• Product advantages
• Product parameters
• Ordering instructions

Product advantages

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Why Choose Our 10kV Three-phase Epoxy Cast Dry Distribution Transformer？

Leading Technology

• High pressure copper tape winding – Flame retardant formula, vacuum pouring

• Low pressure copper foil winding – Thermosetting epoxy prepreg cloth insulation

• High quality iron core – 45° full oblique joint step laminated structure
 

The Iron Core

• Made of cold rolled grain oriented silicon steel sheet with mineral oxide insulation

• Precision cutting and stacking minimizes loss, no-load current, and noise

• Class F or Class H core paint prevents corrosion and rust
 

Low Voltage Winding

• High quality copper foil with thermosetting epoxy prepreg cloth insulation

• Excellent insulation resistance and radial stress resistance against short circuit

• Tinned copper bar outgoing terminal

• Oven heated to 140°C for 4 hours – excellent industrial gas corrosion resistance
 

High Voltage Winding

• Insulated copper wire with Hengfengyou Electric patented technology

• Small volume: linear voltage gradient from top to bottom

• Large capacity: tape winding technology

• Extremely low electric field between adjacent conductors

• Reliable structure during operation and transportation
 

Key Advantages

• Copper tape + copper foil winding, flame retardant vacuum casting

• 45° full oblique joint core – low loss, low noise

• Thermosetting epoxy insulation – Class F/H available

• Strong short circuit withstand and industrial gas corrosion resistance

• OEM customized solutions available

 

Company Advantages – Built for Global Buyers

• Certifications |CB, CCC, KEMA, SASO, and more |
• Quality System | SQA management – guaranteed consistency |
• Fast Response | Quick quote + electrical design support |
• Delivery | Short lead time, worldwide shipping |
• After-Sales | Complete service system |
• Customization | OEM/ODM – factory visit welcome |

 

10kV Three-phase Epoxy Cast Dry Distribution Transformer Case



10kV Three-phase Epoxy Cast Dry Distribution Transformer FAQ
1. Standard & Certification

Q1: What international standards do your 10kV dry-type transformers comply with? Can they meet global distribution grid and industrial power distribution requirements?
A1: Our 10kV cast-resin dry-type transformers are fully designed and tested per IEC 60076-11 (dry-type power transformers) and IEC 60076-3 (insulation levels and dielectric tests), the core international standards for medium-voltage distribution transformers. We support full compliance with GB/T 10228, EN 60076, GOST, ANSI/IEEE C57.12, AS/NZS, INMETRO, SABS and SASO. Widely used for urban distribution grids, factory power distribution, commercial buildings and small-scale renewable energy grid-tie systems, we provide targeted standard matching assessment and complete certification documents to pass official grid connection and third-party project acceptance worldwide.
Q2: Can you provide official type test reports and third-party witnessed test documents for 10kV models? Is factory witnessed testing available?
A2: Complete CNAS-accredited full type test reports are available for the entire 10kV dry-type transformer series, fully complying with IEC mandatory test specifications. Key professional test items include ultra-low partial discharge test (≤10pC @1.1Ur), 95kV lightning impulse withstand test, 28kV power frequency withstand voltage test, temperature rise cycling test, short-circuit dynamic stability test and insulation aging verification. For municipal grid projects, industrial EPC and commercial complex projects, we support SGS, BV, TUV third-party witnessed factory tests (WTT) and full-process video recording to ensure test authenticity and authority.
Q3: What technical documents are included in standard delivery? Do you support multi-language professional manuals?
A3: The standard full-English technical document package includes 10kV medium-voltage grade nameplate datasheet, overall installation dimension drawing, high/low voltage wiring schematic diagram, complete FAT test report, professional operation & maintenance manual, safety operation specification and official spare parts list. We provide customized multi-language technical documents including Spanish, Portuguese, Arabic, French and Russian, and can adjust professional clauses according to local 10kV grid operation specifications to meet regional project acceptance requirements.

