宁夏干式变压器：宁夏干式变压器温升

宁夏干式变压器温升 　　
运行中，宁夏干式变压器同油浸式宁夏干式变压器一样，铁心由于磁滞损耗、涡流损耗，绕组由于电阻损耗、杂散损耗及引线损耗等而产生热量。其中一部分热量储存于宁夏干式变压器的发热体中，使发热体本身温度升高；另一部分热量则散发于周围的介质中。宁夏干式变压器所有的电磁载体，如铁心、绕组、引线以及漏磁场所能交链的结构件等，均为发热体，其中铁心和绕组则为主要的发热体。发热体所产生的热量，除了使自身的温度升高外，也会使周围介质温度升高，特别是局部温升过高时可能造成绝缘过早损坏.或由于绝缘介质长期受高温作用而发生绝缘老化，也会逐渐地丧失绝缘性能，众所周知，宁夏干式变压器的寿命就是绝缘寿命，当要求宁夏干式变压器具有一定的寿命（如20-30年)，则其绝缘材料就应保证在一定的温度下具有相应的寿命。
宁夏干式变压器与油浸式宁夏干式变压器计算上的区别之一就在于温升计算。
各种绝缘材料的耐热等级的允许高工作温度是一定的。
由于应用场合对干变的要求较严格，因此.干变常用的耐热等级为B,F,H级绝缘材料应既具有耐高温，又要具有在故障时难燃和不爆的特点。
需要指出，提高绝缘材料的耐热等级，采用H绝缘等级是宁夏干式变压器当前的发展方向，这就要求绝缘材料的科研和厂家大力开发H级绝缘材料。

Transformer temperature rise
Run, the dry type power transformers with oil-immersed transformer core due to hysteresis loss, eddy current losses, winding to generate heat due to resistive losses, stray losses and lead loss. Part of the heat stored in the transformer heater, so that the heating element temperature; another part of the heat is distributed in the surrounding medium. Electromagnetic carrier of dry type power transformers, such as core, windings, leads, and leakage magnetic field that can be cross-linked structure, are the heating element, where core and winding is the main heating element. The heat generated by the heating element, in addition to making their own temperature, but also make the ambient华盈非晶合金变压器有限公司 temperature increases, especially the local temperature is too high may cause the insulation to premature failure. Or due to the insulating medium long-term high temperature insulation aging, will gradually lose their insulating properties, is well known that the life of the transformer insulation life, when the transformer has a certain life span (eg, 20-30 years), the insulation material shall ensure that at a certain temperature with the appropriate life expectancy.
One of the differences in the dry-type power transformers and oil-immersed transformer calculation is that the temperature rise calculation.
The heat level of various insulating materials to allow the maximum operating temperature is for certain.
Applications to dry the requirements become more stringent, dry type transformer heat-resistant grade of B, F, H class insulation material should be high temperature, but also has the characteristics of flame retardant in the failure and explosion.
It should be noted that, to improve the grade of heat insulating material, H insulation class is the current direction of development of the dry type power transformers, which requires research and manufacturers of insulation materials and vigorously develop the H-class insulation material.

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