Power Transformer and Substation for New Energy Generation

SOLAR POWER / ENERGY POWER / CHARGING PILES

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01 Introduction

Reliable Solar Transformer Solutions for Photovoltaic Power Systems

A solar PV transformer is a key power conversion device used in photovoltaic systems to step up inverter output voltage and connect solar generation to the utility grid safely and efficiently.

In solar farms, commercial PV projects, and solar-plus-storage applications, the right transformer solution helps improve grid connection performance, support stable outdoor operation, and adapt to different environmental and installation requirements.

Bidirectional Operation

Adapting to the bidirectional energy flow characteristics of photovoltaic energy storage and charging systems, thereby improving the overall efficiency of the system;

Power Quality Management

Solve harmonic pollution from photovoltaic/energy storage inverters and ensure the safety of power grids and electrical equipment;

Full-scene Adaptation

To meet the deployment needs of different markets and environments around the world and reduce total lifecycle costs;

Environmental Protection and Safety

Natural ester oil or epoxy resin insulation meets market environmental regulations and is suitable for the high safety requirements of urban charging stations.

02 Application Scenario

Scenario-based

transformer technology

RENEWABLE ENERGY SOURCES OFFER NUMEROUS ADVANTAGES

THAT CONTRIBUTE TO A SUSTAINABLE AND THRIVING FUTURE

FOR OUR PLANET HRIVING FUTURE FOR OUR PLANET.

Solar PV

Photovoltaic inverter integration: Integrated with centralized inverters or string inverters

Boost function: Boosts the inverter output from 0.4kV/0.69kV to 11kV/33kV for grid connection

Typical configuration:

Capacity: 1000kVA ~ 3500kVA

Voltage: 0.69kV/11kV or 0.4kV/33kV

Energy Storage

PCS (Power Supply System) Support: Connects the battery system to the power grid.

Isolation Boost: Achieves electrical isolation and voltage conversion between the low-voltage DC battery system and the medium-voltage power grid.

Features: Must withstand frequent charge-discharge cycles.

Charging Pile

Charging station accessories: Provides power conversion and isolation for DC fast charging stations.

Advantages: Compact design suitable for urban charging station space constraints.

OUR PRODUCTS

1.Oil type Compact Substation

Item	Typical Specifications
Capacity	1000kVA ~ 2500kVA
High Voltage	11kV, 20kV, 22kV, 33kV
Low Voltage	0.4kV (400V), 0.69kV (690V)
Transformer Type	Oil-immersed Transformer
Structure Type	European-style Compact Substation / Containerized Pre-fabricated Cabin
Protection Class	IP55 (Enclosure), IP65 (Transformer)
Cooling Method	ONAN, ONAF
Noise Level	Noise <55dB
Smart System	IEC 61850 ed2.0, PRP Redundant Network
Certifications/Standards	CE, TÜV, VDE, RoHS, IEC, AS60076
Application Market	PV / Energy Storage / EV Charging Station

Product Features
Compact design, saves 30% space
High redundancy design, adapts to fluctuating loads, matches large PV inverters
Natural ester oil (vegetable oil) optional
Suitable for residential areas, low noise design
Digital integration, remote monitoring
Carbon footprint certified, CBAM compliant
180°C temperature resistant, C5-M marine anti-corrosion
Double-layer roof ventilation, UV-resistant coating
Full-link certification, model validation
4G remote monitoring, predictive maintenance
K3 fire protection rating

Limited land availability, stringent environmental regulations (SF6 restrictions), proximity to residential areas, and complex grid connection standards.

High entry barriers, harsh environment (high temperature/high salt spray), many off-grid applications, and mandatory SAA certification.

Market Characteristics (Europe)

Market Characteristics (Australia)

2.Dry Type Compact Substation

Item	Typical Specifications
Capacity	3000kVA ~ 5000kVA
High Voltage	11kV, 20kV, 22kV, 33kV
Low Voltage	0.4kV (400V), 0.69kV (690V)
Transformer Type	Epoxy resin dry-type transformer
Structure Type	European-style Compact Substation / Containerized Pre-fabricated Cabin
Protection Class	IP55 (Enclosure), IP65 (Transformer)
Cooling Method	AN/AF
Noise Level	Noise <55dB
Smart System	IEC 61850 ed2.0, PRP Redundant Network
Certifications/Standards	CE, TÜV, VDE, RoHS, IEC, AS60076
Application Market	PV / Energy Storage / EV Charging Station

Product Features
Dual-split design to match PCS load characteristics
Epoxy resin casting, vacuum pressure impregnation (VPI) process
Complies with standard energy storage cabinet dimensions for easy integration
Suppresses PCS charging and discharging surge current, extending battery life by 20%
Improves three-phase imbalance, enhancing power supply reliability
Supports bidirectional power flow for grid-connected photovoltaic power generation and energy storage charging
K13/K20 rating, resistant to inverter harmonics
IP55 protection, resistant to high temperature, high humidity, and dust.

