35kV Class Epoxy Resin Cast-Resin Dry-Type Transformer SC(Z)B Series 50~10000kVA

35kV Class Epoxy Resin Cast-Resin Dry-Type Transformer

The 35kV class epoxy cast-resin dry-type transformer is a new generation of high-voltage dry-type distribution product, manufactured with vacuum epoxy-resin casting technology and a premium silicon-steel core. It is widely used in urban power grids, high-rise buildings, airports, metros, tunnels, petrochemical plants and industrial substations — power supply systems with high requirements for fire safety, environmental protection and reliability. With a rational structure and elegant appearance, it offers excellent moisture resistance, flame retardancy, zero pollution, low partial discharge, easy maintenance and good heat dissipation, running maintenance-free under normal conditions at a low total cost of ownership.

Product Overview

Both HV and LV windings are vacuum-cast in epoxy resin and cured into a rigid, void-free insulation structure. The core is built from premium cold-rolled grain-oriented silicon steel sheets with fully-mitred joints for low no-load loss, low no-load current and low noise. Being oil-free, the transformer carries no risk of fire or explosion and requires no oil treatment. It can be installed close to the load center, making it an ideal choice for urban network and industrial distribution systems at 35kV and below.

Construction Features

• Windings: LV winding wound with copper foil, interlayer insulation in Class F material; HV winding wound with premium insulated wire and vacuum-cast in epoxy resin — high mechanical strength, stable electrical performance, low partial discharge;
• Core: High-permeability cold-rolled grain-oriented silicon steel, fully-mitred joints with unwound upper yoke — low no-load loss, small magnetizing current, low noise; surface coated with resin paint for moisture and rust protection;
• Cooling: AN (natural air cooling) / AF (forced air cooling) optional. AN supports continuous long-term operation; with AF kit the output capacity increases by approx. 40%~50% for peak-load and emergency overload conditions;
• Enclosure: IP00 (bare) as standard; IP20 / IP30 enclosures available for different environments; temperature display and control device monitors three-phase winding temperature and automatically starts/stops fans;
• Termination: HV side can be equipped with cable boxes, bushings or busbars as required; LV side offers flexible busbar / side-exit options for bay-by-bay connection with switchgear.

Main Performance Advantages

• Fire-safe and pollution-free — can be installed directly at load centers and in crowded places;
• Maintenance-free / low-maintenance, simple installation, no oil treatment or leakage checks — low total operating cost;
• Excellent moisture resistance — no pre-drying needed before re-energizing after shutdown, suitable for humid environments with large temperature variations;
• Low loss, high efficiency, low partial discharge, good heat dissipation, strong overload capability and high reliability;
• Compact and lightweight — small footprint, low installation cost, can be bay-arranged with MV/LV switchgear;
• Strong environmental adaptability — moisture-proof and temperature-change resistant, reliable under harsh operating conditions;
• Outstanding eco-performance: oil-free, pollution-free, low noise; the resin material is recyclable at end of life without special disposal.

Main Technical Parameters (Standard)

Service Conditions

• Ambient temperature: max. +40℃, min. -25℃;
• Altitude: ≤ 1000 m; special insulation design available for high-altitude sites;
• Relative humidity ≤ 95%; free from explosive or corrosive gases and heavy dust (customizable for special environments).

Standards Compliance

IEC 60076-11GB 1094.11GB/T 10228JB/T 3837

Applications

Urban power networks and industrial substations, metro and high-speed rail, airports, ports, petrochemical plants and high-rise buildings — power supply systems demanding high fire safety, environmental protection and reliability.

Note: The above data are typical standard configurations; actual products are subject to factory technical documents.

Contact us for a quotation and customized solution.