2. Technical Performance & Structural Advantages

Q4: What winding materials are optional for 10kV dry-type transformers? Can material quality and performance be guaranteed in contract?
A4: We provide two standardized winding solutions for 10kV medium-voltage scenarios: high-purity anaerobic copper winding (grid-grade high stability and low loss) and high-strength aluminum winding (cost-effective for general industrial and commercial projects). All windings adopt H-class high-temperature insulation system matched with 10kV international voltage level, manufactured via full vacuum epoxy resin integral casting process. Winding material type, insulation grade and electrical matching parameters can be clearly defined in technical agreements and formal contracts, accompanied by official material test certificates and full production traceability records. Optimized electric field homogenization design eliminates partial discharge risks, ensuring long-term stable, low-noise and low-loss operation.
Q5: Can 10kV transformer electrical parameters be fully customized? How to handle unqualified test results and defective products?
A5: All core electrical parameters support personalized customization to match client datasheets and site operating conditions, including ultra-low no-load/load loss, 4%–6% adjustable short-circuit impedance, ±2×2.5% voltage tap range and customized temperature rise limits. Every 10kV unit undergoes 100% full-item factory inspection before delivery, covering insulation resistance, partial discharge, dielectric withstand and temperature rise tests. Any non-compliant product will be prohibited from shipment immediately, with free professional rework, performance debugging or full machine replacement to ensure zero defective delivery.
Q6: Can 10kV dry-type transformers adapt to high altitude, coastal salt spray, dusty and seismic harsh working conditions?
A6: Targeted environmental adaptive design is available for all harsh working scenarios. For high-altitude areas above 1000m, we upgrade insulation clearance and optimize air cooling structure to prevent altitude-induced insulation breakdown; for coastal humid and salt-fog areas, we adopt anti-corrosion epoxy formula and overall anti-aging coating to resist salt erosion and moisture penetration; for dusty factories and indoor enclosed substations, a fully sealed protective shell is equipped to avoid dust-caused partial discharge; for seismic zones, integrated reinforced framework and multi-point anti-vibration structure enhance mechanical stability. All designs are customized according to actual site environmental parameters.
Q7: Are 10kV dry-type transformers suitable for renewable energy grid-tie? What is the harmonic resistance performance?
A7: 10kV cast-resin dry-type transformers are widely applied for distributed solar, small wind farms and energy storage grid-tie projects. Adopting high-performance low-loss silicon steel core and optimized winding layout, the transformer effectively suppresses harmonic heating and voltage distortion caused by inverter fluctuation and intermittent new energy loads. The reinforced insulation structure resists long-term harmonic impact and frequent load switching, avoiding local overheating and insulation aging, ensuring stable and reliable grid-tie operation for distributed new energy systems.
Q8: What is the standard noise level of 10kV dry-type transformers? Is low-noise customization available for urban and residential areas?
A8: Under standard IEC test conditions, the rated operating noise of 10kV dry-type transformers is ≤50dB, much quieter than traditional oil-immersed transformers. For urban residential areas, schools, hospitals and commercial districts, we provide ultra-low-noise customized design (≤42dB). By adopting core magnetic flux optimization, multi-layer vibration damping structure and buffer shock-absorbing base, equipment operation resonance is fundamentally eliminated. Official noise test certificates can be provided for environmental assessment and project acceptance.
Q9: What is the lightning impulse and short-circuit fault resistance capability of 10kV dry-type transformers?
A9: Our 10kV dry-type transformers adopt international standard LI95kV/AC28kV insulation level, fully compliant with IEC 60076-3 dielectric test standards, with excellent lightning impulse and switching overvoltage resistance. The integral vacuum casting structure and reinforced winding support design greatly improve short-circuit dynamic stability, effectively resisting strong electrodynamic force impact caused by sudden short-circuit faults and preventing winding displacement and insulation breakdown. Lightning impulse and short-circuit withstand test reports are available upon request.
Q10: What is the design service life of 10kV dry-type transformers? Does it follow standard insulation aging rules?
A10: The standard design service life of 10kV dry-type transformers is 25 years. With standardized operation and regular professional maintenance, the service life can be extended to 30–35 years. The oil-free epoxy resin insulation system strictly follows the IEC-standard 6℃ insulation aging principle, with sufficient high-temperature resistance margin and anti-aging performance. The fully sealed casting structure isolates air, moisture and dust, effectively delaying insulation degradation and maintaining stable performance throughout the equipment lifecycle.
Q11: Are you a professional manufacturer of 10kV dry-type transformers?
A11: We are a professional medium-voltage dry-type transformer manufacturer based in Qingdao, China, with decades of specialized R&D and export experience in 10kV distribution-grade models. We master mature vacuum casting and insulation technology, with all key processes including high-precision winding, integral vacuum casting, constant temperature curing and full-item testing completed in-house. Our 10kV transformers are widely exported globally for urban grid renovation, industrial power distribution, commercial complex and distributed new energy projects. Factory on-site audit and production inspection are warmly welcomed.

