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The prefabricated compact substation is an all-in-one factory assembled power distribution unit designed for outdoor applications. It integrates a medium voltage switchgear, an oil immersed or dry type transformer, and a low voltage distribution panel into a single weatherproof enclosure. The compact design eliminates the need for individual equipment rooms and reduces on-site civil works, allowing rapid deployment in areas where space is limited or construction time is critical.
Everything is pre-wired and factory tested before shipment. Upon arrival, only cable connections between the substation and the utility grid or load are required. This turnkey solution significantly reduces installation time and labor cost compared to traditional substations built on site.
The integrated design combines transformer, switchgear, and distribution panel in one enclosure, occupying up to 60 percent less space than traditional substations with separate equipment rooms.
Every unit undergoes full assembly and routine testing at our facility, ensuring all components work properly before delivery and eliminating on-site troubleshooting.
Only foundation preparation and cable connection are needed upon arrival, cutting installation time from weeks to days compared to stick-built substations.
Sourcing all major components from a single manufacturer simplifies procurement, ensures component compatibility, and provides single-point warranty responsibility.
The skid mounted or pad mounted design allows the substation to be lifted and moved to a new location when project requirements change, making it suitable for both permanent and temporary applications.
Item | Unit | Technical parameter |
Rated voltage | KV | 12/0.4 |
Max. operating voltage | KV | 12 |
Rated frequency | Hz | 50 |
Rated capacity | KVA | 50-2500 |
1 min power frequency withstand voltage | KV | 35 |
Lightning impulse voltage | KV | 75 |
Cooling code | oil immersed self cooling | |
High voltage backup fuse breking current | KA | 50 |
Plug-in fuse breaking current | KA | 2.5 |
Ambient temparature | °C | -35~+40 |
Allowable temparature rise of coil | °C | 65 |
No-load voltage regulation | ±5% or ±2*2.5% | |
Noise level | db | 50 |
Protection level | IP43 |
Selecting a suitable 35kV prefabricated compact substation requires careful consideration of the project's power demand, medium-voltage distribution system, transformer capacity, and installation conditions. Since this equipment integrates multiple electrical components into a coordinated solution, buyers should evaluate the complete system rather than selecting individual components separately.
This guide outlines the key factors to consider before ordering a 35kV prefabricated compact substation for your project.
Start by confirming the nominal voltage of the medium-voltage network and the required equipment voltage rating. A 35kV-class substation must be suitable for the project's maximum system voltage and insulation requirements.
Next, determine the required transformer capacity according to the connected load, expected demand, load growth, and project design. The transformer rating should be coordinated with the upstream power supply, downstream distribution system, and required operating conditions.
The high-voltage section connects the substation to the incoming power supply and provides the required switching, isolation, and protection functions.
Depending on the project design, the high-voltage section may include disconnectors, circuit breakers, protection devices, metering equipment, and other necessary components.
Before ordering, confirm the incoming connection arrangement, required switching functions, short-circuit ratings, protection scheme, and applicable utility requirements. The final configuration should follow the project single-line diagram (SLD).
The transformer is one of the most important components of a prefabricated compact substation. Its specifications should match the project's load requirements and distribution design.
Key information includes:
Rated transformer capacity in kVA or MVA.
Primary and secondary voltage ratings.
Transformer type, such as oil-immersed or dry-type, where available.
Vector group and winding configuration.
Impedance voltage and required efficiency level.
Tap-changing requirements and applicable standards.
The transformer specifications should be coordinated with the high-voltage protection scheme and the low-voltage distribution requirements.
The low-voltage section distributes power from the transformer to downstream loads or distribution feeders.
Before selecting the configuration, identify the required low-voltage rated voltage, main incoming current, outgoing feeder quantity, protective devices, metering functions, and control requirements.
For projects with multiple outgoing circuits, provide the load schedule or low-voltage single-line diagram. This helps determine the required panel arrangement and rated current of the main busbar and outgoing circuits.
A prefabricated compact substation must be designed for its intended installation loc
Q1. Are you a trading company or manufacturer?
A: We are a professional factory with 10 years of experience in the field of High and Low voltage switchgears, substations, transformers, cable distribution boxes, and various electrical equipment, such as vacuum circuit breakers, load break switches, etc.
Our factory is an excellent supplier of the State Grid Corporation of China.
Q2. Do you accept customized service?
A: We offer OEM/ODM service, and can print your logo on the product. Our professional, technical, and quotation team can provide a satisfactory project according to your drawing and parameters.
Q3. What is your MOQ?
A: Our MOQ is 1 piece.
Q4. How long is your delivery lead time?
A: It depends on your product requirement and quantity. Generally, 5~10 working days are available
Q5. How do you solve quality problems?
A: Please provide detailed photos of quality problems. Our technical and quality testing department will analyse. We will make a satisfactory solution within 2 days.
Q6. What are your payment terms?
A: 30%T/T in advance,70% before shipment. West Union, L/C are also acceptable.
