Dry-type transformer structure type and structure characteristics

In the 1980s, the annual output of epoxy resin cast transformers was about 1000MVA, and by the 1990s, it had exceeded 10000MVA. The insulation class of Dry-type transformer has covered Class B, Class F, Class H, and Class C. Next, let's take a look at the Dry-type transformer structure types and structural features. Here are some answers.

Here is the content list:

l The structure type of the Dry-type transformer.

l What are the structural characteristics of a Dry-type transformer?

l Dry-type transformer cooling method

The structure type of the Dry-type transformer.

The Dry-type transformer is composed of a core made of cold-tied silicon steel sheets and a coil cast in epoxy resin. An insulating cylinder is placed between the high and low voltage coils to increase electrical insulation, and the coils are supported and constrained by spacer blocks. The fasteners that overlap the parts have anti-loosening properties. Dry-type transformer structure performance is solid insulation encapsulated winding and unencapsulated winding. Of the two windings, the higher voltage is the high voltage winding, and the lower is the low voltage winding. From the relative position of the high and low voltage windings, the high voltage is divided into homocentric and overlapping sorts. The homocentric winding is straightforward and convenient to manufacture. Dry-type transformers all adopt this structure. The overlap type is mainly used for special transformers.

What are the structural characteristics of a Dry-type transformer?

First, it is safe, fireproof, pollution-free, and might be directly operated within the load center. Second, adopting domestic advanced technology, high mechanical strength, strong short-circuit resistance, low partial discharge, good thermal stability, high reliability, and long service life. Third, low loss, low noise, obvious energy-saving effect, and maintenance-free. Fourth, the heat dissipation performance is good, the overload capacity is strong, and the capacity can be increased when the air cooling is forced. Fifth, it has good moisture resistance and is suitable for operation in high humidity and other harsh environments. Sixth, a Dry-type transformer can be equipped with a complete temperature detection and protection system. Using an intelligent signal temperature control system, it can automatically detect and circulate display the respective working temperature of the three-phase winding, can automatically start and stop the fan, and have an alarm, trip, and other functions. Sixth, the Dry-type transformer is small in size, light in weight, small in space, and low in installation costs.

Dry-type transformer cooling method

Dry-type transformer cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When natural air is cooling, the transformer can run continuously for a long time under the rated capacity. Once forced-air cooling, the output capability of the electrical device is exaggerated by five hundredths. It's appropriate 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.

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