30kVA Single Phase Pole Mounted Transformer
NPC Electric's 30kVA Single Phase Pole Mounted Transformer is a compact, high-efficiency single-phase distribution transformer designed for overhead pole installation in 50/60Hz AC rural and suburban networks, with primary voltages up to 35kV (common 12.47kV/13.2kV/13.8kV/34.5kV) and secondary at 120/240V or 240/480V split-phase. It utilizes a hermetically sealed cylindrical tank with high-strength steel construction and radiator fins for natural oil circulation (ONAN cooling), providing excellent thermal management, corrosion resistance via epoxy coatings, and a maintenance-free lifespan over 25 years. Featuring low-loss grain-oriented silicon steel core for reduced no-load losses (typically 100-150W), high-purity copper windings, and premium mineral insulating oil (IEC 60296 compliant, dielectric strength >45kV/2.5mm), it minimizes load losses (around 500-700W at 75°C), supports overloads up to 125% continuous, operates quietly (<50dB), and achieves efficiency >98.5%. Compliant with IEEE C57.12.20, ANSI C57.12.28, DOE efficiency standards, and CSA C2.1, this transformer optimizes energy distribution, lowers operational costs, and enhances reliability for single-phase residential, farm, and light commercial loads.
- Primary Voltage Ratings 220V, 2.4kV,11kV, 33kV, 34.5kV
- Secondary Voltage Ratings 480-240/240-120 or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Conventional Type
- BIL 30-150kV
- Standards IEEE, ANSI, NEMA, ASTM
- Application farm irrigation power, small commercial users
- Power Rating 30kVA
- Certificate CE, ISO
- Cooling Method ONAN, KNAN
- Oil Mineral Oil or FR3
- Opeartion Step Down
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
30kVA Single Phase Pole Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 30 kVA |
| Rating Primary Voltage | 12.4-34.5kV |
| 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 | 108 kg |
| Total Weight | 580 kg |
| Outline Dimensions（W×D×H） | 765×860×1305 (mm) |
| Lifting Lug |
| Tap Changer |
| Pressure Relief Valve |
| Tank Cover and clamp |
| L.V Bushing |
| HV Bushing |
| Ground Strap |
| Nameplate |
| Non-PCB decal |
| High Voltage Warning Signs |
| Suport lug |
| Oil fill valve |
Customization Optional
30kVA Single Phase Pole Mounted Transformer
NPC Electric 30kVA single phase pole mounted transformer offers versatile customization to fit specific utility standards, voltage requirements, and environmental conditions. Primary voltages can be tailored to 12.47kV, 13.2kV, 13.8kV, 24.94kV, or 34.5kV, with secondary split-phase outputs at 120/240V, 240/480V, or custom single voltages like 277V for specialized applications. Tap changers include off-circuit types with ±2×2.5% or ±5% steps for voltage fine-tuning, or manual adjustable taps for field adaptability. Core materials feature standard grain-oriented silicon steel for cost-effective low losses or high-efficiency variants to further reduce no-load consumption by 20-30%. Winding options include copper for enhanced conductivity and longevity in high-humidity areas or aluminum for lighter weight and budget optimization without compromising performance. Further personalization encompasses tank designs with additional radiator fins for hot climates (up to +50°C ambient), eco-friendly insulating oils (bio-based per IEC 61099 for reduced fire risk), and enclosure upgrades like wildlife guards, anti-corrosion galvanized steel, or UV-resistant powder coatings for coastal or polluted environments.
Accessories integrate lightning arresters (MOV type), high/low voltage fuses, bayonet expulsion fuses, load-break switches, and metering provisions for smart grid compatibility. Impedance levels (1.5-4%), BIL insulation (60-200kV based on voltage class), frequency (50/60Hz), and compliance with IEEE, ANSI, DOE, or regional standards (e.g., NEMA, CSA) are fully adjustable. Mounting hardware can include extended brackets for various pole diameters, grounding straps, or anti-theft locks. Our team collaborates to deliver solutions for rural electrification, farm irrigation, small business power, or solar integrations, focusing on DOE efficiency tiers, minimal energy waste, and reliable single-phase service.
Packing and Shipping
30kVA Single Phase Pole Mounted Transformer
Protecting the 30kVA single phase pole mounted transformer during transport is essential to maintain its compact design, oil integrity, and mounting hardware from damage due to vibration, impacts, or weather exposure. Pre-packing inspections verify tank seals, pressure tests (positive hold at 0.02-0.05MPa), bushing integrity, oil dielectric sampling (>45kV/2.5mm), and accessory securement. Units ship oil-filled under nitrogen blanket to prevent moisture, with smaller models fully assembled; for bulk shipments, accessories like arresters and fuses are detached and protected separately to reduce weight under 500kg limits.
