Engineered for Resilience: Modernize Your Grid with Our Three Phase Pad-Mounted Transformer.
01 General
1.1 Project Description
1500 kVA three phase pad mounted transformer was delivered to Canada in 2025. The rated power of the transformer is 1500 kVA with KNAN cooling. The high voltage is 13.8GRDY/7.97 kV with ±2*2.5% tapping range (NLTC), the low voltage is 0.6Y/0.346 kV, they formed a vector group of YNyn0.
This three-phase pad-mounted transformer is designed for high-performance power distribution, utilizing environmentally friendly FR3 natural ester oil and engineered with a K-factor of 4 to handle harmonic-rich loads. It features a comprehensive protection system including an internal grounding screen between windings and integrated lightning arresters. The high-voltage side is equipped with a 600A unified plug-in bushing system and a separate porcelain neutral bushing with a 2-hole spade-type copper bar. The low-voltage side employs resin bushings with a 10-hole copper bar assembly and includes two dedicated neutral bushings. Additionally, it is fitted with two grounding bushings: one for the HV-LV grounding screen and another for the neutral point connection. The unit is protected by a nitrogen blanket and is finished in a standard Equipment Green (Munsell 9 GY 1.5/2.6) coating for durability and corrosion resistance.
1.2 Technical Specification
1500 kVA Pad Mounted Transformer Price specifications type and data sheet
| Delivered to | USA |
| Year | 2025 |
| Type | Pad mounted transformer |
| Standard | IEEE C57.12.34 |
| Rated Power | 1500 kVA |
| Frequency | 60HZ |
| Phase | 3 |
| Feed | Loop |
| Front | Dead |
| Cooling Type | KNAN |
| Primary Voltage | 13.8GRDY/7.97 kV |
| Secondary Voltage | 0.6Y/0.346 kV |
| Winding Material | Aluminum |
| Angular displacement | YNyn0 |
| Impedance | 5.75% |
| Efficiency | DOE2016，99.48% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 1.6 kW |
| On Load Loss | 10.27 kW |
1.3 Drawings
1500 kVA Pad Mounted Transformer Price diagram drawing and size.
02 Manufacturing
2.1 Core
| The three-phase, five-limb core of this Pad Mounted Transformer Price is constructed from high-permeability silicon steel laminations. Its unique design features three main limbs for housing the three sets of windings, flanked by two additional outer yoke limbs. This configuration provides a low-reluctance path for third harmonic magnetic flux, effectively reducing no-load losses and operating noise. Furthermore, it significantly enhances the transformer’s capability to withstand unbalanced loads and manage harmonic currents. |  |
2.2 Winding
 | The transformer features differentiated winding designs for high and low voltages. The low-voltage winding utilizes copper foil, which provides excellent short-circuit withstand strength and efficient heat dissipation due to its large surface area and uniform winding structure. The high-voltage winding is constructed with flat aluminum wire wound, enhancing space efficiency, improving impulse voltage distribution, and increasing heat dissipation. Both windings are vacuum-dried and impregnated with insulating oil, then securely assembled within a robust sealed tank, ensuring high mechanical strength, reduced losses, and long-term operational reliability. |
2.3 Tank
| The tank is constructed from high-strength, corrosion-resistant steel to ensure durability and long service life in outdoor environments. It is hermetically sealed to prevent moisture ingress and filled with insulating oil that provides both electrical insulation and efficient cooling. The tank features reinforced walls design, allowing it to withstand internal pressure fluctuations and mechanical stresses while maintaining a compact footprint. Additionally, it is equipped with external cooling fins to enhance heat dissipation, ensuring stable operation under varying load conditions. Accessories such as pressure relief devices, fill valves, and grounding pads are integrally mounted for safety and functionality. |  |
2.4 Final Assembly
 | The final assembly involves the precise integration of the core and coil assembly, insulating oil, and all critical accessories into a single, robust unit. The fully wound and dried core-coil assembly is carefully lowered into a sealed, corrosion-resistant steel tank, which is then vacuum-filled with dielectric insulating oil to eliminate any moisture or air. Key components such as external radiators, primary and secondary bushings, tap changers, pressure relief devices, and protective wiring are meticulously mounted and connected. The entire assembly is housed within a lockable, weatherproof steel enclosure designed for safety, durability, and direct installation in outdoor environments, completing a compact and reliable power distribution solution. |
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | % | Maximun resistance unbalance rate | 2.68 | Pass |
| 2 | Ratio Tests | % | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: YNyn0 | -0.04% ~ 0.02% | Pass |
| 3 | phase-relation tests | / | YNyn0 | YNyn0 | Pass |
| 4 | No-load losses and excitation current | / | I0 :: provide measured value | 0.29% | Pass |
| P0: provide measured value（t:20℃） | 1.563kW | ||||
| the tolerance for no load loss is +10% | / | ||||
| 5 | Load losses impedance voltage and efficiency | / | t:85℃ the tolerance for impedance is ±7.5% the tolerance for total load loss is +6% | / | Pass 合格 |
| Z%: measured value | 5.95% | ||||
| Pk: measured value | 9.867kW | ||||
| Pt: measured value | 11.430 kW | ||||
| Efficiency not less than 99.48% | 99.50% | ||||
| 6 | Applied Voltage Test | kV | LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | kV | Applied voltage (KV):2Ur | No collapse of the test voltage occurs | Pass |
| Duration(s):48 | |||||
| Frequency (HZ): 150 | |||||
| 8 | Leakage Test | kPa | Applied pressure：20kPA | No leakage and no Damage | Pass |
| Duration：24h | |||||
| 9 | Insulation Resistance Measurement | GΩ | HV-LV to Ground : | 0.887 | / |
| LV-HV to Ground: | 1.14 | ||||
| HV&LV to Ground | 0.623 | ||||
| 10 | Lightning impulse test | kV | full wave | No collapse of the test voltage occurs | Pass |
04 Packing and Shipping
4.1 Packing
First, lay a layer of tin foil bag on the transformer tray and cover the transformer with it. Put desiccant into the tin foil bag, then seal the bag while leaving an opening. Use a vacuum cleaner to extract the gas from the bag through this opening, and then seal the opening with a sealing machine. Next, install corner protectors around the transformer (the corner protector materials can be foam, plastic or cardboard corner protectors, and the cardboard corner protectors are made of special pressed cardboard), and wrap the transformer with a protective film. Finally, carry out the external wooden box packaging, and the wooden box should be sprayed with forklift marks and center of gravity marks. |  |
4.2 Shipping
 | The transformer will be shipped under DDU (Delivered Duty Unpaid) terms to the final destination. The transformer, securely crated and blocked within an ocean freight container to prevent shifting, will be transported via a combination of ocean freight and final truck transport. The seller assumes all risks and costs, including inland transportation, export clearance, international ocean freight, import customs clearance, all applicable duties/taxes (excluding U.S. import duties/taxes, which are for the buyer’s account per DDU terms), final road delivery, and full insurance coverage. Delivery is completed only when the unit is safely offloaded and presented at the designated receiving point at the destination address. |
05 Site And Summary
As a core component of modern distribution networks, our three-phase pad-mounted transformers integrate robust design, superior craftsmanship, and rigorous testing to ensure long-term, reliable performance in diverse and demanding environments. We are committed to delivering not just products, but total power solutions and full-lifecycle technical support. Choosing our solutions means investing in safety, efficiency, and durability-empowering you to build a more resilient and intelligent distribution system.
