变压器线圈烧坏或脱落的几种原因（Several causes of transformer coil burn or fall off）.doc

变压器线圈烧坏或脱落的几种原因（Several causes of transformer coil burn or fall off） .txt transformer coil burned out or fall out several reasons why you cant change others, but you can change yourself; you cant change the weather, but you can change the mood; you cant change the length of life, but you can expand the width of it. In the power system, the distribution transformer occupies an extremely important position, once burned, will directly or indirectly to industrial and agricultural production and the loss of the normal life of the people. 1 cause analysis 1.1 insulation performance exceeded standard 1.1.1 transformer current surge With the in-depth transformation of urban and rural power grids, city and rural electricity consumption has increased greatly, but as part of low voltage line maintenance is not in place, have greatly increased the possibility of load and short circuit, so that the transformer current exceeds the rated current is several times or even several times, at this time, by the influence of electromagnetic torque and winding displacement deformation. As the current increases sharply, the coil temperature of the distribution transformer rises rapidly, resulting in accelerated insulation aging, forming debris fall off, resulting in bare line caused by inter turn short-circuit, burned distribution transformers. 1.1.2 winding insulation is damp This failure is mainly due to poor insulating oil or oil surface degradation. When the A. transformer is not put in, the moisture intrusion will damp the insulation; or the transformer is in the damp place, rainy area, and the humidity is too high. During the storage, transportation and operation of B., improper maintenance of water, impurities or other oil contamination into the oil will greatly reduce the insulation strength. When the C. is manufactured, the inner layer of the winding is not immersed in paint, the drying is not thorough, the welding of the lead wires of the winding is poor and the insulation is not