50kVA Single Phase Pad Mounted transformer
NPC ELECTRIC 50 kVA pad mounted transformer meets/exceeds DOE 2016 efficiency ratings with UL/cUL listed. Design and production with ANSI/IEEE, CSA standards.NPC ELECTRIC Transformer's 50 kVA single-phase pad-mounted transformer is extensively employed in the North American market. With their wealth of project experience,NPC ELECTRIC Transformer caters to a diverse clientele, including builders, public utility departments, and transformer distributors and retailers.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2, 24.94, 26.25, 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 Std C57.12.38/CSA C227.3
- Application Ultility, Building, Residential area etc
- Power Rating 50kVA
- Certificate UL/cUL ,CESI , 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
50kVA Single Phase Pad Mounted transformer
Technical Specifications
Accessories
| Rated Power | 50 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 | 180 kg |
| Total Weight | 560 kg |
| Outline Dimensions（L×W×H）in. | 1000×900×600(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
50kVA Single Phase Pad Mounted transformer
NPC ELECTRIC’s single-phase pad-mounted transformers can be fully customized to meet your specific requirements.
The 50kVA Single Phase Pad Mounted Transformer offers a variety of optional specifications to tailor the unit to specific operational, environmental, and safety needs. These options include different insulating oil types, such as mineral oil or environmentally friendly biodegradable oils, to align with sustainability and safety requirements. For improved voltage regulation under varying load conditions, the transformer can be equipped with an on-load tap changer (OLTC).
Temperature monitoring systems can be installed to track the internal temperature, providing early detection of any overheating issues.
Additional protection features such as surge arresters, pressure relief valves, and fault indicators are available to enhance safety and minimize risk of failure. For installations in corrosive or harsh environments, corrosion-resistant coatings or weatherproof enclosures can be added to increase the durability and lifespan of the transformer.
These optional specifications ensure the 50kVA Single Phase Pad Mounted Transformer can be customized to meet specific requirements for optimal performance and reliability.
Packing and Shipping
50kVA Single Phase Pad Mounted transformer
Packaging for the 50kVA single phase pad mounted transformer employs export-grade wooden crates reinforced with steel strapping and internal timber supports to secure the compartmental tank and prevent shifting during transit. High-density foam padding, vibration-dampening mounts, and corner protectors shield bushings, doors, and fittings from impacts, while vacuum sealing, desiccant bags, and nitrogen pressurization protect insulating oil from moisture and oxidation. HV/LV compartments are individually covered, ports are tightly sealed, and partial oil drainage ensures transport safety. Detailed international labels specify handling instructions, weight distribution, sling points, and hazard classifications for secure global movement.
Shipping is customized for the transformer's size and weight, utilizing specialized lowboy trailers with heavy-duty chains and full weatherproof tarps for domestic overland routes to guard against environmental exposure. International shipments rely on flat-rack or open-top containers on ocean vessels with IMO-compliant lashing and corrosion preventives for prolonged marine transit. Continuous GPS satellite tracking and comprehensive cargo insurance provide real-time monitoring and financial protection. Strict compliance with ANSI, IEEE, and customs regulations accelerates clearance, enabling efficient delivery of the 50kVA single phase pad mounted transformer to project sites worldwide.
Sustainability drives packing decisions, incorporating responsibly sourced, recyclable timber and optimized crate loading to lower carbon footprint. Impact and tilt recorders on crates document handling conditions for post-arrival verification and claim resolution. Accessories such as arresters, fuses, or gauges are packaged separately with itemized checklists for onsite reconciliation. Proven carriers specializing in pad-mounted equipment secure necessary permits and adhere to rigorous safety standards across diverse land and sea routes.
Upon arrival, comprehensive support includes pad foundation alignment guidance, step-by-step unpacking procedures, oil refilling protocols, and termination torque recommendations. Coordination with local installation teams ensures safe handling and rapid commissioning. This end-to-end logistics strategy preserves transformer quality, expedites deployment, and supports reliable underground residential power infrastructure.
Shipping is customized for the transformer's size and weight, utilizing specialized lowboy trailers with heavy-duty chains and full weatherproof tarps for domestic overland routes to guard against environmental exposure. International shipments rely on flat-rack or open-top containers on ocean vessels with IMO-compliant lashing and corrosion preventives for prolonged marine transit. Continuous GPS satellite tracking and comprehensive cargo insurance provide real-time monitoring and financial protection. Strict compliance with ANSI, IEEE, and customs regulations accelerates clearance, enabling efficient delivery of the 50kVA single phase pad mounted transformer to project sites worldwide.
Sustainability drives packing decisions, incorporating responsibly sourced, recyclable timber and optimized crate loading to lower carbon footprint. Impact and tilt recorders on crates document handling conditions for post-arrival verification and claim resolution. Accessories such as arresters, fuses, or gauges are packaged separately with itemized checklists for onsite reconciliation. Proven carriers specializing in pad-mounted equipment secure necessary permits and adhere to rigorous safety standards across diverse land and sea routes.
Upon arrival, comprehensive support includes pad foundation alignment guidance, step-by-step unpacking procedures, oil refilling protocols, and termination torque recommendations. Coordination with local installation teams ensures safe handling and rapid commissioning. This end-to-end logistics strategy preserves transformer quality, expedites deployment, and supports reliable underground residential power infrastructure.
32
32 years of industry experience
Manufacturer Test
50kVA Single Phase Pad Mounted transformer
Progress Test
NPC Electirc manufacture pad mounted transformer have the strict quality control. The Progress Test for a 50kVA Single Phase Pad Mounted Transformer is conducted at various stages during the manufacturing process to ensure the transformer meets all design, safety, and performance specifications. These tests include checking the integrity of key components like the core insulation and winding resistance, as well as verifying the dielectric strength to ensure the transformer can handle electrical stresses. Electrical tests, such as insulation resistance and turns ratio tests, are performed to confirm proper functionality. The transformer’s protection devices, such as bushings and surge arresters, are also tested to ensure they operate correctly. Additionally, simulated load conditions are applied to assess the transformer’s performance and efficiency. Any issues identified during the progress tests are addressed before the final Factory Acceptance Test (FAT), ensuring that the 50kVA Single Phase Pad Mounted Transformer is built to meet the highest quality and reliability standards. Cooling circulation in tank and fins confirms unobstructed paths. Compartment wiring insulation surpasses 1000 megohms at test voltage. Protective coordination simulates fault response timing. Progress reports align with ANSI/IEEE C57.12.34 and DOE guidelines, supporting final refinements before oil impregnation and enclosure sealing.
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)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated 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.
The Transformer Factory Acceptance Test (FAT) for a 50kVA Single Phase Pad Mounted Transformer is a comprehensive process designed to ensure the transformer meets all technical specifications and safety standards before being shipped to the customer. The FAT includes several critical tests:
Visual Inspection: A thorough check to ensure that all components are correctly assembled, labeled, and free from any physical defects.
Electrical Testing: This involves measuring the winding resistance, insulation resistance, and conducting turns ratio tests to confirm proper electrical configurations and functionality.
Protection Device Testing: The proper functionality of protection devices such as surge arresters, tap changers, and fault indicators is verified to ensure safety during operation.
The FAT ensures that the 50kVA Single Phase Pad Mounted Transformer is fully operational, safe, and compliant with industry standards, providing the customer with confidence in the reliability and durability of the transformer once it is installed.
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
Suitable for rural residential expansions paired with small developments, this 50kVA single phase pad mounted transformer supports farmsteads, cabins, pumps, and security loads, delivering efficient, secure underground distribution in semi-rural areas prioritizing reliable single-phase supply and minimal visual impact.
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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