Three-phase 3150kVA Cast Resin Dry-type Power Transformer

Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of three-phase 3150kva cast resin dry-type power transformer in China. If you're going to buy customized three-phase 3150kva cast resin dry-type power transformer made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

The three-phase 3150 kVA cast resin dry-type power transformer is an oil-free medium-power transformer whose windings are cast in epoxy resin, delivering efficient, safe and environmentally friendly power conversion for industrial plants, commercial complexes, infrastructure and public utilities. With AN/AF cooling, it can carry 120% of rated load under forced-air cooling, making it a flexible choice for installations with periodic peak demand.

Manufactured by GNEE Electric, the 3150 kVA resin-cast dry-type transformer features flame-retardant windings, low partial discharge (≤ 5 pC), low noise, high short-circuit withstand capability and a Class F insulation system (155 °C). Request a factory-direct quotation with full routine test reports.

What Is a 3150 kVA Cast Resin Dry-Type Transformer?

A cast resin dry-type transformer encases its windings in solid epoxy resin, replacing liquid insulation with a self-extinguishing solid insulation system:

• Safety and flame resistance – the cast-resin system is flame-retardant and self-extinguishing, qualifying the transformer for high-safety locations where oil-filled units are prohibited.
• Reduced maintenance – no oil sampling, treatment or leakage monitoring; installation is simpler and long-term operating cost is lower.
• Environmental performance – no transformer oil means no leakage risk and no end-of-life oil disposal liability.
• Efficient operation – low loss and low noise design, with 120% rated capacity available under forced-air (AF) cooling.
• High reliability – high mechanical strength, strong short-circuit withstand, low partial discharge and good thermal stability ensure a long service life.

3150 kVA Cast Resin Dry-Type Transformer Specifications

Operating Checks and Maintenance of Dry-Type Transformers

To ensure stable long-term operation, perform the following checks regularly (adapted for dry-type construction):

1. Winding temperature monitoring – track winding hot-spot temperature via the temperature controller; alarm and trip settings typically correspond to the Class F insulation limit (155 °C). Fans should start automatically at the preset winding temperature.
2. Load measurement – measure load current during each season's peak period with a clamp ammeter. For continuous economy of operation, keep the load within 70–80% of rated capacity; sustained operation above this range accelerates insulation aging.
3. Voltage measurement – keep secondary voltage within ±5% of the rated value; use the off-circuit taps to correct sustained deviation (tap adjustment only with the transformer de-energized).
4. Insulation resistance measurement – measure insulation resistance periodically with the transformer de-energized using a 2500 V megohmmeter for HV windings and 500 V for LV windings; the reading should not fall below 70% of the previous measurement. Record values in a trend log.
5. Visual and cleaning checks – inspect for dust accumulation on windings (clean with dry compressed air), cracked resin surfaces, loose connections and abnormal noise.

Applications of the 3150 kVA Dry-Type Power Transformer

• Industrial manufacturing plants and process industries
• Commercial complexes, hotels, hospitals and airports
• Data centers and IT facilities
• Power distribution for public utilities and infrastructure
• Renewable energy plants and EV charging hubs
• Buildings and sites with strict fire-protection requirements

Why Choose GNEE electric?

• Advanced manufacturing – automatic winding lines, vacuum casting equipment and a modern dry-type transformer workshop.
• Full testing capability – routine tests per IEC 60076 including partial discharge measurement on every unit; type tests available.
• International certifications – ISO 9001 / ISO 14001 / ISO 45001 systems; CE and third-party inspection for export projects.
• Global delivery – products supplied to more than 50 countries and regions.
• Engineering support – pre-sales technical consulting, drawing review, installation guidance and 7×24 after-sales response.

Send your rated capacity, voltage ratio, vector group, enclosure and site conditions - GNEE's engineering team will confirm the technical solution and provide a factory-direct quotation with test plans and lead time within 24 hours.

Contact GNEE Electric now for your 3150 kVA cast resin transformer project.

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FAQ

Q1: What does "cast resin" mean in a dry-type transformer?

A: It means the windings are encapsulated in epoxy resin cast under vacuum. The solid insulation replaces liquid oil, giving the transformer flame-retardant, self-extinguishing characteristics and eliminating oil leakage and maintenance.

Q2: How can the 3150 kVA cast resin transformer carry 120% load?

A: With the optional forced-air (AF) cooling system, fans blow filtered air across the windings, increasing heat removal so the transformer can continuously carry approximately 120% of its AN-rated (natural-air) capacity.

Q3: What insulation class and temperature rise apply?

A: Standard is Class F insulation (155 °C limit) with average winding temperature rise ≤ 100 K per IEC 60076-11. Class H is available for extra thermal margin.

Q4: Which enclosure protection ratings are available?

A: IP00 (open, for dedicated rooms), IP20 (standard indoor enclosure) and IP23 (outdoor or dusty environments). Higher/custom ratings are available on request.

Q5: Is the transformer suitable for outdoor installation?

A: Yes, with an IP23 enclosure or higher and appropriate site protection against direct sun, heavy pollution and flooding. Confirm site conditions at quotation stage.

Q6: What maintenance does a cast resin dry-type transformer need?

A: Only reduced maintenance: periodic cleaning of dust from windings, insulation-resistance measurement, connection checks and temperature-controller verification. No oil sampling or treatment is required.

Q7: What tests are performed before delivery?

A: Routine tests per IEC 60076 include winding resistance, voltage ratio and vector group, no-load and load loss, partial discharge (≤ 5 pC), separate-source and induced overvoltage withstand tests. Type-test reports are available on request.

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