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Help CenterQinghao Custom Three-Phase Dry Type Power Distribution Transformer 10kV 11kV 20kV 35kV to 0.4kV (30kVA - 3150kVA)
Product Spotlights
-Low Loss & Low Noise: High-permeability silicon steel core reduces no-load loss and operational noise.
-Strong Short-Circuit Withstand: High mechanical strength with superior thermal and overload capability.
-Maintenance-Free & Moisture Proof: Excellent moisture resistance, ideal for humid environments without routine oil testing.
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Qinghao Custom Three-Phase Dry Type Power Distribution Transformer 10kV 11kV 20kV 35kV to 0.4kV (30kVA - 3150kVA)
High‑performance resin insulated dry‑type three‑phase transformer rated at 11kV /20kV /35kV, custom‑manufactured to IEC standards for harsh‑environment power transmission solutions.
Safe, Reliable Power Distribution for Modern Grids & Buildings
1. Product Overview
Our Three-Phase Epoxy Cast Resin Dry Type Power Distribution Transformer is engineered for demanding indoor and outdoor distribution networks, high-rise buildings, commercial centers, data centers, airports, and industrial plants. Designed to handle primary voltages from 10kV up to 35kV with secondary voltages of 0.4kV / 0.415kV (custom configurations available), with rated capacities ranging from 30kVA to 3150kVA (up to 4000kVA upon request).
Featuring high-grade epoxy resin vacuum casting, the transformer eliminates fire hazards and oil contamination risks, providing superior environmental safety, high thermal withstand, and completely maintenance-free operation.
2. Main Characteristics
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High Flame Retardancy & Explosion-Proof: Windings are encapsulated in high-grade, self-extinguishing epoxy resin under vacuum. Fire-resistant, non-toxic, and free of hazardous insulating liquids, ensuring optimal safety for occupied buildings and critical infrastructure.
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Low Loss & Low Noise Operation: The magnetic core is manufactured with high-permeability, cold-rolled grain-oriented (CRGO) silicon steel sheets with precision step-lap mitered joints, minimizing no-load losses, excitation currents, and acoustic noise.
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Superior Moisture & Contamination Resistance: The cast resin structure prevents moisture penetration, dust ingress, and harsh industrial chemical attack, making it suitable for 100% relative humidity and severe environments without pre-drying.
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High Mechanical & Short-Circuit Strength: Precision foil/wire winding structures coupled with glass fiber reinforcement provide high mechanical rigidity against electromechanical stresses and transient overvoltage surges.
3. Technical Features & Performance Highlights
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Standards Compliance: Fully designed, manufactured, and tested in accordance with IEC 60076-11, IEEE C57.12.01, GB/T 10228, and ISO 9001 quality management standards.
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Cooling Methods: AN (Air Natural) self-cooling for continuous 100% rated capacity; AF (Air Forced with temperature-controlled cross-flow fans) for up to 40%–50% forced overload capability.
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Insulation Class & Temperature Limits: Class F (155 degree) or Class H (180 degree) insulation system with temperature rise limits of less than 100K (Class F) / less than 125K (Class H).
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Thermal Protection System: Embedded PT100 temperature sensors connected to a multi-channel digital controller for real-time monitoring, auto fan triggering, alarm, and trip protection.
Enclosure Protection: Optional IP00 (open core/coil), IP20, IP23, or custom outdoor IP54 protective enclosures available.