3. Customization, Dimension & Transportation

Q12: Can you provide non-standard customized 10kV dry-type transformers for special project requirements?
A12: We support full-dimensional non-standard customization for 10kV dry-type transformers. Customizable items include special electrical parameters, multi-grade voltage tap adjustment, ultra-low partial discharge optimization, compact customized dimensions for narrow indoor substations, vertical/horizontal mounting types, flame-retardant and explosion-proof upgrades, and intelligent temperature control & fan monitoring systems. Core accessories can be equipped with customer-specified international brands. All customized technical requirements are documented in formal technical agreements to ensure consistent delivery quality.
Q13: Can you provide accurate weight and dimension drawings? Are 10kV transformers suitable for cross-border long-distance transportation?
A13: After confirming the technical scheme, we provide formal quotations attached with accurate overall dimension drawings, installation diagrams and net/gross weight data. Adopting oil-free dry-type design, 10kV transformers have no oil leakage, pollution or safety hazards during transportation, featuring higher safety and convenience than oil-immersed products. For large-capacity units, we pre-assess oversize risks and provide professional hoisting, fixing and cross-border multi-modal transportation solutions to ensure intact delivery.
Q14: What is the standard export packaging mode for 10kV dry-type transformers?
A14: All 10kV dry-type transformers adopt international standard export packaging. The whole machine is fixed with high-strength steel frame and IPPC fumigated wooden box, equipped with multi-layer shockproof, anti-rust and moisture-proof materials. The oil-free, flame-retardant and explosion-proof design avoids international transportation inspection risks and environmental pollution. For long-distance ocean transportation, we equip impact recorders and anti-collision accessories to monitor transportation status in real time.

4. Production & FAT Acceptance

Q15: What is the production lead time for 10kV dry-type transformers? How to guarantee on-time delivery?
A15: The standard production lead time for conventional 10kV dry-type transformers is 15–22 working days. For customized models, harsh environment adaptive products and ultra-low loss special units, the production cycle is 22–30 working days. The exact delivery schedule is clearly specified in the formal contract. We regularly update key production nodes including winding processing, vacuum casting, curing and full testing, and adopt parallel production mechanisms to avoid delivery delay with strict contractual guarantee.
Q16: Can customers or third-party institutions witness 10kV FAT testing?
A16: We fully support customer on-site factory inspection and whole-process third-party witnessed FAT testing by SGS, BV and TUV. Professional test engineers cooperate with inspectors to complete all insulation, partial discharge, withstand voltage and temperature rise tests, and provide complete production records, raw material certificates and full test data for transparent and open factory acceptance.
Q17: Are core components traceable? Are key production processes outsourced?
A17: All core components (low-loss silicon steel sheet, H-class insulation materials, low-partial-discharge epoxy resin, high-purity winding wire) have complete batch traceability and official qualification certificates. Key processes including vacuum integral casting, constant temperature curing and dielectric testing are all independently completed in our factory without outsourcing, ensuring stable and consistent product performance for each batch.

5. Quotation, Payment & Customs Clearance

Q18: How long is the quotation validity period? Will the price fluctuate with raw material costs?
A18: The standard quotation validity for 10kV dry-type transformers is 15 working days with fixed unit price, unaffected by short-term raw material fluctuations. For large-scale municipal grid and EPC projects, we can extend the quotation validity up to 180 days. Expired quotations will be reissued free of charge with the latest official price.
Q19: What payment terms do you accept? Is L/C payment supported?
A19: We support flexible international payment methods, including TT telegraphic transfer and irrevocable sight L/C, suitable for global medium-voltage engineering projects. Advance payment ratio and installment terms can be flexibly negotiated according to project scale and cooperation duration, with all terms clearly stipulated in formal export contracts to protect bilateral interests.
Q20: Can you provide preferential customs clearance certificates to help customers reduce tariffs?
A20: We provide complete export customs clearance documents and preferential tariff certificates including CO, FORM E and FORM A. Professional document sorting and guidance help customers complete customs clearance efficiently and apply for regional tariff reduction policies to save project procurement costs.

