Compact design, eco-friendly, providing reliable solutions for modern power distribution systems.
01 General
1.1 Project Description
100 kVA single phase pad mounted transformer was delivered to Jamaica in 2024. The rated power of the transformer is 100 kVA with ONAN cooling. The primary voltage is 24GrdY/13.8kV with±2*2.5% tapping range (NLTC), the secondary voltage is 0.24/0.12kV, they formed a vector group of Ii0, and it is a loop feed and dead front 100 kva pad mount transformer. The 100 kva pad mount transformer is well designed and the insulation system is optimized to effectively resist the lightning shock. The distribution of magnetic flux is uniform, the additional loss is low, and local overheating is avoided. The electromagnetic force is controlled in a small range, and the vibration and noise are significantly reduced. Uniform temperature distribution ensures good cooling effect; The magnetization characteristics show excellent linearity and high linearity coefficient, which ensures the efficient and stable operation of the equipment. pad mounted transformer is suitable for general load intensive industrial and mining enterprises, ports and residential areas and other places, can make the high voltage power supply extended to the load center, reduce the low-voltage power supply radius, reduce loss. Site construction period is short, less investment.
1.2 Technical Specification
100 kva pad mount transformer specifications type and data sheet
| Delivered to | Jamaica |
| Year | 2024 |
| Type | Pad mounted transformer |
| Standard | IEEE |
| Feed | Loop |
| Front | Dead |
| Rated Power | 100KVA |
| Frequency | 50HZ |
| Phase | 1 |
| Cooling Type | ONAN |
| Polarity | Subtractive |
| Primary Voltage | 24GrdY/13.8 KV |
| Secondary Voltage | 0.24/0.12 KV |
| Winding Material | Copper |
| Angular displacement | Ii0 |
| Impedance | 4% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| Tolerance | ±7.5% |
| No Load Loss | 0.205KW(＋10%) |
| On Load Loss | 0.801KW(＋6%) |
| Accessories | Standard Configuration |
1.3 Drawings
100 kVA pad mount transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The wound iron core is made of silicon steel sheet with high permeability by winding process. During the winding process, an insulating layer is usually added to reduce vortex and core losses. The insulation between layers is emphasized in the manufacturing process to improve the performance of the core. The structure of the wound iron core can effectively concentrate and transmit the magnetic flux, so that it can withstand higher magnetic flux density under the same volume, and improve the power density and performance of the equipment. With high-quality silicon steel sheets and a precise winding process, core losses and additional losses can be significantly reduced, thereby improving the overall efficiency of the equipment. Because the winding process reduces the air gap and poor contact in the core, the wound iron core usually has lower vibration and noise levels, and the winding process makes the core more uniform, reducing the problem of mechanical vibration. The operation comfort of the equipment is improved. The winding structure of the wound iron core reduces eddy current losses because of the shorter eddy path of the core during the winding process. The winding structure usually makes the core design of the transformer more compact and suitable for applications requiring high power density. Compared to laminated cores, wound iron cores typically have a smaller volume and weight, helping to reduce the overall weight of the transformer. |  |
2.2 Winding
 | High-voltage wire winding: High-voltage winding usually uses copper wire with excellent insulation performance, and is coated with insulating paint or wrapped insulation layer to prevent electrical short circuit and ensure safety. Factors such as insulation grade, voltage resistance and thermal management should be considered in design. The number of turns, diameter and winding of the winding will affect the performance and efficiency of the transformer. Low-voltage foil winding: Foil winding is based on copper or aluminum foil tape of different thickness as conductor, with wide strip insulation material as interlayer insulation, narrow strip insulation material as end insulation, in the foil winding machine to complete the winding, forming a coil, and complete the welding of the inner and outer leads of the coil and the outer surface dressing. Because the current of the low-voltage coil is usually large, if the wire is wound in parallel, if the layer winding method is used when the winding will produce a large spiral Angle, when the transformer short-circuit will produce a large mechanical force in the vertical direction of the coil, resulting in damage to the coil. The end of the copper foil is flat, so the axial force of the short circuit is only a fraction of the wire wound structure, and it has a stronger short-circuit resistance. |
2.3 Tank
| For the original traditional sealing structure, especially where oil leakage is easy to occur, start from the material procurement control to ensure that the steel does not rust, bump, scratch, hammer, special processing of the oil tank sealing part, and the overall painting of the box, remove the sharp corner burrs and welding slag generated in the processing of the box, and strengthen the adhesion of the paint. Weld the cut steel plate, and ensure the uniformity and strength of the weld during the welding process. Generally, gas shielded welding (MIG or MAG) or manual arc welding is used. |  |
2.4 Final Assembly
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | / | / | / | Pass |
| 2 | Ratio Tests | / | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: Ii0 | A: -0.05 B: -0.05 | Pass |
| 3 | Polarity tests | / | Subtractive | Subtractive | Pass |
| 4 | No-load losses and excitation current | % kW | I0 : provide measured value P0: provide measured value the tolerance for no load loss is +10% | 0.23 0.187 | Pass |
| 5 | Load losses and impedance voltage | / kW kW | t: 85℃ Z%: measured value Pk: measured value Pt: measured value the tolerance for impedance is ±10% the tolerance for total load loss is +6% | 3.71 0.732 0.919 99.30 | Pass |
| 6 | Applied Voltage Test | / | LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | / | Applied voltage (kV): 2 Ur Duration(s): 40 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass |
| 8 | Insulation Resistance Measurement | GΩ | LV-HV to Ground | 34.4 | / |
| 9 | Leakage Test | / | Applied pressure: 20kPA Duration: 12h | No leakage and no Damage | Pass |
| 10 | Oil Dielectric Test | kV | ≥45 | 56.81 | Pass |
04 Packing and Shipping
05 Site And Summary
The single-phase pad-mounted transformer, with its compact design, exceptional performance, and high adaptability, is the ideal choice for modern power distribution systems. Whether for residential communities, power facilities, or commercial projects, it delivers stable and reliable power supply to meet diverse needs. With its long service life and low maintenance costs, it provides a more efficient and cost-effective power solution, ensuring greater peace of mind and convenience for your electricity needs!
