315kVA Single Phase Pad Mounted Transformer
315kVA Single Phase Pad Mounted Transformer, engineered for seamless integration into underground power distribution systems, particularly in residential and commercial loop-feed setups. This compact, oil-filled transformer utilizes advanced high-permeability steel cores and precision-engineered windings to offer exceptional energy efficiency, low operating temperatures, and reduced sound levels for discreet urban installations. Compliant with ANSI C57.12.38 and IEEE standards, this single-phase padmount transformer ensures reliable voltage conversion from primary voltages up to 34.5kV to standard secondary outputs like 120/240V, supporting radial or loop configurations with high short-term overload capability for growing communities.
- 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 small retail centers, schools, and community facilities, providing secure
- Power Rating 315kVA
- 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
315kVA Single Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 315kVA |
| 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
315kVA Single Phase Pad Mounted Transformer
The 315kVA Single Phase Pad Mounted Transformer provides extensive customization to align with utility specifications and regional grid demands in underground networks. Primary voltage ratings can be configured from 4.16kV to 34.5kV with corresponding BIL levels (up to 150kV), while secondary voltages include 120/240V three-wire, 240/480V, or dual-voltage options for versatile load servicing. Choose between aluminum or copper windings to balance efficiency, weight, and budget, with impedance ranges of 1.8-4.5% for optimized fault current management. High-voltage configurations support two or four-position load-break switches, integral bayonet fuses, or current-limiting backup protection, alongside elbow arresters for surge suppression. Low-voltage side options feature multiple stud terminals or clamp-type connectors to accommodate varying cable sizes and installation preferences.
Further personalization encompasses tank materials like mild steel with powder coating or stainless steel for corrosive environments, available in standard utility greens or custom colors. Fluid choices extend to conventional mineral oil or high-fire-point synthetic/natural esters for enhanced safety in densely populated areas. Additional features include liquid temperature gauges, pressure-vacuum indicators, drain valves with samplers, and wildlife protectors. Nameplates with barcoding, special grounding provisions, and seismic zoning qualifications ensure full compliance and traceability. These adaptable options position the transformer as a leading selection for "customizable 315kVA single-phase pad-mounted transformers" in modern utility procurement.
Packing and Shipping
315kVA Single Phase Pad Mounted Transformer
Securing the 315kVA Single Phase Pad Mounted Transformer for transport involves specialized packaging that protects its sensitive components and sealed integrity throughout the supply chain. The transformer is bolted to a heavy-duty palletized skid with integrated lifting lugs, then enveloped in thick anti-static shrink wrap to shield against dust and minor impacts. High- and low-voltage bushings are capped and braced with custom wooden supports, while the cabinet receives reinforced cardboard corner guards. A ventilated, fumigated wooden crate—certified under international plant quarantine standards—encases the unit, incorporating silica gel packets and shock-watch indicators to monitor environmental conditions and handling stresses, preserving the oil-filled system's reliability upon arrival.
Worldwide shipping options are designed for flexibility and security, catering to utility project schedules for this pad-mounted transformer. Standard sea freight utilizes 20ft containers with internal blocking and bracing to immobilize the load, offering economical rates and delivery windows of 18-45 days to major ports globally. Expedited air cargo services handle time-sensitive replacements in 4-10 days, focusing on component compatibility and rapid deployment. Domestic routes employ specialized step-deck trailers with hydraulic ramps for smooth loading and weatherproof tarps, ensuring compliance with height and weight regulations across regions.
Complete export paperwork streamlines the process, including commercial invoices, detailed dimension/weight manifests, and non-hazardous declarations for dielectric fluid to accelerate border crossings. Eco-friendly initiatives feature reusable skids and minimized plastic usage, with optional carbon-neutral shipping offsets. Clients access a secure online dashboard for live GPS tracking, milestone notifications, and direct support from logistics specialists.
Arrival services enhance transition to installation, providing optional forklift or crane offloading, immediate visual integrity checks, and eco-disposal of packaging materials. Bulk utility orders benefit from consolidated container loading to lower per-unit costs and synchronized deliveries. This integrated packing and shipping approach guarantees the 315kVA padmount transformer reaches its destination in optimal condition, supporting searches for "efficient single-phase pad-mounted transformer logistics."
Worldwide shipping options are designed for flexibility and security, catering to utility project schedules for this pad-mounted transformer. Standard sea freight utilizes 20ft containers with internal blocking and bracing to immobilize the load, offering economical rates and delivery windows of 18-45 days to major ports globally. Expedited air cargo services handle time-sensitive replacements in 4-10 days, focusing on component compatibility and rapid deployment. Domestic routes employ specialized step-deck trailers with hydraulic ramps for smooth loading and weatherproof tarps, ensuring compliance with height and weight regulations across regions.
