1250 kVA Cast Resin Dry Type Transformer

1250 kVA Cast Resin Dry Type Transformer is prepared for indoor cast-resin transformer duty. It covers 10kV / 11kV / 13.8kV input networks and 400V / 415V / 480V output distribution. It uses AN (Base) / AF (+40% Capacity) cooling or thermal design data where specified. This series description presents the application, construction, protection, and specification details in finished product copy.

Engineered for Harsh Industrial Environments

For indoor cast-resin transformer duty, engineered for Harsh Industrial Environments is treated as a practical design and selection point rather than generic catalog wording.

• The 1250 kVA Dry Type Transformer is a heavy-duty power solution designed for manufacturing plants and processing facilities where air quality is often compromised by dust or humidity. In these settings, standard open-ventilated units often fail because conductive particles bridge the insulation gaps.
• To counter this, we categorize this unit as a fully encapsulated dry type transformer. The engineering logic is based on Surface Tracking Resistance. In environments rated as "Pollution Degree 3," airborne metal dust or chemical salts settle on the coils. On the units, the high-voltage conductors are buried deep inside a vacuum-cast resin cylinder with a high Comparative Tracking Index (CTI). This prevents the formation of carbonized conductive paths (electrical tracking) on the surface, allowing the unit to operate safely even when covered in a layer of factory grime.

Cast Coil Technology: Short-Circuit Stiffness

For indoor cast-resin transformer duty, cast Coil Technology: Short-Circuit Stiffness is treated as a practical design and selection point rather than generic catalog wording.

• At 1250 kVA, the electromagnetic forces generated during a downstream fault are violent enough to warp standard wire-wound coils. the cast coil dry type transformer addresses this through Monolithic Curing.
• Solid monolithic cast resin coil cylinder for 1250 kVA industrial.
• Mechanical Physics: The epoxy resin and fiberglass reinforcement are cured into a single, solid cylinder. This structure has a mechanical strength comparable to rigid plastic composites. It completely immobilizes the copper/aluminum turns, preventing the axial telescoping or radial buckling that typically destroys transformers during high-current faults.
• Maintenance Reality: For maintenance teams referring to this unit simply as a trafo dry type, the smooth resin surface simplifies cleaning. Unlike VPI coils that trap dust in crevices, this unit can be cleaned with compressed air or wiped down rapidly during short scheduled outages.

Cooling and Capacity Extension

Cooling and Capacity Extension provides selection data that helps compare ratings, voltage classes, and installation requirements.

• While the nameplate rating is 1250 kVA, industrial load profiles are rarely flat.
• AF Thermal Reserve: This dry type unit includes pre-installed mounting channels for cross-flow fans. By switching from natural convection to forced convection, we significantly increase the heat transfer coefficient of the coil surface. Practically, this unlocks a continuous overload capacity of 40% (approx. 1750 kVA). This "hidden" capacity allows the transformer to absorb the heavy inrush currents from large motor startups without triggering a high-temperature trip.

Technical Data Sheet

Technical Data Sheet provides selection data that helps compare ratings, voltage classes, and installation requirements.

• Technical Parameter.
• Specification Data.
• 10kV / 11kV / 13.8kV.
• 400V / 415V / 480V.
• Vacuum Cast Coil (Encapsulated).
• Environmental Class.

Typical Application Context

Typical Application Context connects the product rating with the field conditions, enclosure layout, and distribution role it is normally selected for.

• Encapsulated 1250 kVA dry type transformer powering dusty.
• Mining & Minerals: Powering crushers and conveyors where dust levels are high. The encapsulated coil prevents dust buildup from causing electrical tracking.
• Chemical Processing: Installed in corrosive atmospheres where the resin shield protects the copper from chemical attack.
• Heavy Manufacturing: Serving as the main step-down unit for automotive stamping lines, handling frequent high-current pulses.

Electrical and Mechanical Data

The table data is organized for quick rating comparison, project specification, and transformer selection.

Product Detail Images