630kVA Single Phase Pad Mounted Transformer
Elevate your underground power distribution with the robust 630kVA Single Phase Pad Mounted Transformer, specifically designed for high-demand residential and commercial loop-feed networks. This oil-immersed, single-phase unit incorporates premium electrical steel laminations and heavy-duty windings to minimize energy losses and provide outstanding thermal performance under continuous loads. Meeting ANSI C57.12.38 and IEEE C57.12.90 standards, this 630kVA padmount transformer delivers precise voltage transformation from primary levels up to 34.5kV to common secondary voltages like 120/240V or 277/480V, supporting extended overloads and long-term reliability in densely populated areas.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2 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 sized commercial plazas, hotels, and educational campuses
- Power Rating 630kVA
- 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
630kVA Single Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 630kVA |
| 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
630kVA Single Phase Pad Mounted Transformer
The 630kVA Single Phase Pad Mounted Transformer delivers superior adaptability to meet exact utility and project requirements in demanding underground applications. Primary voltage selections span 7.2kV to 34.5kV with tailored BIL ratings (95kV to 200kV), while secondary options include 120/240V, 240/480V, 347/600V, or custom dual-voltage setups for diverse service demands. Winding configurations allow copper for premium conductivity and durability or aluminum for reduced weight and economical deployment. High-voltage switching supports advanced six-position load-break elbows or integral fused switches, complemented by distribution-class arresters and partial-range current-limiting fuses for comprehensive protection. Low-voltage terminals provide flexible blade or spade counts to match cable requirements, with optional metering or monitoring compartments.
Enhanced features include stainless steel or galvanized tank construction for aggressive environments, high-fire-point biodegradable fluids like natural esters, and specialized coatings in utility-specific colors. Accessories range from liquid level gauges, rapid pressure rise relays, and nitrogen blanket systems to wildlife deterrents and seismic bracing. Impedance customization (2-6%) optimizes system coordination, while nameplate data and barcode integration streamline asset management. These extensive choices ensure the transformer excels in searches for "custom high-capacity single-phase pad-mounted transformers."
Packing and Shipping
630kVA Single Phase Pad Mounted Transformer
Protecting the 630kVA Single Phase Pad Mounted Transformer during transit demands engineered packaging that safeguards its substantial weight and sensitive components. The unit is firmly secured to a reinforced, heat-treated wooden skid with heavy-duty bolts and vibration-dampening pads. High- and low-voltage bushings receive custom-molded protective caps and bracing, while the entire cabinet is shrouded in thick, waterproof polyethylene film. Additional foam blocks and corrugated reinforcements shield gauges, switches, and doors from impact. A sturdy, export-compliant wooden crate with steel banding and corner protectors fully encloses the assembly, incorporating moisture-absorbing desiccants and multi-axis shock indicators to document handling conditions and maintain oil integrity.
International and domestic shipping options prioritize reliability and timeline flexibility for this high-capacity padmount transformer. Ocean transport via 40ft high-cube or flat-rack containers ensures secure, cost-effective global delivery, with professional dunnage and tie-downs preventing movement during 20-50 day voyages. Air freight services expedite replacement units in 5-12 days for critical outages, utilizing chartered cargo holds. Overland shipments employ extendable low-bed trailers with certified escort vehicles to navigate route restrictions safely.
Full documentation suites accelerate clearance, featuring phytosanitary certificates, detailed weight manifests, and dielectric fluid safety sheets. Environmentally responsible measures include recyclable crate materials and optimized container loading to lower freight emissions. Clients receive dedicated tracking portals with real-time satellite updates and proactive alerts.
Final delivery coordination includes optional crane or roller offloading, post-transit visual inspections, and responsible disposal of packing materials to facilitate immediate pad placement. Consolidated shipments for utility fleets reduce expenses and environmental impact. This meticulous packing and shipping process delivers your 630kVA transformer ready for seamless integration, enhancing results in "heavy-duty pad-mounted transformer logistics" searches.
International and domestic shipping options prioritize reliability and timeline flexibility for this high-capacity padmount transformer. Ocean transport via 40ft high-cube or flat-rack containers ensures secure, cost-effective global delivery, with professional dunnage and tie-downs preventing movement during 20-50 day voyages. Air freight services expedite replacement units in 5-12 days for critical outages, utilizing chartered cargo holds. Overland shipments employ extendable low-bed trailers with certified escort vehicles to navigate route restrictions safely.
Full documentation suites accelerate clearance, featuring phytosanitary certificates, detailed weight manifests, and dielectric fluid safety sheets. Environmentally responsible measures include recyclable crate materials and optimized container loading to lower freight emissions. Clients receive dedicated tracking portals with real-time satellite updates and proactive alerts.
