The Basics of Dry-type Transformers

Dry-type transformers are those in which the core and windings are not immersed. Dry-type transformers are those in which the core and windings are not immersed, and the coil and core are cast together and are naturally cooled or air-cooled.

Types of dry-type power transformers.

1. Impregnated air insulation dry-type transformer: currently used little. Winding wire insulation, insulation structure material according to the need to choose different heat resistance level of insulation materials, made of B level, F level, and H level insulation dry-type transformer.

2.Epoxy resin cast dry-type transformer: the insulating materials used are polyester resin and epoxy resin. At present, the epoxy resin is used mostly in pouring insulation dry-type power transformer.

3. Wrap-around insulation dry-type transformer: wrap-around insulation dry-type transformer is also a kind of insulation of resin, at present the manufacturer is less.

4. composite insulation dry type transformer.

(1) The high-voltage windings are cast and the low-voltage windings are impregnated with insulation.

(2) High voltage is cast and low voltage is foil winding with copper and aluminum foil.

Installation of dry-type transformer

1. the installation site of the transformer must be clean and dry, in the infrastructure construction is not basically completed the best transformer should not enter the field, to avoid the transformer by field construction damage and insulation damage. Transformer mobile entry should not damage any parts of the transformer, especially the fan, core, external voltage regulation connection copper rod, and high and low voltage insulators. A transformer in the loading and hanging, but also pay special attention to the safety of personnel when moving, to prevent tipping and out of control.

2. The installation of the transformer is relatively simple. (1) Just insert the thermometer sensor wire into the corresponding socket of the temperature display, and fix the screws. (2) And connect the two groups of high and low voltage fan power cables to the terminals of the temperature controller's corresponding logo. (3) A power cord is connected to the switch, and a power cord is connected to the terminal of the temperature controller.

3. The transformer in place must take into account the transformer coil and the metal parts of the (ground) insulation distance, as well as high-voltage cable joints, high-voltage connecting copper rod and shell distance, must comply with the voltage level to ground insulation distance. As the high-voltage connecting rod our company has the corresponding voltage level of heat-shrinkable insulation sleeve encapsulation, so can be lower than the normal insulation distance in the air requirements.

Advantages of Resin Insulation Dry-type Transformer 

1. Resin insulation dry-type transformer flame retardant, non-polluting, can be installed directly in the load center. Maintenance-free, easy to install, low operating costs.

2. Shell can have good moisture resistance, in normal operation, without pre-drying at 100% humidity can run the transformer.

3. Small loss, lightweight, small size, low noise, good heat dissipation, in forced air-cooled conditions can be 150% rated load operation.

4. Equipped with a complete temperature protection control system, to provide reliable protection for the safe operation of the transformer.

5. High reliability. The test results of the products that have been put into production show that the reliability index has reached the international advanced level.

If you want to get more information about good quality insulated dry-type transformers, please contact us.