Research on Temperature Distribution of Outlet Short-circuit Hot Spots in Amorphous Alloy Transformer Winding
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.
amorphous alloytransformerrectangular windingshort-circuithot spot temperature
万方数据
维普
