Prefabricated Substation – Integrated, Efficient Modular Power Solution for Global Power Distribution Systems

The prefabricated substation (also known as compact substation or box-type substation) is a modular, integrated power distribution device, manufactured in strict accordance with IEC 60076, GB 1094 and GB 50059 international and national standards. It integrates high-voltage switchgear, power transformer, low-voltage distribution cabinet, reactive power compensation device and intelligent control system into a single steel enclosure, realizing the integration of voltage transformation, power distribution, control and protection. Widely applied in urban and rural power grid upgrading, residential communities, industrial parks, commercial centers, transportation hubs, renewable energy bases and temporary construction sites worldwide, it is favored by power companies, engineering contractors and industrial enterprises in Africa, Southeast Asia, Central Asia and Latin America for its compact structure, fast installation, reliable performance and low operating cost.

1. Core Technical Parameters & Customization Options

Our prefabricated substation covers a full range of voltage and capacity configurations, with flexible customization services to meet the diverse power supply needs of different regions, scenarios and load types, ensuring perfect matching with the user’s power system and on-site installation conditions.

Full-Range Technical Specifications

Voltage level: High-voltage side 6kV, 10kV, 35kV (optional 24kV for special scenarios), low-voltage side 0.4kV, fully compatible with the power grid standards of most countries and regions. Rated capacity: Ranges from 30 kVA to 31,500 kVA, covering small-scale terminal power distribution, medium-sized industrial load supply and large-scale regional power supply scenarios.

Rated frequency: 50Hz/60Hz, adapting to the power grid frequency requirements of different regions, with strong cross-border compatibility. Core components configuration: High-voltage switchgear (SF6 load switch, vacuum circuit breaker optional), power transformer (oil-immersed or dry-type optional), low-voltage distribution cabinet (with circuit breakers, contactors, meters), reactive power compensation device (automatic or manual compensation optional) and intelligent control system.

Cooling method: Natural cooling (AN/ONAN) as standard, suitable for medium and small capacity and light load scenarios; forced cooling (AF/OFAF) optional for large capacity and high-load continuous operation scenarios, ensuring efficient heat dissipation and stable operation. Protection level: IP33/IP54 for the enclosure, effectively preventing dust and rainwater intrusion, suitable for outdoor installation in various complex environments.

Insulation grade: Mainly F grade (155℃), with optional H grade (180℃) for high-temperature working environments such as mines and steel plants. The overall efficiency of the substation reaches over 98%, and the no-load loss and load loss of the internal transformer are optimized according to the latest energy efficiency standards, meeting the global green energy-saving and environmental protection requirements. The seismic grade reaches 8 degrees, adapting to areas with frequent earthquakes.

Comprehensive Customization Services

To adapt to the diverse needs of global users, we provide one-stop customization services. According to the local power grid standards and on-site installation conditions, we can customize the voltage level, capacity, core component configuration and enclosure material of the substation. For high-temperature, high-humidity, coastal salt-spray or high-altitude areas, we offer enhanced anti-corrosion, dust-proof and insulation treatment for the enclosure and internal components.

For scenarios requiring intelligent operation and maintenance, we can configure an intelligent monitoring system (including remote control, remote measurement, remote signaling and remote adjustment functions), which can monitor the operating status of the substation in real time through a mobile phone or computer, and issue an alarm in time for abnormal conditions. For noise-sensitive scenarios such as residential areas and hospitals, we can customize low-noise substations with noise levels controlled within ≤50dB (measured at 1m distance).

Additionally, we provide two main enclosure types for selection: European-style (YB series) and American-style (ZB series). The European-style enclosure adopts a modular design with separate compartments for high-voltage, transformer and low-voltage units, featuring good heat dissipation and easy maintenance; the American-style enclosure has a more compact structure, smaller volume and lower cost, suitable for scenarios with limited installation space. We can also customize the enclosure color, dimensions and installation method (floor-mounted, pad-mounted) to fit the user’s on-site installation space and aesthetic requirements.

2. Advanced Structure & Core Competitive Advantages

The prefabricated substation adopts a scientific structural design and high-quality raw materials, integrating integration, efficiency, safety and environmental protection, with outstanding performance in all aspects, making it stand out among traditional civil substations and similar modular products.

Integrated Modular Design & Fast Installation

The substation integrates all core components into a single steel enclosure, with a compact structure and reasonable layout, and each functional unit is physically isolated to ensure electrical safety and heat dissipation efficiency. Compared with traditional civil substations, it occupies only 1/5 to 1/10 of the land area, significantly saving land resources, especially suitable for crowded urban areas and scenarios with limited land.

