Jiangsu Yawei Transformer Co.,Ltd. is one of the leading manufacturers and suppliers of 35kv oil-immersed three-phase double-winding non-excitation voltage regulating transformer new energy generation-side transformer for solar pv, wind power and energy storage in China. Please feel free to buy high quality 35kv oil-immersed three-phase double-winding non-excitation voltage regulating transformer new energy generation-side transformer for solar pv, wind power and energy storage from our factory. Customized orders are welcome.
Product Overview
Renewable energy projects place different demands on transformers than conventional distribution systems. Solar PV and battery storage systems are connected through power electronic converters, while wind turbines can introduce fluctuating loads and demanding electrical operating conditions. The transformer therefore needs to provide dependable voltage conversion while handling changing power output and maintaining suitable thermal and insulation performance.
The 35kV oil-immersed transformer is installed on the new energy generation side, normally between the inverter or generator output and the medium-voltage collection system. In a photovoltaic project, for example, the transformer can step up the inverter-side voltage to a medium-voltage level such as 35kV for collection and transmission.
A representative product range for this type of transformer includes capacities from approximately 1,000kVA to 6,300kVA, with high-voltage ratings around 35–38.5kV and low-voltage ratings selected according to the project configuration. Actual capacity, voltage, impedance, vector group, and tap range should be confirmed against the project specification.
Key Features
The transformer is optimized for use with solar PV, wind power, and energy storage systems. Its electrical characteristics can be coordinated with the inverter, generator, collector system, and grid connection requirements.
For wind projects, transformer selection should consider the generator's rated output, operating voltage, thermal conditions, and the electrical environment created by power converters. IEC/IEEE 60076-16 highlights the importance of matching transformer rated power with the associated generator output and strengthening testing for the electrical conditions encountered in wind turbine applications.
The active part is immersed in insulating oil, which provides both electrical insulation and heat transfer. The oil-immersed design is well suited to medium- and high-capacity renewable energy applications where continuous operation and efficient heat dissipation are important.
Depending on the rating and project requirements, the transformer can use ONAN or other customized cooling arrangements.
The three-phase double-winding structure provides a straightforward interface between the renewable energy generation or inverter side and the medium-voltage collection system.
The winding arrangement, connection group, short-circuit impedance, and insulation level can be customized according to the system design.
The high-voltage winding can be equipped with an off-circuit tap changer to provide voltage adjustment within the specified range.
Typical options include:
±2 × 2.5% or ±5%
Because non-excitation voltage regulation requires the transformer to be de-energized before changing the tap position, the tap setting is normally selected during commissioning or when the system is shut down for maintenance.
Solar and wind installations are often located in open, remote environments where temperature changes, dust, humidity, and transportation conditions can be demanding. The transformer tank, insulation system, cooling arrangement, and accessories can therefore be configured according to the actual site environment.
For outdoor renewable energy projects, the transformer can also be integrated into a prefabricated substation or inverter-transformer station depending on the project architecture.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | 35kV Oil-Immersed Three-Phase Double-Winding Transformer |
| Application | PV, Wind Power, Energy Storage |
| Installation Position | New Energy Generation Side |
| Transformer Type | Oil-Immersed Power Transformer |
| Phase | Three Phase |
| Winding | Double Winding |
| Rated HV Voltage | 35kV / 38.5kV |
| Rated LV Voltage | 0.4kV–1.14kV or Customized |
| Rated Capacity | 1,000–6,300kVA or Customized |
| Voltage Regulation | Non-Excitation Voltage Regulation |
| Typical Tap Range | ±2×2.5%, ±5% |
| Cooling | ONAN / Customized |
| Frequency | 50Hz / 60Hz |
| Vector Group | Yd11 or Customized |
| Impedance | Project-Specific |
| Insulation Medium | Transformer Oil |
| Installation | Indoor / Outdoor |
| Applicable Standards | IEC 60076 / Project-Specific Standards |
The final technical parameters should be confirmed according to the inverter or generator output, grid voltage, project capacity, environmental conditions, and customer specification.
A representative 35kV product series lists HV ratings of 35–38.5kV, LV ratings from 0.4kV to 1.14kV, Yd11 connection, and capacities from 1,000kVA through 6,300kVA.
Typical Transformer Configuration for PV Projects
In a utility-scale solar PV plant, the power flow can generally be represented as:
PV Modules → DC Combiner → Inverter → 35kV Oil-Immersed Transformer → MV Collection Network → Substation → Grid
The inverter converts DC electricity generated by the PV modules into AC electricity. The transformer then increases the inverter output voltage to the medium-voltage collection level.
For example, a project may use an inverter output around 0.8kV–1.14kV and step this voltage up to approximately 35kV. The exact voltage combination depends on the inverter manufacturer and project electrical design.
Applications
Solar Photovoltaic Power Plants
The transformer is used between PV inverters and the medium-voltage collector system. It is suitable for utility-scale solar farms as well as distributed renewable energy installations requiring medium-voltage collection.
Wind Farms
For wind power projects, the transformer can serve as the step-up transformer connecting the wind turbine generator or converter output to the wind farm's medium-voltage collection network. IEC/IEEE 60076-16 covers transformers used for this type of wind turbine step-up application up to a highest equipment voltage of 72.5kV.
Battery Energy Storage Systems
In battery energy storage projects, bidirectional PCS equipment operates between the battery DC system and the AC grid. The 35kV transformer provides the voltage interface between the PCS and medium-voltage collection system.
Because energy storage systems can operate in both charging and discharging modes, transformer selection should take into account the actual operating profile, power factor, harmonics, thermal loading, and protection coordination.
Hybrid Renewable Energy Projects
The transformer can also be used in combined solar + wind + energy storage projects where several renewable energy resources are connected to a common medium-voltage electrical system.
Main Components
| Component | Function |
|---|---|
| Silicon Steel Core | Provides an efficient magnetic circuit |
| HV Winding | Connects to the medium-voltage side |
| LV Winding | Connects to inverter or generator equipment |
| Transformer Oil | Provides insulation and cooling |
| Transformer Tank | Houses and protects the active part |
| Off-Circuit Tap Changer | Adjusts the voltage ratio when de-energized |
| Radiators | Dissipate heat from transformer oil |
| Bushings | Provide insulated electrical connections |
| Oil Level Indicator | Monitors transformer oil level |
| Pressure Relief Device | Releases excessive internal pressure |
| Conservator | Accommodates oil volume changes where applicable |
Advantages for New Energy Projects
The combination of 35kV medium-voltage output, oil-immersed insulation, double-winding construction, and non-excitation voltage regulation makes this transformer suitable for a wide range of renewable generation-side applications.
Its main advantage is flexibility. The transformer can be engineered around the actual inverter or generator voltage rather than forcing the project to use a fixed configuration. Capacity, impedance, vector group, tap range, cooling method, accessories, and enclosure arrangements can all be specified according to the project.
For large-scale PV, wind, and energy storage projects, this type of transformer also provides a practical interface between distributed power electronic equipment and the medium-voltage collection network.
Why Choose Yawei 35kV New Energy Transformer?
Yawei Transformer can provide customized 35kV oil-immersed three-phase double-winding transformers for photovoltaic, wind power, and energy storage applications.
Project-specific engineering can cover rated capacity, HV/LV voltage, tap range, vector group, impedance, cooling method, protection accessories, cable or bushing arrangement, and installation configuration.
For EPC contractors, renewable energy developers, utilities, and electrical equipment integrators, the transformer can be specified according to the complete power system rather than treated as a standalone component.
Request a technical quotation for your 35kV PV, wind power, or energy storage transformer project.
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