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变压器过流是什么原因?

所谓过流如果是指变压器输入电流过流的话可能有以下原因:
The so-called over-current, if it refers to the transformer input current over-current, may have the following reasons:
1.济南变压器厂家http://www.jnwdsh.com/变压器饱和,众所周知,变压器绕组在交流电下会表现出感性,其交流阻抗较大,且其阻抗大小与磁导率成正比。同时磁性材料都有饱和磁通密度,如果变压器设计不当或者发生偏磁现象就会使得变压器工作磁密过高,当大于饱和磁密时,磁导率掉为0,此时变压器交流阻抗基本只剩下电阻阻抗,相当于直接把电源正负极接在一根导线上,后果可想而知。在开关电源中,推挽拓扑中经常发生这个现象,一般会在原边串联电容解决偏磁问题。
1. transformer saturation, as we all know, transformer windings in the AC will show perceptual, and its AC impedance is larger, and its impedance size and permeability is proportional to. At the same time, the magnetic materials have saturation flux density, improper design or if the transformer magnetic bias will make the transformer magnetic flux density is too high, when greater than the saturation magnetic flux density, magnetic permeability dropped to 0, then only the basic AC impedance transformer impedance, the equivalent power supply directly to the negative electrode is connected to a wire, the consequences as can be imagined. In switching power supply, this phenomenon often occurs in push-pull topology, which usually solves the magnetic bias problem at the primary side of series capacitor.
2.负载短路!!
2. load short circuit!!
3.变压器绕组绝缘没有做好,出现匝间短路或者原副边绕组短路。
3. transformer winding insulation is not done, there is an inter turn short circuit or a former side winding short-circuit.
4.一些磁芯材料的特性问题,比如设计时未考虑直流偏置和温度对磁导率的影响,在高温和高直流偏置下,导致变压器绕组阻抗降低,发生过流。
4. some core material characteristics, such as design without considering the influence of DC bias and temperature on permeability, under high temperature and high DC bias, leads to lower impedance of transformer windings and over-current.
自耦变压器与普通变压器相比有什么优点
济南变压器
What are the advantages of an autotransformer in comparison with an ordinary transformer?
1、由于变压器要使用多少硅钢片和铜线与绕组的容量有着直接的关系,而自耦变压器的绕组容量比普通变压器要低,这就使得自耦变压器使用的硅钢片和铜线更少,这样降低了成本;
1, how to use the transformer silicon steel and copper wire and winding capacity has a direct relationship, and the winding capacity of the autotransformer is lower than ordinary transformer, which makes use of the self coupling transformer silicon steel and copper wire less, thus reducing the cost;
2、因为自耦变压器比普通变压器所用的材料要少,也就是说硅钢片和铜线少,在磁通密度和电流密度一样时,自耦变压器的铜损耗和铁损耗都比较少,这样也就是效益提高了;
2, because of the autotransformer than ordinary transformer materials less than that of silicon steel sheet and copper wire, flux density and current density in the same time, since the copper loss and iron loss in transformer are less, so that improve the efficiency of;
3、自耦变压器的体积和重量都要比普通变压器要小的多,因此高低压成套设备自耦变压器运输更加便捷,安装更加简单;
3. The volume and weight of autotransformer are much smaller than that of ordinary transformer. Therefore, it is more convenient and easier to install self coupling transformer for high and low voltage equipment;
4、运输条件的不同使变压器的极限制造容量不同,而自耦变压器的运输条件要比普通变压器更加简单快捷,这就使得它的极限制造容量要比普通变压器大得多。
4, the different transportation conditions so that the transformer manufacturing capacity limit, and autotransformer transportation than ordinary transformer is more simple and quick, which makes its manufacturing capacity limit is much larger than ordinary transformer.
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