15kVA Single Phase Pad Mounted transformer
The 15 kVA single phase pad mounted transformer operates safely, reliably, and efficiently and can be installed indoors and outdoors. This type of transformer has a low operating cost, is environmentally friendly, easy to install, and has a low purchase cost, so it is widely used in residential, commercial, and other public.
- 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, CSA, DOE, UL
- Application Industry, Utility, Constuction
- Power Rating 15kVA
- Certificate UL/cUL ,CESI ,CSA
- 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
15kVA Single Phase Pad Mounted transformer
Technical Specifications
Accessories
| Rated Power | 15 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 | 90 kg |
| Total Weight | 295 kg |
| Outline Dimensions（L×W×H）in. | 1000×900×700(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
15kVA Single Phase Pad Mounted transformer
Adapt the 15kVA single phase pad mounted transformer to diverse underground utility specifications with flexible configurations that prioritize safety and efficiency. Primary voltage options encompass grounded wye setups from 2400V to 34500V, including common ratings like 4160GrdY/2400, 12470GrdY/7200, 24940GrdY/14400, or 34500GrdY/19920, paired with secondary voltages such as 120/240V, 240/480V, 277V, or customized low-voltage for regional needs. Winding materials feature aluminum for reduced weight and installation ease or copper for enhanced conductivity in sustained residential loads. Enclosure designs support dead-front ANSI Type-1 or Type-2 compartmental styles with low-profile shrubline aesthetics to minimize visual impact. Tap changers include 5-position external adjustments (±2x2.5%) for voltage regulation, while impedance ranges from 2% to 5% optimize fault current management. Protective integrations like bayonet fuses, expulsion links, lightning arresters, or wildlife barriers address local hazards, and natural ester fluids offer eco-friendly alternatives with superior fire resistance. These tailored elements improve energy performance, surge withstand, and pad integration, delivering a compliant transformer suited for underground residential applications focused on reliability and cost savings.
Further refinements include enclosure coatings resistant to corrosion in humid or coastal zones, reinforced bases for seismic stability, or accessory additions such as liquid level gauges, oil temperature indicators, and secondary spade terminals for streamlined cabling. Bushing BIL ratings up to 125-150kV accommodate surge-prone areas, and minor capacity proximity supports slight load expansions. Core optimizations lower no-load losses for greater efficiency, while drip shields and removable panels facilitate maintenance. These extensive customizations establish the 15kVA single phase pad mounted transformer as a versatile, user-oriented choice, ensuring seamless, standards-compliant power delivery with reduced lifecycle expenses and superior longevity in underground residential distribution.
Packing and Shipping
15kVA Single Phase Pad Mounted transformer
Packaging for the 15kVA single phase pad mounted transformer uses export-certified wooden crates reinforced with steel bands and internal timber bracing to secure the compartmental enclosure and prevent shifting. Dense foam cushioning, vibration-dampening pads, and corner protectors shield bushings, doors, and fittings from impacts, while vacuum sealing, desiccant bags, and nitrogen pressurization protect insulating oil from humidity and oxidation. HV/LV compartments are individually covered, ports tightly sealed, and partial oil drainage ensures transport safety. Detailed international labels specify handling instructions, weight balance, sling points, and hazard classifications for secure global shipment.
Shipping logistics accommodate the transformer's compact dimensions, employing enclosed trailers or flatbeds with heavy securement chains and protective tarps for domestic overland transport to guard against dust and precipitation. International consignments utilize 20-foot containers with proper bracing and IMO-compliant lashing, plus corrosion inhibitors for marine exposure. Satellite GPS tracking and comprehensive cargo insurance deliver real-time monitoring and protection. Adherence to ANSI, IEEE, and customs protocols streamlines clearance, supporting prompt delivery of the 15kVA single phase pad mounted transformer worldwide.
Sustainability informs packing decisions, incorporating recyclable wood and efficient load configurations to cut emissions. Transit impact recorders on crates document handling forces for arrival condition verification and claim resolution. Accessories like arresters, fuses, or gauges ship in separate labeled boxes with itemized checklists for onsite reconciliation. Trusted carriers specializing in pad-mounted equipment secure heavy-haul permits and prioritize safety across varied routes.
Final delivery coordination provides pad site alignment guidance, step-by-step unpacking procedures, oil refilling protocols, and termination torque recommendations. This structured end-to-end process safeguards product quality, expedites installation, and facilitates rapid commissioning in underground residential power systems.
Shipping logistics accommodate the transformer's compact dimensions, employing enclosed trailers or flatbeds with heavy securement chains and protective tarps for domestic overland transport to guard against dust and precipitation. International consignments utilize 20-foot containers with proper bracing and IMO-compliant lashing, plus corrosion inhibitors for marine exposure. Satellite GPS tracking and comprehensive cargo insurance deliver real-time monitoring and protection. Adherence to ANSI, IEEE, and customs protocols streamlines clearance, supporting prompt delivery of the 15kVA single phase pad mounted transformer worldwide.
Sustainability informs packing decisions, incorporating recyclable wood and efficient load configurations to cut emissions. Transit impact recorders on crates document handling forces for arrival condition verification and claim resolution. Accessories like arresters, fuses, or gauges ship in separate labeled boxes with itemized checklists for onsite reconciliation. Trusted carriers specializing in pad-mounted equipment secure heavy-haul permits and prioritize safety across varied routes.
Final delivery coordination provides pad site alignment guidance, step-by-step unpacking procedures, oil refilling protocols, and termination torque recommendations. This structured end-to-end process safeguards product quality, expedites installation, and facilitates rapid commissioning in underground residential power systems.
32
32 years of industry experience
Manufacturer Test
15kVA Single Phase Pad Mounted transformer
Progress test
The progress test for a 15kVA Single Phase Pad Mounted Transformer typically involves a series of inspections and tests conducted throughout the manufacturing process to ensure the transformer meets all required standards and specifications. This includes verifying the integrity of the core and winding assembly, checking insulation resistance, conducting high voltage testing, and performing load and temperature rise tests. These tests are designed to confirm that the transformer operates efficiently, safely, and reliably under its rated conditions. The progress test may also include mechanical checks such as the inspection of the enclosure, tap changer functionality, and the proper installation of accessories like bushings and cooling systems. ore clamping force is torque-verified to maintain stability, and vibration exposure simulates logistics stresses. Oil batch certification confirms dielectric strength exceeding 35kV and minimal moisture/acidity. Enclosure compartmental welds undergo penetrant and ultrasonic inspection for leak-free construction, while pad mounting base experiences dimensional accuracy and load capacity trials.
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)
♦ Applied Voltage
♦ 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 15kVA Single Phase Pad Mounted Transformer is a comprehensive series of tests performed at the manufacturer’s facility to verify that the transformer meets the required design specifications and operates safely and efficiently. The FAT typically includes electrical tests such as insulation resistance, dielectric strength, and turns ratio tests. Additionally, mechanical checks are performed to ensure the integrity of the transformer’s construction, including verifying the enclosure, bushings, and cooling systems. The transformer’s load capacity, voltage regulation, and temperature rise are also tested under simulated operating conditions. The goal of the FAT is to ensure that the transformer is ready for delivery and meets all performance, safety, and quality standards before it is shipped to the customer.
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
The 15kVA single phase pad mounted transformer thrives in low-density residential underground networks combined with suburban homes, stepping down medium voltage to 120/240V for individual houses, lighting, appliances, and small loads with tamper-resistant, aesthetic pad installation.
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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