Exceptional performance, ultimate reliability—power transformers that make energy more valuable!
01 General
1.1 Project Description
This 25 kVA pole mounted three phase transformer was delivered to France in 2024 via a France trade company, the rated power of the transformer is 25 kVA, the primary voltage and secondary voltage of the transformer 5.5/0.4kV, the transformer is equipped with a no load tap changer, the tapping range is ±2*2.5% at primary side, the cooling is ONAN. Through the research and application of new materials and new processes and the combination of independent innovation and technology introduction, SCOTECH achieves the purpose of reducing no-load loss and noise of transformers through the optimization and innovative design of core and coil structure. This product is suitable for three-phase, 50HZ, 35kV and below power systems, and is the main transformer of small and medium-sized substations. For industrial and agricultural power distribution, power and lighting. The company absorbs domestic and foreign technology, adopts new materials, optimizes design, uses products more reasonably, and the electrical strength, mechanical strength and heat dissipation capacity of products have been significantly improved.
1.2 Technical Specification
25 kVA pole mounted three phase transformer specifications type and data sheet
| Delivered to | South America |
| Year | 2024 |
| Type | Oil immersed transformer |
| Standard | IEC 60076 |
| Rated Power | 25KVA |
| Frequency | 50HZ |
| Phase | 3 |
| Cooling Type | ONAN |
| Primary Voltage | 5.5 KV |
| Secondary Voltage | 0.4 KV |
| Winding Material | copper |
| Angular displacement | Yzn11 |
| Impedance | 4% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 0.155KW |
| On Load Loss | 1.5KW |
| Accessories | Standard Configuration |
1.3 Drawings
25 kVA pole mounted three phase transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The design of the three-phase three-column core adopts the high-quality cold-rolled grain-oriented silicon steel sheet with full oblique joint superposition, which can effectively reduce the hysteresis loss and eddy current loss. The three-phase three-column core provides a more uniform flux distribution and reduces the risk of magnetic saturation. This uniformity helps to improve the efficiency and performance of the equipment, especially when the load changes to maintain good operational stability. The three-phase three-column design makes the core relatively small and effectively saves space. This compact structure is suitable for many applications with strict space requirements. |  |
2.2 Winding
 | The winding adopts elliptical structure, the high and low pressure are layer coil, the axial ampere-turn magnetic circuit of the coil is evenly distributed, which can reduce the mechanical force of the coil short circuit and improve the anti-short circuit ability. The layer coil can optimize the distribution of magnetic flux while reducing the inductance loss, thus improving the overall working efficiency of the equipment. This design helps to reduce energy loss due to changes in current. The layer coil structure allows more effective heat dissipation, which can effectively reduce the temperature rise of the coil during operation, avoid the impact of overheating on the performance of the coil and equipment, and extend the service life of the equipment. Layer coil through multiple layers of insulation design, can effectively improve the arc resistance, reduce the risk of arc in the case of short circuit or overload, improve safety. The design of the layer coil helps to reduce interference in the electromagnetic environment, especially in high-frequency applications, which can reduce the impact of electromagnetic radiation on the surrounding equipment and improve the reliability of the equipment. The layer coil can be designed to achieve a smaller volume of high inductance, which is suitable for electrical equipment requiring compact space to meet the needs of modern miniaturization. The design of the layer coil can be adjusted according to the need of the number of layers and coil parameters, can flexibly adapt to the needs of different electrical equipment, improving the flexibility of the design. |
2.3 Tank
| After oil removal, rust removal, and phosphating treatment, the surface of the tank is sprayed with primer and paint-free, which can meet the special requirements of metallurgy, petrochemical systems and wet and dirty areas. The oil immersed transformer tank can effectively conduct the heat inside the transformer through the oil to the tank wall, and then distribute to the surrounding environment. This design can effectively reduce the working temperature of the transformer and improve its operating efficiency and life. |  |
2.4 Final Assembly
03 Testing
1. Check of Voltage Ratio and Vector Group
2. Measurement of Winding Resistance
3. Separate-Source Power-Frequency Voltage Withstand Test
4. Induced Voltage Withstand Test
5. Measurement of No-load Losses and No-load Current
6. Measurement of Impedance Voltage and Load losses
04 Packing and Shipping
05 Site And Summary
Thank you for your interest in our pole mounted three phase transformer products. Our transformers are renowned for their excellent performance, reliable quality, and innovative technology, capable of meeting the needs of various applications. We are committed to providing superior service and support to ensure you get the most out of your investment. If you have any questions or need more information, please feel free to contact our professional team. We look forward to working with you and helping your projects succeed.
