• Photovoltaic grid-connected isolation transformer
Photovoltaic grid-connected isolation transformer
discuss personally
Model
SGG-220kVA
SGG-180kVA
Basic info
Brand ROCKWILL
Model NO. Photovoltaic grid-connected isolation transformer
Rated frequency 50/60Hz
Rated capacity 220kVA
Series SGG
Product Detail

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.

Know your supplier
ROCKWILL
Rockwill Electric Group Global Manufacturer of High voltage and medium-voltage power equipment and smart grid solutions. Headquartered in Wenzhou, China. Serving 100+ countries with quality, innovation, and trust. What We Offer: • HV-MV switchgear (VCB, SF₆ circuit breakers, RMU, GIS) • Distribution transformers and substations • Smart grid and monitoring systems • Solar, wind, EV charging, and energy storage solutions • EPC turnkey power projects Certified: ISO 9001 / ISO 14001 / ISO 45001
Main Categories
High Voltage Electrical Apparatus
Business Type
Design/Manufacture/Sales
Highest Annual Export (USD)
$150,000,000
Professional Experience
16 years
Workplace
108000m²m²
占位
占位
Related Products
Related Knowledges
Cost Differences and Performance Comparison of 35kV New Energy Transformers Based on Dry-Type, Mineral Oil, and Vegetable Oil
Cost Differences and Performance Comparison of 35kV New Energy Transformers Based on Dry-Type, Mineral Oil, and Vegetable Oil
For users, when purchasing a 35kV new energy transformer, choosing between dry-type, mineral oil-filled, or vegetable oil-filled types involves multiple considerations. These include user habits, maintenance-free performance, safety and fire resistance, volume and weight, among others. However, cost differences are undoubtedly one of the most crucial factors.To illustrate the issue intuitively, this paper selects a three-level energy efficiency dual-winding new energy transformer with a rated ca
Ron
07/26/2025
What is the connection group of a transformer?
What is the connection group of a transformer?
Transformer Connection GroupThe connection group of a transformer refers to the phase difference between the primary and secondary voltages or currents. It is determined by the winding directions of the primary and secondary coils, the labeling of their start and end terminals, and the connection mode. Expressed in a clock-like format, there are 12 groups in total, numbered from 0 to 11.The DC method is commonly used to measure the transformer's connection group, mainly to verify whether the con
Vziman
07/26/2025
Working Voltage in Power System
Working Voltage in Power System
Working VoltageThe term "working voltage" refers to the maximum voltage that a device can withstand without sustaining damage or burning out, while ensuring the reliability, safety, and proper operation of both the device and associated circuits.For long-distance power transmission, the use of high voltage is advantageous. In AC systems, maintaining a load power factor as close to unity as possible is also economically necessary. Practically, heavy currents are more challenging to handle than hi
Encyclopedia
07/26/2025
What is Steady State Stability in Power System?
What is Steady State Stability in Power System?
Definition of Steady State StabilitySteady state stability is defined as the capability of an electric power system to sustain its initial operating condition following a small disturbance, or to converge to a state closely approximating the initial condition when the disturbance persists. This concept holds critical significance in power system planning and design, the development of specialized automatic control devices, the commissioning of new system components, and the adjustment of operati
Edwiin
07/26/2025
What is the sequence for powering down the transformer?
What is the sequence for powering down the transformer?
The sequence for shutting down a main transformer is as follows: when de-energizing, the load side should be shut down first, followed by the power supply side. For energizing operations, the reverse order applies: the power supply side is energized first, then the load side. This is because: Energizing from the power supply side to the load side makes it easier to identify the fault range and take prompt judgment and handling measures in case of a fault, preventing the fault from spreading or e
Rockwell
07/26/2025
What are the methods for switching operations of station transformers?
What are the methods for switching operations of station transformers?
Let's take an auxiliary power system with two station transformers as an example. When one station transformer needs to be out of service, there are two operation methods: non-interruptive power supply and instantaneous power interruption. Generally, the method of instantaneous power interruption on the low-voltage side is preferred.The operation method for instantaneous power interruption on the low-voltage side is as follows:Open the 380V power incoming circuit breaker of the corresponding sec
Vziman
07/26/2025
×
Inquiry
Download
IEE-Business is dedicated to serving the personnel in the global power industry.
Join IEE-Business, not only can you discover power equipment and power knowledge, but also canhnd like - minded friends!