Dry-type power transformers are widely used electrical equipment in power systems. Compared with oil-immersed transformers, they have advantages such as fire prevention, explosion-proof, pollution-free, and maintenance-free. Their cooling methods mainly include natural air cooling (AN) and forced air cooling (AF). This type of transformer is suitable for places with high safety and en... moreDry-Type Transformer https://www.tenrony.com/products/dry-type-transformer/ #dry#type#transformer#factory
Dry-type power transformers are widely used electrical equipment in power systems. Compared with oil-immersed transformers, they have advantages such as fire prevention, explosion-proof, pollution-free, and maintenance-free. Their cooling methods mainly include natural air cooling (AN) and forced air cooling (AF). This type of transformer is suitable for places with high safety and environmental protection requirements, such as high-rise buildings, hospitals, schools, shopping malls, and other densely populated areas, as well as some industrial places with special fire protection requirements.
Key Features of Dry-Type Transformer
The product features of this resin-insulated dry-type transformer are as follows. It adopts a no-filler insulation design, with coils encapsulated in epoxy resin, featuring flame retardancy, fire resistance, explosion-proof, maintenance-free, and pollution-free properties. It has a compact structure and can be directly installed at the load center.
The design and casting process are scientifically reasonable, which can reduce partial discharge, lower noise, and enhance heat dissipation. Under forced air cooling conditions, it can operate at 140% of the rated load for a long time.
It is equipped with an intelligent temperature control device, featuring fault alarm, over-temperature alarm, over-temperature trip, and black start functions. It can also be connected to a computer via an RS-485 serial port for centralized monitoring.
It has a wide range of applications and can be used in power transmission and transformation systems, as well as in important places such as hotels, airports, and high-rise buildings. It can also adapt to harsh environments such as subways, smelters, and ships.
Advanced Safety Features of Tenrony Dry-Type Transformers
The SC(B) series three-phase epoxy resin cast dry-type and dry-type on-load transformers produced by our company are products designed and manufactured in accordance with national standards by introducing advanced dry-type transformer production technology from abroad. The core of this series of products is manufactured by advanced equipment, such as fully automatic transverse shearing lines, and the windings are wound by digital foil high and low voltage winding machines. The coils are cast by fully automatic digital casting equipment. The scientific casting process enables the resin to fully penetrate between turns, layers, and sections. How to prevent the casting body from cracking, control the generation of residual bubbles in the casting body, and reduce the partial discharge to the minimum limit has always been a major issue for dry-type transformer manufacturers at home and abroad, and it is a key manufacturing technology for resin cast dry-type transformers. Our company has successfully solved this cutting-edge problem through repeated production practices and frequent physical and chemical tests. The technical performance indicators of the products fully comply with the national standard GB1094.11-2007, and the technical parameters comply with the GB/T10228-2008 standard, and also conform to the principles of GB1094.11, GB/T10228, IEC60076, etc. The technical performance of the products can reach the level of HTT products. This series of products features high efficiency and energy saving, impact resistance, good flame retardancy, low partial discharge, strong overload capacity, small size, low noise, automatic temperature control, no pollution, and maintenance-free.
Dry-Type Transformer FAQs
Q
What are the primary advantages of a dry-type transformer compared to an oil-immersed type?
A
Dry-type power transformers are widely used electrical equipment in power systems. Compared with oil-immersed transformers, they have advantages such as fire prevention, explosion-proof, no pollution, and maintenance-free. Their cooling methods mainly include natural air cooling (AN) and forced air cooling (AF). This type of transformer is suitable for places with high safety and environmental protection requirements, such as high-rise buildings, hospitals, schools, shopping malls, and other densely populated areas, as well as some industrial sites with special fire protection requirements.
Q
Are protective enclosures with specific IP ratings available for indoor and outdoor installations?
A
The transformer is without a casing and has a protection grade of IP00. As it is not advisable to touch or approach the transformer during operation, it is recommended to use a protective fence to ensure safety. The protective casing provides further safety protection for the transformer. The protection grades available include IP31, IP30, IP21, IP20, etc. The casing materials available for users to choose from include cold-rolled steel plate, stainless steel plate, and aluminum alloy.
Q
Operation Monitoring
A
To ensure the normal operation of the transformer, regular inspection and maintenance are required. The specific requirements are as follows:
The temperature display value of the temperature controller should be frequently monitored to keep track of the transformer's operating conditions promptly.
The operating noise of the transformer should be frequently monitored to listen for any abnormal sounds, especially discharge sounds.
In a dark environment, observe whether there is any abnormal discharge on the surface of the transformer coils and spacers.
For transformers with a Yyn0 connection, the neutral current should be monitored. The maximum value of this neutral current should not exceed 25% of the low-voltage phase current; an excessively high neutral current may cause severe three-phase voltage imbalance, affecting power supply safety.
When the transformer has the following conditions, such as abnormal fan operation, abnormal temperature display, and minor cracks in the appearance of the winding resin insulation, it is not allowed to operate beyond the nameplate rating. The cause should be investigated, and the manufacturer should be contacted for confirmation.
Q
What routine maintenance is recommended for Tenrony dry-type transformers?
A
Precautions for transformer maintenance:
The main inspection items include the dust accumulation on the surface of the coil and whether there is discharge on the surface of the coil and the surface of the spacer.
The inspection of dust accumulation on the surface of the coil should be carried out under sufficient illumination, while the inspection of surface discharge should be conducted in a dark environment.
The locations for power-off cleaning mainly include the surfaces of the coil and the upper and lower end faces, the surfaces of the spacers, and both sides of the air ducts, as detailed in the transformer body assembly diagram.
If it is impossible to perform power-off cleaning at the prescribed frequency due to special reasons, the manufacturer should be informed for assessment.
If the operation site has a distinct rainy season, it is recommended to carry out power-off cleaning before the rainy season and increase the frequency of transformer operation checks during the rainy season and periods with large temperature differences between day and night.
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