Transformer substation box-type transformer and distirbution transformer

The distribution transformer serves as the ‘heart’ of the box-type substation, functioning as the core device for voltage conversion and power distribution.

Detailed Introduction:
Project Background: Green Transformation of Lingang Factory Buildings
Qingdao Haifa Environmental Energy Investment Co., Ltd. (Honghai Green Energy) has invested in the construction of a 1.73MW distributed photovoltaic power station, relying on the factory building resources in the Jiaozhou Bay Port Industrial Zone. The project adopts the full grid connection mode, aiming to maximize the utilization of 32,000 square meters of color steel tile roof resources. It is expected to deliver an average of 1.95 million kilowatt-hours of clean electricity annually, equivalent to reducing 1,530 tons of carbon dioxide emissions. In response to environmental challenges such as high humidity and salt fog corrosion along the coast, the project team has adopted a 2000KVA step-up transformer box + prefabricated cabin integrated design to achieve efficient grid connection and long-term stable operation.

Core challenge: The grid connection technology competition in the coastal environment
Power quality control: The power grid capacity in the factory is limited, and it is necessary to suppress the voltage flicker caused by the fluctuations of photovoltaic power.
Space limitation: The roof load requirements call for lightweight equipment, and traditional civil engineering substation structures cannot be installed on the ground.
Operation and maintenance efficiency: The coastal salt spray environment accelerates equipment corrosion, and the failure rate of the traditional solution is relatively high.
Technical solution: Customized design integrating three functions

1.Boosted and Grid-connected Integrated Cabin | 30-day Rapid Delivery

2000KVA double-split winding box transformer: Suitable for sudden changes in irradiation in the morning and evening, reducing copper loss by 18%.
Integrated design of prefabricated compartments: High and low voltage cabinets, metering devices and monitoring systems are pre-installed inside the compartments.
Upgrade of coastal protection: The box body is coated with C5 anti-corrosion paint, and the internal humidity is controlled below 30% RH.

2. SVG Dynamic Reactive Power Compensation | Voltage Compliance Rate 100%

Configure a 6Mvar SVG device to adjust the power factor in real time (≥ 0.99);
Suppress the 3rd/5th/7th harmonic (THDi < 3%), avoiding penalties from the power grid assessment;
The modular design enables later expansion and reserves energy storage interfaces.

3. Intelligent Operation and Maintenance System | Unattended + Remote Diagnosis

4G/fiber optic dual-channel data transmission, allowing users to view power generation volume and equipment status on their mobile devices.
Automatically generate the “Grid Connection Compliance Report” and match the acceptance standards of State Grid Shandong.
Salt spray corrosion warning function: It alerts for the inspection of anti-corrosion coatings three months in advance.
Outcome data: Validation of the value of full internet access mode
Indicator Traditional Solution Project Outcome Enhancement Effect
Annual power generation: 1.78 million kilowatt-hours, 1.95 million kilowatt-hours (+9.5%)
Operation and maintenance cost: 8.2 yuan/kW·year 5.6 yuan/kW·year -31.7%
Voltage qualification rate: 97.3% 100% – Penalty for assessment has been reset to zero.
Investment payback period: 6.8 years vs. 5.9 years, a reduction of 13.2%
Customer Testimonial
“From the scheme design to the grid connection acceptance, it only took 4 months. The prefabricated cabin scheme saved 200 square meters of land. The SVG equipment enabled the grid acceptance to pass in one go. Since the project was put into operation, there has been zero failure, far exceeding the expected returns!”
— The project manager of Qingdao Haifa Environmental Energy Project

Project Highlights: Replicable Coastal Solar Power Model
Lightweight design: The total weight of the box transformer and prefabricated cabin is less than 8 tons, suitable for the load of color steel roof.
Environmental adaptability: C5 anti-corrosion + IP65 protection, passed the Qingdao marine atmospheric corrosion test;
Grid-friendly feature: SVG + active filtering technology, meeting the anti-islanding requirements of the Shandong power grid.