1. The photovoltaic prefabricated cabin substation is pre-installed with integrated step-up power distribution equipment in a photovoltaic-specific factory. It is suitable for ground photovoltaic power stations, mountain photovoltaics, and industrial and commercial large-scale photovoltaic energy storage project scenarios. 2. The rated voltage of the high-voltage side is 7.2-40.5kV, the low-voltage side is AC0.4kV, 50/60Hz; the supporting step-up transformer capacity is 500kVA-6300kVA. 3. The cabin is made of steel plate/aluminum alloy welded box, which integrates photovoltaic grid cabinet, step-up transformer, high and low voltage cabinet, reactive power compensation and monitoring system, with independent compartment separation, protection grade IP54, and complies with GB/T 17467 standard. 4. Each cabinet in the cabin is equipped with a complete five-proof interlock as standard, equipped with lighting, ventilation, fire protection, temperature and humidity control, emergency locking devices, and multiple safety protections. 5. The factory has completed the pre-installation and pre-debugging of the whole machine, and only wiring is needed on site, which greatly shortens the construction period of the photovoltaic project and has the ability to prevent rain, theft, and small animal invasion. 6. Modular integrated design, grid connection, voltage boost, compensation, and monitoring function modules can be freely combined. 7. The cabin size and one-time solution can be customized according to the site terrain and power grid requirements, and support the expansion of power quality monitoring, fault location, and remote SCADA monitoring modules. 8. Provide a full set of CCC and type test reports, technical drawings, basic hoisting drawings, grid connection acceptance guidance, remote after-sales support and OEM customization services.

PV Prefabricated Substation for Solar Farms — Factory-Built, Fast-Deploy Power Solution

DSY Switchgear's PV Prefabricated Substation is a factory-assembled, all-in-one power conversion system built specifically for photovoltaic power plants. It integrates a step-up transformer (500kVA–6300kVA), high-voltage switchgear, low-voltage distribution panels, reactive power compensation, and a monitoring system into a single IP54-rated enclosure. The high-voltage side supports 7.2kV–40.5kV, while the low-voltage side operates at AC 0.4kV, 50/60Hz. Compliant with GB/T 17467, IEC 62271, and related standards, it is pre-installed and pre-debugged at the factory — only basic on-site wiring is required to bring the system online.

What Makes This Substation Different From Conventional Designs

Traditional site-built substations demand long construction timelines, skilled on-site labor, and complex commissioning. Every component is assembled in the field, which introduces risks of mismatching, insulation inconsistency, and weather-related delays.

DSY's photovoltaic cabin substation solves these problems by completing the entire pre-installation and pre-debugging process at the factory. When your unit arrives on site, you only need to connect the cables and power up. This approach cuts construction time dramatically — by more than 80% compared to conventional builds.

The steel plate or aluminum alloy welded box structure uses independent compartment separation. Each functional zone — grid-connected cabinet, transformer, high/low voltage switchgear, and monitoring system — is isolated from the others. This design improves safety, simplifies maintenance, and prevents cross-compartment faults.

Product Applications

Technical Specifications

Parameter	Specification
Rated Voltage (HV Side)	7.2kV – 40.5kV
Rated Voltage (LV Side)	AC 0.4kV
Rated Frequency	50Hz / 60Hz
Step-Up Transformer Capacity	500kVA – 6300kVA
Cabin Protection Level	IP43 / IP54
Enclosure Material	Steel plate / Aluminum alloy welded box
Core Configuration	PV grid-connected cabinet, step-up transformer, HV/LV switchgear, reactive power compensation, monitoring system
Standards Compliance	GB/T 17467, IEC 62271, GB/T 11022, GB 7251.3, GB/T 18216.1

Certifications

Key Features and Safety Configuration

In the PV Prefabricated Substation, every cabinet inside the cabin comes standard with a complete five-proof interlock system. This means each switching operation is protected against accidental misoperation across all linked components.