Final delivery coordination includes optional crane or roller offloading, post-transit visual inspections, and responsible disposal of packing materials to facilitate immediate pad placement. Consolidated shipments for utility fleets reduce expenses and environmental impact. This meticulous packing and shipping process delivers your 630kVA transformer ready for seamless integration, enhancing results in "heavy-duty pad-mounted transformer logistics" searches.
32
32 years of industry experience
Manufacturer Test
630kVA Single Phase Pad Mounted Transformer
Progress Test
Initial production stages for the 630kVA single-phase pad-mounted transformer focus on core validation through precise core loss and flux distribution testing on high-permeability steel sheets to guarantee minimal no-load consumption. Winding fabrication incorporates automated resistance checks and high-potential impulse testing between turns and layers to confirm insulation uniformity and withstand capability. Tank construction undergoes rigorous dimensional verification using 3D coordinate measurement and weld integrity scans via dye penetrant and X-ray methods. Early core-coil integration includes excitation current profiling at multiple flux levels and polarity confirmation to establish magnetic symmetry. Bushing and compartment assembly trials ensure precise alignment and gasket sealing for dead-front safety. Pressure and vacuum testing on the empty tank verifies structural resilience before fluid processing. Digital quality records with serialized component tracking support full traceability and adherence to ANSI manufacturing protocols throughout these foundational steps.
Design Tests
All transformer 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)
♦ 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
NPC Electric will tests made for quality control by the manufacturer on every device or representative samples, or on parts or materials as required, to verify during production that the product meets the design specifications. Factory Acceptance Testing for the 630kVA single-phase pad-mounted transformer opens with accurate turns ratio verification across all connection configurations using a high-precision ratiometer, achieving results within 0.3% of nominal values. No-load loss, magnetizing current, and core power factor are recorded at 90%, 100%, and 110% voltage to certify energy-efficient design performance. Winding resistance is measured at ambient and corrected to 75°C for precise copper loss calculations and thermal rise predictions. Insulation integrity tests include applied potential withstand at full BIL-related levels for one minute on both primary and secondary sides, plus insulation resistance exceeding 10,000MΩ at 5000V DC. Polarity, phasing, and vector confirmation align with schematic requirements. Oil samples taken post-processing undergo full dielectric breakdown, color, and interfacial tension analysis. These core electrical tests, conducted under controlled conditions with calibrated instrumentation, form the essential certification backbone per IEEE C57.12.90 protocols.
Routine Test - Leak Test
Purpose of Testing
The purpose of water leakage test is to check whether there is leakage in the equipment or system, to ensure that it has good sealing and safety during use. The integrity of the equipment can be verified by simulating the pressure or load conditions in the working environment.
Testing Equipment
Leakage current tester (e.g. Fluke, Hioki, Megger, etc.)
Voltage source (usually 500V, 1 KV or 2.5 KV, customized according to test requirements)
Temperature and humidity meter
Ground electrode
Voltage source (usually 500V, 1 KV or 2.5 KV, customized according to test requirements)
Temperature and humidity meter
Ground electrode
Pre-Test Preparation
Ensure that the test environment conditions are suitable for leak testing. Test between 20°C and 30°C. Relative humidity should be less than 75% to avoid moisture affecting the test equipment and results.
Test Progress
Connect the Test Instrument:
Properly connect the test equipment (such as a leak detector) to the pipe, container or sealing structure of the device under test.
Apply Test Voltage:
Apply the appropriate test pressure (e.g. 10 bar, 15 bar, etc.) depending on the equipment's operating pressure or test standard.
Properly connect the test equipment (such as a leak detector) to the pipe, container or sealing structure of the device under test.
Apply Test Voltage:
Apply the appropriate test pressure (e.g. 10 bar, 15 bar, etc.) depending on the equipment's operating pressure or test standard.
Measure and Record
Start the test and record the following parameters:
Applied test pressure
Leakage (can be monitored by flow meter or other equipment)
Time record (to ensure that the test time meets the standard requirements)
Initial pressure and final pressure (if any changes)
Applied test pressure
Leakage (can be monitored by flow meter or other equipment)
Time record (to ensure that the test time meets the standard requirements)
Initial pressure and final pressure (if any changes)
Check for leaks
Check for leaks on equipment surfaces and joints by using a foam detector, gas leak detector, or other suitable method.
Repeat Testing (if necessary)
If the test finds leakage or there is any doubt, repeat the test as necessary to verify the sealing of different locations or different equipment parts.
Evaluation Criteria (Reference)
No leakage (excellent): No leakage during the test, the equipment is completely sealed.
Minor leakage (good): Very small leakage is allowed, and it is necessary to judge whether it is qualified according to industry standards.
Minor leakage (good): Very small leakage is allowed, and it is necessary to judge whether it is qualified according to industry standards.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Extensively deployed in mixed-use urban developments and cooperative utility expansions, supporting both residential clusters and commercial facilities through efficient loop-feed underground networks.
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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