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Introduction to the structure type and characteristics of dry high voltage transformer

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structure type

It is mainly composed of a core composed of silicon steel sheets and a coil made of epoxy resin. An insulating cylinder is placed between the high and low voltage coils to increase electrical insulation, and the coils are supported and restrained by the spacers. Loose performance.

Construction performance:

(1) Solid insulation encapsulation winding

(2) does not encapsulate the winding

Winding: Among the two windings, the higher voltage is the high voltage winding and the lower is the low voltage winding.

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

Concentric windings are simple and easy to manufacture, all using this structure.

The overlapping type is mainly used for special transformers.

Structural features

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

  • 1. Safe, fireproof, non-polluting, can be directly operated at the load center;
  • 2. Adopting domestic advanced technology, high mechanical strength, strong resistance to short circuit, small partial discharge, good thermal stability, high reliability and long service life;
  • 3. Low loss, low noise, obvious energy saving effect, maintenance free;
  • 4. Good heat dissipation performance, strong overload capacity, and increased capacity operation when forced air cooling;
  • 5. Good moisture resistance, suitable for high humidity and other harsh environments;
  • 6. Dry-type transformers can be equipped with a complete temperature detection and protection system. The intelligent signal temperature control system can automatically detect and patrol the respective working temperatures of the three-phase windings, automatically start and stop the fan, and have alarm, trip and other function settings;
  • 7. Small size, light weight, less floor space and low installation cost.

Iron core

The high-quality cold-rolled grain-oriented silicon steel sheet is used, and the iron-core silicon steel sheet adopts a 45-degree full oblique joint to pass the magnetic flux along the joint direction of the silicon steel sheet.

Winding form

(1) winding;

(2) epoxy resin plus quartz sand filling and pouring;

(3) glass fiber reinforced epoxy resin casting (ie thin insulation structure);

(4) Multi-strand glass-impregnated epoxy-wound type (usually 3 is used because it can effectively prevent cracking of the poured resin and improve the reliability of the equipment).

High voltage winding

Multi-layer cylindrical or multi-layer segmented structures are generally employed.

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