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Help CenterOil Immersed Distribution Transformer 3 Phase ISO Certified Custom KVA Transformer For Industrial Power Supply
Product Spotlights
-Oil Leak Proof Design: Features high-quality rubber gaskets and advanced sealing to prevent leaks.
-Low Loss and Noise: Utilizes hydraulic compaction and core design to minimize noise and energy loss.
-Strong Short Circuit Withstand: Engineered with high-frequency welding and hydraulic compaction for superior durability.
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Oil Immersed Distribution Transformer 3 Phase ISO Certified Custom kVA Transformer For Industrial Power Supply
Qinghao ISO‑certified 3‑phase oil‑immersed distribution transformer supports custom kVA capacity to deliver stable power for diverse industrial power supply projects.
1. Product Overview
Our Three-Phase Oil-Immersed Hermetically Sealed Power Distribution Transformer is specifically engineered for modern power distribution networks, industrial plants, commercial complexes, and renewable energy projects. Designed to handle primary voltages from 10kV up to 35kV and secondary voltage of 0.4kV (custom voltage configurations available), with rating capacities ranging from 30kVA to 4000kVA.
Featuring a fully sealed corrugated oil tank design, the transformer oil is completely isolated from atmospheric air and moisture. This design prevents oil degradation, extends operational lifespan, eliminates routine oil maintenance, and ensures exceptional performance under severe environmental conditions.
2. Main Characteristics
Hermetically Sealed & Maintenance-Free: The active part applies a core free-hanging structure with high-quality acrylate rubber gaskets to effectively inhibit aging caused by heat and sunlight. The oil tank uses corrugated sheets as thermal expansion elements, completely isolating the insulating oil from the atmosphere to prevent moisture and oxygen ingress.
Low Loss & Energy Efficiency: The magnetic core is built with high-quality cold-rolled grain-oriented (CRGO) silicon steel sheets utilizing fifth-order step-lap stacking technology. This significantly reduces no-load loss, no-load current, and noise levels during operation.
High Short-Circuit Resistance: High-voltage windings are wound with high-strength enamelled or paper-insulated wire, while low-voltage windings utilize high-strength wire or copper foil. The uniform distribution of ampere-turns and optimized insulation geometry provide superior capability to withstand electromagnetic short-circuit forces.
Superior Anti-Corrosion Tank Surface: The corrugated tank undergoes automated multi-stage surface pretreatment—including degreasing, pickling, phosphating, and electrophoresis—followed by outdoor powder spray coating and high-temperature curing. This ensures robust protection against salt spray, high humidity, and severe industrial corrosion.
3. Technical Features & Performance Highlights
Standards Compliance: Fully designed, manufactured, and tested in strict accordance with IEC 60076, GB/T 1094, GB/T 6451, and IEEE / ANSI C57 standards.
Cooling System: ONAN (Oil Natural Air Natural) self-cooling system designed for continuous 100% full-load output under normal operating conditions.
Temperature Rise Limits: Winding temperature rise ≤ 65K, Top oil temperature rise ≤ 60K (under standard ambient conditions).
Voltage Tapping Range: Off-Circuit Tap Changer (OCTC) with ±2×2.5% or ±5% regulation range. On-Load Tap Changer (OLTC) is available upon request.
Insulation Levels: Fully insulated according to system voltage rating (e.g., LI75 AC35 for 10kV systems; LI200 AC85 for 35kV systems).
Vector Groups & Frequency: Standard Dyn11 or Yyn0 vector groups; 50 Hz or 60 Hz operating frequency.
4. Key Technical Specifications Table
| Parameter / Technical Item | Standard Specification & Custom Range |
| Rated Capacity Range | 30 kVA – 4000 kVA (Customizable) |
| Primary Voltage (HV) | 6kV, 10kV, 11kV, 15kV, 20kV, 33kV, 35kV (±2×2.5% or ±5%) |
| Secondary Voltage (LV) | 0.4kV, 0.415kV, 0.433kV, or custom request |
| Frequency | 50 Hz / 60 Hz |
| Phase & Vector Group | Three-Phase, Dyn11 / Yyn0 / Custom |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Core Material | High-permeability Cold-Rolled Grain-Oriented (CRGO) Silicon Steel |
| Winding Material | High-grade Electrolytic Copper / Aluminum Wire or Foil |
| Tank Type | Hermetically Sealed Corrugated Oil Tank |
| Compliance Standards | IEC 60076, GB/T 1094, GB/T 6451, IEEE/ANSI C57 |
5. Quality Control & Factory Routine Testing
Every single transformer undergoes rigorous routine testing before leaving our factory to ensure 100% operational reliability:
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)
Transformer Oil Dielectric Strength & Breakdown Voltage Test
6. Applications
Power Grids & Substations – Step up from generation voltage to transmission level, or step down to distribution voltage at substations.
Industrial Power Supply – Main and distribution transformers for steel mills, cement plants, mining, petrochemical, oil & gas facilities.
Commercial & Residential Distribution – Pole mounted or pad mounted units for rural electrification and urban underground networks.
Renewable Energy – Step up transformer for solar farms and wind power plants, converting inverter output (0.48kV/0.69kV) to medium voltage (10kV–35kV) or higher.
7. Frequently Asked Questions (FAQ)
Q1: Can you customize special voltage ratios or dual-voltage ratings (e.g., 13.8kV, 33kV, or 35kV)?
A: Yes, we provide full engineering customization for primary voltages from 6kV up to 35kV and various low-voltage outputs. Tap changers (OCTC or OLTC) can be tailored to your local grid requirements.
Q2: How is the transformer packaged for long-distance ocean freight?
A: Transformers are secured on heavy-duty wooden skids or fumigation-free wooden cases, wrapped in moisture-proof stretch film with desiccant, and rigidly anchored inside containers to prevent damage during transit.
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!
Please provide:
Rated power (kVA / MVA)
Primary and secondary voltages
Frequency (50Hz / 60Hz)
Vector group (Dyn11, Yyn0, etc.)
Tap changer type and range
Cooling method
Accessories required
-
Installation environment (altitude, ambient temperature, humidity, corrosion level)
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