淮安干式变压器：淮安干式变压器绝缘

淮安干式变压器绝缘 　　
淮安干式变压器的绝缘对于产品能否安全运行起着决定性作用.因此淮安干式变压器的绝缘结钩及其绝缘材料要求比油浸式严重得多，同时它应具有难燃性。该产品的出现是随着要求防火场合的增多而迅速发现起来的.当然和绝缘材料的技术进步也是分不开的。
淮安干式变压器的绝缘水平各国有所差异，我国采用的标准：GB6450-1986《淮安干式变压器》是等效采用国际标准IEC762(1982)《下式淮安干式变压器》，
一般淮安干式变压器多数为户内式装置，其所承受的雷电冲击电压(峰值)联系人：陈经理及工频受电压(方均根值).均低于安装于户外的油浸式配电淮安干式变压器的试验电压。由此可见，对6kV以上电压等级户内外装置的试验电压之比约在120%以上，其根本原因是由于安装于户内的淮安干式变压器遭受雷电冲击波电压作用较低。
淮安干式变压器绕组在短路电流作用下，即在外部短路时的热、动稳定效应下应无损伤。
外部短路包括三相短路、两相接地和相对地故障，这些故障在绕组中引起过电流，并在此过电流而导致的机械力作用下，可产生某些运行的缺陷，但这些故障仍可满足标准的要求，即可认为无损伤。
树脂绝缘淮安干式变压器，除具有良好的电气、机械性能外，还由于树脂的优异化学稳定性，因此该产品对潮湿、尘埃等大气污染的承受能力强。
淮安干式变压器绝缘中存在某些弱点，如浇注绝缘和绕包绝缘中含有气隙时.就会在高电场作用下发生局部放电，这是制造厂和使用部门关心的问题之一，因为它腐蚀绝缘，导致绝缘劣化.甚至发生绝缘击穿，当然会对安全运行构成威胁。在JQ/T56009- 1998 《淮安干式变压器产品质量分等》中明确规定了局部放电量要求。
淮安干式变压器的局部放电量，是对产品设计.特别是对制造工艺的严格考验。
淮安干式变压器绝缘主要是高耐热等级的绝缘材料和空气组成的复合绝缘系统。在工频电压作用下，绕组间场强分布可以认为基本是均匀的。此时与辐向电场差别不大;但在雷电冲击电压下，绕组出线端场强较高。则轴向电场分量将对复合电场有较大影响.从而使绕组电场分析变得复杂。对于绕组端部到铁轭间电场分布是极不均匀的，用分析方法求解是不可能的，只有采用数值计算方法才有可能求解端部电场。
淮安干式变压器的绝缘同油浸式淮安干式变压器的绝缘一样.对安全运行具有十分重要意义。绝缘结构及其绝缘材料在外部异常电压下发生损坏，或在正常电压下绝缘的加速劣化，均将影响淮安干式变压器运行，因此保证绝缘结构的合理性和选用材料的正确性是淮安干式变压器的首要要求。

Dry type power transformer insulation

Dry-type power transformer insulation plays a decisive role in the product can safely run dry-type power transformer insulation knot hook and insulating materials require much more serious than the oil-immersed, it should have a flame resistance. The products with the requirements of the increase in fire situations to quickly detect up course and insulating materials of technological progress are inseparable.
Dry-type power transformer insulation level of countries differ, of standard: GB6450-1986 "dry-type power transformers" is equivalent to international standards IEC762 (1982) "under the power transformer",
General most of the dry type power transformers for indoor devices, their lightning impulse withstand voltage (peak) and power frequency by voltage (RMS value) were lower than the voltage of the oil-immersed distribution transformers installed in the outdoor test. Thus, the voltage level indoor and outdoor installations of more than 6kV test voltage ratio of about 120% or more, the fundamental reason is due to the dry type power transformers installed indoors in the role of being subjected to lightning shock wave voltage lower.
Dry-type power transformer windings under short-circuit current, the heat in the external short circuit, dynamic stabilizing effect should be no damage.
External short-circuit three-phase short-circuit, two phase to ground fault, these faults in the windings caused over-current and over-current, and in this mechanical force, can produce some running defects, but these failures are still to meet the requirements of the standard can be no damage.
Resin insulation dry-type power transformers, in addition to good electrical and mechanical properties, excellent chemical stability of the resin, the product is the capacity of moisture, dust and other air pollution.
Dry type power transformer insulation, there are some weaknesses, such as pouring insulation and around containing the air-gap in the insulation partial discharge occurs at high electric field. This is one of the factories and the use of departments most concerned about, because corrosion insulation, resulting in insulation degradation, and even insulation breakdown, of course, would be safe to run pose a threat. In the dry type power transformer product quality grading "JQ/T56009- 1998" clearly provides for the partial discharge requirements.
The dry type power transformers, partial discharge of product design, especially the most stringent tests of the manufacturing process.
The dry type power transformer insulation is a high heat insulating material and air composite insulation system. Power frequency voltage is applied between the windings of the field distribution that is basically uniform. The radial electric field is not very different; lightning impulse voltage winding outlet end of the field strength is higher. The axial electric field component of the composite electric field will have a greater impact. So that the winding farm complicate the analysis. The electric field distribution between the winding end to a yoke of iron is very uneven, with analytical methods for solving it is impossible, only by numerical calculation to be possible to solve the end of the electric field.
Dry type power transformers insulated with oil-immersed transformer insulation has very important significance to the safe operation. The insulation structure and insulating materials under abnormal voltage of the external damage, or accelerated aging in the normal voltage insulation will affect transformer operation, thus ensuring reasonable insulation structure and selection of the correctness of the material is dry-type power transformer primary requirements.

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