1600kVA Three Phase Pad Mounted Transformer
The 1600kVA Three Phase Pad Mounted Transformer is a robust, liquid-immersed, self-cooled distribution transformer designed for reliable underground power delivery in high-demand environments. Built to exceed IEEE C57.12.34, ANSI C57.12.00, DOE 2016 efficiency standards, and CSA C802.3 requirements, this UL-listed compartmental-type unit features dead-front high-voltage bushings (200A loadbreak inserts), loop-feed or radial configurations, and a fully sealed tank with mineral oil or eco-friendly FR3 fluid options.Suitable for primary voltages like 12.47kV, 13.8kV, 24.94kV, or 34.5kV to secondary 480Y/277V or 208Y/120V, it provides overload capability, low maintenance, and enhanced fire safety for modern grid integration.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2 or others
- Secondary Voltage Ratings 208GrdY/120;416GrdY/240 or Customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Loop Feed or Radial Feed
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, ASTM
- Application anufacturing warehouses, oil/gas processing sites, and data center
- Power Rating 1600kVA
- Certificate UL
- 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
1600kVA Three Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 1600kVA |
| Rating Primary Voltage | 4.16-34.5kV or customized |
| Secondary Voltage | 480GrdY/277 208GrdY/120 400GrdY/230 Customized（208Y/120 V to 4,160 V） |
| Frequency | 50/60Hz |
| Vector Group | Dyn1/Yyn0/Dyn11/Dyn5 |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE,Doe 2016,CAS Std or Customized |
| Impedance Voltage | Nominal 3.5% 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 | 3500 kg |
| Total Weight | 9700 kg |
| Outline Dimensions（L×W×H）in. | 2880×2200×2100（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(15kV) | Ground Strap |
| Grounding Copper Bar | Nameplate |
| 1"'Drain Valve With 3/8" Sampler | IR Window |
| 1" Upper Fill Valve Filter Press Connection | Terminal Box |
| Non-PCB decal | High Voltage Warning Signs |
Customization Optional
1600kVA Three Phase Pad Mounted Transformer
The 1600kVA three-phase pad mounted transformer offers broad customization to align with unique grid specifications, environmental conditions, and project demands, delivering optimized performance without compromising standards. Primary voltage options span 2.4kV to 34.5kV (e.g., 12.47GrdY/7.2kV, 13.8kV Delta, 24.94GrdY/14.4kV, 34.5GrdY/19.92kV), with secondary voltages including 208Y/120V, 480Y/277V, 600Y/347V, or specialized low-voltage outputs. Configurations support radial or loop feed, dead-front (200A/600A bushings) or live-front setups, and winding choices between aluminum for economical thermal performance or copper for maximum conductivity and reduced hotspots.
Advanced options include FR3 biodegradable fluid for superior fire point (>300°C) and environmental compliance (FM Approved, less-flammable per NEC), K-factor ratings (K-13 to K-20) for nonlinear loads like variable frequency drives or EV chargers, vacuum fault interrupters (VFI) for integrated protection, or differential relays.
Enclosure upgrades feature 100% stainless steel construction for corrosive coastal or industrial sites, seismic-rated bracing (IBC/OSHPD compliance), enhanced corrosion-resistant coatings, or nitrogen blanket systems to extend oil life. Accessories such as external gauges in lockable boxes, surge arresters, metering CTs/PTs, fan packages for forced cooling (KNAN upgrade), or remote monitoring provisions can be added. All modifications maintain full compliance with IEEE, ANSI, DOE, and CSA standards, with verified impedance (typically 5.75–6.5%), BIL levels (95–150kV), and efficiency through custom core/coil designs. This flexibility enables seamless adaptation for utility substations, renewable tie-ins, or high-reliability installations, balancing footprint, safety, longevity, and operational efficiency.
Packing and Shipping
1600kVA Three Phase Pad Mounted Transformer
The 1600kVA three-phase pad mounted transformer is meticulously packaged for secure global transport, protecting its integrity from factory to site. The fully assembled unit—including tank, compartmental cabinet, bushings, and integrated accessories—is mounted on a heavy-duty treated wooden skid or pallet base, facilitating forklift, crane, or roller handling. External surfaces are shielded with weatherproof plastic wrapping to guard against dust, humidity, and abrasions, while bushings, gauges, valves, and tap changer handles receive padded covers and temporary bracing to avoid transit stress.
For export or long-distance shipment, the transformer is enclosed in custom-engineered wooden crates or open-top cases made from ISPM-15 compliant, heat-treated lumber to satisfy international phytosanitary rules. Internal supports, foam inserts, and vibration-dampening materials secure the core/coil assembly against shocks, tilting, or road/sea movements. Oil-filled units ship under vacuum or positive nitrogen pressure to preserve insulation dryness and prevent oxidation; supplementary oil (if needed) travels in sealed drums within separate protective crates featuring spill containment.
