ZTelec Yuguang Electric manufactures high-performance Oil-Immersed PV Transformers from 30kVA to 31.5MVA with voltage ratings from 6kV to 38.5kV. Designed for solar power stations, utility-scale PV farms, and renewable energy projects, our transformer
As global renewable energy installations continue to expand, reliable power transformation has become essential for maximizing photovoltaic (PV) system efficiency. ZTelec Yuguang Electric manufactures high-performance Oil-Immersed PV Transformers specifically engineered for solar power plants, utility-scale photovoltaic projects, distributed solar systems, and renewable energy substations.
Designed in accordance with IEC 60076 standards, our PV transformers provide outstanding efficiency, excellent harmonic resistance, and long-term operational reliability, ensuring stable power transmission from photovoltaic inverters to the utility grid.
Whether integrated into pad-mounted substations, compact transformer substations, or installed as standalone units, our transformers help improve the safety, efficiency, and profitability of solar energy projects worldwide.
| Item | Specification |
|---|---|
| Product Name | Oil-Immersed PV Transformer |
| Rated Voltage | 6kV – 38.5kV |
| Rated Capacity | 50kVA – 31,500kVA |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN / ONAF |
| Insulation Class | Class A |
| Transformer Oil | Mineral Oil / FR3 Natural Ester Oil (Optional) |
| Vector Group | Dyn11, Yyn0 or Customized |
| Tap Changer | Off-Circuit / On-Load Tap Changer (OLTC) |
| Standards | IEC 60076, IEEE, ANSI, GB |
| Installation | Outdoor |
An Oil-Immersed PV Transformer, also known as a Solar Power Transformer, is a specialized distribution transformer used in photovoltaic power generation systems.
Its primary function is to increase the output voltage from photovoltaic inverters (typically 0.8kV, 10kV, or 35kV) to higher transmission voltages such as 35kV, 66kV, or 110kV, enabling efficient and stable connection to the utility grid.
Serving as the electrical bridge between the solar generation system and the transmission network, the transformer plays a critical role in minimizing power losses, improving energy conversion efficiency, and ensuring safe long-term operation.
Our Oil-Immersed PV Transformers are widely used in:
A photovoltaic transformer receives alternating current (AC) power from the PV inverter after solar panels convert sunlight into electricity.
Its primary functions include:
By efficiently transferring electrical energy from the solar plant to the utility network, the transformer ensures maximum energy output and reliable grid integration.
Different transformers are used throughout a solar power plant depending on the project size and electrical design.
| Transformer Type | Primary Application |
|---|---|
| Oil-Immersed PV Transformer | Utility-scale solar farms |
| Pad-Mounted Transformer | Compact photovoltaic substations |
| Dry-Type Transformer | Indoor commercial & industrial PV systems |
| Step-Up Power Transformer | High-voltage grid connection |
| Auxiliary Transformer | Plant auxiliary power supply |
Among these, the Oil-Immersed PV Transformer is the most commonly used solution for large-scale photovoltaic power stations because of its high efficiency, excellent cooling performance, and long service life.
Although they may appear similar, PV transformers are specifically engineered for renewable energy applications.
| PV Transformer | Distribution Transformer |
|---|---|
| Designed for photovoltaic systems | Designed for conventional power distribution |
| Handles harmonic-rich inverter loads | Designed for stable utility loads |
| Supports frequent load fluctuations | Operates under relatively constant loads |
| Enhanced overload capability | Standard overload performance |
| Optimized for renewable energy integration | General electrical distribution |
PV transformers also feature stronger thermal performance, improved harmonic resistance, and enhanced insulation systems to meet the demanding operating conditions of solar power plants.
Designed to operate reliably in high ambient temperatures, making it ideal for desert solar farms, tropical regions, and harsh outdoor environments.
Advanced winding design and superior insulation materials allow stable operation under fluctuating solar generation conditions.
Engineered specifically for photovoltaic inverter applications, effectively reducing the impact of harmonics and improving equipment lifespan.
Hermetically sealed tank design prevents moisture intrusion and oxidation, significantly extending transformer service life while reducing maintenance.
Low-loss silicon steel cores and optimized copper windings reduce no-load and load losses, improving overall system efficiency.
Designed for continuous outdoor operation with excellent short-circuit strength, mechanical stability, and thermal performance.
Selecting the right PV transformer depends on several technical factors.
Choose transformer capacity according to the total output power of the photovoltaic system.
Match the inverter output voltage with the required utility grid voltage.
Select ONAN or ONAF cooling depending on project size and environmental conditions.
Consider ambient temperature, altitude, humidity, dust levels, and corrosive environments.
Ensure compatibility with local utility regulations, fault levels, and voltage standards.
For projects using large central inverters, transformers should have enhanced harmonic resistance to improve system reliability.
Specifically designed to accommodate frequent load fluctuations and inverter-generated harmonics common in photovoltaic applications.
Premium magnetic core materials minimize energy losses and maximize power output.
High-quality insulation systems and strict manufacturing processes ensure reliable operation for over 30 years under proper maintenance.
Customized solutions are available for:
Manufactured according to international standards and suitable for projects across Europe, the Middle East, Africa, Southeast Asia, South America, and other global markets.
Every transformer undergoes rigorous quality control throughout production, including:
This ensures every transformer delivered meets international performance and safety requirements.
A high-quality photovoltaic transformer should comply with internationally recognized standards to ensure safety, reliability, and long-term performance.
Our Oil-Immersed PV Transformers can be manufactured in accordance with:
Additional project-specific certifications and testing can also be provided according to customer requirements.
Voltage configurations vary depending on project capacity and grid requirements.
| Typical Inverter Output Voltage | Common Medium-Voltage Collection Systems | Utility Grid Connection Voltage |
|---|---|---|
| 0.8kV | 10kV | 35kV |
| 10kV | 20kV | 66kV |
| 20kV | 35kV | 110kV |
| 35kV | 132kV | |
| 220kV |
For large utility-scale photovoltaic power plants, electricity is typically collected through medium-voltage networks before being stepped up to high-voltage transmission systems for long-distance power delivery.
With 68+ years of transformer manufacturing experience, ZTelec Yuguang Electric has supplied reliable power equipment to customers in more than 100 countries.
Our advantages include:
It is a transformer specifically designed for photovoltaic power stations that steps up inverter output voltage to transmission voltage for grid connection.
Our standard capacity ranges from 30kVA to 31.5MVA, with customized solutions available upon request.
Our products are manufactured according to IEC 60076, with IEEE, ANSI, and other international standards available depending on project requirements.
Yes. We offer customization for voltage, capacity, cooling method, tap changer, vector group, enclosure, environmental conditions, and project-specific requirements.
Absolutely. Our PV transformers are widely used in utility-scale solar projects, renewable energy substations, and large photovoltaic power plants.
ZTelec Yuguang Electric provides high-quality, customized transformer solutions for solar power projects worldwide. Contact our engineering team today for technical consultation, product selection, and competitive quotations.
