Hermetically Sealed Oil Immersed Step-Up Transformer for Utility Scale Solar PV Power Plant Connection 20kV to 0.4kV 1250kVA
HENTG POWER 1250kVA 20kV/0.4kV ইন্ডাস্ট্রিয়াল স্টেপ আপ অয়েল ইমার্সড ট্রান্সফরমার ইউটিলিটি-স্কেল পিভি প্ল্যান্ট, BESS এবং হাইড্রো পাওয়ার ইন্টিগ্রেশনের জন্য ডিজাইন করা হয়েছে। ফুটো ঝুঁকি কমাতে hermetically সিল নির্মাণ বৈশিষ্ট্য.
Utility Scale Step-Up Transformer
,Oil Immersed Step-Up Transformer
,1250kVA Step-Up Transformer
The HENTG POWER 1250kVA 20kV/0.4kV three-phase step-up transformer is an industrial oil-immersed power distribution solution engineered for medium-voltage utility applications. It is designed to convert low-voltage (0.4kV) generation input to medium-voltage (20kV) grid-level output, supporting applications in renewable energy integration, battery energy storage systems (BESS), and hydroelectric facilities. The unit features a robust hermetically sealed tank filled with high-grade mineral oil, providing stable dielectric strength and thermal performance. It is manufactured in accordance with international standards for power transformers to support reliable operation in outdoor and substation environments.
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Enhanced Sealed Tank Design:
Features a fully welded, hermetically sealed tank construction with reinforced corrugated fins. This configuration reduces the reliance on traditional conservator breathing and helps limit the potential for oil spillage—an important consideration for ecological zones near hydro plants and solar farms.
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Efficient Core Performance:
Constructed with grain-oriented silicon steel cores to support reduced no-load losses and hysteresis. This contributes to improved overall efficiency and helps lower operational expenditure for EPC and utility operators.
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Optimized for Step-Up Duty:
The winding configuration is calculated to accommodate the harmonic and inrush current characteristics associated with PV inverters and BESS power conversion systems (PCS), supporting stable voltage regulation from 0.4kV to 20kV.
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Durable External Protection:
Surface treatment includes anti-corrosion primer and polyurethane topcoat suitable for C4/C5-I environmental conditions, helping to extend service life in coastal hydropower sites and high-humidity solar PV fields.
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Flexible Monitoring Integration:
Equipped with standard pockets for a dial thermometer, liquid level gauge, and pressure relief device. Optional ports are available for PT100 temperature sensors and Buchholz relay integration to support SCADA monitoring in unmanned substations.
This HENTG POWER oil-immersed transformer incorporates engineering details suitable for modern power infrastructure requirements.
| Category | Parameter / Feature |
|---|---|
| Model Reference | HENTG-S11-1250/20-0.4 Step Up |
| Capacity | 1250 kVA (ONAN Cooling) |
| Primary Voltage (HV Side) | 20 kV (Step-Up Output) |
| Secondary Voltage (LV Side) | 0.4 kV (Input from Inverter/PCS) |
| Vector Group | Dyn11 or YNd11 |
| Frequency | 50Hz / 60Hz Configurable |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Tank Design | Hermetically Sealed Corrugated Tank |
| Insulation Liquid | Mineral Oil (PCB-Free) with High Dielectric Breakdown Voltage (>50kV) |
| Core Material | Cold Rolled Grain Oriented (CRGO) Silicon Steel, Step-Lap Joint Design |
| Winding Material | Electrolytic Grade Copper (Cu) or Aluminum (Al) with thermally upgraded paper insulation |
| Tap Changer | Off-Circuit Tap Changer (OCTC) on HV side, ±2x2.5% or ±5% Range |
| Terminal Arrangement | Sidewall bushings for 20kV (Porcelain/Composite) and 0.4kV (Porcelain) |
Target Environments: PV Power Plant, BESS, Hydro Power Station
| Scenario | Technical Consideration | HENTG POWER Design Approach |
|---|---|---|
| Utility-Scale PV Farm | Solar inverters output at low voltage (400V) and are located in open, dusty areas. Traditional transformer designs may allow moisture ingress over time. | Hermetically Sealed Corrugated Fins: The tank is completely sealed from the atmosphere. Corrugated walls flex to accommodate oil thermal expansion, reducing the air-oil interface. Result: Helps reduce routine oil maintenance and supports site cleanliness in solar arrays. |
| BESS Substation | BESS requires bidirectional power flow. Transformers need to manage load fluctuations and potential reverse power flow. | Electromagnetic Design for Inverter Duty: Winding insulation is reinforced to handle harmonic distortion and switching transients from PCS systems. The welded tank cover helps avoid gasket fatigue under cyclical thermal stress. |
| Small to Medium Hydro Station | High humidity and proximity to water increase corrosion potential. Environmental guidelines restrict oil leakage. | Heavy-Duty Corrosion Protection: Tank exterior undergoes preparation to SA 2.5 standards and receives a multi-layer coating. Double-sealed bushing gaskets and leak-tested weld seams support a closed system suitable for sensitive ecological areas. |
Ready to power your next renewable project? Contact HENTG POWER engineering support today for a specific FAT procedure and loading schedule tailored to your grid requirements.
