Dry Resin Distribution Transformers

These are dry-type distribution transformers used for converting medium voltage electrical energy (6 kV to 35 kV) to low voltage (400 V to 420 V). The main insulation in these transformers is air.

The absence of oil or other insulating liquids makes them practically non-flammable, allowing installation close to energy consumers. They are especially well suited for supplying industrial plants, large stores, and high-rise buildings. They are primarily intended for indoor installations.

Specifications

Basic electrical parameters:

Rated power in kVA: 250, 400, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150 or larger up to 6000 on special order
Rated primary voltage in kV: 6.3 or 10.5 or 15.75 or 21 or 31.5 or others within the range of 6 kV to 35 kV
Rated secondary voltage in V: 400, 410, 420
Off-circuit tap changer voltage regulation: ± 2 × 2.5%
Connection group: Dyn5, Dyn11
Short-circuit voltage: 6%
No-load and load losses: in accordance with EU ECO Directive Tier 2 or individual customer requirements
Environmental class: E2 C2 F1
Insulation temperature class: F
If you are interested in other parameters, please contact us – further details can be provided upon request.

Dry Resin Transformers

We offer dry resin transformers in two manufacturing technologies:

With HV coils made using non-vacuum technology, where the main insulation of the windings is a roving-resin composite. These are RESIGLAS type transformers.
With HV coils made using vacuum technology. These are RESICAST type transformers or TRIHAL type (under Schneider Electric license).

Transformers can be supplied without enclosure (protection degree IP-00) or in enclosures with protection degrees IP-20, IP-21, or IP-31.

Transformers can be equipped with fan sets allowing temporary overloads up to 140% of their rated power.

RESIGLAS Resin Transformers

The high-voltage windings of these transformers are manufactured as layer-type coils using the wet roving method. They consist of alternating layers of copper or aluminum conductors with Class H varnish insulation and layers of roving (glass fibers) impregnated with epoxy resin. The roving makes up 60% to 70% of the total composite mass.
The roving bands are applied alternately longitudinally and diagonally. This structure forms a reinforcing mesh and provides exceptionally high mechanical strength to the entire composite. Therefore, the coils are resistant to cracking caused by temperature changes in the coils resulting from varying transformer loads.
For this reason, transformers of this type are particularly suitable for applications with large load fluctuations and heavy overloads, such as rectifier systems or power supply for tram and metro traction.

RESICAST and TRIHAL Resin Transformers (under Schneider Electric license)

The high-voltage windings of these transformers are manufactured using vacuum technology. The windings are wound with round wire using the “random” technique or with foil using the layer-winding technique. Coils made with this technology are enclosed in molds and vacuum impregnated with epoxy resin. Transformers built with this technology can be used in all typical applications.

Want to learn more? Feel free to contact us.

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