What are the advantages and disadvantages of dry-type transformers?
Writer： Hengfeng you electric Time：2023-03-22 views：times
Dry type transformers rely on air convection for cooling, usually for local lighting and electronic circuits. In brief, dry-type transformer refers to the transformer whose core and winding are not immersed in insulating oil. However, this transformer has many significant functions:
1. Safety: dry-type transformer has no combustible resin, does not support combustion, is flame retardant, does not explode and release toxic gases, does not harm the environment, other equipment and human body, and is insensitive to humidity, dust and pollution. There is no partial discharge and no possibility of "cracking" during operation.
2. Reliability: NOMEX insulation material is used for high and low voltage coils, which are impregnated with class H solvent-free impregnating varnish for many times through VPI vacuum pressurizing equipment, and cured by high-temperature baking for many times. The product is Class H (180), while the main insulating material is Class C (220), with strong overload capacity and good short-circuit resistance. Under the condition of good ventilation, 20% overload operation is allowed.
3. Energy conservation and environmental protection: steel and other materials are easy to be recycled after the end of product life; All NOMEX paper used will not release toxic substances when burning; Other insulating materials are degradable and do not pollute the environment; Low product consumption and energy conservation; Low noise and flexible design.
Because there is no oil in the dry-type transformer, there will be no fire, explosion, pollution and other problems. Therefore, the electrical specifications and regulations do not require the dry-type transformer to be placed in a separate room. The loss and noise are reduced to a new level, creating conditions for the transformer and low-voltage panel to be placed in the same distribution room.
1. Good fire resistance, no flammable resin, no toxic gas, flame retardant and self extinguishing.
2. Low loss and noise
3. No pollution and maintenance
4. Good insulation performance, no partial discharge, strong lightning impulse resistance.
5. Good mechanical strength, strong resistance to temperature change and short circuit.
6. It is resistant to humidity and can work under high humidity.
7. The installation is economical, without special foundation, and can be installed together with the load center.
8. Small size and light weight
9. Automatic temperature monitoring and protection
Disadvantages of dry-type transformer:
1. The cost is high, and the ability to withstand harsh environments is relatively poor. Generally, it can only be installed indoors.
2. If the coil of dry-type transformer is broken, it shall be scrapped directly.
3. The dry-type transformer is durable, and the probability of winding failure is very small. But once it fails, the whole setting will change, that is, replace the high and low voltage windings with limbs.
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