Three Phase Open Dry Type Transformer 2500kVA 10kv/0.4kv Traction Eco Friendly IP20

Three Phase Open Dry Type Transformer 2500kVA 10kV/0.4kV Traction Eco Friendly IP20

Brief Description
This epoxy resin cast dry-type transformer uses high-quality silicon steel core and copper windings, encapsulated with epoxy resin under vacuum casting. It has no insulating oil, featuring flame retardant, explosion-proof, low partial discharge, low noise and minimal maintenance. Ideal for indoor power distribution, high-rise buildings, hospitals, data centers, subway, photovoltaic and wind power stations. Suitable for environments with strict fire safety & environmental requirements.

Epoxy Resin Cast Coil: Vacuum cast epoxy resin encapsulates copper winding, high mechanical strength, anti-short circuit capability.
Silicon Steel Laminated Core: Low loss cold rolled silicon steel sheet, optimized core structure to reduce noise & no-load loss.

Cooling Fan: Forced air cooling to improve overload capacity.

Temperature Controller: Real-time winding temperature monitoring, alarm and trip protection.

Mounting Base & Bracket: Heavy-duty steel base for stable installation.

Enclosure (Optional IP20/IP30): Prevent accidental touch and dust ingress.

Application Scenarios

1.Commercial & residential high-rise buildings
2.Hospitals, schools, public facilities
3.Data centers
4.Metro / tunnel projects
5.Solar & wind renewable power plants
6.Industrial workshops

Product Advantages

1. Fire Safety – IEC 60076-11 Class F1
Epoxy resin self-extinguishes instantly. No oil – ideal for hospitals, subways, data centers, and high-rises.
2. Zero Maintenance & Low Operating Cost
No oil checks, pits, or separate rooms required. Lower total cost than oil-immersed units.
3. Energy Efficiency – GB 20052-2024 Grade 1
~30% lower no-load losses vs. SCB12. Operating noise: 45-52 dB(A).
4. Short-Circuit Withstand
Vacuum casting and full-oblique core joints provide up to 8% impedance withstand.
5. Partial Discharge < 5 pC
Vacuum casting eliminates voids, achieving <5 pC PD for decades of reliable insulation.
6. Compact & Environmentally Friendly
30-50% smaller footprint. No contamination risk. Installable at load centers. Fully recyclable.

Production Process

Winding Fabrication Low-voltage and high-voltage windings are wound by automatic winding machine; insulation strips are placed between layers.

Winding Curing (Epoxy Casting for Resin Dry Type) Windings are placed in moulds, vacuum poured with epoxy resin and cured at constant temperature.

Winding Demoulding & Finishing Finished windings are demoulded, trimmed and inspected for surface defects.

Core & Winding Assembly The core and high/low voltage windings are assembled together; supporting insulators and connection bars are installed.

Wiring & Accessories Installation Internal wiring, terminal blocks, temperature sensors, fans and enclosure parts are mounted.

Electrical Performance Test Conduct routine tests: resistance measurement, ratio test, insulation resistance, partial discharge, withstand voltage test.

Enclosure Assembly & IP Protection Check Install metal enclosure, check IP protection level as required (e.g. IP54).

Final Inspection & Packing Overall visual and functional recheck; qualified products are cleaned and packed for shipment.

Technical Specifications – SCB12-800/10 Dry-Type Transformer

No.	Parameter	Specification
1	Energy Efficiency Class	SCB12
2	Rated Capacity	800 kVA
3	Rated Voltage (HV/LV)	10 kV / 0.4 kV
4	Rated Current (HV/LV)	46.19 A / 1154.7 A
5	Voltage Ratio	10 ± 2 × 2.5% / 0.4 kV
6	Short-Circuit Impedance	6%
7	Vector Group	Dyn11
8	Rated Frequency	50 Hz
9	Insulation Class	Class F
10	Temperature Rise Limit	100 K
11	Rated Insulation Level	35/5 kV
12	Lightning Impulse Withstand Voltage (HV Side)	75 kV
13	Power Frequency Withstand Voltage (HV Side)	35 kV / 60 s
14	Power Frequency Withstand Voltage (LV Side)	5 kV / 60 s
15	Power Frequency Withstand Voltage (Neutral Point)	5 kV / 60 s
16	No-Load Loss	1.215 kW
17	Load Loss	6.96 kW
18	No-Load Current	0.70%
19	Efficiency	≥99%
20	Partial Discharge Level	<10 pC
21	Noise Level	≤60 dB

Product Range:

• Epoxy resin cast dry-type transformers (≤35 kV)

• Oil-immersed transformers

• Photovoltaic boost transformers

• YB12 box-type substations

• Intelligent high/low-voltage switchgear

• Prefabricated box transformers for EV charging

• Smart charging piles

• Distributed photovoltaic products

Certificates and Test Reports

Our dry type transformers comply with IEC60076 & GB/T10228, with ISO9001, ISO14001, ISO45001 and CE certifications. Complete type test report and IP protection certificate are available. Each unit undergoes strict factory tests before shipment.

