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Cast Resin Transformers

Jiangsu Tianli Electromechanical Co.,Ltd: Your Professional Cast Resin Transformers Manufacturer!

Our company is a high-tech enterprise specializing in the research and development, production, and sales of transformers and switchgears. It originated from the Haian Transformer Factory established in 1978. As one of the pioneers in the transformer manufacturing industry in China, we have accumulated extensive industry experience and technical expertise, and we have been honored with the title of one of the first "China Famous-Brand Products" in the transformer industry.

10KV Series Cast Resin Dry Type Transformer
The 10kV series resin-cast dry-type transformers are high-efficiency power equipment specifically designed for medium-voltage distribution systems. Utilizing advanced vacuum resin-casting...
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VPI Dry-type Transformer
VPI dry-type transformers are designed with H and C class series materials such as Nomex®, Cequin, and Tufquin produced by companies like DuPont Quin-T, which have been certified by the...
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35kV On-load Dry-type Transformer
Technical Highlights: The 35kV on-load tap-changing dry-type transformer features an advanced design with exceptional insulation performance. Utilizing vacuum drying technology for both the core...
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35KV Series Cast Resin Dry Type Transformer
The 35kV resin-cast dry-type transformer series represents a critical component in modern power distribution systems. Utilizing advanced epoxy resin insulation technology, this transformer series...
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20KV Series Cast Resin Dry Type Transformer
The 20kV resin-cast dry-type transformer series represents advanced power distribution technology, specifically engineered for reliable electricity transmission and distribution in modern grid...
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Why choose us?

Global competitive pricing

Breaking the bias that "high quality must come at a high price," we make cutting-edge electromechanical equipment accessible. Leveraging 39 years of local supply chain expertise and a global logistics network, we reduce overall costs by over 30%. Our tiered pricing model ensures economies of scale—orders as small as 100 units enjoy a 10% price drop per unit. Transparent cost breakdowns detail raw materials, process premiums, and certification fees, eliminating hidden markups.

Zero-risk manufacturing

End-to-end risk control from blueprint to delivery ensures your success. First-article inspection locks in standards, guaranteeing consistency before mass production. Payment is phased for security: 30% deposit to start → 70% upon shipment → 100% after acceptance. Double warranty coverage: 24-month extended protection, surpassing the industry's standard 12 months.

Elite engineering & rapid customization

Our veteran R&D team brings 30+ years of power-electrical design expertise, backed by 50+ patents and technical collaboration with Shanghai Electric Power Research Institute (top-tier in China). Custom electromagnetic solutions delivered within 72 hours of request.

Reliable product quality

Every unit undergoes 100% testing under our comprehensive quality management system. Specialized products endure 72-hour salt spray tests, shock/vibration resistance, stable operation from -40°C to 55°C, and 95% RH humidity tolerance. Proven reliability: 10-year zero-failure record on South China Sea oil rigs.

Benefits of Cast Resin Transformers

Extremly reduced fire risk

Cast resin mounting materials are less inflammable and can be defined as self-extinguishing. There is no need of special fire protection coatings. When engulfed in flames the heat given off from the cast resin is reduced and harmful gasses are decreased. These advantages make cast resin transformers a perfect choice for installations inside hospitals, public buildings, airports, subways, mines, oil rigs, nuclear power plants, ships, etc.

Reduced maintenance costs

Cast resin transformers are designed to withstand the worst climatic and environmental conditions. Preventive maintenance consists of a few simple checks and basic cleaning.

Versatility and performances

Cast resin transformers can cope well with overloads found in most typical installations.

Low operation costs

The low losses in the magnetic core and in the windings can reduce the costs of operation and ownership.

High short-time overload capability

Current density in the windings of cast resin transformers is considerably lower than in those of oil-immersed transformers. Short-time load peaks, such as with wind power installations, can be easily overcome without there being a need to plan the relevant oversizing

Environment freindly

Cast resin transformers are exclusively air cooled. There are no liquid collants of chemical type, which could be releast into the environment. There is therefore less maintenance of cast resin transformers, compared to oil filled types. Cast resin transformers are the best solution in case of installation in water protection areas and parks.