Domestic shipments in North America typically use specialized lowboy or flatbed trailers with multi-point tie-downs, chains, and blocking per DOT regulations, often accompanied by pilot vehicles for oversize loads (approximate weight 5000–6500kg, dimensions ~2.5m L × 2.3m W × 2.2m H). International ocean freight employs 40ft flat-rack or open-top containers on RoRo vessels, with IMO-compliant lashing, chocking, and weatherdeck securing to withstand dynamic forces. Air-ride or specialized suspension transport minimizes inland road vibrations. Comprehensive cargo insurance, GPS tracking, and full documentation—including packing lists, bills of lading, certified test reports, and customs forms—accompany each shipment.
Site delivery includes on-arrival inspection for any transit-related issues, with immediate reporting for warranty resolution. These rigorous packing and shipping protocols safeguard against mechanical damage, contamination, or environmental exposure, ensuring the transformer maintains factory-fresh condition and achieves optimal performance upon energization in utility, commercial, or industrial settings.
For export or long-distance shipment, the transformer is enclosed in custom-engineered wooden crates or open-top cases made from ISPM-15 compliant, heat-treated lumber to satisfy international phytosanitary rules. Internal supports, foam inserts, and vibration-dampening materials secure the core/coil assembly against shocks, tilting, or road/sea movements. Oil-filled units ship under vacuum or positive nitrogen pressure to preserve insulation dryness and prevent oxidation; supplementary oil (if needed) travels in sealed drums within separate protective crates featuring spill containment.
Domestic shipments in North America typically use specialized lowboy or flatbed trailers with multi-point tie-downs, chains, and blocking per DOT regulations, often accompanied by pilot vehicles for oversize loads (approximate weight 5000–6500kg, dimensions ~2.5m L × 2.3m W × 2.2m H). International ocean freight employs 40ft flat-rack or open-top containers on RoRo vessels, with IMO-compliant lashing, chocking, and weatherdeck securing to withstand dynamic forces. Air-ride or specialized suspension transport minimizes inland road vibrations. Comprehensive cargo insurance, GPS tracking, and full documentation—including packing lists, bills of lading, certified test reports, and customs forms—accompany each shipment.
Site delivery includes on-arrival inspection for any transit-related issues, with immediate reporting for warranty resolution. These rigorous packing and shipping protocols safeguard against mechanical damage, contamination, or environmental exposure, ensuring the transformer maintains factory-fresh condition and achieves optimal performance upon energization in utility, commercial, or industrial settings.
32
32 years of industry experience
Manufacturer Test
1600kVA Three Phase Pad Mounted Transformer
Progress test
The first progress test series (early-stage routine checks per IEEE C57.12.90) for the 1600kVA pad mounted transformer confirms foundational electrical and mechanical quality during core/coil assembly before oil filling and final enclosure integration. Winding resistance is measured via the DC method across all phases and taps at ambient temperature, corrected to 75°C, ensuring ≤2% variation for uniform conductivity and no faulty joints. Turns ratio and polarity/phase relation are verified with precision TTR equipment on every tap position, maintaining ≤±0.5% deviation from nameplate and correct vector group alignment. Insulation resistance testing at 5000V DC yields >2000 MΩ between windings and to ground, validating vacuum drying effectiveness and insulation dryness. No-load loss and excitation current are recorded at rated voltage/frequency, confirming core efficiency, low magnetizing current, and DOE compliance.
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
♦ Leak Test
♦ DC Insulation Resistance Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
Factory Acceptance Test (FAT) routines for the 1600kVA three-phase pad-mounted transformer (per IEEE C57.12.90, C57.12.00, C57.12.34) verify core electrical and insulation parameters on every unit. Winding resistance measurement uses DC bridge/micro-ohmmeter, temperature-corrected to 75°C, with phase deviation ≤2% to detect poor connections or conductor issues. Turns ratio test across all taps ensures ≤±0.5% accuracy from nameplate, alongside polarity and phase sequence confirmation for proper vector group. Insulation resistance at 5000V DC exceeds 2000 MΩ, proving dielectric dryness and quality post-vacuum processing. No-load loss/excitation current test at rated conditions validates core performance and DOE efficiency compliance. Induced voltage test stresses inter-turn insulation at enhanced frequency, ensuring no discharge or failure.
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
Perfect for heavy industrial facilities such as manufacturing warehouses, oil/gas processing sites, and data center campuses, combined with wind energy integration, utility substations supporting EV infrastructure, or institutional complexes (universities/hospitals) with high HVAC/renewable loads. It delivers robust, tamper-proof distribution for demanding, high-reliability scenarios requiring efficiency and overload resilience.
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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