300kVA Single Phase Pad Mounted Transformer
300kVA Single Phase Pad Mounted Transformer is a compact and efficient solution tailored for underground residential distribution (URD) systems and loop-feed applications. This fully sealed, oil-immersed transformer features high-efficiency electrical steel cores and robust aluminum or copper windings to deliver minimal losses and superior voltage regulation from high-voltage inputs like 13.8kV or 34.5kV down to 120/240V or 277/480V secondary. The environmentally friendly PCB-free dielectric fluid ensures excellent cooling and insulation while meeting ANSI/IEEE standards for loop or radial feed configurations. Ideal for urban and suburban settings, this pad-mounted transformer provides quiet operation, high overload capacity.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2, 33 or others
- Secondary Voltage Ratings 480-240/240-120or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Loop Feed or Radial Feed
- BIL 30/95kV
- Standards IEEE, ANSI, CSA
- Application reliable power to multiple homes
- Power Rating 300kVA
- Certificate UL/cUL, CSA, CESI
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
300kVA Single Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 300 kVA |
| Rating Primary Voltage | 11950Delta or Customized |
| Secondary Voltage | 480-240V 240-120V 277V Customized |
| Frequency | 50/60Hz |
| Vector Group | Ii0,Ii6 |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE,Doe 2016,CAS Std or Customized |
| Impedance Voltage | Nominal 2% or Customized 1.1-5.75% |
| Altitude | ≤1,000m or Customized |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized etc |
| Tank material | Mild Steel, 304 Stainless Steel |
| Insulating Oil Weight | 620 kg |
| Total Weight | 3650 kg |
| Outline Dimensions（L×W×H）in. | 1500×1200×1800(mm) |
| Lifting Lug | ELSP Fuse |
| Hinged Door | BAY-O-NET Fuse |
| Parking Bracket | Tap Changer |
| Tank Cover | Oil Level Gauge |
| L.V Bushing (4-Hole ) | Pressure Relief Valve |
| Two/Four Position Load break Switch | Vacuum Pressure Gauge |
| HV Grounding Copper Bar | Terminal Block |
| Temperature Indicator | Door Handle |
| H.V Bushing Well | Ground Strap |
| Grounding Copper Bar | Nameplate |
| 1"'Drain Valve With 3/8" Sampler | Non-PCB decal |
| 1" Upper Fill Valve Filter Press Connection | High Voltage Warning Signs |
Customization Optional
300kVA Single Phase Pad Mounted Transformer
The 300kVA Single Phase Pad Mounted Transformer is highly customizable to meet specific utility requirements and site conditions in residential or light commercial distribution networks. Primary voltage options range from 2.4kV to 34.5kV, with secondary configurations including 120/240V, 240/120V, 277V, or 480Y/277V to suit diverse load needs. Winding materials can be specified as copper for maximum conductivity and longevity or aluminum for lighter weight and cost savings. High-voltage bushing arrangements support loop-feed (four primary positions) or radial-feed (two positions), with optional elbow connectors or load-break switches for enhanced operational flexibility. Low-voltage terminals offer multiple spade or clamp designs for easy cable connections, while bayonet or current-limiting fuses provide tailored overcurrent protection.
Additional custom features include corrosion-resistant stainless steel tanks in various ANSI colors, wildlife guards for environmental safety, and gauge packages with liquid level or temperature indicators. Eco-conscious alternatives like FR3 natural ester fluid improve fire safety and biodegradability. Surge arrester mounting provisions, parking stands, and nameplate engraving further personalize the unit. Impedance values (1.5-5%) and BIL ratings can be adjusted for network compatibility. These versatile options make the transformer searchable and ideal for "custom single-phase pad-mounted transformers" in utility planning and procurement.
Packing and Shipping
300kVA Single Phase Pad Mounted Transformer
300kVA Single Phase Pad Mounted Transformer undergoes rigorous packaging to ensure safe transit and immediate deployment in underground distribution projects. Each unit is securely mounted on a treated wooden skid with lifting eyes and forklift pockets for easy handling. Protective covers shield high- and low-voltage bushings, while the tank is wrapped in heavy-duty plastic sheeting to prevent scratches and moisture intrusion. Fragile accessories like gauges and switches receive foam padding and individual boxing. The entire package is crated in a reinforced, export-grade wooden enclosure compliant with international phytosanitary standards, featuring impact-resistant corners and desiccant bags to maintain internal dryness during long voyages.
Global shipping is optimized for efficiency and security, offering sea, air, or land options based on project timelines. Containerized ocean freight in 20ft or 40ft units provides cost-effective delivery for international orders, with professional securing to prevent shifting and typical transit times of 15-40 days. Air freight accelerates critical replacements to 3-7 days, while domestic trucking uses flatbed or enclosed trailers with tarping for weather protection. Comprehensive insurance covers full replacement value, addressing common concerns in "pad-mounted transformer transportation" searches.
