SINTRA

SINTRA’s cast-resin (dry-type) transformer is highly recommended for various industrial applications due to its excellent performance and cost economics

The primary and secondary windings are encapsulated in epoxy resin and the transformer relies on natural air convection for heat dissipation

This compact design provides many safety, economical, and environmental advantages without compromising the electrical and mechanical integrity of conventional oil-cooled transformers. Without the typical fire hazard, CRTs can be placed near the load center.

Product Structure

Three Limb Core: Grain-oriented, low-loss silicon steel sheets.Surface paint is resilient to adverse ambient conditions
Low Voltage Winding: Foil-type. Turns are tightly bounded together by high quality insulating material
High Voltage Winding: Vacuum-potted single foil-type by cast-resin
Low Voltage Terminal
High Voltage Terminals: Variable arrangement. HV taps for voltage adjustment. Adjustable in no-load state
Core Clamp: High accuracy, laser-machined steel plate. Rollers can be installed for bi-directional movement upon request
Insulation Cylinder: enhances heat dissipation by natural heat convection (no cooling fans)
Spacers: to eliminate mechanical vibrations between winding and core and to ensure low noise emissions

Product Features

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Step-Lap Lamination

Grain-oriented, low-loss silicon steel sheets, cut by high accuracy machine

Low Voltage Windings

Wound from Al or Cu foil with interleaved DMD. Ovened to form uniformly bonded solid cylinders. High moisture resistance and dynamic stability under short-circuit conditions

High Voltage Windings

Wound from Al or Cu foil. Coils are placed in a heated mold and potted in a vacuum furnace with specially blended epoxy resin. Foil winding design is simple and safe. The interlayer voltage is equal to interturn voltage, giving winding a higher AC voltage and impulse voltage withstand capacity

Vacuum Casting

Windings are casted in automatic vacuum casting machine. Accurate control of resin component proportion and vacuum degree

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Enclosures

CRTs can be installed indoors or within a metal enclosure (protection class IP20 or IP21) to protect the winding surfaces and terminals

‍Overload Capacity:

With additional cooling fans installed, SINTRA’s CRTs can be overloaded up to 40% for an extended period of time

Fire Safety

SINTRA CRTs use flame-retardant and self-extinguishing materials, thus internal arcing / electrical faults or external flames will not cause the CRTs to burn. This allows for installation near load centers:populated buildings...etc

Connection Types

Plug-type elbow connectors can be supplied on HV side for lightning impulse up to 125 kV. Recommended connections are shown:

Cast-Resin Transformer

SINTRA’s cast-resin (dry-type) transformer is highly recommended for various industrial applications due to its excellent performance and cost economics

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