Overview
QDTB® provides comprehensive power equipment solutions for solar photovoltaic installations, from utility-scale solar farms to distributed rooftop PV systems. Our PV-specific transformers and substations are engineered to handle the unique electrical characteristics of solar power generation, including harmonic distortion from inverters, variable loading patterns, and high ambient temperature operation in outdoor environments. With over 23 years of manufacturing expertise, we deliver reliable, efficient, and cost-effective power conversion solutions that maximize your solar energy yield.
PV-Optimized Design
Transformers specifically designed for solar applications with enhanced thermal management for high-ambient outdoor operation, rated for continuous duty in temperatures up to 55°C ambient.
Low Harmonic Distortion
Special winding configurations and derating factors that handle K-factor loads up to K-4, ensuring reliable operation with inverter-generated harmonics and minimal additional losses.
Environmental Safety
Natural ester (FR3) insulation fluid options for environmentally sensitive installations, providing fire-safe operation with biodegradable fluids that minimize environmental impact.
Integrated Protection
Complete protection and metering solutions integrated into box-type substations, including PV-specific relay protection, anti-islanding, and grid compliance monitoring.
Solar System Configurator
Size your solar array, storage and balance-of-system and get an instant bill of materials with P50/P75/P90 yield and full-cost LCOE.
Industry Context & Operational Characteristics
Solar photovoltaic power generation has become the core pillar of global clean energy transition, covering utility-scale ground power stations, distributed rooftop PV systems, industrial and commercial PV projects, and off-grid photovoltaic power supply scenarios. PV power generation features obvious intermittency, volatility and randomness affected by sunlight intensity, weather and seasonal changes. Power equipment for PV stations must adapt to long-term outdoor exposure, high-temperature operation and frequent grid fluctuation, with excellent harmonic resistance, thermal stability and low-loss performance to ensure efficient power generation and stable grid connection.
Key Operational Challenges
Power Distribution Architecture
PV module array → Combiner box → Inverter → PV step-up transformer → Grid-connected switchgear → Public power grid
Core Equipment Selection
PV Special Step-Up Oil-Immersed Transformers
Recommended Model: S13, S20 series outdoor fully sealed PV dedicated transformers
Core Configuration & Advantages
- Enhanced thermal design for high-ambient environments, adapting to long-term high-load operation of PV power stations in summer
- Low-harmonic winding configuration, perfectly matching inverter output characteristics and suppressing harmonic overheating
- Full-sealed corrugated oil tank structure, realizing rainproof, dustproof, anti-aging and maintenance-free outdoor operation
- Ultra-low no-load loss design, effectively reducing standby power consumption of PV stations and improving power generation efficiency
- Custom temperature rise and insulation grade upgrade for plateau, desert and coastal high-temperature scenarios
Applications: Utility-scale ground photovoltaic power stations, centralized agricultural and photovoltaic complementary projects.
Inverter-Duty Dry-Type Transformers
Recommended Model: SCB14, SCBH15 low-harmonic cast resin dry-type transformers
Core Configuration & Advantages
- Optimized winding structure for inverter-specific load, effectively filtering high-frequency harmonics and reducing equipment loss
- Flame-retardant, smoke-free and explosion-proof performance, suitable for indoor and distributed PV projects near buildings
- Compact structure and low-noise design, adapting to rooftop PV and industrial and commercial distributed power supply scenarios
- Strong short-circuit resistance and voltage impact resistance to cope with frequent PV power fluctuation
Applications: Rooftop distributed PV systems, factory building PV projects, small-scale commercial photovoltaic stations.
Amorphous Alloy Energy-Saving Transformers for PV
Recommended Model: SBH15/SBH21 series amorphous alloy transformers
Core Configuration & Advantages
- Ultra-low no-load loss, greatly reducing standby losses during non-power generation periods
- Specially designed for PV systems with intermittent operation characteristics
- Significantly improves the overall energy-saving benefit of photovoltaic power stations
- Shortens project investment return cycle through reduced operational costs
Applications: PV stations requiring maximum energy efficiency and low no-load loss operation.
