新余干式变压器：新余干式变压器主要绝缘材料

新余干式变压器主要绝缘材料 　　
新余干式变压器的绝缘结构及其绝缘材料是保证可靠性的重要指标，由于新余干式变压器的结构型式不同.所用的主要绝缘材料也不同，至于新余干式变压器的铁心所用的晶粒取向冷轧硅钢片.绕组所用的钢、铝导线也与油浸式新余干式变压器相同。只是新余干式变压器导线绝缘、主绝缘结构及其他绝缘材料有所差异，因此只就新余干式变压器所用绝缘材料作概要介绍。
1.芳香族聚酰胺纤维纸(Nomex)
芳香族聚酰胺纤维纸是浸渍式新余干式变压器的导线绝缘、引线包扎绝缘等所用的主要绝缘材料。它属于耐高温(H级)的合成纤维材料。
聚芳酰胺纸是线型聚合物.其长分子链中有数百个芳核，分子量为6-12万，由于分子链主链完全由芳核组成，且与氮原子相连的为苯环而不是脂肪烃，故芳香族聚酰胺纸具有很高的耐热性；又因分子链中仍保持酰胺链.因而具有脂肪族酰胺的良好物理机械性能，还由于分子链为间、对位结构.能形成高结晶态，从而使聚合物具有良好的介电稳定性。
芳香聚酰胺绝缘纸和纸板的耐热等级为H级，若新余干式变压器绝缘的耐热等级为其他等级时，如B级、F级时，则应选用相应耐热等级的绝缘材料。

2.浸渍漆
浸渍漆分为有溶剂和无溶剂两类。浸渍漆主要用于浸渍新余干式变压器绕组.其目的是填充绝缘间的间隙和微孔，浸渍漆经烘焙固化后，可在绝缘表面形成连续平整的漆膜，并使绕组粘结成坚固的整体，提高绝缘结构的耐潮、导热、机械特性和耐电强度。
通常对浸渍漆的要求：
(1)粘度低.固体含量高，便于漆透和填充浸渍物。
(2)厚层固化快.干燥性好，粘结力强，有热弹性.固化后能承受短路机械力的作用。
(3)具有较高电气性能、耐潮性、耐热性、耐油性和化学稳定性，对导体材料和其他材料相容性好。

3.绝缘胶
浇注绝缘和绕包绝缘新余干式变压器绝缘，我国多采用以环氧树脂为基料，加以固化剂.促进剂而制成的F级绝缘体系，浇注绝缘与绕包绝缘两者的差别只是工艺不同。采用环氧树脂固化时无低分子物放出，并在绝缘胶中加以适量的消泡剂.从而达到消除绝缘中气泡的日的。
绝缘胶与无溶剂漆相似.但粘度较大一般作为浇注绝缘用时加有填料。随环氧树脂和促进剂的改进，绝缘胶还向用于更高电压等级产品方向发展。

Dry-type transformer insulating materials

Dry-type transformer insulation structure and insulating materials to ensure the reliability of an important indicator of the insulating materials of different structural types of the dry-type transformers. As for the grain-oriented cold rolled silicon steel core dry-type transformers winding used in steel, aluminum wire and oil-immersed transformer. Dry type power transformer wire insulation, main insulation structure and other insulation materials vary, so the only dry-type transformers with insulating material for an overview.
An aromatic polyamide fiber paper (Nomex)
The aromatic polyamide fiber paper impregnated dry type transformers, wire insulation, wire wrapped insulation used in insulating materials. It belongs to the high-temperature (H) of synthetic fiber materials.
Aromatic polyamide paper is a linear polymer. Their long molecular chains in the hundreds of aromatic molecular weight of 6-12 million, fully aromatic main chain of the molecular chain, and connected with the nitrogen atom to the benzene ring rather than aliphatic hydrocarbons, aromatic polyamide paper is a high heat resistance; remains because of t华盈非晶合金变压器有限公司he molecular chain amide chain and thus has a good physical and mechanical properties of aliphatic amides, but also due to the molecular chain as between-bit architecture. form a highly crystalline, so that the polymer has good dielectric stability.
Class H, aromatic polyamide heat-resistant insulating paper and paperboard grades for certain type of transformer insulation level of heat for the other grades, such as Class B, F, should be chosen corresponding heat insulating material.

(2) impregnating varnish
Impregnating varnish is divided into solvent and solvent-free two types. Impregnating varnish for impregnated dry type transformer winding its purpose is to fill the gap between the insulation and porous, impregnating varnish by baking curing the continuous formation of the film formed on an insulating surface, and winding bonded into a solid whole improve the insulation structure resistant to moisture, thermal conductivity, mechanical properties and electric strength.
Usually impregnated paint requirements:
(1) low viscosity and high solids content, easy to paint thoroughly and fill the impregnated material.
(2) thick layer curing, drying, strong adhesive, thermo-elastic after curing can withstand short circuit mechanical force role.
(3) has a higher electrical performance, moisture resistance, heat resistance, oil resistance and chemical stability, conductors and other material compatibility.

3 plastic insulation
Only difference is pouring insulation and wrapped with insulation dry type transformer insulation, our use of epoxy resin as a binder to curing agent accelerator is made for class F insulation system, pouring insulation wrapped with insulation between the two different processes . Release of low molecular weight compounds, the use of epoxy curing and the plastic insulation to be an appropriate amount of defoamer. So as to eliminate bubbles in the insulation in the day.
Insulating adhesive and solvent-free paint, but the viscosity generally larger as a pouring insulation with added filler. With the improvement of epoxy resin and accelerator, the insulating adhesive grades for higher voltage direction.

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