Documentation packages include detailed packing lists, dimensional drawings, and material safety data for dielectric fluid to facilitate smooth customs clearance. Sustainable packaging uses recyclable materials where possible, and carbon-conscious routing minimizes environmental impact. Real-time tracking via GPS-enabled systems keeps clients updated from factory loading to final placement.
Delivery completion services offer optional site unloading assistance, initial visual inspections, and packaging removal to speed installation. For fleet orders, consolidated shipments reduce costs and coordination efforts. This end-to-end packing and shipping strategy guarantees your 300kVA pad-mounted transformer arrives intact and ready for service, enhancing reliability in utility distribution networks.
Global shipping is optimized for efficiency and security, offering sea, air, or land options based on project timelines. Containerized ocean freight in 20ft or 40ft units provides cost-effective delivery for international orders, with professional securing to prevent shifting and typical transit times of 15-40 days. Air freight accelerates critical replacements to 3-7 days, while domestic trucking uses flatbed or enclosed trailers with tarping for weather protection. Comprehensive insurance covers full replacement value, addressing common concerns in "pad-mounted transformer transportation" searches.
Documentation packages include detailed packing lists, dimensional drawings, and material safety data for dielectric fluid to facilitate smooth customs clearance. Sustainable packaging uses recyclable materials where possible, and carbon-conscious routing minimizes environmental impact. Real-time tracking via GPS-enabled systems keeps clients updated from factory loading to final placement.
Delivery completion services offer optional site unloading assistance, initial visual inspections, and packaging removal to speed installation. For fleet orders, consolidated shipments reduce costs and coordination efforts. This end-to-end packing and shipping strategy guarantees your 300kVA pad-mounted transformer arrives intact and ready for service, enhancing reliability in utility distribution networks.
32
32 years of industry experience
Manufacturer Test
300kVA Single Phase Pad Mounted Transformer
Progress Test
Production monitoring for the 300kVA single-phase pad-mounted transformer starts with core steel verification through watt-loss testing to ensure high-efficiency material selection. Winding continuity and insulation resistance checks confirm uniform coil construction and early dielectric integrity. Tank fabrication includes dimensional accuracy scans and weld penetration tests for structural soundness. Initial assembly stages feature bushing alignment verification and compartment door seal testing for tamper resistance. These early controls establish a solid foundation for safety and performance compliance. Electrical tests measure turns ratio accuracy and polarity on the active part. Accessory integration trials validate fuse holder functionality and switch operation. Thermal cycling simulations assess tank expansion and fluid stability.
Design Tests
All transformer will be test after finishing the production, test items as below:
♦ Insulation Power Factor:
♦ Ratio, Polarity, and Phase Relation:
♦ Winding Resistance:
♦ Impulse Tests:
♦ On load Loss Test:
♦ No Load Loss Test
♦ Leak Test:
♦ DC Insulation Resistance 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)
Transformer Factory Acceptance Test
Factory Acceptance Testing for the 300kVA pad-mounted transformer includes precise voltage ratio and polarity confirmation using calibrated instruments across high- and low-voltage sides. No-load excitation current and core loss measurements verify efficiency benchmarks. Insulation resistance and applied potential tests (up to 34.5kV class) confirm dielectric strength. Resistance checks on windings ensure thermal design accuracy, with results documented for client witnessing and ANSI compliance. Comprehensive FAT continues with induced potential testing and partial discharge evaluation to detect insulation anomalies. Short-circuit capability is assessed through impedance and load loss measurements. Functional operation of load-break switches, bayonet fuses, and parking stands is demonstrated. Final visual inspection covers compartment security, labeling, and paint finish. Oil dielectric breakdown and moisture content tests complete the protocol, certifying the transformer's suitability for safe residential distribution.
Routine Test - Induced Voltage
Purpose of Testing
The purpose of the Induced Voltage test is to simulate the electrical stress that the equipment may encounter under actual working conditions by applying an induced voltage, thereby evaluating the tolerance and stability of the equipment's insulation system. This test helps to detect the insulation performance of the equipment under high voltage conditions and ensure its safety and reliability in operation.
Testing Equipment
Induced Voltage Tester (e.g. OMICRON, Megger, HioKI, etc.)
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
Pre-Test Preparation
Disconnect all relevant power supplies and ensure that the equipment is properly grounded and discharged.
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Measure and Record
Start the test and record the following parameters:
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Temperature Correction
The measured induced voltage data is corrected to the reference temperature (usually 20°C) to ensure the accuracy of the test results.
Repeat Testing (if necessary)
If necessary, test different windings (HV, MV, LV) and bushings separately and compare the results at different test points.
Evaluation Criteria (Reference)
Inductive voltage ≤ 1% (Excellent): normally and meets safety standards.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Suited for light commercial sites like strip malls or small offices, providing discreet, ground-level voltage transformation with enhanced safety features.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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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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