Three Phase Epoxy Resin Dry Type Earthing 250kVA 400V Class F Transformer

Product Description

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.

three Phase Epoxy Resin Dry Type Earthing 250kVA 400V Class F Transformer

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
Raw material inspection → Silicon steel core cutting & stacking → LV & HV winding → Vacuum epoxy casting / VPI impregnation →

Curing & finishing → Core-coil assembly → Pre-electrical test → Enclosure & accessory installation → Routine performance test → Final inspection & packing

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

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 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.

Q: What are the main advantages of dry-type transformers compared with oil-immersed transformers?

A: Dry-type transformers use resin insulation instead of oil. They feature fire resistance, low pollution, simple maintenance, compact structure and can be installed indoors, which is suitable for commercial buildings, data centers and high safety requirement sites.

Q: Can the winding material be copper or aluminum? What is the difference?

A: Both copper and aluminum windings are optional. Copper winding has lower resistance, less loss and better heat dissipation, with higher cost. Aluminum winding is more cost-effective and lighter, but its winding size will be larger under the same performance.

Q: What is the typical efficiency and loss level of your dry-type transformer?

A: Efficiency and losses depend on capacity and design. Normally it can meet IE2/IE3 energy standard. We will provide exact no-load loss and load loss data according to your technical specification.

Q: What test items will be carried out before delivery?

A: Routine tests include transformation ratio test, winding resistance test, insulation resistance test, induced voltage test, partial discharge test. Temperature rise test and noise test are type tests for samples.

Q: Is the secondary winding customizable for multi-group and phase-shift structure?

A: Yes. We can design multi-group secondary windings with phase shift as requested, such as 3 major groups, 6 minor groups and 10° phase shift between minor groups. Please provide your target no-load voltage.

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

A: Common insulation classes are F class and H class. F class allows maximum winding temperature rise of 100K; H class allows 125K. H class has better high-temperature resistance.

Q: Do you supply the metal enclosure, cooling fans and temperature control system together?

A: Yes. Enclosure (IP20 / IP30), axial cooling fans and temperature controller can be supplied as optional accessories according to customer requirements.

Q: What information do you need from buyers for quotation? A: Rated capacity, primary & secondary voltage, winding material, impedance voltage, insulation class, enclosure IP grade, special winding structure, ambient condition and applicable standard. The transformer nameplate is also helpful.

Q: What is the warranty period?

A: The standard warranty is 12 months after shipment or 18 months from factory delivery, whichever comes first. Damage caused by improper installation or operation is excluded.

Q: What standards does your dry-type transformer comply with?

A: Our dry-type transformers are manufactured in accordance with IEC 60076, also can meet GB, ANSI or other regional standards upon request.

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.