High-temperature desert environment, weak power grid, cost sensitivity, CoC customs clearance certification, long project cycle

Market Characteristics (Middle East)

3.Pad Mounted Transformer

Item	Typical Specifications
Capacity	1500kVA ~ 2500kVA
High Voltage	13.2kV, 13.8kV, 24.9kV, 34.5kV
Low Voltage	0.4kV (480V), 0.277kV (277V)
Transformer Type	Fully sealed oil-immersed transformer
Structure Type	American-style transformer substation
Protection Class	NEMA3R
Cooling Method	ONAN, ONAF
Noise Level	Noise <55dB
Certifications/Standards	UL 5085,CSA C22.2, ETL, FCC, IEEE C57.12.00
Application Market	PV / Energy Storage / EV Charging Station

Product Features
1. High-capacity centralized charging, supports supercharging stations;
2. UL5085 certified, anti-harmonic design (K13/K20);
3. Buried or above-ground type, anti-theft design;
4. Aluminum alloy or galvanized steel casing, UV resistant;
5. Supports grid connection, plug and play;
6. Natural ester oil (vegetable oil) optional;

UL mandatory certification, complex power grid structure (480V/277V), VPP virtual power plant mode, high installation costs

Market Characteristics (North America)

4.Oil-immersed Distribution Transformer

Item	Typical Specifications
Capacity	630kVA ~ 2500kVA
High Voltage	6.6kV, 11kV, 22kV, 33kV
Low Voltage	0.4kV (400V)
Transformer Type	Oil-immersed Transformer
Structure Type	Fully Sealed Integrated
Insulation Medium	Mineral oil or Natural Ester (FR3 Vegetable Oil)
Protection Class	C4/C5 Anti-corrosion, Sand-proof
Cooling Method	ONAN
Environmental Adaptation	Temperature -25°C ~ +55°C
Certifications/Standards	TISI, SNI, ST, COA, IEC
Application Market	PV / Energy Storage / EV Charging Station

Product Features
Anti-corrosion, anti-mold
Steel plate welding, dust and moisture proof
Enhanced heat dissipation, sand-proof design
Anti-condensation, salt spray resistant (coastal)
Maintenance-free design, humid and hot climate adaptation
OEM/ODM support, technical training

Cost-sensitive, hot and humid environment (tropical), unstable power grid, gradually improving standards, acceptance of IEC CB certification conversion

Market Characteristics (Southeast Asia)

5.Oil-immersed Power Transformer

Item	Typical Specifications
Capacity	3MVA ~ 25MVA
High Voltage	11kV, 33kV, 66kV
Low Voltage	3.3kV, 6.6kV, 11kV
Transformer Type	Oil-immersed Transformer
Structure Type	With oil pillow
Insulation Medium	Mineral oil or Natural Ester (FR3 Vegetable Oil)
Protection Class	IP65
Cooling Method	ONAN/ONAF
Intelligent System	Basic temperature control + remote monitoring (optional)
Environmental Adaptation	Humidity ≤95%/day, temperature -25°C to +50°C
Certifications/Standards	SASO, CoC Compliance Certification, IEC 60076
Application Market	PV / Energy Storage / EV Charging Station

Product Features
High-voltage side high insulation level design;
Natural ester oil (fire retardant);
PCB-free mineral oil for strong heat dissipation;
Reinforced heat sink, simplified dust filter design, reducing failure points for long-term outdoor use.

High-temperature desert environment, weak power grid, cost sensitivity, CoC customs clearance certification, long project cycle

Market Characteristics (Middle East)

04 Articles & Blogs

Renewable energy

innovations and insights.

March 13, 2026

Transformers in PV-Storage-Charging Integrated Projects: Architecture, Solutions, And Selection Guide

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Special technical requirements:

1. Power Quality Requirements

Harmonic Suppression: Charging piles and PCS generate harmonics; transformers must have high impedance or matching filtering devices.

DC Bias Tolerance: Prevent DC bias saturation caused by geomagnetic storms or inverter failures.

2. Operational Characteristics Requirements

Frequent Start-Stop Adaptability: The photovoltaic-storage-charging system experiences large load fluctuations, requiring the transformer to withstand frequent impacts.

Wide Load Range and High Efficiency: Maintaining high efficiency (meeting energy efficiency standards) within a 20%-100% load range.

3. Protection Configuration

Temperature Monitoring (Dry type: PT100/fiber optic temperature measurement; Oil immersion: oil temperature + winding temperature)

Gas Protection (Oil Immersion)

Pressure Relief Device

05 FAQ

FAQ for Solar Transformer

Get the Right Solar Transformer Solution for Your Project

1.What transformer is used in solar power plants?

Solar power plants typically use step-up transformers, pad-mounted transformers, or compact substations to raise inverter output voltage to the required grid connection level.

2.What is a PV transformer?

3.How do I choose a transformer for a solar farm?

4.Pad-mounted transformer vs compact substation: which is better?

5.Can solar transformers be customized?

6.Are your transformer solutions suitable for harsh environments?

7.Do you support utility-scale and overseas solar projects?

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Be a Part of the

Global Movement

The core trend of photovoltaic-storage-charging transformer solutions is high integration, high intelligence, high energy efficiency, and high compatibility. By optimizing transformer configuration, system costs can be significantly reduced, operating efficiency can be improved, and synergistic optimization of photovoltaic, energy storage, and charging operations can be achieved.

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