6. Packaging, Logistics & Insurance

Q21: What is the export packaging standard? Is it suitable for long-distance sea freight?
A21: 10kV dry-type transformer export packaging adopts international long-distance transportation standard, integrating anti-rust, moisture-proof, shockproof and compression-resistant functions. IPPC fumigated wooden boxes meet global quarantine standards. The oil-free and pollution-free design adapts to long-term sea freight and multi-modal transshipment with zero inspection risks.
Q22: What logistics solutions are available for overseas delivery?
A22: We provide diversified targeted logistics solutions: sea freight for global conventional delivery; bulk carrier for large-capacity equipment; China-Europe railway for Eurasian inland projects; road truck transportation for neighboring cross-border projects, balancing delivery cycle and cost.
Q23: What is the cargo damage insurance claim procedure during transportation?
A23: All exported 10kV transformers are fully covered by international cargo transportation insurance. In case of cargo damage, customers only need to collect on-site photos, videos and delivery documents within 48 hours after arrival and submit a claim application. Our professional team provides full document support and one-stop claim guidance for efficient settlement per insurance policy and third-party assessment results.

7. SAT & On-Site Commissioning Service

Q24: Do you provide overseas on-site installation guidance and commissioning services?
A24: We provide global one-stop technical services, including overseas on-site installation guidance, equipment debugging, insulation testing, SAT acceptance and operator training with independent standardized quotation. Free 24/7 online remote technical support is permanently available for daily fault troubleshooting and technical consultation.

8. Warranty & After-sales Service

Q25: What is the warranty period and coverage scope for 10kV transformers?
A25: The standard warranty period for 10kV dry-type transformers is 2 years. For key municipal grid and large EPC projects, the warranty period can be extended to 3–5 years on demand. The warranty covers all manufacturing defects and original accessory faults, excluding damage caused by improper operation, long-term overload, external force impact and unauthorized disassembly.
Q26: Can you supply original spare parts after the warranty period expires?
A26: We provide lifelong supply of original spare parts and core wearing components at factory price, ensuring long-term safe and stable operation of customer equipment and eliminating after-sales maintenance worries.
Q27: What is the response speed of technical support and after-sales service?
A27: We implement 24/7 all-weather online technical support with immediate engineer response. Overseas on-site service can be arranged within 5–12 working days according to project location. For sudden power-affecting faults, we activate an emergency response mechanism to minimize project losses.
Q28: What quality control system is adopted for 10kV transformer production?
A28: Our factory fully implements ISO 9001 full-process quality control system, covering raw material incoming inspection, production process monitoring, semi-finished product testing and finished product full-item detection. Each 10kV transformer passes exclusive tests including partial discharge detection, 95kV lightning impulse test and 28kV power frequency withstand test before delivery. Third-party factory audit and quality inspection by BV, SGS and other institutions are fully supported.

Product parameters

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额定容量Capacity	额定电压及分接范围Rated voltage&Off-load tapping				联结组标号 Vector  GroupSymbol		空载损耗 NO-load loss（W）	负载损耗 Load loss（W） F级绝缘	空载电流 NO-load current（%）	短路阻抗Short circuit impedance(%)
	高压 H.V(kv)	高压分接范围  High pressure   Tap range（%）		低压 L.V(kv)
30	11 10.5 10 6.6 6.3 6	±5% ±2.5%		0.4 0.69	Dyn11 Yyn0		150	710	2	4
50							215	1000	2	4
80							295	1380	1.5	4
100							320	1570	1.5	4
125							375	1850	1.3	4
160							430	2130	1.3	4
200		±5% ±2x2.5%					495	2530	1.1	4
250							575	2760	1.1	4
315							705	3470	1	4
400							785	3990	1	4
500							930	4880	1	4
630							1070	5880	0.85	4
630							1040	5960	0.85	6
800							1215	6960	0.85	6
1000							1415	8130	0.85	6
1250							1670	9100	0.85	6
1600							1960	11700	0.85	6
2000							2440	14400	0.7	6
2500							2880	17100	0.7	6

 

Ordering instructions

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- Main parameters of transformer (voltage, capacity, loss and other main parameters)
- Transformer operating environment (altitude, temperature, humidity, location, etc.)
- Other customization requirements (coupling groups, colors, oil pillows, etc.)
- The minimum order quantity is 1 sets, worldwide delivery within 7 days
- Normal delivery period of 30 days, worldwide fast delivery