Reliable Power, Safely Grounded – Our Pad-Mounted Transformers Keep You Running.
01 General
1.1 Project Description
1500 kVA three phase pad mounted transformer was delivered to Jamaica in 2025. The rated power of the transformer is 1500 kVA with ONAN cooling. The primary voltage is 23.9GrdY/13.8 kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.416y/0.24 kV, they formed a vector group of YNyn0.
This 1500kVA pad-mounted transformer is a robust, oil-filled distribution unit designed for reliable underground and outdoor power applications. Encased in a weatherproof, corrosion-resistant steel enclosure, it features essential safety and operational components, including bayonet fuses and current-limiting fuses for overload protection, a pressure relief device and vacuum pressure gauge for internal pressure monitoring, and an oil thermometer with liquid level indicator for optimal thermal management. The unit is equipped with a load break switch and insert with dust cap for safe load switching, along with an off-circuit changer for voltage adjustment. Ideal for urban power grids, industrial sites, and renewable energy integration, this transformer ensures high efficiency, low maintenance, and compliance with industry safety standard. Its compact, tamper-resistant design delivers dependable power distribution while supporting future smart grid connectivity.
1.2 Technical Specification
1500 kVA pad mounted transformer price specifications type and data sheet
| Delivered to | Jamaica |
| Year | 2025 |
| Type | Pad mounted transformer |
| Standard | IEEE StdC57.12.34-2022 |
| Rated Power | 1500 kVA |
| Frequency | 50HZ |
| Phase | 3 |
| Feed | Loop |
| Front | Dead |
| Cooling Type | ONAN |
| Primary Voltage | 23.9GrdY/13.8 kV |
| Secondary Voltage | 0.416y/0.24 kV |
| Winding Material | Aluminum |
| Angular displacement | YNyn0 |
| Impedance | 5% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 1.8 kW |
| On Load Loss | 16.8 kW |
| Accessories | Standard Configuration |
1.3 Drawings
1500 kVA pad mounted transformer price diagram drawing and size.
02 Manufacturing
2.1 Core
| The five-limb structure (three main limbs + two return limbs) improves flux symmetry, minimizing unbalanced magnetic pull and reducing no-load losses. Better handling of harmonic currents and DC bias in modern power grids. The stacked laminated silicon steel core reduces eddy current losses, resulting in quieter operation-ideal for urban installations. Robust core construction withstands short-circuit forces, enhancing transformer reliability. Optimized flux path reduces heat generation, improving thermal management in the oil-filled tank. |  |
2.2 Winding
 | The 1500 kVA pad mounted transformer price features an advanced foil-wound LV (low-voltage) winding and layer-wound HV (high-voltage) winding design, ensuring optimal performance and reliability. The LV winding utilizes high-conductivity copper foil, providing excellent short-circuit withstand capability and efficient heat dissipation. The HV winding employs precision-layer-wound copper conductors with interlayer insulation, delivering enhanced voltage distribution and impulse strength. Critical to the design are angle ring, strategically placed at winding ends and stress points to control electric field distribution, minimize partial discharge, and improve dielectric strength. The combination of foil-wound LV and layer-wound HV windings, along with reinforced insulation and angle rings, ensures high efficiency, thermal stability, and long-term durability in demanding power distribution applications. |
2.3 Tank
| The tank of the three-phase pad-mounted transformer is precision-engineered from low-carbon steel plates (Q235B) through a rigorous manufacturing process. It begins with CNC laser cutting and bending for dimensional accuracy, followed by submerged arc welding (SAW) of main seams, which undergo X-ray/ultrasonic inspection to ensure structural integrity. The tank surface is shot-blasted (Sa2.5 grade) and treated with a multi-layer anti-corrosion coating system, including epoxy primer (80–100 μm) and polyurethane topcoat (60–80 μm) for weather resistance. Prior to assembly, the tank is subjected to a 50 kPa pressure test and helium leak detection to verify airtightness. This robust, leak-proof design ensures a service life exceeding 30 years, complying with IEEE C57.12.25 and IEC 60076 standards. |  |
