The occurrence of an outlet short circuit fault on the load side can cause a rapid increase in the temperature of the transformer winding.Mild cases can cause insulation aging of the winding,reduce equipment durability,further can lead to insulation failure and damage to the distribution transformer.The special winding structure used in power transformers determines that the hot spot temperature and position of the winding are difficult to obtain in practical tests,especially when the winding of amorphous alloy transformers adopts a rectangular structure,the risk of equipment burnout caused by outlet short circuit faults is greater.This article takes an SBH15 amorphous alloy transformer as an example and uses COMSOL simulation modeling to study the temperature distribution characteristics of the winding after the outlet short circuit fault,revealing the distribution law of temperature along the winding and the hot spot temperature value.Research has shown that the rectangular winding of amorphous alloy transformers has a higher temperature along the long axis than the short axis.The winding temperature in the low voltage state is higher than that in the high voltage state,and the maximum temperature is reached at the junction of the long axis in the low voltage state of the winding.Finally,specific suggestions were proposed to improve its heat resistance.
关键词
非晶合金/变压器/矩形绕组/出口短路/热点温度
Key words
amorphous alloy/transformer/rectangular winding/short-circuit/hot spot temperature
维普
万方数据