Outdoor Prefabricated Transformer Substation
The Outdoor Prefabricated Transformer Substation is an integrated medium-voltage power distribution solution designed for outdoor installation in industrial, commercial, utility, and renewable energy applications. The system combines medium-voltage switchgear, distribution transformer, low-voltage distribution equipment, and intelligent control systems into a compact prefabricated enclosure, providing efficient and reliable power transformation while minimizing construction time and installation costs. Engineered for harsh environmental conditions, the outdoor substation features a weather-resistant enclosure, corrosion-protected structure, advanced insulation technology, and optimized thermal ventilation system to ensure long-term operational stability. Its modular design allows rapid deployment, simplified transportation, and flexible installation while improving maintenance accessibility and operational safety. The Outdoor Prefabricated Transformer Substation supports multiple voltage levels, transformer capacities, and intelligent automation functions, making it suitable for utility distribution systems, renewable energy projects, urban infrastructure, mining facilities, transportation networks, and industrial manufacturing plants. With smart-grid compatibility and customizable configurations, the substation provides efficient and scalable electrical distribution performance for modern power networks.
- Primary Voltage Ratings 6kV / 10kV / 11kV / 22kV / 33kV
- Type Prefabricated Substation
- BIL 200kVA – 5000kVA
- Standards IEC, ASTM, UL
- Application data centers, hospitals, railway stations, ports
- Certificate UL, CESI, IEEE
- Cooling Method ONAN / ONAF
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
Outdoor Prefabricated Transformer Substation
Outdoor Prefabricated Transformer Substation Data Sheet
| Parameter | Specification |
| Product Type | Outdoor Prefabricated Transformer Substation |
| Rated Voltage | 6kV / 10kV / 11kV / 22kV / 33kV |
| Transformer Capacity Range | 200kVA – 5000kVA |
| Low Voltage Output | 400V / 415V / 433V |
| Frequency | 50Hz / 60Hz |
| Transformer Type | Oil-Immersed / Dry-Type |
| Cooling Method | ONAN / ONAF |
| HV Switchgear Configuration | RMU / VCB / GIS |
| Rated Current | Up to 4000A |
| Rated Short Circuit Current | 16kA – 40kA |
| Insulation Level | 75kV – 170kV BIL |
| Protection Degree | IP44 / IP54 / IP65 |
| Enclosure Material | Galvanized Steel / Stainless Steel / Composite Material |
| Surface Treatment | Outdoor Anti-Corrosion Powder Coating |
| Busbar Material | Copper / Aluminum |
| Ventilation System | Natural / Forced Ventilation |
| Ambient Operating Temperature | -40°C to +55°C |
| Maximum Installation Altitude | ≤ 4000m |
| Humidity Resistance | ≤ 95% RH |
| Communication Protocol | Modbus / IEC 61850 |
| Smart Monitoring System | Optional SCADA Integration |
| Cable Entry Method | Bottom / Side Entry |
| Grounding System | TN-S / TT / IT |
| Noise Level | ≤ 65dB |
| Service Life | More than 30 Years |
| Applicable Standards | IEC 62271 / IEC 60076 / ANSI / IEEE |
Customization Optional
Outdoor Prefabricated Transformer Substation
The Outdoor Prefabricated Transformer Substation can be fully customized according to project voltage requirements, environmental operating conditions, and regional utility specifications. Customers may select oil-immersed transformers, dry-type transformers, or environmentally friendly ester-filled transformers depending on efficiency targets, fire safety requirements, and installation locations. Medium-voltage sections can be configured with ring main units, vacuum circuit breakers, gas-insulated switchgear, or load break switch assemblies to support different grid protection schemes and operational structures. The low-voltage compartment can additionally integrate intelligent energy metering systems, automatic transfer switches, harmonic filtering equipment, reactive power compensation devices, and advanced digital protection relays for smart electrical management applications.
The enclosure and structural configuration can also be optimized for coastal environments, desert regions, tropical climates, mining operations, and heavy industrial pollution areas. Optional features include anti-condensation heaters, intelligent ventilation systems, arc fault protection devices, fire suppression systems, thermal insulation structures, remote monitoring modules, and internal maintenance lighting systems. Customers may further customize enclosure dimensions, ventilation openings, cable routing methods, paint color, branding labels, maintenance access layouts, and renewable energy integration interfaces to improve operational efficiency and installation flexibility. These customization capabilities ensure the outdoor transformer substation can satisfy complex utility, industrial, infrastructure, and renewable energy distribution applications.
Packing and Shipping
Outdoor Prefabricated Transformer Substation
The Outdoor Prefabricated Transformer Substation is packaged using industrial heavy-duty export protection methods to ensure safe transportation, secure storage, and reliable international delivery under demanding logistics conditions. Prior to packaging, the complete substation undergoes mechanical inspection, coating verification, enclosure sealing checks, and anti-corrosion treatment to minimize the risk of transportation damage and environmental exposure. Sensitive electrical devices including protection relays, communication systems, intelligent monitoring modules, and meters are additionally protected using moisture-proof and vibration-resistant packaging materials.