All components are pre-assembled, wired and tested in the factory, and the on-site installation only requires hoisting, fixing and connecting the incoming and outgoing lines, which can be completed within 1–3 days (70% shorter than traditional substations). This fast installation speed effectively shortens the project cycle, reduces construction costs and enables the substation to be put into use quickly, meeting the urgent power supply needs of temporary construction sites and emergency power supply scenarios.

High Reliability & Comprehensive Safety Protection

The enclosure is made of high-quality galvanized steel sheet or stainless steel, with multi-layer anti-corrosion coating on the surface, which can effectively resist the erosion of rain, dust, salt spray and corrosive gases, and has a service life of more than 20 years. The internal transformer (oil-immersed or dry-type optional) has excellent insulation performance and overload capacity, and the high-voltage switchgear is equipped with overvoltage, overcurrent, short-circuit and leakage protection devices, which can effectively protect the substation and connected equipment from damage.

The substation is equipped with a complete set of safety protection devices, including temperature and humidity controllers, ventilation fans, lightning protection devices and fire extinguishing devices (optional). The intelligent monitoring system can monitor the voltage, current, temperature, humidity and other operating parameters of the substation in real time, and issue an audible and visual alarm in time for abnormal conditions (such as overheating, overvoltage, short circuit), and can realize automatic power cut-off, effectively ensuring the safe and stable operation of the substation.

High-Efficiency Energy-Saving & Low Operating Cost

The internal transformer adopts a low-loss design (S11, S20 series oil-immersed transformer or SCB series dry-type transformer), with ultra-low no-load loss and load loss, which can reduce energy consumption by 25%–35% compared with ordinary transformers. The reactive power compensation device can automatically adjust the compensation capacity according to the load change, improve the power factor (up to ≥0.95), reduce line loss and further save energy.

The integrated structure and factory pre-assembly reduce the failure rate of the substation, and the intelligent monitoring system realizes remote operation and maintenance, reducing the frequency of on-site maintenance and labor costs. The low-loss design and low maintenance cost effectively reduce the user’s long-term operating costs, with a fast return on investment.

Strong Environmental Adaptability

The prefabricated substation has strong environmental adaptability, and can operate reliably in the temperature range of -40℃ to +60℃, adapting to harsh climate conditions such as high altitude (≤4000m), high temperature, high humidity and cold regions. The enclosure has good sealing performance, which can effectively prevent the intrusion of dust, rainwater and small animals, ensuring the normal operation of internal components in dusty and humid environments.

For special scenarios such as mines, chemical plants and coastal areas, we can provide enhanced protection level (IP54) and anti-corrosion treatment, and configure explosion-proof components for flammable and explosive scenarios, further improving the environmental adaptability and safety performance of the substation.

3. Main Application Scenarios

The prefabricated substation, with its integrated structure, fast installation and flexible configuration, is widely applicable to various power transmission and distribution scenarios, and is the core equipment for ensuring stable and efficient power supply worldwide.

• Urban & Rural Power Grid Upgrading: As a key equipment for rural power grid upgrading and urban power distribution network optimization, it replaces the old civil substations, improving the power supply quality and energy efficiency of the power grid. It is suitable for urban ring network power supply nodes, suburban power grid expansion and rural power supply stations, and is in line with the energy-saving transformation requirements of global power grids.

• Residential & Commercial Areas: Used in residential communities, commercial streets, shopping malls, hotels and office buildings, providing stable and safe power supply for residents and commercial users. The compact structure saves land resources, and the low-noise design avoids affecting the daily life of residents and the operation of commercial places.

• Industrial Parks & Small/Medium-Sized Enterprises: As the core power supply equipment for small and medium-sized industrial parks, factories, processing plants and workshops, it converts high-voltage electricity into low-voltage electricity to meet the power demand of production equipment and lighting. It can withstand the impact of industrial load fluctuations, ensure continuous production, and reduce the energy consumption cost of enterprises.

• Transportation Infrastructure: Used in subway systems, airports, high-speed rail stations, ports and highways, providing reliable power support for rail transit, lighting, toll stations and auxiliary facilities. The fast installation speed and compact structure are suitable for installation in transportation hubs with limited space, and the strong overload capacity adapts to the peak power demand of transportation hubs.

• Renewable Energy Bases: Used in wind farms, solar power plants and other renewable energy projects, it collects the electric energy generated by wind turbines or photovoltaic modules, converts the voltage to the required level, and transmits it to the local power grid. The low-loss design is in line with the green development concept of renewable energy, and can further improve the energy utilization efficiency of the project.

• Temporary Construction Sites & Emergency Power Supply: Applied to construction sites, temporary markets, disaster relief sites and other temporary or emergency power supply scenarios, the fast installation speed and easy mobility (optional mobile chassis) enable it to be quickly deployed and put into use, meeting the urgent power supply needs of temporary scenarios.