With the rapid global deployment of photovoltaic (PV) power plants, dry-type transformers have become indispensable core equipment in modern PV systems, thanks to their safety, environmental friendliness, and high efficiency. Xinhong Electrical focuses on providing dry-type transformer solutions for various PV scenarios, helping customers worldwide achieve stable grid connection and long-term returns.
After the DC power generated by PV modules is converted into AC power by inverters, the output voltage is usually low (e.g., 400V, 800V). A dry-type transformer steps up this voltage to medium voltage (e.g., 10kV, 35kV) or higher grid-connection levels, meeting utility access requirements. Accurate voltage matching is the prerequisite for stable power delivery from a PV plant to the grid.
Dry-type transformers provide reliable electrical isolation between the PV system and the utility grid. They effectively suppress zero-sequence currents, harmonics, and residual DC components generated by inverters, preventing them from contaminating the grid. Moreover, when a ground fault or short circuit occurs on the PV side, the transformer limits fault current, protecting downstream equipment such as inverters and switchgear, significantly reducing the risk of system damage.
PV power plants are often installed on rooftops, in deserts, along coastal tidal flats, or on mountains. Traditional oil-immersed transformers have risks of oil leakage and fire, requiring frequent maintenance. Dry-type transformers use epoxy resin vacuum-cast insulation – completely oil-free – fundamentally eliminating oil leakage and fire hazards. Their resistance to high temperatures, humidity, and salt spray enables reliable operation over a wide temperature range from -25°C to +50°C, making them especially suitable for outdoor distributed or centralized PV projects. Xinhong Electrical dry-type transformers offer high protection ratings (e.g., IP20, IP23), greatly reducing on-site maintenance work.
The life-cycle power generation of a PV plant directly affects investment returns. Dry-type transformers employ high-permeability silicon steel and high-quality copper windings, achieving no-load and load losses that are better than IEC or IEEE standards. Lower heat generation means higher power transmission efficiency, thus improving the overall generation efficiency of the plant. For plants with an operational life of over 20 years, selecting high-efficiency dry-type transformers can bring significant incremental returns.
Modern dry-type transformers can be equipped with built-in temperature controllers, PT100 sensors, and communication modules to monitor winding temperature, load rate, and operating status in real time. Via Modbus, RS485, or Ethernet interfaces, data can be integrated into the plant’s SCADA system or cloud platform. Xinhong Electrical smart dry-type transformers support remote alarms and predictive maintenance, helping O&M teams promptly detect anomalies such as overtemperature or overload, enabling unattended or minimally attended modern management modes.
Dry-type transformers play five key roles in photovoltaic power plants: voltage transformation, electrical isolation, safety protection, efficiency optimization, and smart O&M. Choosing a high-quality dry-type transformer is an important decision to ensure plant safety, increase power generation revenue, and reduce life-cycle costs. Xinhong Electrical continues to provide trustworthy dry-type transformer products and technical support for PV projects worldwide through innovative technology and reliable workmanship.
