Three Phase Oil Type Step-Up Distribution Transformer for Hydroelectric Power Station 20kV 0.4kV Minimum Capacity 1600kVA
Μετασχηματιστής Step-Up τύπου λαδιού 1600kVA 20kV/0,4kV για Hydro Solar BESS
Oil Type Step-Up Distribution Transformer
,Three Phase Step-Up Distribution Transformer
This three-phase oil-immersed step-up distribution transformer is purpose-built for renewable energy generation facilities requiring voltage transformation from 0.4kV to 20kV. With a rated capacity of 1600kVA, the unit serves as a critical interface between low-voltage power sources—such as hydro turbines, solar inverters or battery storage containers—and the medium-voltage distribution grid.
The transformer utilizes mineral oil as both dielectric coolant and arc-quenching medium, ensuring stable thermal performance under continuous full-load operation. The hermetically sealed tank construction prevents ingress of moisture and oxygen, slowing insulation aging. Designed in accordance with IEC 60076 standards, this transformer is engineered for consistent operation in outdoor substations, power houses and renewable energy collector stations.
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Renewable Energy Optimized Design
Engineered specifically for step-up duty in hydro, solar PV and battery storage applications. Winding configuration and impedance values are tailored to accommodate inverter harmonics and variable generation profiles.
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High Efficiency Core Technology
Utilizes cold-rolled grain-oriented (CRGO) silicon steel laminations with step-lap joint design. No-load losses remain well below applicable efficiency regulation thresholds, contributing to improved lifetime energy yield and operational cost control over the asset lifecycle.
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Hermetically Sealed Conservation
Fully welded tank cover with nitrogen cushion or integral expansion radiators eliminates contact between insulating oil and ambient air. This preservation system extends oil service intervals and maintains dielectric integrity in humid or coastal environments.
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Robust Outdoor Construction
Heavy-gauge steel tank with multi-layer corrosion-resistant coating system suitable for outdoor exposure. Radiator fins are reinforced for mechanical strength and seismic compliance where specified.
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Low Maintenance Requirements
The sealed oil preservation system combined with silica gel breather bypass means no routine oil sampling or filtration is required under normal operating conditions. External surfaces are accessible for periodic cleaning and inspection without de-energization.
Parameter Value / Description
| Rated Capacity | 1600 kVA |
| Primary Voltage (HV) | 20 kV |
| Secondary Voltage (LV) | 0.4 kV |
| Phases | Three Phase |
| Frequency | 50 Hz (60 Hz available upon request) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Vector Group | Dyn11 (other configurations available) |
| Tapping Range | ±2×2.5% (off-circuit tap changer) |
| Impedance Voltage | 6.0% typical @ 75°C |
| Winding Material | Copper (HV) / Copper (LV) |
| Insulation Class | Class A (105°C temperature rise limit) |
| Tank Construction | Hermetically sealed corrugated wall or panel-type radiator |
| Oil Type | Mineral oil (inhibited) per IEC 60296 |
| Applicable Standards | IEC 60076, or ANSI / IEEE C57 upon request |
- LV winding positioned closer to the core to minimize short-circuit radial forces.
- HV winding employs multi-layer disc construction for improved impulse voltage distribution.
- Inter-layer insulation utilizes high-density diamond-dotted paper for enhanced mechanical rigidity during thermal cycling.
- ONAN cooling relies on natural convection of oil through radiators and air circulation over tank surfaces.
- Calculated temperature rise is limited to 60°C over ambient for top oil, 65°C average winding rise, ensuring thermal margin for overload or high ambient conditions encountered in solar farm container stations.
- CRGO silicon steel laminations with domain-refined microstructure.
- Operating flux density maintained below 1.7 Tesla to reduce harmonic excitation current and audible noise emission.
Challenges:
- High harmonic content from inverter output can induce additional winding heating.
- Intermittent generation causes frequent thermal cycling.
- Outdoor installation in open fields with high ambient temperature and dust exposure.
Design Measures & Solutions:
- Winding conductor cross-sections sized with harmonic de-rating factor per IEEE C57.110 to prevent overheating.
- Reinforced core clamping structure accommodates daily thermal expansion and contraction without loosening.
- IP54 rated terminal box with UV-resistant cable glands for field wiring integrity.
- Radiator surface treated with high-emissivity paint to enhance heat dissipation under direct sun load.
Challenges:
- Bi-directional power flow when batteries charge from grid and discharge to grid.
- Voltage fluctuations during rapid load transitions.
- Space constraints within containerized battery enclosures.
Design Measures & Solutions:
- Symmetrical winding design supports bi-directional operation without performance penalty.
- Dyn11 vector group provides 30° phase shift to help mitigate triplen harmonic circulation.
- Compact corrugated tank option available for installation adjacent to battery containers without extensive civil works.
- Low partial discharge level (<10pC) verified by routine testing to enhance reliability near sensitive battery monitoring electronics.
Challenges:
- High humidity and potential water spray environment.
- Potential for sustained overload during peak water flow seasons.
- Remote locations with limited maintenance access.
Design Measures & Solutions:
- Hermetically sealed construction with welded main cover eliminates gasketed joints subject to moisture ingress.
- Overload capability designed per IEC 60076-7 for cyclic loading profiles common to run-of-river hydro schemes.
- External coating system with minimum C4 corrosion classification for fresh water splash zones.
- Off-circuit tap changer located within the tank and operated via external drive mechanism to maintain seal integrity.
- Q1: Is this transformer suitable for bi-directional power flow in a BESS installation?
- Yes, the symmetrical winding arrangement and Dyn11 vector group configuration support both step-up (discharge to grid) and step-down (charging from grid) operation without modification. The design does not impose directional restrictions.
- Q2: What is the expected temperature rise during full solar generation at midday?
- The transformer is designed for a maximum average winding temperature rise of 65°C over a 40°C ambient. At 1600kVA continuous load, the hot-spot temperature remains within Class A insulation limits. Actual field measurements depend on site elevation, ventilation and solar radiation.
- Q3: Can the HV winding be supplied with a different voltage rating, such as 22kV or 33kV?
- Yes, the design can be adapted for other primary voltages up to 36kV. Custom voltage ratios are available upon request with corresponding adjustments to winding turns and insulation clearances.
- Q4: What maintenance activities are required during the operational life?
- With hermetically sealed construction, no routine oil sampling or filtration is mandated. Periodic external inspections of paint integrity, bushing cleanliness and radiator fin condition are recommended. Electrical tests may be performed at five-year intervals per local utility practice.
- Q5: Does this transformer include on-load tap changing capability?
- The standard configuration includes an off-circuit tap changer with ±2×2.5% range, intended for voltage adjustment during de-energized commissioning. On-load tap changer options are available for applications requiring voltage regulation under load.
- Q6: What documentation is provided for grid connection approval?
- Standard documentation includes dimensional outline drawings, nameplate data sheet, routine test report (including no-load loss, load loss, impedance and applied/induced potential test results), and material safety data sheet for insulating oil. Type test certificates can be furnished upon request.
Contact our engineering team today to request a detailed technical datasheet and discuss your specific project voltage and capacity requirements.
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