Views: 0 Author: Site Editor Publish Time: 2024-12-30 Origin: Site
Dry-type transformer is a special kind of power transformer, which is characterized by the fact that the iron core and winding are not impregnated in the insulating oil.
Dry transformers usually have two cooling methods, one is natural air cooling (AN), when the transformer is running under the rated capacity, mainly rely on natural air convection for heat dissipation, this time does not need to rely on additional cooling equipment can be long-term continuous operation; The other is forced air cooling (AF). When the transformer working environment reaches 80 degrees, the temperature control system will automatically start the fan for forced air cooling, through the forced air flow, can significantly improve the heat dissipation efficiency of the transformer, so that the transformer can still maintain normal operation under overload or high temperature environment. Simply put, it is cooled by air flow, if the temperature is too high, it is assisted by the fan.
Dry transformers mainly use epoxy resin as insulation material, and through a variety of process methods to ensure insulation effect, specific types include: epoxy quartz sand mixture vacuum casting type, epoxy non-alkali glass fiber reinforced vacuum differential casting type, non-alkali glass fiber winding impregnated type.
High safety: dry transformer does not contain flammable and explosive oil, so it is not easy to fire or explosion accidents during operation, which greatly improves the safety of use. At the same time, dry transformer has good electrical insulation performance, can effectively prevent the occurrence of leakage and short circuit phenomenon.
Good environmental protection: Because the dry transformer does not use oil as a cooling and insulating medium, it will not produce oil pollution and is environmentally friendly.
High efficiency and energy saving: Dry-type transformers are designed and manufactured with a focus on improving energy efficiency and reducing losses. By optimizing the coil structure, using efficient insulation materials and advanced manufacturing processes, dry transformers can maintain low energy consumption and high efficiency during operation.
High reliability: Dry transformers use advanced manufacturing processes and materials, with a long service life and high reliability. Under normal operating conditions, the dry-type transformer has a low failure rate, which can ensure the stable operation of the power system.
Poor moisture-proof and dust-proof performance: The dry-type transformer has relatively weak protection against moisture and dust. When used in humid or dusty environments, additional protective measures may be required, such as setting protective covers or building special switchboards to protect their insulation properties.
Resistance to harsh environment is relatively poor: compared with oil-immersed transformers, dry transformers are generally more suitable for installation in indoor environments. When used outdoors, special attention needs to be paid to its protection and heat dissipation to ensure its normal operation and extend its service life.
High requirements for insulating materials: dry transformers have high requirements for insulating materials, and need to use materials with good thermal conductivity and insulation, such as specially treated epoxy resin. This will also increase their manufacturing costs.
Once the coil is damaged, it is difficult to repair: Once the coil of a dry transformer is damaged, it is usually difficult to repair it locally, and it needs to be replaced as a whole. This increases the complexity and cost of maintenance.