4. Key Technical Specifications Table
| Parameter / Technical Item | Standard Specification & Custom Range |
| Rated Capacity Range | 30 kVA – 3150 kVA (Customizable up to 4000 kVA) |
| Primary Voltage (HV) | 6kV, 10kV, 11kV, 13.8kV, 20kV, 33kV, 35kV |
| Secondary Voltage (LV) | 0.4kV, 0.415kV, 0.433kV, 0.48kV, or custom request |
| Frequency | 50 Hz / 60 Hz |
| Phase & Vector Group | Three-Phase, Dyn11 / Yyn0 / Custom |
| Cooling Method | AN (Air Natural) / AF (Air Forced) |
| Insulation Class | Class F / Class H |
| Core Material | High-permeability Cold-Rolled Grain-Oriented (CRGO) Silicon Steel |
| Winding Material | High-grade Electrolytic Copper / Aluminum Foil & Wire |
| Enclosure Rating | IP00 (Without Enclosure), IP20, IP23, IP31, IP54 |
| Temperature Control | PT100 RTD Sensors + Digital Temperature Controller |
| Compliance Standards | IEC 60076-11, IEEE C57.12.01, GB/T 10228 |
5. Quality Control & Factory Routine Testing
Every single dry-type transformer undergoes rigorous routine testing before leaving our factory to ensure 100% operational reliability and safety compliance:
Winding Resistance Measurement
Voltage Ratio Inspection & Vector Group Verification
Impedance Voltage & Load Loss Measurement
No-Load Loss & No-Load Current Measurement
Separate-Source AC Voltage Withstand Test
Induced Overvoltage Withstand Test (DVDF)
Partial Discharge (PD) Measurement (Strictly controlled within standard limits, $le 10text{pC}$)
Insulation Resistance & Temperature Controller System Calibration
6. Applications
Commercial & Public Buildings: High-rise buildings, shopping malls, airports, subway stations, hospitals, and educational institutions where strict fire safety and low noise are mandatory.
Data Centers & IT Infrastructure: Critical power distribution requiring continuous reliability, low maintenance, and zero leakage risk.
Industrial & Hazardous Locations: Chemical plants, pharmaceutical facilities, textile mills, and mining operations demanding high dust/moisture resistance and non-flammable equipment.
Renewable Energy & Infrastructure: Solar and wind power step-up/auxiliary distribution systems, indoor substations, and compact integrated packaged substations (CSS).
7. Frequently Asked Questions (FAQ)
Q1: Can you customize enclosure protection classes (e.g., IP20, IP23, IP54) and special voltage configurations?
A: Yes. We offer fully customizable solutions ranging from unhoused IP00 units to indoor IP20/IP23 and outdoor weatherproof IP54 enclosures with customized cable entry positions, busbar connections, and voltage ratings from 6kV to 35kV.
Q2: What is the maximum partial discharge level of your cast resin dry type transformers?
A: Our epoxy cast resin transformers are cast under strict high-vacuum conditions to eliminate internal voids, ensuring partial discharge levels are strictly maintained below $10text{pC}$ (well below standard IEC limits), ensuring long service life without insulation breakdown.
Q3: Are third-party factory inspections and routine test reports supported before dispatch?
A: Absolutely. Full factory routine test reports are provided with every shipment. We also welcome client witness testing and third-party factory audits/inspections by agencies such as Bureau Veritas (BV), SGS, and Intertek.
Q4: How is the dry-type transformer packaged for ocean freight?
A: Transformers are securely mounted on heavy-duty wooden skids or enclosed in export-grade fumigation-free wooden cases, fully covered with multi-layer moisture-proof stretch film and heavy desiccant to ensure dry, pristine condition upon arrival.
8. Get a Custom Quote & Technical Drawing
Need a custom transformer design, technical datasheet, or CAD dimension layout for your project?
Contact our engineering sales team today to get a detailed technical proposal and a competitive quotation within 12 hours!
To help us provide an accurate quotation and drawing, please provide:
Rated Capacity: (kVA / MVA)
Primary & Secondary Voltages: (e.g., 10kV to 0.4kV, 11kV to 0.415kV)
Tapping Range: (e.g., $pm2times2.5%$ Off-Circuit / On-Load)
Vector Group & Frequency: (e.g., Dyn11 / Yyn0, 50Hz / 60Hz)
Enclosure Protection Class: (IP00 without enclosure, IP20, IP23, IP54 outdoor)
Cooling Method: (AN Natural Air / AF Forced Air with fans)
Winding Material: (Copper / Aluminum)
Temperature Controller & Accessories: (Digital temperature controller, PT100 RTDs, surge arresters, etc.)
Installation Site Conditions: (Indoor/outdoor, altitude, ambient temperature range, humidity, seismic/corrosion requirements)
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