大影响。考虑到接触件和接触杆的质量,计算得出的动载荷是静载荷的 1.3 倍,这也是选择同步轴轴承时必须考虑的因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calculations of static and dynamic processes in the synchronizing shaft of a medium-voltage vacuum switch during the turn-on process
An important direction of theoretical research of modern electrical devices, medium voltage switches and contactors is the study of mechanical processes that occur during their operation. First of all, this is due to sufficiently large forces and accelerations acting on the structural elements and the synchronizing shaft of such devices in the process of switching on. In the article, on the basis of developed mathematical models, calculations of mechanical processes in the synchronizing shaft of a vacuum switch in static and dynamic mode for an absolutely rigid and real shaft are performed and their comparative analysis is carried out. The results of computer modeling are obtained in tabular and graphical forms, which include data on static and dynamic deformations of the shaft, as well as mechanical forces in its supports. It is shown that the mechanical deformation of the shaft causes a decrease in contact drop and contact pressure forces, but with a correctly selected cross-section of the synchronizing shaft, these values slightly affect the operation of the switch itself (the decrease is about 20% and 7%, respectively). It is also shown that as a result of the bending of the shaft, additional axial forces appear in the supports compared to the simplified calculation, which significantly affect the choice of bearings according to the equivalent static load. The calculated dynamic forces, taking into account the masses of contacts and contact rods, exceed similar static forces by 1.3 times, which must also be taken into account when choosing bearings in which the synchronizing shaft is held.
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