Photovoltaic grid-connected isolation transformer
Key attributes
| Brand | ROCKWILL |
| Model NO. | Photovoltaic grid-connected isolation transformer |
| Rated frequency | 50/60Hz |
| Rated capacity | 220kVA |
| Series | SGG |
Product descriptions from the supplier
Product Overview：
Photovoltaic power generation inverter isolation transformers play a critical role in systems that harness solar energy via the photovoltaic effect at semiconductor interfaces, where solar cells serve as the core components. These cells are encapsulated and connected in series to form large-area modules, which, when integrated with power controllers, constitute a complete photovoltaic power generation device.
Designed primarily for solar inverter systems, photovoltaic transformers require high-efficiency performance to compensate for inherent energy conversion losses in photovoltaic setups. Their grid-side wiring configurations, such as Dyn11 and YD5 phase shift transformers with 120° phase displacement, ensure stable grid interconnection. To minimize no-load energy losses, these isolation transformers are typically operated during daylight hours and shut down at night.
Below are reference parameters for three-phase photovoltaic transformers:
Key Features:
Electrical Safety Isolation：Designed to achieve complete electrical separation between the photovoltaic system and the grid, preventing direct current (DC) leakage and reducing risks of electric shock. It blocks grid-borne harmonics and surges, ensuring clean power transmission.
Efficient Grid Compatibility：Supports standard grid connection configurations (e.g., Dyn11, YD5 with 120° phase shift) to match grid voltage and frequency requirements. Enables stable power inversion from DC (solar panels) to AC (grid), with conversion efficiency ≥98% to minimize energy loss.
Harmonic Suppression & Waveform Purity：Integrates low-loss core materials (e.g., oriented silicon steel) and foil winding technology to suppress 3rd harmonic distortion and maintain sine-wave output. Ensures compliance with grid power quality standards (e.g., IEEE 519) for reliable grid interconnection.
Adaptive Operation & Energy Savings：Features automatic daytime activation and nighttime shutdown to eliminate no-load losses. Suitable for off-grid/on-grid systems, with customizable capacity (5kVA–1000kVA) to match solar array scales.
Robust Environmental Adaptability：Constructed with weather-resistant enclosures (e.g., 304 stainless steel) for outdoor installations, resisting humidity, temperature fluctuations, and corrosion. Dry-type air cooling design ensures maintenance-free operation in harsh environments.
Customizable Design Flexibility：Supports voltage customization (input/output: 220V–1140V) and insulation classes (B/F/H) for diverse project needs. Compact structure fits limited space in solar power stations, with optional IP certifications for enhanced protection.
Technical data：
Conditions of Use. Working environment temperature: 15~+50℃
Operating ambient temperature：20—90%RH
Atmospheric pressure in the working environment：860 hpa---1060 hp2
Storage/transport temperature：20℃-- +55℃
Main technical features:
Rated capacity：5KVA—1000KVA
Input Voltage: Rated voltage 270V or 315V
Input current by actual voltage
Output voltage: Rated voltage: 380V or 400V
The output current is based on the actual voltage
Connection mode ：dyn11
Efficiency ：≤98.5%
Frequency: 50HZ/60HZ
Insulation resistance ：25A less than 500MΩ
Induction withstand voltage ：125HZ/800y/60
Insulation Chip Class ：H (Temperature Resistance 180 °C)
Noise ：≤30dB)
Temperature rise： ≤ allows for a temperature rise of 115k
Impedance Voltage Drop ：≤4%
Structure: Forced air cooling, waiting for the temperature controller, according to customer requirements, reach a certain temperature, the fan will be automatically opened.
Degree of protection ：IP00
Anti-interference mode: copper foil isolation shielding grounding:
Waveform Distortion No additional waveform distortion.
Electrical strength: Power frequency sinusoidal voltage 3000V, which lasts for one minute, without breakdown and flashover
Insulation resistance (input and output to ground) Test voltage at least 1000V DC insulation resistance greater than 1000MΩ
Overload capacity Twice the rated current for one minute.
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