Special Resin Transformers

Special resin transformers are devices designed to meet the most demanding operating conditions and unusual industrial applications.

They utilize dry resin insulation for the windings, providing high fire resistance, excellent mechanical strength, and minimal maintenance requirements. Thanks to precise customization of electrical and structural parameters, these transformers guarantee reliable power supply both for rectifier systems and installations in harsh environments, such as underground mining.
Below are the main categories and their characteristics.

Resin Transformers for Rectifier Systems

These are two-winding or three-winding transformers designed to power 6-pulse or 12-pulse rectifiers. Each transformer design takes into account the magnitude of current harmonics flowing through the windings and the resulting increased heat dissipation in the windings.

These transformers are most commonly manufactured using the non-vacuum RESIGLAS technology.

Resin Transformers for Rectifier Systems

Resin Transformers for Mining Stations

These are transformers designed for installation in flameproof enclosures and intended for operation in underground mines. They are characterized by very low height and low winding temperature rises—so that the allowable operating temperatures of the windings are not exceeded once enclosed. These transformers are designed to temperature class H – maximum winding temperature up to 180°C.

Basic Electrical Parameters:

Rated power in kVA: from 400 to 1600
Rated primary voltage in kV: 6.3
Rated secondary voltage in V: 525, 1050, 1200, 3300
No-load tap changer voltage regulation: ± 2 x 2.5%
Connection group: Dy5, Yy0
Short-circuit voltage: 4.5% or 6%
Temperature class H

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