From urban to industrial, adaptable to all scenarios – Three-Phase Pad-Mounted Transformer delivers worry-free power supply!
01 General
1.1 Project Description
This 1500 kva pad mounted transformer was delivered to South Africa in 2024, the rated power of the transformer is 1500kVA with ONAN cooling. The primary voltage is 34.5/19.92kV with ±2*2.5% tapping range (OCTC), the secondary voltage is 0.277/0.48kV, they formed a vector group of YNyn0. The 1500 kva pad mounted transformer produced by SCOTECH adopts multiple protection design, strong aging resistance, high corrosion resistance, high temperature cold and heat shock resistance, long equipment life. Strong ability to adapt to the environment, can adapt to large temperature difference changes, maintain stable and effective normal operation. The high voltage side is protected by double fuses, in which the plug-in fuse is a double sensitive fuse (temperature, current), and the backup fuse is a current limiting fuse, which reduces the operating cost. Customized design to meet the needs of flexible use of compact switchgear in various substations. Adopt strict safety measures such as fire, explosion and lightning protection to protect substation equipment and staff. As an important power supply unit in the cable distribution network, the product is a complete set of pre-assembled products that integrates high voltage control, protection, power transformation, and distribution equipment, and is widely used in urban and rural distribution networks.
1.2 Technical Specification
1500 kVA pad mounted transformer specification and data sheet
| Delivered to | South Africa |
| Year | 2024 |
| Model | 1500KVA-34.5GrdY/19.92-0.277GrdY/0.48KV |
| Type | Loop feed, dead front |
| Kind of insulation | Outdoor type, Pad Mounted |
| Standard | ANSI Standard |
| Rated Power | 1500KVA |
| Frequency | 60HZ |
| Phase | 3 |
| Working Temperature | －10℃—＋40℃ |
| Altitude | 1000M~2000M |
| Cooling Type | ONAN |
| Primary Voltage | 34.5GrdY/19.92 KV |
| Secondary Voltage | 0.277/0.48 KV |
| Core Material | Silicon Steel |
| Winding Material | Aluminum |
| Fuse | Bay-O-Net Fuse and Backup Fuse |
| Angular displacement | YNyn0 |
| Impedance | 5.75%(±7.5%) |
| Efficiency | 99.30% |
| Tapping Range | ±2*2.5% |
| Liquid insulant | Mineral Oil |
| No Load Loss | 2.28KW |
| On Load Loss | 13.3KW |
| Tank | Mild Tank |
| Tank Color | Green(Munsell 7GY 3.29/1.5) |
| Accessories | Pressure Relief Valve, Grounding Lugs, Oil Level Indicator, Tap Changer, Nitrogen Filling Valve, Thermometer, vacuum Pressure Gauge |
1.3 Drawings
1500 kVA pad mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| Through its unique structural design, the three-phase five-column iron core transformer can show obvious advantages in reducing loss, increasing capacity, improving load balance and reducing noise. The design of the three-phase five-column core is three core columns in the middle, each of which is a phase, and the cross section of the side yoke and the upper and lower end yoke on both sides is 1/√3 of the core section, which is mainly used to reduce the height of the core and facilitate transportation. Three-phase five-core column type, also known as three-phase three-core column side yoke type, three-phase five-pillar type compared with three-phase three-pillar type, it has two more branch cores at both ends of the core column, called the choke; There is no winding on the side choke. |  |
2.2 Winding
 | Foil winding has lower inductance loss and copper loss. Foil windings have a larger surface area, which helps to dissipate heat more efficiently. Effective heat dissipation can improve the overall performance and life of the transformer. Because the foil is wide and close, the parasitic inductance and capacitance can be significantly reduced, which reduces the high frequency impedance of the winding and improves the high frequency characteristics of the transformer. Because the current is more evenly distributed along the foil, the foil winding produces less noise than the traditional round wire winding. Foil windings generally have higher insulation properties, especially in multi-layer insulation designs, which can effectively reduce the risk of leakage current and electrical breakdown. |
2.3 Tank
| The tank can adopt anti-corrosion design and special spray painting treatment according to the requirements of the operating environment, with “three anti-condensation” function, that is, anti-salt spray, anti-mold function, and can meet the anti-corrosion requirements in high temperature and high humidity environment. |  |
2.4 Final Assembly
03 Testing
1. DC resistance test.
2. Insulation resistance test.
3. Measurement of voltage ratio and vector group.
4. Separate source AC withstand voltage test.
5. Induced AC withstand voltage test.
6. Measurement No-load loss and no load current.
7. Measurement load and impedance.
8. Resistance loss and efficiency.
9. Seal test.
04 Packing and Shipping
05 Site And Summary
The 1500 kVA pad mounted transformer, with its efficient energy transmission capability, excellent safety performance, and strong environmental adaptability, is the ideal choice for modern power systems. Whether for industrial projects, commercial complexes, or public infrastructure, it provides reliable and stable power support to meet diverse needs. Choose the Three Phase Pad Mounted Transformer to make your power system smarter and more efficient, and together, build a green and sustainable energy future.