The transformer compartment, medium-voltage switchgear section, and low-voltage distribution chamber are internally reinforced using transportation locking systems and heavy-duty support structures to prevent vibration damage and component movement during road, railway, or sea transportation. External surfaces are protected using industrial waterproof wrapping film, anti-scratch covers, reinforced corner guards, and impact-resistant fastening systems to preserve enclosure integrity throughout long-distance shipment operations. Integrated lifting lugs and forklift access channels simplify loading and unloading procedures at logistics terminals and project sites.
Depending on project dimensions, transportation conditions, and customer requirements, the outdoor substation may be shipped using skid-mounted structures, steel-frame export packaging, fumigation-free wooden crates, or direct container fastening systems compliant with international logistics standards. Additional anti-condensation packaging solutions, anti-vibration reinforcement measures, and marine-grade salt spray protection systems are available for coastal projects, mining environments, tropical regions, or remote installation sites requiring extended transportation durations.
Shipping documentation generally includes factory inspection certificates, operation manuals, packing lists, electrical schematics, wiring diagrams, quality reports, and export compliance certifications. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination services. The complete packing and shipping process is designed to maintain equipment quality, reduce transportation risks, and ensure safe delivery to the final installation destination.
The transformer compartment, medium-voltage switchgear section, and low-voltage distribution chamber are internally reinforced using transportation locking systems and heavy-duty support structures to prevent vibration damage and component movement during road, railway, or sea transportation. External surfaces are protected using industrial waterproof wrapping film, anti-scratch covers, reinforced corner guards, and impact-resistant fastening systems to preserve enclosure integrity throughout long-distance shipment operations. Integrated lifting lugs and forklift access channels simplify loading and unloading procedures at logistics terminals and project sites.
Depending on project dimensions, transportation conditions, and customer requirements, the outdoor substation may be shipped using skid-mounted structures, steel-frame export packaging, fumigation-free wooden crates, or direct container fastening systems compliant with international logistics standards. Additional anti-condensation packaging solutions, anti-vibration reinforcement measures, and marine-grade salt spray protection systems are available for coastal projects, mining environments, tropical regions, or remote installation sites requiring extended transportation durations.
Shipping documentation generally includes factory inspection certificates, operation manuals, packing lists, electrical schematics, wiring diagrams, quality reports, and export compliance certifications. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination services. The complete packing and shipping process is designed to maintain equipment quality, reduce transportation risks, and ensure safe delivery to the final installation destination.
32
32 years of industry experience
Manufacturer Test
Outdoor Prefabricated Transformer Substation
Progress Test
The production progress testing procedure for the Outdoor Prefabricated Transformer Substation is implemented throughout all manufacturing stages to ensure structural integrity, electrical reliability, and assembly precision. Initial inspections focus on raw material verification including enclosure steel thickness measurement, insulation material testing, copper busbar conductivity analysis, and anti-corrosion coating inspection to confirm compliance with engineering specifications and international manufacturing standards. Electrical progress testing includes insulation resistance measurement, contact resistance testing, breaker mechanical operation verification, relay configuration inspection, and low-voltage functional simulation. Transformer winding resistance testing, tap changer operational checks, and control circuit verification are additionally performed to confirm stable operating performance under rated load conditions. Communication interfaces and intelligent monitoring systems are tested to verify accurate signal transmission and smart-grid compatibility.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Factory Acceptance Test
The transformer Factory Acceptance Test program for the Outdoor Prefabricated Transformer Substation is designed to guarantee manufacturing quality consistency and dependable field operation in utility and industrial power distribution systems. The testing procedure begins with visual inspections and dimensional verification of the transformer tank, bushings, cooling radiators, grounding terminals, enclosure coating quality, and accessory installation to confirm conformity with approved engineering drawings. Upon successful completion of all inspections and electrical tests, certified FAT reports, calibration certificates, operation manuals, transformer nameplate data, and inspection photographs are prepared for customer approval. This Factory Acceptance Test process ensures the outdoor transformer substation fully satisfies project performance requirements and international operational standards before shipment and field installation.
Routine Test - Impulse Tests
Purpose of Testing
The purpose of Impulse Tests is to verify the insulation strength of electrical equipment when it is subjected to lightning strikes or switching overvoltages. By applying high-energy impulse voltages, it is possible to detect potential defects in the insulation system.
Testing Equipment
Impulse voltage generator (e.g. Haefely, Hipotronics, Tettex, etc.)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Pre-Test Preparation
Please test under suitable environmental conditions: relative humidity less than 65%, no rain or condensation (recommended temperature: 15-30°C).
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Test Progress
Connect the Test Instrument:
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Measure and Record
Collect and record the impact waveform, including:
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Waveform Correction
Check whether the impulse voltage waveform meets the specification requirements (wave head time 1.2μs ±30%, half-peak time 50μs ±20%).
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
Repeat Testing (if necessary)
Impact tests are performed for different phases and windings (HV/MV/LV).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
Evaluation Criteria (Reference)
No internal insulation breakdown or flashover (detected by observing waveform continuity and audibly).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Suitable for renewable energy plants, industrial manufacturing facilities, mining operations, urban utility distribution systems, transportation infrastructure, commercial complexes, and municipal electrical modernization projects.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
Transformers Packaging (2)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
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What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
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What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different devices.
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Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
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