Cast Resin Dry Type Transformer

Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of cast resin dry type transformer in China. If you're going to wholesale durable cast resin dry type transformer made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.

This 500kVACast Resin Dry Type Transformer was delivered to China in 2023 with delta star connection. The rated capacity of the dry type transformer is 500kVA, the primary voltage is 10 KV and secondary voltage is 0.4KV

When your project calls for reliable power distribution without the risks of oil-filled equipment, a cast resin dry type transformer delivers exactly what modern infrastructure needs. Cast resin technology provides excellent insulation and environmental protection, this together with the foil winding technology inside the resin offers the ultimate dry type transformer in terms of dielectric performance and short circuit withstand ability and ensures long term reliability for both distribution and special applications. At our manufacturing facility, we have spent years refining the epoxy resin casting process to produce transformers that handle the heat, dust, and electrical stress of real-world industrial sites.

Unlike oil-immersed units, cast resin dry type transformers rely on air-cooled insulation - no flammable liquid means no leakage, no fire containment pits, and dramatically simpler civil engineering around the installation area. The windings are fully encapsulated in high-grade epoxy resin under vacuum conditions, creating a solid, moisture-proof barrier that keeps conductive dust and humidity away from live parts. That matters more than you might think in coastal plants, chemical facilities, or underground substations where corrosion is a silent killer of electrical equipment.

Our customers install these Cast Resin Dry Type Transformers in places where safety regulations are strict and downtime is expensive:

• Data centers - no oil means no fire suppression system upgrades
• Hospitals and medical complexes - clean, quiet operation near patient areas
• Shopping malls and high-rise buildings - compact footprint fits tight electrical rooms
• Renewable energy substations - handling solar and wind farm collection voltages
• Railway and metro power distribution - vibration-resistant cast windings
• Offshore platforms - salt air and humidity are blocked by the resin shell

We regularly supply ratings from 50 kVA up to 4,500 kVA at primary voltages reaching 36 kV, with secondary configurations at 0.4 kV or customized to your grid. Cooling is handled through natural air (AN) or forced air (AF) with thermostatically controlled fans that kick in when winding temperature climbs. The overload capacity under AF cooling typically rises by 50%, giving you headroom for temporary load spikes without oversizing the unit.Cast Resin Dry Type Transformer can be supplied with either aluminum or copper windings together with possibility of class F or class H insulation system, they can be designed to in-door or out-door installation with different enclosures.

We build these units as a transformer manufacturer, not a reseller. Every core is assembled from grain-oriented cold-rolled silicon steel using a 45° five-step overlapping method to cut no-load losses. The high-voltage windings are wound with insulated copper wire reinforced with fiberglass, then cast under vacuum in precision molding equipment. This process pushes partial discharge down to remarkably low levels - for 10 kV products, we routinely achieve readings below 5 pC, which translates to longer insulation life and fewer unexpected outages.

The low-voltage side uses foil conductors for units above 400 kVA. This design balances ampere-turns more evenly across the coil, reducing stray flux and improving the transformer's ability to ride through short-circuit events without mechanical damage. We have seen too many projects where a transformer fails not from normal load, but from a single fault event that warps windings in lesser designs. Our casting process prevents that.

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