Complete export paperwork streamlines the process, including commercial invoices, detailed dimension/weight manifests, and non-hazardous declarations for dielectric fluid to accelerate border crossings. Eco-friendly initiatives feature reusable skids and minimized plastic usage, with optional carbon-neutral shipping offsets. Clients access a secure online dashboard for live GPS tracking, milestone notifications, and direct support from logistics specialists.
Arrival services enhance transition to installation, providing optional forklift or crane offloading, immediate visual integrity checks, and eco-disposal of packaging materials. Bulk utility orders benefit from consolidated container loading to lower per-unit costs and synchronized deliveries. This integrated packing and shipping approach guarantees the 315kVA padmount transformer reaches its destination in optimal condition, supporting searches for "efficient single-phase pad-mounted transformer logistics."
32
32 years of industry experience
Manufacturer Test
315kVA Single Phase Pad Mounted Transformer
Progress Test
Manufacturing oversight for the 315kVA single-phase pad-mounted transformer commences with core material certification, including Epstein square tests to validate low hysteresis and eddy current losses in the electrical steel. Coil winding processes undergo layer-by-layer voltage surge comparisons to detect inter-turn shorts, complemented by resistance mapping for thermal balance. Cabinet fabrication incorporates dimensional laser scanning and door alignment checks to ensure tamper-resistant sealing and dead-front accessibility. Early active part assembly includes polarity verification and excitation current measurements at reduced voltage to baseline magnetic performance. Tank welding receives non-destructive ultrasonic and magnetic particle inspections for defect-free joints, followed by initial pressure testing to confirm structural readiness prior to oil filling. These systematic evaluations, logged digitally with barcode traceability, uphold stringent quality benchmarks throughout the initial phases.
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. Extended FAT encompasses induced voltage testing at elevated frequency with continuous partial discharge monitoring, limiting levels to industry-accepted thresholds for long-term insulation reliability. Load loss and regulation characteristics are derived from short-circuit method simulations. Functional verification includes multiple operations of primary elbow switches, bayonet fuse expulsion checks, and parking stand engagement to demonstrate safe loop-feed capabilities. Oil samples undergo dissolved gas analysis, acidity, and breakdown voltage testing post-processing. Sound level measurements in a semi-anechoic setup confirm quiet operation suitable for residential zones. Final comprehensive inspection reviews paint adhesion, labeling accuracy, compartment security features, and accessory completeness. Detailed test reports, graphs, and calibration certificates accompany the transformer, fully documenting compliance and readiness for field deployment in underground distribution systems.
Routine Test - Insulation Power Factor
Purpose of Testing
The purpose of testing the insulation power factor is to evaluate the dielectric loss of the insulation system in electrical equipment, and to determine whether issues such as moisture ingress, aging, or contamination are present. A high power factor value usually indicates insulation deterioration.
Testing Equipment
Insulation power factor tester (e.g., brands like Doble, Megger) Voltage source (typically 1 kV, 2.5 kV, or 10 kV or as the customer request standard) Temperature and humidity meter (for recording environmental conditions)
Pre-Test Preparation
De-energize tap changer the equipment and ensure it has been properly grounded and discharged. Make sure the bushings and terminal connections to prevent surface contamination from affecting test results. Perform the test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20–30°C). Calibrate and inspect the test instruments to ensure they are in good working condition.
Test Progress
Connect the Test Instrument: Connect the test equipment to the bushings or terminals of the equipment under test and ensure proper grounding. Apply Test Voltage: Select the appropriate test voltage according to the rated voltage of the equipment (e.g., 25 kV for high-voltage windings or as the request of the pad mounted transformer).
Measure and Record
Start the test and record the following parameters: Capacitive current (IC) Power current (IW) Power factor (PF) or dissipation factor (Tanδ) Capacitance Ambient temperature and humidity at the time of testing
Temperature Correction
Correct the measured power factor to the reference temperature (typically 20°C) for accurate evaluation.
Repeat Testing (if necessary)
Measure different windings (high-voltage, medium-voltage, low-voltage) and bushings separately for comparative analysis.
Evaluation Criteria (Reference)
Insulation power factor ≤ 0.5% (Excellent) 0.5% < Power factor ≤ 1% (Good) 1% (Further inspection or corrective action required) Test standard:IEEE C57.12.00 & IEEE C57.12.90 (Liquid-Immersed)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Widely used in mixed residential-commercial developments and rural cooperative networks, supporting both household loads and light business operations through reliable loop or radial underground feeds.
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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