The H61 3 Phase Oil Immersed transformer (11kV/380V) is a high-efficiency electrical transformer designed for medium voltage distribution. Utilizing mineral oil for insulation and cooling, this transformer is ideal for industrial facilities, commercial buildings, and power utilities. With robust construction, excellent thermal performance, and high mechanical strength, this transformer ensures safe and reliable voltage conversion from 11kV to 380V in demanding environments.
Key Features
- Voltage Rating: 11kV Primary / 380V Secondary
- Phase: Three-phase (3 phase)
- Cooling: Oil-immersed natural air cooling (ONAN)
- Frequency: 50/60Hz
- Insulation Class: Class A
- Tap Changer: ±2×2.5% or ±5% for voltage regulation
Product Image
Technical Specifications
| Parameter | Specification |
|---|
| Rated Power | 100 kVA – 2500 kVA |
| Primary Voltage | 11kV |
| Secondary Voltage | 380V |
| Phase | 3 Phase |
| Frequency | 50Hz / 60Hz |
| Vector Group | Dyn11 / Yyn0 (customizable) |
| Cooling Method | ONAN / ONAF (optional) |
| Insulation Class | A |
| Temperature Rise | ≤ 65°C |
| Impedance | 4% / 6% (based on capacity) |
| Core Material | Cold Rolled Grain Oriented Silicon Steel |
| Oil Type | Mineral Oil (IEC 60296) |
| Standards Compliance | IEC 60076, GB1094, ANSI C57 |
1. Superior Heat Dissipation
Oil immersed transformers like the H61 model use mineral oil to dissipate heat, allowing the transformer to handle higher loads without overheating.
2. Long Operational Life
Thanks to vacuum-sealed tanks and corrosion-resistant materials, oil-immersed transformers are known for their durability and extended service life.
3. Excellent Electrical Insulation
Transformer oil enhances dielectric strength between windings and protects against electrical faults.
Application Scenarios
- Manufacturing Plants
- Shopping Malls
- Hospitals and Data Centers
- Power Distribution Stations
- Mining and Petrochemical Industries
Installation & Maintenance
The H61 11kV/380V transformer is designed for both indoor and outdoor installation. It requires minimal maintenance, with periodic checks of oil level, dielectric strength, and insulation resistance.
Maintenance Tips:
- Inspect oil quality every 1–2 years
- Check for leaks around bushings and tank seals
- Use oil filtration to extend lifespan
FAQs
Answer: Dry-type transformers use air for cooling and are suitable for indoor, fire-prone environments. Oil-immersed transformers use oil for both cooling and insulation, offering better efficiency and higher power ratings.
Answer: Yes, we offer full customization for secondary voltage levels, vector groups, and tap changers based on your requirements.
Answer: The H61 transformer can be equipped with Buchholz relay, temperature gauge, pressure relief valve, and oil level indicator upon request.
- Robust thermal and mechanical performance
- Strong resistance to electrical short circuits
- Minimal maintenance requirements
- Adaptable to various environmental conditions
- Built to meet international transformer standards
Suitable Environments
This transformer is widely used in:
- Power distribution for rural electrification
- Industrial automation systems
- Renewable energy step-up/down stations
- Temporary installations like construction sites
- Utility grid substations