Beyond interlocking, each unit is equipped with:

Lighting and ventilation for routine inspection and thermal regulation
Fire protection systems integrated into the cabin structure
Temperature and humidity control to maintain safe operating conditions in varying climates
Emergency locking devices to restrict unauthorized access during faults or maintenance

The enclosure reaches IP54 protection, resisting dust ingress and water splashing from any direction. It also defends against small animal intrusion and unauthorized entry — critical for unmanned remote sites.

Application Scenarios

This substation is engineered for demanding outdoor photovoltaic environments where reliability, speed of deployment, and minimal maintenance matter most.

Ground-mounted utility-scale PV stations benefit from the compact footprint and pre-tested integration. Remote desert or grassland sites especially gain from the reduced on-site labor requirement.

Mountain and complex terrain photovoltaic projects require equipment that can be transported, positioned, and commissioned quickly. The modular cabin design allows flexible siting and crane-assisted installation without on-site civil construction delays.

Industrial and commercial large-scale PV and energy storage projects often have space constraints and stricter local regulations. The structured compartment layout and aesthetic enclosure design fit these environments while meeting fire safety and noise requirements.

For floating PV or coastal installations, the aluminum alloy enclosure option combined with IP54 sealing provides enhanced resistance to humidity and salt-laden air.

Modular Design and Customization Options

You can configure this system exactly to your project requirements. The modular architecture allows you to combine grid connection, voltage boost, reactive power compensation, and monitoring functions independently — adding only what your power plant needs.

Cabin dimensions and primary electrical diagrams can be tailored to match your specific site terrain and local grid connection standards. You are not locked into a fixed layout.

Expansion modules available include:

Power quality monitoring for real-time waveform analysis
Fault location systems to speed up post-fault recovery
Remote SCADA monitoring via IEC 60870-5-104 or Modbus TCP protocols, enabling centralized O&M from any location

OEM customization and white-label configurations are also supported for system integrators and EPC contractors.

Quality Assurance and Documentation

Every unit ships with a full set of CCC certification and type test reports. Type tests cover temperature rise testing, dielectric insulation verification, and partial discharge detection — confirming that insulation performance holds under real peak solar load conditions.

DSY also provides complete technical drawings, foundation and hoisting diagrams, and grid connection acceptance guidance. This documentation package gives your engineering and commissioning teams everything needed to prepare the site and pass utility acceptance smoothly.

Factory Acceptance Testing (FAT) is conducted before shipment to verify protection relay accuracy, SCADA communication integration, and the functional status of all safety interlocks.

Packaging & Shipping

FAQ

Q1: What applications is this prefabricated substation designed for?

A: It is suitable for ground-mounted utility PV stations, mountain photovoltaic projects, and industrial or commercial large-scale PV and energy storage scenarios requiring fast, reliable grid connection.

Q2: How much does factory pre-assembly reduce construction time?

A: Compared to traditional site-built substations, the factory pre-installation and pre-debugging approach shortens the on-site construction cycle by more than 80%. Only basic wiring is required on site.

Q3: What transformer capacities are available?

A: Step-up transformer capacity ranges from 500kVA to 6300kVA, with high-voltage side ratings between 7.2kV and 40.5kV to match different project scales and grid requirements.

Q4: Can the cabin be customized for specific site conditions?

A: Yes. Cabin size, primary electrical design, and functional module combinations can be tailored to your site terrain, space restrictions, and local power grid specifications.

Q5: Does the unit support remote monitoring and intelligent O&M?

A: Yes. It supports expansion of remote SCADA monitoring, power quality analysis, and fault location modules, all communicating via standard industrial protocols for centralized operation.

Q6: What safety protections are built into each cabinet?

A: Every cabinet includes a five-proof interlock system, lighting, ventilation, fire protection, temperature and humidity control, and emergency locking — providing layered protection for unmanned outdoor operation.

Contact Us

Have a project requirement or need a custom configuration for a PV Prefabricated Substation? Reach out to our technical team at [email protected] — we respond promptly.

Team