Prefabricated Substation Manufacturer

As a leading prefabricated substation manufacturer, Zhejiang Juhongkai designs and supplies high-performance modular transformer substations suitable for residential, commercial, and renewable energy distribution networks. Our products feature compact design, quick installation, and reliable protection systems.

Prefabricated Substation Selection Guide

Select the suitable prefabricated substation based on system voltage, transformer capacity, installation environment, grid standard, energy source and required monitoring functions.

Our Strengths as a Prefabricated Substation Manufacturer

1. Modular R&D & Standardization Capability 

   The first domestic enterprise to complete R&D, network access testing, and batch supply of *standardized & customized prefabricated substations*. Covering State Grid standards (YB-12), new energy (YB New Energy), and American/Chinese-style (ZGS11/YBW) designs, supporting plug-and-play on-site installation.  

2. CNAS-Accredited In-House Lab (Modular Performance Testing)

   Lab certified by CNAS – conducts targeted tests for prefabricated substations:  

   - Overall insulation performance test (adapt to outdoor/industrial environments)  

   - Module connection reliability test (ensure on-site assembly efficiency)  

   - Extreme temperature resistance (-30℃~+60℃, for new energy/wind power projects)  

   - Noise reduction test (for urban/suburban residential areas)  

3. Smart Prefabrication & Rapid Delivery

   Equipped with a "smart quality control brain" and modular production lines – pre-integrate transformers, switchgear, and control systems in the factory, reducing on-site construction time by 60%. Support batch delivery (e.g., 30-day lead time for YB-12 State Grid substations).  

4. Full-Lifecycle Technical Support

   As a professional manufacturer, we provide beyond "product supply": on-site installation guidance, module debugging, and 5-year maintenance plans, solving prefabricated substation "installation & operation" pain points.

Key Features of Our Prefabricated Substations

Juhonkia prefabricated substations integrate medium-voltage switchgear, transformers, low-voltage distribution and protection systems into factory-assembled outdoor power-distribution solutions.

Rated Voltage Range: 10kV to 40.5kV, depending on product family

Rated Capacity Range: 200kVA to 3400kVA, depending on application and transformer configuration

Typical Applications: Utility distribution, industrial facilities, commercial developments, solar power plants and wind farms

Protection Level: Model-specific enclosure protection, including IP33D and up to IP54 options

Customization: Voltage ratio, transformer type, HV/LV arrangement, enclosure material, monitoring system, communications interface and environmental protection can be configured by project requirement

Applications of Prefabricated Transformer Substations

• Urban residential and commercial complexes

• Industrial manufacturing zones

• Renewable energy (solar, wind) power generation sites

• Infrastructure and transport projects

Manufacturing Excellence & Quality Control

Juhongkai’s production facility is equipped with advanced sheet-metal forming, transformer assembly, and electrical testing equipment. All prefabricated substations undergo strict quality inspection including dielectric, temperature-rise, IP protection, and mechanical strength tests to meet IEC, ISO, and CE standards.

• OEM & ODM support for voltage, capacity, and enclosure material

• Compliance with IEC 62271 / GB 17467 standards

• Customization for local grid codes and environmental conditions

Why Choose Juhongkai as Your Prefabricated Substation Manufacturer

• Comprehensive Integration: Combines HV, transformer, LV systems in one unit.

• Flexible Design: Multiple layout configurations available for diverse site requirements.

• High Safety & Protection: Overcurrent, earth fault, and temperature protection systems.

• Fast Installation: Plug-and-play delivery reduces on-site labor cost.

• Strong R&D Team: Experience in renewable and smart grid applications.

Frequently Asked Questions

How long does it take to install a prefabricated substation?

The installation schedule depends on foundation readiness, transport access, crane positioning, cable trench preparation, earthing works, cable termination and commissioning requirements.

Because the transformer, switchgear and control systems are pre-integrated at the factory, on-site work is reduced compared with conventional site-built substations. Juhonkia states that modular prefabrication can reduce on-site construction time and gives approximately 30 days as an example production lead time for batch YB-12 orders. Final installation and energization timing should be confirmed against the project drawing and site conditions.

How do I choose the right prefabricated substation model?

Start with the following information:

• Grid voltage and required voltage ratio

• Transformer capacity and estimated load profile

• HV and LV incoming/outgoing feeder quantity

• Required short-circuit withstand level

• Transformer type: oil-immersed or dry-type

• Utility-standard or project-specific requirements

• Installation site, altitude, temperature, corrosion level and dust exposure

• Monitoring, SCADA, communication and protection-relay requirements

For standardized 10kV utility distribution, YB-12 is suitable. For smart and flexible distribution projects, YBZ is a stronger option. For solar and wind projects, YBW or ZGS11 should be evaluated according to voltage ratio, environmental conditions and transformer arrangement.

What IP rating is available?

The protection level depends on the product model and enclosure configuration.

• YB-12 State Grid Standardized Prefabricated Substation: IP33D minimum for the external enclosure and IP2XC minimum between internal compartments.

• YBW New Energy Compact Substation: protection can reach IP54.

• YBZ and ZGS11: protection level should be confirmed according to enclosure material, ventilation design, cable-entry method and project environment.

Do not state “IP54” as a general rating for all prefabricated substations.

Can the substation be used in harsh outdoor environments?

Yes. The enclosure, ventilation, insulation, anti-condensation, anti-corrosion treatment, temperature-control system and protection rating can be selected according to the installation environment.

For wind, solar, desert, coastal, high-altitude or heavy-pollution sites, please provide the site altitude, ambient temperature range, humidity, salt-spray condition and required corrosion-protection class before design confirmation.

What maintenance and technical support are available?

Juhonkia can provide technical support covering installation guidance, module debugging, commissioning assistance and maintenance planning.

The exact scope should be clarified in the quotation or technical agreement, including:

• Remote technical support

• Installation supervision

• Commissioning support

• Operation and maintenance manuals

• Spare-parts recommendation

• Fault diagnosis support

• On-site service availability

• Maintenance-plan duration and regional coverage

The current page mentions installation guidance, module debugging and five-year maintenance plans. This should be written as “maintenance plans are available” rather than implying that every order automatically includes five years of on-site service.

Can the prefabricated substation be customized?

Yes. Customization may include transformer capacity, voltage ratio, HV switchgear type, LV outgoing feeders, relay protection, metering, SCADA interface, enclosure material, cable-entry direction, ventilation, lighting, anti-corrosion treatment and intelligent monitoring functions.

Which standards and certifications can be supported?

The applicable standards, type-test documentation and certification scope depend on the selected model, voltage level, transformer configuration and destination market.

For project or tender requirements, provide the requested standard list before quotation. Do not use a blanket statement such as “all models are CE certified” or “all models comply with every IEC standard” unless the corresponding documentation is available for the exact model and configuration.