Photovoltaic/Wind power/Energy storage transformer

New energy substations are power conversion and distribution equipment specially designed for new energy power generation systems. They are mainly used to convert low-voltage alternating current generated by new energy power generation systems into medium-voltage or high-voltage alternating current, and feed electric power into the public grid.They are widely applied in the construction and renovation of 10~110kV small and medium-sized substations and distribution stations, industrial & mining facilities, and mobile operation substations for petroleum, chemical industry, drilling platforms, urban and rural areas.This product features intelligent operation, energy conservation & environmental protection, excellent electrical performance and innovative structural design.

35kV Oil-Immersed Three-Phase Double-Winding Non-Exciting Voltage Regulation New Energy Generation Side for Photovoltaic, Wind Power, Energy Storage Transformers

10kV Oil-Immersed Three-Phase Double-Winding Non-Exciting Voltage Regulation New Energy Generation Side for Photovoltaic, Wind Power, Energy Storage Transformers

FAQs

1. How do transformers handle severe harmonics and distorted waveforms caused by high-frequency inverter outputs in photovoltaic power generation and energy storage systems?

• Answer: Renewable energy inverters and power conversion systems (PCS) generate significant high-order harmonics, causing extra stray losses and localized overheating in transformers. To address this, transformers must incorporate anti-harmonic designs (such as optimized foil winding structures and electromagnetic designs that minimize stray eddy current losses), undergo proper capacity derating during selection, or utilize special transformers complying with specific K-factor standards.

2. How do step-up transformers in photovoltaic and energy storage systems (ESS) adapt to extreme ambient temperatures, wide diurnal temperature swings, and intense outdoor solar radiation?

• Answer: Renewable energy plants are often located in deserts, gobis, or high-altitude regions with extreme temperature fluctuations and intense solar radiation. Transformers must use high-grade insulation systems adaptable to wide temperature ranges (such as Class H insulation), feature advanced UV-resistant anti-corrosion coatings on enclosures and cooling fins, and maintain sufficient thermal margins in design to prevent thermal breakdown under full load and extreme heat.

3. How do dual-secondary or multi-winding transformers safely coordinate with multiple power conversion systems (PCS) in large-scale battery energy storage systems (BESS)?

• Answer: Energy storage plants frequently employ multi-winding transformers (such as dual-secondary transformers) to connect multiple independent or parallel PCS units simultaneously. Transformer designs must possess exceptional short-circuit impedance matching and symmetry to isolate circulating current interference between different converters, withstand strong electrodynamic shock forces during single-side short-circuit faults, and ensure electrical isolation and stability across multiple branches.

4. How do tower-base or nacelle transformers used in wind power generation overcome strict spatial constraints and long-term continuous mechanical vibrations?

• Answer: The interior space of wind turbine generators is extremely limited, and blade rotation generates high-frequency, continuous mechanical vibrations and oscillations. Wind-specific transformers must adopt compact structural designs while applying reinforced seismic resistance and multi-point soft-connection fixation to cores, coils, and internal clamping components to prevent fastener loosening, wire chafing, or internal short circuits under prolonged alternating mechanical stress.

5. What special protections are adopted by step-up transformers in offshore wind farms to combat extreme salt spray, humidity, and marine atmospheric corrosion?

• Answer: The marine environment's salt spray and humidity are highly corrosive. Offshore wind transformers typically utilize hermetically sealed stainless steel (e.g., 316L) enclosures or heavy-duty anti-corrosion coating systems meeting C5-M very high durability classes. Additionally, all electrical terminals, bushing creepage distances, and sealing gaskets undergo special anti-marine-growth, anti-condensation, and anti-salt-penetration designs to ensure maintenance-free or low-maintenance operation over a 25-year design life.

6. How do photovoltaic step-up transformers prevent thermal fatigue and insulation aging when subjected to frequent and drastic load fluctuations caused by day-night cycles and sudden solar irradiance changes (e.g., cloud cover)?

• Answer: PV generation is heavily weather-dependent, causing output power to fluctuate drastically in short periods, which subjects transformer windings to frequent thermal-mechanical cycles and sudden temperature shifts. Premium transformers strictly control hot-spot temperature rises during material selection and thermal design, utilizing high-mechanical-strength conductors and elastic compression structures to resist thermal expansion/contraction stresses and delay fatigue aging of insulation materials.

7. How do transformers in renewable energy plants withstand transient massive short-circuit current surges during grid low-voltage ride-through (LVRT / fault ride-through) events?

• Answer: When a grid fault triggers low-voltage ride-through, transformers must endure short-circuit fault currents several times their rated current within a brief timeframe. This requires transformer cores and windings to possess exceptional electromechanical axial and radial stability, with winding inter-turn insulation and mechanical support structures rigorously verified via short-circuit dynamics simulation to prevent winding deformation or disk displacement.

8. What are the advantages and technical considerations of using eco-friendly natural or synthetic ester oils (such as FR3) in large-scale PV and energy storage pad-mounted transformers?

• Answer: Ester insulating fluids feature high flash points (typically exceeding 300°C), superior fire safety, and complete biodegradability. In ecologically sensitive zones or large BESS applications, ester-filled transformers significantly reduce fire and explosion risks, preventing groundwater contamination even if the tank is breached. Due to their higher viscosity, technical considerations require optimizing cooling channels and efficiency to ensure proper fluid circulation and heat dissipation across high and low temperature ranges.

9. How should the ventilation, cooling, and dust-proof systems of PV and energy storage pad-mounted transformers be designed when operating in dusty, sandy, high-temperature desertified regions?

• Answer: Desert regions face year-round sandstorms and extreme heat. For pad-mounted transformers utilizing forced air cooling or natural ventilation, efficient multi-stage dust-proof louvers, replaceable sand-filters, or totally enclosed external circulation heat exchangers (such as oil-to-air coolers with IP55 protection ratings) must be engineered to prevent fine sand and dust from entering electrical compartments, which causes leakage tracking, short circuits, or clogged cooling pathways.

10. How do transformers handle frequent asymmetric loads and DC bias issues in renewable energy microgrids and off-grid / islanding operation modes?

• Answer: In microgrid or off-grid operation environments, partial non-linear loads or control deviations can easily generate asymmetric three-phase loads and trace DC component injections (DC bias). This causes rapid core half-saturation, surging no-load losses, and abnormal increases in vibration and noise. Transformer designs must appropriately increase magnetic flux density margins, optimize core lamination joints, and enhance DC bias resistance to maintain stable power supply during islanding modes.