167kVA Three Phase Pad Mounted Transformer
The 167kVA three phase pad mounted transformer delivers robust and efficient power distribution for medium-voltage applications. Built to exceed ANSI C57.12.34, IEEE, and DOE efficiency standards, this compartmental-type unit features a durable, tamper-resistant steel enclosure with dead-front or live-front high-voltage bushings, radial or loop feed configurations, and a 65°C average winding rise for optimal thermal performance. Primary voltages range from 4160V to 34500V (with common options like 12470GrdY/7200 or 13800V), while secondary voltages include 208Y/120V, 480Y/277V, or custom low-voltage setups.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2 or others
- Secondary Voltage Ratings 208GrdY/120;416GrdY/240 or Customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Loop Feed or Radial Feed
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, ASTM
- Application EV Charging
- Power Rating 167kVA
- Certificate UL
- 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
167kVA Three Phase Pad Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 167 kVA |
| Rating Primary Voltage | 4.16-34.5kV or customized |
| Secondary Voltage | 480GrdY/277 208GrdY/120 400GrdY/230 Customized（208Y/120 V to 4,160 V） |
| Frequency | 50/60Hz |
| Vector Group | Dyn1/Yyn0/Dyn11/Dyn5 |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE,Doe 2016,CAS Std or Customized |
| Impedance Voltage | Nominal 3.5% 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 | 3500 kg |
| Total Weight | 9700 kg |
| Outline Dimensions（L×W×H）in. | 2880×2200×2100（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(15kV) | Ground Strap |
| Grounding Copper Bar | Nameplate |
| 1"'Drain Valve With 3/8" Sampler | IR Window |
| 1" Upper Fill Valve Filter Press Connection | Terminal Box |
| Non-PCB decal | High Voltage Warning Signs |
Customization Optional
167kVA Three Phase Pad Mounted Transformer
Tailor the 167kVA three phase pad mounted transformer to your exact project specifications for maximum performance and compatibility. Select from a wide range of high-voltage ratings (e.g., 4160Δ, 12470GrdY/7200, 34500GrdY/19920) and low-voltage outputs (208Y/120V to 600Y/347V), with dual-voltage options and extended tap ranges for voltage regulation under varying loads. Choose between dead-front (200A bushing wells/inserts) or live-front designs, radial or loop feed arrangements, and mineral oil or environmentally friendly FR3 natural ester fluid for improved fire resistance and sustainability. Additional enhancements include K-factor ratings for non-linear loads, vacuum fault interrupters (VFI), lightning arresters, and advanced gauges (pressure/vacuum, oil temperature, liquid level).
Further personalize with enclosure upgrades such as stainless steel hinges, enhanced corrosion protection for coastal areas, seismic bracing for high-risk zones, or special paint colors. Integrate smart monitoring features like remote temperature sensors or differential protection relays. These flexible options allow seamless adaptation to commercial buildings, industrial plants, renewable energy sites, or municipal grids, ensuring compliance with IEEE, DOE, CSA, and UL standards while optimizing efficiency, safety, and longevity for your unique application.
Packing and Shipping
167kVA Three Phase Pad Mounted Transformer
NPC Electric's 167kVA three phase pad mounted transformer is carefully prepared for secure global delivery using industry-standard methods that prioritize protection against impacts, vibration, moisture, and environmental factors during transit. The complete unit – including tank, bushings, enclosure, and accessories – is mounted on a heavy-duty wooden pallet or skid with reinforced base supports. All protruding components, such as high-voltage bushings, gauges, and valves, are individually cushioned with foam or rubber padding and securely bolted to prevent shifting. The transformer is then wrapped in moisture-resistant plastic film and sealed to shield against humidity and dust.
For added protection, the entire assembly is encased in a sturdy wooden crate or reinforced case constructed from export-grade timber, fully compliant with international fumigation (ISPM-15) and phytosanitary requirements. Internal bracing and strapping ensure stability, while shock-absorbing materials minimize risks from road, rail, or sea transport vibrations. Lifting lugs remain accessible for safe crane handling, and all external surfaces receive temporary anti-corrosion coating. This packaging approach meets ANSI, IEEE, and export standards, safeguarding the transformer's integrity from factory to site.
