5000 kVA Cast Resin Dry Type Transformer

5000 kVA Cast Resin Dry Type Transformer is prepared for indoor cast-resin transformer duty. It covers 33kV / 35kV (Sub-transmission) input networks and 6.6kV / 10kV / 11kV (Distribution) 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.

The MV-to-MV Urban Power Hub

For indoor cast-resin transformer duty, the MV-to-MV Urban Power Hub is treated as a practical design and selection point rather than generic catalog wording.

• The 5000 kVA Dry Type Transformer is a massive power node, serving as the central heartbeat for urban substations and large industrial complexes. At this 5 MVA capacity, the unit typically moves beyond simple end-user distribution, acting instead as a bridge between the sub-transmission grid and the local distribution network.
• This unit is most commonly deployed in a Sub-Transmission Configuration.
• Primary Side: Engineered as a 35kv dry type transformer, it accepts high-voltage inputs (33kV or 35kV) directly from the utility grid.
• Secondary Side: Instead of low voltage, it steps down to a medium-voltage level, functioning as an 11kv dry type transformer (or 6.6kV/10kV). This output feeds downstream Ring Main Units (RMUs) or distributed substation loops.
• The Benefit: This architecture allows facility planners to create a 100% oil-free MV-to-MV power network, strictly complying with fire safety regulations for indoor or underground city infrastructure.

Winding Engineering: Stress Control

For indoor cast-resin transformer duty, winding Engineering: Stress Control is treated as a practical design and selection point rather than generic catalog wording.

• At 5000 kVA, the electromechanical forces inside the coil during a fault are immense. The structural integrity of the dry type transformer winding is the primary determinant of asset life.
• HV Disc Architecture: For voltage classes above 3kV, we abandon simple layering in favor of Continuous Disc Windings. This geometry creates a high series capacitance, which evenly distributes the electrical stress of transient overvoltages (like lightning strikes) across the entire coil, preventing insulation failure at the line terminals.
• Foil LV Winding: To handle the massive current, the Low Voltage winding is constructed using full-width copper or aluminum foil. This eliminates the helical angle found in wire windings, effectively neutralizing the axial short-circuit forces that would otherwise attempt to telescope the coil during a grid fault.

Core Stability and Magnetic Flux

For indoor cast-resin transformer duty, core Stability and Magnetic Flux is treated as a practical design and selection point rather than generic catalog wording.

• The foundation of this 15-ton unit is its magnetic circuit. As a premium dry core transformer, the design uses High-Permeability Grain Oriented (H-GO) silicon steel.
• Vibration Dampening: A 5 MVA core generates significant magnetostriction forces. To preventing loosening over decades of operation, the core limbs are bound with resin-impregnated fiberglass tape, and the yokes are clamped by non-magnetic steel pull-plates.
• Step-Lap Miter: The laminations are cut at 45° angles and stacked in a 7-step lap pattern. This precision joint reduces no-load current and minimizes stray flux losses, ensuring the core remains cool even without the aid of liquid cooling.

Technical Data Sheet

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

• Technical Parameter.
• Specification Data.
• 33kV / 35kV (Sub-transmission).
• 6kV / 10kV / 11kV (Distribution).
• BIL (Impulse Level).
• 170 kV (Standard for 35kV 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.

• 5000 kVA dry type transformer installed in an underground metro.
• Substation powering traction systems.
• Metro & Tunnel Systems: Stepping down 35kV city power to 10kV for traction rectifiers, where fire load must be zero.
• Data Center Campuses: Serving as the primary on-site substation (33kV/11kV), feeding multiple downstream transformer blocks.
• Petrochemical Refineries: Powering large 6.6kV or 11kV compressors in Zone 2 hazardous areas where oil-filled transformers are a safety liability.

Electrical and Mechanical Data

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

Product Detail Images