Individual components receive specialized packaging: bushings wrapped in foam-lined boxes, radiators shielded with corrugated padding, fuses and switches in sealed pouches with desiccants. The main tank mounts on ISPM-15 compliant wooden pallets or steel frames with custom strapping, shock-absorbing cushions, and anti-tilt bracing rated for 3-4g forces. Weatherproof shrink-wrap, corrosion inhibitors, and humidity indicators are standard, along with tilt/shock recorders for transit monitoring.
For international shipping—common for utility exports—the transformer loads into standard 20ft/40ft containers or flat-racks with IMO-compliant tie-downs, salt-resistant covers, and fumigation-free treatments; overland uses flatbed trucks with tarps and secure chaining at lifting lugs. Documentation includes packing lists, invoices, origin certificates, test reports, dimensional diagrams, oil SDS, handling guides, and HS codes (8504.21 for single-phase transformers <650kVA).
We coordinate full logistics, offering FOB/CIF terms, customs support, insurance, and add-ons like third-party inspections, on-site delivery supervision, crane unloading at pole sites, oil top-up, and installation checks. This ensures safe, compliant arrival worldwide for rural and suburban deployments
Individual components receive specialized packaging: bushings wrapped in foam-lined boxes, radiators shielded with corrugated padding, fuses and switches in sealed pouches with desiccants. The main tank mounts on ISPM-15 compliant wooden pallets or steel frames with custom strapping, shock-absorbing cushions, and anti-tilt bracing rated for 3-4g forces. Weatherproof shrink-wrap, corrosion inhibitors, and humidity indicators are standard, along with tilt/shock recorders for transit monitoring.
For international shipping—common for utility exports—the transformer loads into standard 20ft/40ft containers or flat-racks with IMO-compliant tie-downs, salt-resistant covers, and fumigation-free treatments; overland uses flatbed trucks with tarps and secure chaining at lifting lugs. Documentation includes packing lists, invoices, origin certificates, test reports, dimensional diagrams, oil SDS, handling guides, and HS codes (8504.21 for single-phase transformers <650kVA).
We coordinate full logistics, offering FOB/CIF terms, customs support, insurance, and add-ons like third-party inspections, on-site delivery supervision, crane unloading at pole sites, oil top-up, and installation checks. This ensures safe, compliant arrival worldwide for rural and suburban deployments
32
32 years of industry experience
Manufacturer Test
30kVA Single Phase Pole Mounted Transformer
Progress Test
Progress testing for the 30kVA single phase pole mounted transformer begins with silicon steel core sheet inspection for lamination thickness uniformity coating quality magnetic orientation and edge smoothness via Epstein tester to ensure low no-load losses then core assembly progress verifies mitered joint precision clamping pressure balance and vibration resistance. Winding process progress monitors copper conductor resistivity insulation wrapping tension uniformity turn count accuracy and dielectric layer withstand after completion. Core-coil insertion progress confirms clearances spacer materials end-turn support and mechanical stability for overhead installation. Tank fabrication progress examines cylindrical welding seams hydrostatic pressure holds surface preparation galvanized coating thickness and weatherproofing validation pre-assembly progress checks bushing arrester fuse alignment accessory mounting and initial vacuum simulation to identify defects early advancing to full testing phases.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ 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
♦ 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
Load loss impedance voltage tests for the 30kVA single phase pole mounted transformer apply reduced voltage short secondary compute losses impedance (1.5-4%) efficiency at 75°C for regulation. Oil routine verifies dielectric (>45kV/2.5mm) water (<30ppm) acidity DGA baseline. Temperature rise simulation confirms limits (<65K). Functional checks include relief valve arrester fuse operation sound level (<50dB). Mechanical validation tank pressure leak-free bushing wiring. FAT reports calibration optional witnessing certify IEEE C57.12.20 compliance routine tests prior to release.
Routine Test - Applied Voltage
Purpose of Testing
The purpose of testing the applied voltage is to verify the insulation strength of the transformer by applying a voltage higher than its normal operating level, ensuring it can withstand potential electrical stresses. This test helps identify any weaknesses or defects in the insulation system before the transformer is put into service.
Testing Equipment
Test equipment: High voltage tester (e.g. TTR, Hipot, etc.)
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Pre-Test Preparation
Disconnect the device from the power supply and make sure it is properly grounded and discharged.
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Measure and Record
Start the test and record the following parameters:
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Temperature Correction
If necessary, the measured data is temperature corrected to ensure that it corresponds to standard temperature conditions (usually 20°C).
Repeat Testing (if necessary)
Multiple tests were conducted on different windings (high voltage, medium voltage, low voltage) and bushings, and comparative analysis was performed.
Evaluation Criteria (Reference)
The test was normal and the equipment performed well (qualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
Observing electrical behavior
Observe the electrical behavior of the device under test to ensure that there are no abnormal currents, arcing, noise, or electrical faults.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
It is suitable for various combined scenarios such as rural residential power supply, farm irrigation power, small commercial users, suburban street lighting systems, small photovoltaic access, light industrial workshops, and telecommunications base stations, providing 30kVA single-phase reliable voltage conversion and efficient low-loss distribution.
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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