2.4 Final Assembly
 | 1. Winding Installation and Core Assembly: Remove the upper yoke laminations of the core, then install the HV/LV windings onto the core legs, ensuring proper insulation alignment and mechanical fixation. Key Step: Reinsert the upper yoke laminations one by one in an interleaved manner to minimize magnetic reluctance. Secure with clamping fixtures and verify core grounding and no-load loss. 2. Electrical Connections: Complete lead welding or bolted connections, install tap changers, and wrap insulation materials. 3. Core and Coil Drying: Place the entire active part into a drying oven for vacuum heating to remove moisture. Remove once insulation resistance meets standards. 4. Tank Assembly: Hoist the dried active part into the tank, seal the cover, and check for airtightness. 5. Accessory Installation: Install bushings, pressure relief devices, oil level gauges and other accessories. 6. Oil Filling and Standing: Fill with insulating oil under vacuum until reaching the standard oil level. |
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | % | Maximun resistance unbalance rate | 2.77 | Pass |
| 2 | Ratio Tests | % | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: YNyn0 | -0.04% ~ 0.08% | Pass |
| 3 | phase-relation tests | / | YNyn0 | YNyn0 | Pass |
| 4 | No-load losses and excitation current | / | I0 :: provide measured value | 0.24% | Pass |
| P0: provide measured value(t:20℃) | 1.599kW | ||||
| 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 | 5.37% | ||||
| Pk: measured value | 15.863kW | ||||
| Pt: measured value | 17.462 kW | ||||
| Efficiency not less than 99.26% | 99.31% | ||||
| 6 | Applied Voltage Test | kV | HV: 10kV 60s 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):40 | |||||
| Frequency (HZ): 150 | |||||
| 8 | Leakage Test | kPa | Applied pressure：50kPA | No leakage and no Damage | Pass |
| Duration：12h | |||||
| 9 | Insulation Resistance Measurement | GΩ | HV-LV to Ground : | 16.3 | / |
| LV-HV to Ground: | 22.5 | ||||
| 10 | Oil Dielectric Test | kV | ≥45 | 57.6 | Pass |
04 Packing and Shipping
4.1 Packing
| 1. Moisture Protection – Install desiccant inside unit before vacuum sealing. 2. Accessories – Load-switch operating rod fixed on wooden support; T-wrench included per unit. 3. Base – Solid wood pallet with steel reinforcement. 4. Leak Check – Place oil-detection paper under transformer. 5. Sealing – Vacuum-seal in foil bag using industrial sealer. 6. Protection – Install corner guards and wrap tightly with film. 7. Markings – Clearly label forklift points and center of gravity. |  |
4.2 Shipping
 | The 1500kVA pad-mounted transformer, along with a 500kVA unit, will be shipped under CIF terms to the port of Kingston. The seller arranges inland transport from the factory to the loading port using heavy-duty trucks with secure fastening, followed by ocean freight via carriers (e.g., MSC or Maersk). If the transformers fit container dimensions, 40’HQ or flat racks will be used; otherwise, breakbulk shipping applies. The sea voyage takes approximately 25-35 days, with the seller covering All Risks insurance for the entire journey. Upon arrival at Kingston, the buyer handles customs clearance and unloading, while the seller provides full shipping documents (e.g., B/L, insurance policy). |
05 Site And Summary
With compact design, high efficiency, and outstanding environmental adaptability, our pad-mounted transformers are the ideal choice for urban power distribution, industrial facilities, and renewable energy projects. Manufactured to strict international standards, they deliver safe, reliable, and low-maintenance performance. we offer customized configurations to meet diverse application needs, choosing our pad-mounted transformers means investing in long-term power stability and expert technical support. For more details, feel free to contact our team today!