Switchgear & Substation Selection
PV Combiner Boxes
Waterproof, dustproof and lightning-proof PV combiner boxes realize centralized collection of PV string current, with over-current, over-voltage and lightning protection functions, ensuring safe and stable current transmission of PV arrays.
PV Dedicated Box-Type Substation
ZGS/PV special integrated box substation integrates step-up transformation, grid-connected protection, metering and reactive power compensation functions. Factory pre-assembled and pre-tested, it supports rapid on-site installation of PV stations, adapts to outdoor harsh environments, and is the core grid-connected equipment for centralized PV power stations.
Grid-Connected Switchgear & Power Quality Equipment
KYN/XGN high-voltage grid-connected switchgears provide reliable switching and fault protection. CKSC series reactors and APF active filters suppress PV inverter harmonics and voltage flicker, stabilizing grid-connected power quality to fully meet international grid-connection standards.
PV Scenario Customized Enhancement
High-Temperature Resistance Upgrade
Enhanced heat dissipation structure and high-temperature resistant insulating materials for desert and tropical PV stations
Low-Harmonic Optimization
Special winding design to adapt to inverter nonlinear loads and reduce harmonic loss
Outdoor Anti-Aging Treatment
Multi-layer anti-corrosion and ultraviolet-proof coating for long-term outdoor exposure operation
Unattended Operation Adaptation
Equipped with temperature monitoring, oil level monitoring and remote fault early warning functions
Natural Ester Insulation Option
Environment-friendly natural ester insulating oil for ecological and scenic PV projects to improve fire safety and environmental protection performance
Power Quality Optimization
Massive inverter equipment in PV stations generates high-frequency harmonic pollution affecting grid power quality. We deploy CKSC series reactors and APF active filters to suppress PV inverter harmonics and voltage flicker, stabilizing grid-connected power quality to fully meet international grid-connection standards.
Key Benefits
Full PV Scenario Adaptation
Covers utility-scale centralized and distributed rooftop PV projects with targeted equipment matching
High Power Generation Efficiency
Low-loss and low-harmonic design maximizes clean power output and reduces operational loss
Extreme Outdoor Reliability
Anti-high temperature, anti-aging and weather-resistant design adapts to various harsh PV station environments
Stable Grid Connection Performance
Effectively suppresses PV power fluctuation and harmonic interference to ensure grid-safe operation
Low O&M Cost
Maintenance-free equipment design reduces long-term manual operation and maintenance investment for unattended PV stations
Technical specifications
| Capacity Range | 30 kVA - 3,150 kVA |
| Voltage Range | Up to 35kV / 0.27-0.8kV |
| Frequency | 50Hz / 60Hz |
| Insulation Class | F / H (155°C / 180°C) |
| Ambient Temperature | -25°C to +55°C (special: +65°C) |
| K-Factor Rating | K-1 to K-4 |
| Cooling | AN / AF (forced air optional) |
| Efficiency | Up to 99.2% (amorphous alloy) |
Standards Compliance
Applications
Related Products
Explore QDTB® product lines available for this solution
Oil Immersed Transformers
S13, S20 series outdoor fully sealed PV dedicated transformers for utility-scale solar farms
Dry Type Transformers
SCB14, SCBH15 low-harmonic cast resin dry-type transformers for rooftop and distributed PV
Amorphous Alloy Transformers
SBH15/SBH21 ultra-low no-load loss transformers for PV stations with intermittent operation
Box-Type Substations
ZGS/PV special integrated box substation with grid-connected protection and metering
Why Choose QDTB® for Solar PV Solutions
One-Stop Supply of Conventional & Solar Power Equipment
From power distribution system design to solar energy — transformers, switchgear, substations and solar equipment, sized and quoted in one place. Use our calculators to get a complete bill of materials and FOB price.