Global market case
EV Gigafactory, Shangha

Deployed across renewable energy plants, urban distribution networks, industrial facilities, commercial buildings, and critical infrastructure.

Oil-Immersed Transformers – Indonesia

Export Power Distribution
S13/S20 series oil-immersed distribution transformers supplied for Indonesian grid and industrial networks.
Dry-Type Transformers – Australia
Export Commercial building

SCB14/SCB18 series cast-resin dry-type transformers, 11/22 kV class, supplied to Australian commercial and data-center networks. Fire-safe, maintenance-free, engineered to AS/NZS 60076.

Total Quality Management (TQM)

ISO 9001, ISO 14001, OHSAS 45001 certified. Full-chain quality control from material to delivery.

A. Incoming Quality Control (IQC)
All raw materials undergo full testing before production. Non-conforming materials rejected.

B. In-Process Quality Control (IPQC)
10+ QC inspections: core stacking, excitation, winding resistance, insulation, partial discharge, dimensional checks.

C. Final Quality Control (FQC)
Every unit 100% tested before shipment:

Routine Tests (IEC 60076-11):
• Winding resistance
• Voltage ratio & vector group
• No-load loss & current
• Load loss & short-circuit impedance
• Insulation resistance
• Applied voltage (hi-pot)
• Induced voltage
• Partial discharge (<5 pC)

Type Tests (on request):
• Temperature rise
• Lightning impulse (95 kV)
• Short-circuit withstand
• Acoustic noise

Special Tests:
• Zero-sequence impedance
• No-load current harmonic analysis

D. Certifications
• ISO 9001
• ISO 14001
• ISO 45001
•CE
• IEC 60076

Transportation

Shipping Methods:
• Sea (FCL/LCL) via major Chinese ports: 15-45 days.
• Rail: China-Europe Railway Express: 15-20 days.
• Road: Regional deliveries.
• Air: For urgent small shipments.
Trade Terms:
EXW, FOB, CIF,
Lead Time:
• 30-630 kVA: 20-30 days.
• 800-2,500 kVA: 35-45 days.

1.Q: What is a dry-type transformer?

A: A dry-type transformer is a power transformer that uses air as the main cooling medium instead of insulating oil, with its windings encapsulated in epoxy resin or insulated by solid materials.

2.Q: What is the biggest difference between dry-type transformers and oil-immersed transformers?

A: The core difference is the cooling and insulating medium. Dry-type transformers adopt air cooling and solid insulation, while oil-immersed transformers rely on insulating oil for heat dissipation and insulation.

3.Q: What are the main types of dry-type transformers?

A: The most widely used types are epoxy resin cast dry-type transformers and vacuum pressure impregnated dry-type transformers, and the former is more common in urban power distribution systems.

4.Q: What are the key advantages of dry-type transformers?

A: Dry-type transformers have outstanding advantages such as fire resistance, explosion proof, low noise, environmental friendliness, low maintenance and safe operation, and they will not cause oil leakage pollution.

5.Q: Where are dry-type transformers mainly applied?

A: They are widely used in densely populated areas, indoor power distribution rooms, high-rise buildings, hospitals, subway stations, industrial workshops and other places with high fire safety requirements.

6.Q: How is a dry-type transformer cooled?

A: It has two main cooling modes: natural air cooling (AN) and forced air cooling (AF). Natural cooling relies on natural air convection, while forced cooling uses fans to accelerate heat dissipation.

7.Q: What is the insulation class of most dry-type transformers?

A: Most mainstream dry-type transformers adopt F-class or H-class insulation. F-class insulation allows a maximum temperature rise of 105K, and H-class insulation has better high-temperature resistance.

8.Q: What routine maintenance does a dry-type transformer need?

A: Regular maintenance includes cleaning dust on windings and radiators, checking the tightness of wiring terminals, testing insulation resistance, and monitoring operating temperature and noise.

9.Q: What are the main performance parameters of a dry-type transformer?

A: The key parameters include rated capacity, rated voltage, rated current, impedance voltage, no-load loss, load loss, temperature rise and insulation level.

10.Q: Why are dry-type transformers more environmentally friendly than oil-immersed ones?

A: Because dry-type transformers have no insulating oil, they avoid oil leakage, soil and air pollution risks. Meanwhile, their materials are non-toxic and recyclable, with low electromagnetic pollution.

Packaging
1. Transformers Package
Packed in solid plywood wooden cases. The crates are reinforced with timber frames, equipped with bottom skids for forklift handling. Internal moisture-proof and shockproof protection is applied to safeguard electrical parts during sea & land transit.
2. Large Prefabricated substation / Complete Substation package
No wooden box packing. The whole unit is fixed and secured on flatbed trucks with tension straps. We adopt professional heavy-load binding scheme, and take protective measures on exposed fittings. Direct shipment as an integrated module to cut re-assembly work for clients.
All packages comply with export shipping standards, suitable for ocean freight, land transportation and multi-modal transport.