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Dry-type transformers are widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil.

Overview:

Dry-type transformers are widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). In natural air cooling, the transformer can operate continuously for a long time under the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be kept in continuous overload operation for a long time.

Structure type

It is mainly composed of an iron core composed of silicon steel sheets and a coil made of epoxy resin. An insulating tube is placed between the high and low voltage coils to increase electrical insulation, and the line is supported and constrained by spacers.

The fasteners that overlap the ring and its parts all have anti-loosening performance.

Construction performance:

(1) Solid insulation encapsulated winding

(2) Unencapsulated winding

Winding: Of the two windings, the higher voltage is the high-voltage winding, and the lower one is the low-voltage winding.

From the relative position of the high and low voltage windings, high voltage can be divided into concentric and overlapping types.

Concentric windings are simple and convenient to manufacture, so this structure is adopted.

Overlap type, mainly used for special transformers.

Structural characteristics of dry-type transformers

Because dry-type transformers have the advantages of strong short-circuit resistance, small maintenance workload, high operating efficiency, small size, and low noise, they are often used in places with high performance requirements such as fire prevention and explosion protection.

1. It is safe, fireproof, pollution-free, and can be directly operated in the load center;

2. Adopting domestic advanced technology, high mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability and long service life;

3. Low loss, low noise, obvious energy saving effect, rabbit maintenance;

4. Good heat dissipation performance, strong overload capacity, and capacity operation can be increased when forced air cooling;

5. Good moisture-proof performance, adapt to high humidity and other harsh environments;

6. Dry-type transformers can be equipped with a complete temperature detection and protection system. Using intelligent signal temperature control system, it can automatically detect and circulate display the respective operating temperatures of the three-phase windings, can automatically start and stop the fan, and have functions such as alarms and trips;

7. Small size, light weight, less space and low installation cost.