丽江干式变压器：丽江干式变压器及其附件

丽江干式变压器及其附件 　　
丽江干式变压器从其绕组上可分为浸渍式(开启式)及封闭式，其中封闭式主要是树脂绝缘绕组，即浇注绝缘式绕组及绕包绝缘丽江干式变压器。
浸渍式丽江干式变压器绕组与油浸式绕组结构基本相同.制造工艺过程也基本相同，通常属于中小型丽江干式变压器范围，只是其导线绝缘材料及其耐热等级与油浸式不同，通常为B,F和H级。
浸渍式丽江干式变压器绕组，高压绕组采用多层层式、连续式；低压绕组采用螺旋、双螺旋式。绕组绕制完后进行真空加压浸漆处理。
为提高散热能力，额定容量在800kVA(或1600kVA')以上的丽江干式变压器，采用轴流风扇冷却系统，以散出铁心及绕组损耗所产生热量，从而满足温升要求。
封闭式绕组主要是树脂绝缘丽江干式变压器绕组.国内外生产的树脂绝缘干变，主要是浇注绝缘和绕包绝缘干变绕组，两者均为包封式绕组，其差别是制造工艺不同。
树脂绝缘的浇注和绕包绝缘所采用的绝缘胶，均以环氧树脂为基材，其配方也大同小异。
浇注绝缘丽江干式变压器的绕组是在真空条件下进行浇注的，因而必须备有特制的浇注模具及真空罐。浇注过程中应排出绝缘中的气隙和气泡，真空浇注所制成的绕组绝缘应均匀，由此消除绕组绝缘内部局部放电的可能性，这点对浇注绝缘非常重要。
绕包绝缘丽江干式变压器的绕组是通过胶槽挂以绝缘胶，在特殊设计的绕包机上绕制完成.并在旋转固化罐中加热固化成刚体，绕包绝缘的高低压绕组可以在同一绕线模上绕制.也可单独绕制，可以线绕或箔绕。当容量较大时，在制造工艺上采用箔绕较为方便。
绕包绝缘绕组是在非真空条件下绕制完成的，为了排出绝缘中的气泡，可在绝缘胶的混胶，制造工艺上采取措施，以保证局部放电指标满足要求。
绕包绝缘干变的绕组在绕制和固化后，表面应稍加修整，提高表面光洁度。
树脂绝缘丽江干式变压器有带外壳和不带外壳两种型式。外壳有钢板制造的和铝合金制造的，
丽江干式变压器由于采用空气作为绝缘和冷却介质，其结构尺寸和质量均大于同电压等级及同容量油浸式丽江干式变压器的尺寸和质量，从而其制造成本也较油浸式高。

Dry-type power transformers and their accessories
Dry-type power transformers can be divided into its winding the impregnated (open type) and closed-end, which closed the main resin insulation winding pouring insulation winding and wrapping the insulation dry-type power transformers.
Impregnated dry type power transformer windings with oil-immersed winding structure is basically the same. Manufacturing process is basically the same, usually belonging to small and medium-sized transformers range, just wire insulation materials and their heat level and oil-immersed, usually B F and H level.
Impregnated dry type power transformer windings, high voltage winding multi-layer, continuous; using low-voltage winding spiral, double spiral. The winding wound after vacuum pressure Impregnation processing.
To improve the cooling capacity, rated capacity, the use of dry-type power transformers above 800kVA (or 1600kVA '). Axial fan cooling system, to shed the core and winding losses generated heat to meet the temperature rise requirements.
Closed winding resin insulation dry type transformer winding. Production of resin insulation dry change at home and abroad, mainly pouring insulation and wrapped insulation dry type transformer winding, both encapsulation winding, the difference is that the manufacturing process.
Plastic insulation are epoxy pouring resin insulation and wrapped insulation used as the substrate, the recipe is also very much the same.
Casting insulation dry-type power transformer winding is carried out under vacuum casting, which must be equipped with a special casting molds and vacuum tank. Should be discharged in the casting process and bubble air gap insulation, vacuum casting made of winding insulation should be uniform, thereby eliminating the possibility of winding insulation internal partial discharge, which is a very important point of pouring insulation.
Wrapped insulation dry-type power transformer windings are specially designed around the charter by hanging plastic insulation, plastic tank completion of the winding and in the rotation curing tank heating solidified into a rigid body, high and low voltage windings wrapped insulation in the same wound on the winding mold. individually wound wirewound or foil around. When larger capacity in the manufacturing process the foil around more convenient.
The wrapped insulated winding is wound in a non-vacuum conditions, and discharge of air bubbles in the insulation, insulated rubber mixed glue, manufacturing process to take measures to ensure that the indicators meet the requirements of the partial discharge.
Wrapped insulation dry type transformer windings are wound and cured, the surface should be a little trimming to improve the surface finish.
Resin insulation dry-type power transformers with shell and without shell two kinds. Shell steel plate and aluminum manufacturing,
Dry type power transformers due to the use of air as an insulating and cooling medium, size and quality of its structure are greater than the size and quality of the same voltage level and oil-immersed transformer of the same capacity, and thus its manufacturing costs than oil-immersed high.

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