Transformer fever how to do?
?Equivalent aging principle is the transformer in the part of the running time of the winding temperature is lower than 95 ℃ or underload, then in another part of the time can make the winding temperature higher than 95 ℃ or overload, as long as the overload time more than the life of life is equal to Transformers in the under-load time less loss of life, both offset each other, it can still maintain a normal life.
????Transformer insulation aging six degrees principle:
????When the transformer winding insulation temperature in the range of 80 ~ 130 ℃, the temperature rise of 6 ℃, the insulation aging rate will be doubled, that is, the temperature rise of 6 ℃, the insulation life is reduced by 1/2, which is insulation aging "Six Degrees".
?National standard "dry-type transformers" GB6450-1986 on the dry-type transformer temperature limit to make the provisions. 1, the dry-type transformer coil, when the use of A-class insulation material, the ultimate operating temperature of 105 ℃, the maximum temperature rise should be less than 60 ℃; when the use of E-class insulation material, the limit operating temperature at 120 ℃ , The maximum temperature rise should be less than 75 ℃; when using B-class insulation material, the extreme working temperature at 130 ℃, the maximum temperature rise should be less than 80 ℃; when using F-class insulation material, the limit operating temperature at 155 ℃ , The maximum temperature rise should be less than 100 ℃; when the use of H-class insulation material, the limit operating temperature at 180 ℃, the maximum temperature rise should be less than 125 ℃; when using C-class insulation material, the extreme working temperature at 220 ℃ , The maximum temperature rise should be less than 150 ℃.
???The minimum temperature of the permissible transformer is the freezing point of the transformer oil, 10 # transformer oil, freezing point is not higher than -10 ℃; 25 # transformer oil, freezing point is not higher than -25 ℃; 45 # transformer oil, freezing point is not higher than -45 ℃ The
?????Transformer Equivalent Aging Principle
???National standard (oil-immersed transformer) the top of the oil temperature is generally adjusted at 85 ℃, if more than 85 ℃, to analyze the reasons: 1, if it is because the room temperature is too high, heavy load and other slowly rising, you can continue to run more than 85 ℃, but The maximum temperature can not exceed 95 ℃ (when the transformer core core or winding is 105 ℃, will seriously damage the insulation, shorten the life or burn the transformer); 2, the transformer running at 85 ℃, the transformer oil temperature and room temperature difference can not exceed 55 ℃, if it is over, may be a serious overload, the voltage is too low, the current is too large, internal failure, etc., continue to run will seriously damage the insulation, shorten the life or burn the transformer.
1, no-load heating is the transformer insulation is bad or the transformer input voltage is high, the insulation needs to rewound the coil, the input voltage is high need to reduce the input voltage or increase the number of turns.
2, if the voltage is normal, bring the load heat is heavy load, reduce the load can be cooled. Can not reduce the load, you can use the fan cooling.
3, if it is a small transformer, the original is normal, check the rectifier and load, there may be rectifier, capacitor and other short circuit, the current becomes hot.
4, if it is a power transformer, the following standards and principles.
