Good heat dissipation conditions can increase the effective load of 40-50%
A good heat dissipation conditions can increase the effective load of 40-50%?
1, insulation structure of resin cast dry-type transformer is different from the traditional oil immersed transformer. He is solid become attached to structure, with epoxy resin, curing agent, flame retardants and other components of the thermal curing molding, with fire safety, maintenance free advantages. Mainly used for city network terminal users.
Oil immersed transformer to flow to obtain hot oil as insulating medium and heat dissipation conditions far better to cast resin dry type transformer, but he does not meet the city fire safety requirements and maintenance in large quantities.
2, the destruction of the insulation structure of electric power products is mainly caused by excessive temperature. Therefore, commonly used to define the insulation properties of the product, the common are: E, F, class H, and other insulation level of marking. Similarly, the temperature rise is the main indicator of the rated capacity of the dry type transformer. In technology, the relative temperature rise 100K is used as the basis for the design of the transformer rated capacity.
According to the general theory of electromagnetism, the dry type transformer in the design of the design has been set aside more than 60% of the design margin, such as:
Relative to the rated load, the current density of the conductor and the magnetic saturation density of the iron core are all increased by 60%.
3, it can be seen that the dry type transformer has a larger capacity. As long as the transformer can improve the heat dissipation conditions can greatly improve the load capacity of the transformer.
Commonly used method: increase the air cooling temperature control device. Of course, this device is also a product of the standard configuration.
Two, in the Shenzhen area to run earlier dry transformer why not configure the air-cooled temperature control device?
This is related to the power supply sector in Shenzhen area at that time. Due to the above technical reasons, in order to strengthen the management of the capacity increase, to avoid the operation of individual users to improve the operation of the transformer, and the formation of the unwritten rules.
But with the reform of power system and function, this provision has been canceled. Of course, it is mainly from the perspective of security electricity.
Three, the use of ordinary axial flow fan blowing transformer surface and air conditioning why cooling effect is very poor?
As the transformer structure from the inside to the outside in order: iron core, low-voltage coil, high voltage coil. The heat source is the core and the low voltage coil, and the high voltage coil of the outer surface is small because of the small current. Therefore, the fan blowing surface effect is not good.
Transformer at the time of manufacture, has been set aside special cooling duct, only equipped with special dry cooling fan, in order to achieve desired results. General purpose fan, power in the 30-80W/ station is very power saving.
Four, the temperature rise of the operating life of the dry changes have any effect?
The life of electrical products is determined by the aging degree of insulation structure, the main causes are: thermal aging and electrical aging. It plays a decisive role in the thermal aging, which affects the structural strength of the product by physical form, and then the final failure of the product can be achieved under the electric field.
Resin dry coil are mainly: conductors (copper wire, copper foil and so on) and matrix (epoxy system) and enhance the material composition, the thermal curing molding. Temperature can change the physical characteristics of the interface between the components and reduce the physical strength. Such as: the micro cracks between the turns of the coil can increase the partial discharge of the transformer, the size of the partial discharge determines the length of the life of the transformer.
The insulation level of the general dry type transformer is: F class, its theoretical tolerance temperature limit is: 155. Beyond this limit the physical strength of the coil will be the essence of a turning point, but also as the end of life.
In practical applications, due to the impact of structure, process and other differences, the actual standard is lower than the theoretical standard of 155 degrees, generally to 110.
1, insulation structure of resin cast dry-type transformer is different from the traditional oil immersed transformer. He is solid become attached to structure, with epoxy resin, curing agent, flame retardants and other components of the thermal curing molding, with fire safety, maintenance free advantages. Mainly used for city network terminal users.
Oil immersed transformer to flow to obtain hot oil as insulating medium and heat dissipation conditions far better to cast resin dry type transformer, but he does not meet the city fire safety requirements and maintenance in large quantities.
2, the destruction of the insulation structure of electric power products is mainly caused by excessive temperature. Therefore, commonly used to define the insulation properties of the product, the common are: E, F, class H, and other insulation level of marking. Similarly, the temperature rise is the main indicator of the rated capacity of the dry type transformer. In technology, the relative temperature rise 100K is used as the basis for the design of the transformer rated capacity.
According to the general theory of electromagnetism, the dry type transformer in the design of the design has been set aside more than 60% of the design margin, such as:
Relative to the rated load, the current density of the conductor and the magnetic saturation density of the iron core are all increased by 60%.
3, it can be seen that the dry type transformer has a larger capacity. As long as the transformer can improve the heat dissipation conditions can greatly improve the load capacity of the transformer.
Commonly used method: increase the air cooling temperature control device. Of course, this device is also a product of the standard configuration.
Two, in the Shenzhen area to run earlier dry transformer why not configure the air-cooled temperature control device?
This is related to the power supply sector in Shenzhen area at that time. Due to the above technical reasons, in order to strengthen the management of the capacity increase, to avoid the operation of individual users to improve the operation of the transformer, and the formation of the unwritten rules.
But with the reform of power system and function, this provision has been canceled. Of course, it is mainly from the perspective of security electricity.
Three, the use of ordinary axial flow fan blowing transformer surface and air conditioning why cooling effect is very poor?
As the transformer structure from the inside to the outside in order: iron core, low-voltage coil, high voltage coil. The heat source is the core and the low voltage coil, and the high voltage coil of the outer surface is small because of the small current. Therefore, the fan blowing surface effect is not good.
Transformer at the time of manufacture, has been set aside special cooling duct, only equipped with special dry cooling fan, in order to achieve desired results. General purpose fan, power in the 30-80W/ station is very power saving.
Four, the temperature rise of the operating life of the dry changes have any effect?
The life of electrical products is determined by the aging degree of insulation structure, the main causes are: thermal aging and electrical aging. It plays a decisive role in the thermal aging, which affects the structural strength of the product by physical form, and then the final failure of the product can be achieved under the electric field.
Resin dry coil are mainly: conductors (copper wire, copper foil and so on) and matrix (epoxy system) and enhance the material composition, the thermal curing molding. Temperature can change the physical characteristics of the interface between the components and reduce the physical strength. Such as: the micro cracks between the turns of the coil can increase the partial discharge of the transformer, the size of the partial discharge determines the length of the life of the transformer.
The insulation level of the general dry type transformer is: F class, its theoretical tolerance temperature limit is: 155. Beyond this limit the physical strength of the coil will be the essence of a turning point, but also as the end of life.
In practical applications, due to the impact of structure, process and other differences, the actual standard is lower than the theoretical standard of 155 degrees, generally to 110.
| Datetime：2016.03.29 From： Views：