Shipping options include containerized sea freight (20ft/40ft HC), flatbed truck for domestic/overland, or specialized heavy-haul carriers for oversized loads. We coordinate with trusted logistics partners to provide full tracking, insurance coverage, and timely customs documentation (commercial invoice, packing list, certificate of origin, test reports). For international shipments, export crating includes desiccant packs and humidity indicators to monitor conditions en route. Lead times vary by destination, with in-stock units often shipping within 1-2 weeks and custom models in 4-8 weeks.
Upon arrival, we recommend professional unloading using the provided lifting provisions and immediate inspection for any transit damage. Our packaging ensures the transformer arrives ready for concrete pad installation, minimizing on-site preparation and reducing overall project costs while maintaining full warranty coverage.
For added protection, the entire assembly is encased in a sturdy wooden crate or reinforced case constructed from export-grade timber, fully compliant with international fumigation (ISPM-15) and phytosanitary requirements. Internal bracing and strapping ensure stability, while shock-absorbing materials minimize risks from road, rail, or sea transport vibrations. Lifting lugs remain accessible for safe crane handling, and all external surfaces receive temporary anti-corrosion coating. This packaging approach meets ANSI, IEEE, and export standards, safeguarding the transformer's integrity from factory to site.
Shipping options include containerized sea freight (20ft/40ft HC), flatbed truck for domestic/overland, or specialized heavy-haul carriers for oversized loads. We coordinate with trusted logistics partners to provide full tracking, insurance coverage, and timely customs documentation (commercial invoice, packing list, certificate of origin, test reports). For international shipments, export crating includes desiccant packs and humidity indicators to monitor conditions en route. Lead times vary by destination, with in-stock units often shipping within 1-2 weeks and custom models in 4-8 weeks.
Upon arrival, we recommend professional unloading using the provided lifting provisions and immediate inspection for any transit damage. Our packaging ensures the transformer arrives ready for concrete pad installation, minimizing on-site preparation and reducing overall project costs while maintaining full warranty coverage.
32
32 years of industry experience
Manufacturer Test
167kVA Three Phase Pad Mounted Transformer
Progress test
During core and coil fabrication, rigorous progress inspections verify quality at key milestones. Core lamination stacking is checked for burr-free alignment, tightness, and proper clamping to minimize eddy current losses. Winding process monitoring includes turn count accuracy, insulation layer uniformity (thermally upgraded kraft paper), and conductor tension to prevent deformation. Vacuum drying and oil impregnation tests confirm moisture removal (<0.5% by weight) and complete penetration. Winding resistance and turns ratio preliminary measurements ensure phase balance (<2% deviation) and correct polarity/vector group. Visual and dimensional checks confirm compliance with design drawings before proceeding to tanking.
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
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
Full-wave impulse (BIL) test verifies lightning withstand capability. Partial discharge measurement ensures insulation quality (<10 pC at specified voltage). Functional checks cover tap changer operation (smooth transition, position indication), pressure relief valve activation, liquid level gauge accuracy, and all accessories (drain valve, sampling device). Leak test under pressure confirms hermetic sealing. Oil quality analysis (dielectric strength, moisture, DGA) is performed post-filling. Test data is documented in a certified report, including ambient conditions, ensuring the 167kVA pad mounted transformer meets all contract specifications before shipment.
Routine Test - DC Insulation Resistance Test
Purpose of Testing
The purpose of DC insulation resistance testing is to measure the insulation resistance of a device by applying a DC voltage, thereby evaluating the health of the insulation material and the voltage withstand capability of the electrical device. This test helps detect potential insulation aging, moisture or damage, preventing electrical failures in the device.
Testing Equipment
Insulation resistance tester (e.g. Megger, Fluke, Hioki, Klein Tools, etc.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Pre-Test Preparation
Make sure the device is properly grounded and fully discharged to prevent residual charge in the device from affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Test Progress
Connect the Test Instrument:
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Measure and Record
Start the test and record the following parameters:
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Temperature Correction
The measured insulation resistance values are corrected to a reference temperature (usually 20°C) for accurate evaluation.
Repeat Testing (if necessary)
Measure different windings (high voltage, medium voltage, low voltage) or each bushing separately, and conduct comparative analysis to ensure the insulation status of all parts.
Evaluation Criteria (Reference)
nsulation resistance ≥ 1000 MΩ (excellent)
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Perfect for renewable energy sites (solar/wind farms), data centers, hospitals, schools, and municipal infrastructure. Integrates with industrial plants, transportation hubs (airports/rail), and large-scale commercial developments, providing safe, tamper-resistant power conversion for critical loads and high-demand applications.
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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