Project Background

Zhenda Farm is located in Gangnan District, Guigang City, Guangxi. To reduce electricity costs and achieve clean energy transition, a 1.92MW distributed photovoltaic system has been constructed on the farm’s roof. The project requires stepping up the voltage output by the photovoltaic inverter from 0.4kV to 10kV for grid connection. The grid-connected equipment must occupy little space, allow fast construction, adapt to the farm’s high-temperature and high-humidity environment, and meet the grid’s safe connection standards.

Customer Pain Points

Tight land resources: The farm’s production areas are densely distributed; traditional substations require independent civil construction, occupying production space.

High demand for grid-connection reliability: The grid connection point must have rapid fault detection and "four remote functions" to ensure grid safety.

Poor environmental adaptability: There is a risk of ammonia corrosion around the farm, and ordinary box-type substations have insufficient protection class.

Tight construction schedule: Installation must be completed quickly during gaps in breeding operations to minimize production suspension losses.

Solution Proposition

Three-in-one integrated structure

Integrated design of high-voltage switch + transformer + low-voltage equipment, eliminating the need for independent prefabricated cabins and cable trench civil construction, and reducing foundation costs.

Special protection for breeding environment

Adopts 304 stainless steel enclosure (optional material) and achieves IP54 protection class through a honeycomb double-layer structure, resisting high temperature, high humidity, and mild corrosive gases.

Intelligent grid-connection management

The high-voltage ring main unit is pre-installed with a Feeder Terminal Unit (FTU), supporting short-circuit/single-phase ground fault detection and featuring four remote functions (remote measurement, remote signaling, remote control, remote regulation) to meet grid dispatching requirements.

Modular rapid deployment

The entire station undergoes factory pre-installation and commissioning; after on-site hoisting and positioning, grid connection is completed efficiently.

Customer Value

Investment and space savings

Elimination of the secondary equipment cabin reduces civil construction area and directly lowers construction costs;

Compact design adapts to the narrow space around the farm’s roof.

Uncompromised grid-connection safety

The high-voltage side uses a vacuum circuit breaker (ZN28 type optional);

The low-voltage side is equipped with an intelligent reactive power compensation device to avoid grid penalties.

Exclusive adaptation to breeding scenarios

Enclosure temperature rise is controlled within ≤40K (in line with Chinese National Standard GB/T 17467), ensuring continuous operation at an ambient temperature of 35℃;

The dustproof and moisture-proof design has passed the damp heat test specified in GB/T 20645-2006.

Efficient whole-life-cycle operation and maintenance

The low-voltage side can support up to 30 outgoing circuits, with reserved interfaces for breeding equipment capacity expansion;

The FTU supports remote monitoring, reducing the frequency of on-site inspections.