Product Parameters

Capacity	Rated Voltage &Off-load tapping			Vector GroupSymbol	Tier 1		Tier 2		Tier 3		No-load Current	Short Circuit Impedance
Capacity	H.V (kV)	High Pressure Tap Range	L.V(kV)	Vector GroupSymbol	No-load loss (W)	Load loss (W)	No-load loss (W)	Load loss (W)	No-load loss (W)	Load loss (W)	No-load Current	Short Circuit Impedance
30	11 10.5 10 6.6 6.3 6	±5% ±2.5%	0.4 0.69	Dyn11 Yyn0	105	640	130	640	150	710	2	4
50					155	900	185	900	215	1000	2	4
80					210	1240	250	1240	295	1380	1.5	4
100					230	1415	270	1415	320	1570	1.5	4
125					270	1665	320	1665	375	1850	1.3	4
160					310	1915	365	1915	430	2130	1.3	4
200		±5% ±2×2.5%			360	2275	420	2275	495	2530	1.1	4
250					415	2485	490	2485	575	2760	1.1	4
315					510	3125	600	3125	705	3470	1	4
400					570	3590	665	3590	785	3990	1	4
500					670	4390	790	4390	930	4880	1	4
630					775	5290	910	5290	1070	5880	0.85	4
630					750	5365	885	5365	1040	5960	0.85	4
800					875	6265	1035	6265	1215	6960	0.85	6
1000					1020	7315	1205	7315	1415	8130	0.85
1250					1205	8720	1420	8720	1670	9690	0.85	6
1600					1415	10555	1665	10555	1960	11730	0.85	6
2000					1760	13005	2075	13005	2440	14450	0.7	6
2500					2080	15445	2450	15445	2880	17170	0.7	6

Application of Cast Resin Transformers

Urban infrastructure

Used in subway stations and airports where fire safety and space efficiency are critical. Their sealed design prevents leaks and reduces fire risks.

Commercial buildings

Employed in high-rise offices and shopping malls for reliable power distribution with minimal maintenance needs.

Industrial facilities

Applied in factories and manufacturing plants where high power loads and safety standards are essential. They support continuous operations without oil-related hazards.

Renewable energy projects

Utilized in solar and wind farms to step up voltage levels safely and efficiently, ensuring stable energy transmission.

How to Cooperate With Us

The first and most important step is that you contact us. Our process begins the minute you call or email Pacific Transformer.

RFQ

Whether you request a quote for a new product design or an existing part, you should have a price in 48 hours.

Prototype

After you receive your pricing the prototyping process begins. This generally takes two weeks or less.

Production

Once we receive approval of the prototypes, the production turnaround time should be two weeks.

Manufacturing

Our ISO 9000 certified process is central to all manufacturing operations. All our products are made using our UL listed insulation system.

Packaging and Shipping

productcate-1000-826

FAQ

Q: How is a cast resin transformer constructed?

A: The construction involves securing the transformer's magnetic core and windings within a mold. A mixture of epoxy resin, sometimes combined with fillers like quartz powder for added strength and thermal conductivity, is then vacuum-cast into the mold to completely encapsulate the components. After the casting, the resin is cured to form a solid, robust structure.

Q: How does cooling work in a cast resin transformer?

A: Cast resin transformers are air-cooled. The cooling can be achieved either by natural air convection (AN) or, in high-load applications, with forced air cooling (AF) using fans. The design often includes ventilation ducts to allow for the effective dissipation of heat generated during operation.

Q: Can cast resin transformers be used outdoors?

A: Yes, cast resin transformers can be used in outdoor locations, but they must be housed in a waterproof and moisture-proof enclosure. Because the encapsulated design is inherently resistant to moisture, they are well-suited for humid or coastal environments when adequately protected from the elements.

Q: What are the key safety features of cast resin transformers?

A: Key safety features include their non-flammable, self-extinguishing insulation system, which poses minimal fire risk and produces very little toxic smoke in the event of a fire. They also eliminate the risk of oil leaks, which can be an environmental and safety hazard. This makes them safe for use in populated areas.

Q: How does a cast resin transformer compare to an oil-filled transformer?

A: Cast resin transformers are a type of dry transformer that uses solid resin insulation and air cooling, while oil-filled transformers use flammable mineral oil for both insulation and cooling. This results in key differences: cast resin transformers are safer in terms of fire risk and more environmentally friendly, but they have a higher initial cost and potential cooling limitations in very hot environments compared to oil-filled units.

As one of the leading cast resin transformers enterprises in China, we warmly welcome you to buy high quality cast resin transformers for sale here from our factory. Good service and reasonable price are available.

20KV Series Cast Resin Dry Type Transformer, 35KV Series Cast Resin Dry Type Transformer, VPI Dry type Transformer