延安干式变压器：短路阻抗概述

短路阻抗概述 　　
概述
短路阻抗是延安干式变压器的重要技术参数，绕组的阻抗决定于绕组的匝数和尺寸，因而也决定了延安干式变压器技术经济指标。
短路阻杭计算中将折算于某一侧的短路阻抗，乘以该侧的额定相电流，即为折算至该侧的短路阻抗，为计算时的方便.常以标么值表示短路阻扰。此时折算至高压侧的数值与低压侧数值应相同，这样以标么值表示短路阻抗在实际计算中得到了广泛应用。
在计算中，凡不按铁心所规定磁路流动的所有其它磁通均称为漏磁通。延安干式变压器的电抗是指延安干式变压器漏磁通与绕线匝交链度的标志。对于双绕组的延安干式变压器的漏磁通是由二次绕组的磁势和与其相平衡一次绕组磁势负载分载共同产生的，而在一、二次绕组中分别感应出漏抗电势。
漏磁通的磁阻主要决定于产生它的绕组所占据空间的几何尺寸，而该空间以外的磁路，由于漏磁通发散面积增大，或经过铁心及外壳铁磁介质的磁阻很小，因而漏磁通与产生它的漏磁势基本上是呈线形关系.翻磁通正比于漏磁势，反比于磁路的磁阻。同时产生磁通的磁势正比于负载电流和匝数.磁路的磁阻正比于磁路长度，反比于磁路截面积尺寸，
漏滋通在绕组所占据空间里流通的方向与绕组轴线方向平行，该磁通称为纵向漏磁通，相应的纵向漏磁通产生的电抗，称为纵向漏抗电势。
在同心式的一、二次绕组安匝沿轴向高度方向分布往往是不平衡的.因而在一、二次绕组所占据空间里还有一种流通方向与绕组轴线方向相垂直漏磁通.此漏磁通称为横向漏磁通.它在一、二次绕组中产生漏电抗，此电抗称为横向漏电抗。对于属于中小型延安干式变压器而言.此横向电抗在绕组总电杭中所占比例很小，一般在容量较大的具有单独调压绕组的有载调压延安干式变压器中才考虑横向电抗。
在传统的绕组电杭计算法中.有漏磁场能量法、漏磁链法和平均几荷距离法等。

Short-circuit impedance

Outline
Short-circuit impedance is an important technical parameters of the dry type power transformer winding impedance is determined by the winding number of turns and size, and thus determine the technical and economic indicators of dry-type power transformers.
Short-circuit impedance calculation will be converted to a particular side of the short-circuit impedance, multiplied by the side of the rated phase current, is converted to short-circuit impedance of the side, for computational convenience. Often in standard unit value short-circuit obstruction. At this time converted to the value of the high pressure side and low-voltage side of the value should be the same, so that in standard unit value short-circuit impedance has been widely used in practical calculations.
In the calculation, all other flux where not according to the core provisions of the magnetic circuit flow is called leakage flux. The dry type power transformer reactance transformer leakage flux and winding turns, cross-linking degree mark. For dual-winding dry type power transformer leakage flux is contai企业账号：1611 0032 092 00213 086ned by the secondary winding of the magnetic potential and magnetic potential and its phase equilibrium once winding load points generated in the primary and secondary windings, respectively, induced leakage reactance of the electric potential.
The reluctance of leakage flux is mainly determined by a winding geometry of the space occupied by the space outside the magnetic circuit, the leakage flux divergence area increases, or through the reluctance of the core and shell of ferromagnetic media , and thus the leakage flux and a leakage magnetic potential is basically a linear relationship. turn flux is proportional to the leakage magnetic potential, is inversely proportional to the magnetic circuit reluctance. Produce the flux of magnetic potential is proportional to the load current and turns the magnetic circuit reluctance is proportional to the magnetic path length, is inversely proportional to the magnetic circuit cross-sectional area sizes,
The direction of flow of leakage of HIV through the winding occupies space in parallel with the winding axis of the magnetic flux is called the vertical magnetic flux leakage, the corresponding longitudinal magnetic flux leakage reactance, known as vertical leakage reactance potential.
Concentric secondary winding ampere-turns along the axial height of the direction distribution is often uneven and thus in t传 真：0635-8888109he space occupied by the primary and secondary windings, a flow direction of the winding axis direction perpendicular to the magnetic flux leakage. leakage flux as the lateral leakage flux leakage reactance in the primary and secondary windings, the reactance called transverse leakage reactance. Belong to small and medium-sized dry type power transformers. Horizontal electric resistance in the winding of the total electricity Hang a small proportion, generally larger with a separate regulator winding the OLTC dry-type power transformers transverse reactance.
In the traditional winding Hang leakage magnetic energy method, the leakage flux method and the average charge distance method.

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