湖北干式变压器：绕组短路轴向机械力的计算

绕组短路轴向机械力的计算 　　
湖北干式变压器在突然短路时，巨大的短路冲击电流将使湖北干式变压器绕组收到很大的电磁力，而且使线圈急剧发热。在较高的温度下，导线的机械强度较小，电磁力更容易使线圈破坏。为此，详细的分析作用力，并预先校核线圈的强度是很必要的。
电动力的产生是绕组中短路冲击电流与漏磁场互相作用的结果。电动力的计算是比较复杂的，这是因为：
湖北干式变压器绕组并不是单一物质的整体，在结构上，每一绕组由导线组成，这些导线被电缆纸和纸板组成的匝间和层间绝缘隔开，在线段间还有散热和绝缘的垫块。当短路时，电动力在线圈的线匝间不是均匀分布的。它们的合力作用在线圈时，线圈支撑绝缘上，垂直油道的撑条上以及绝缘纸筒上。
短路时的大电动力只延续非常短的时间，而且线匝和匝绝缘的弹性对合力有极重要的影响，为此合力要显著的减小。
线圈绝缘的弹性软化作用无法估计，因为绝缘的弹性很多因素决定，如线圈绕的松紧程度，线圈浸渍的程度及干燥后绝缘的压缩程度等。
目前对短路电动力的计算是把线圈作为一个整体，不考虑绝缘的内部弹性（变成额外的安全因数）。另外，计算湖北干式变压器的漏磁通时，决定导线的允许应力时都有很多的假定。可见线圈短路电动力的计算准确性是有一定问题的，但作为短路电动力的理论分析还是完全可行的，实用的。

Winding short circuit calculation of the axial mechanical force

Transformer in a sudden short-circuit, the huge impact of the short-circuit current transformer windings will receive a lot of electromagnetic force, and rapid heat coil. At higher temperatures, the mechanical strength of the wire is smaller地 址：山东聊城经济开发区华山路南首30号, easier to electromagnetic force of the coil destruction. To this end, a detailed analysis of the force and the strength of the pre-check of the coil it is necessary.
Electric power generation is the result of the interaction of the current and the leakage magnetic field winding short circuit impact. The calculation of the electric power is more complex, and this is because:
Transformer winding is not a single substance as a whole, on the structure, 邮 箱：1262980066@qq.comeach of the windings is composed by the wires, these wires are composed of turns of the cable paper and paperboard, and the interlayer insulating spaced, the line segment between the cooling and insulating pad. When short-circuited, the electric power between the coil turns is not uniformly distributed. The joint effect of the coil, the coil support insulation, vertical oil channel stays well insulated paper tube.
The short-circuited when the maximum electric power lasting only a very short time, and the elasticity of the winding turns and turn insulation have a very important effect on the force, for this force to be significantly reduced.
Elastic softening effect of the coil insulation can not be estimated, because the insulating elastic depends on many factors, such as the degree of tightness of the coil-winding, the degree of impregnation of the coil and the degree of compression of the dried insulating etc..
The calculation of the short-circuit electric power of the coil as a whole, do not consider the internal elasticity of the insulation (to become an additional factor of safety). In addition, the calculation of the leakage flux of the transformer, the decision conductor allowable stress has many assumptions. Visible coil short-circuit power calculation accuracy is a certain problem, but as a theory of the short-circuit power analysis is entirely feasible and practical.

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