Professional and Reliable, Efficient Power Supply- Three-phase pole-mounted transformer, ensuring stable energy for every kilowatt-hour.
01 General
1.1 Project Description
The 75 kVA 3 phase pole transformer was delivered to Guyana in 2024. The rated power of the transformer is 75 kVA. The primary voltage of the transformer is 13.8 kV and the secondary voltage is 0.22 kV. The connection group is Dyn1, and the cooling is ONAN. Three phase pole mounted transformers produced by SCOTECH have a reasonable insulation structure and strong lightning impact resistance. Uniform flux distribution, low additional loss, no local overheating phenomenon. Low electromagnetic force, low vibration and noise. The temperature distribution is uniform and the cooling effect is good. The magnetization characteristic has high linearity and a high linearity coefficient.
Our 75 kVA 3 phase pole transformer was designed with advanced technology and adopts high quality material and components which result in reliable quality and long operation time. We guarantee that every transformer we deliver has passed comprehensive acceptance testing to ensure top performance and reliability. From initial consultation and quotation to manufacturing, installation, commissioning, training, and after-sales support, we offer a complete turnkey solution. Our transformers are currently in stable operation across more than 50 countries worldwide. Committed to quality and service, we strive to be your trusted transformer supplier and long-term business partner.
1.2 Technical Specification
75 kVA 3 phase pole transformer specification and data sheet
| Delivered to | Guyana |
| Year | 2024 |
| Type | Three Phase Pole Mounted Transformer |
| Standard | IEEE C57.12.00-2021 |
| Rated Power | 75KVA |
| Frequency | 60HZ |
| Phase | 3 |
| Color | ANSI Grey70# |
| Cooling Type | ONAN |
| Primary Voltage | 13.8 KV |
| Secondary Voltage | 0.22/0.127 KV |
| Winding Material | Aluminum |
| Impedance | 2% |
| Tolerance | ±7.5% |
| Efficiency | ≥98.63% |
| Tapping Range | ±2*2.5%@primary side |
| Core Material | Grain oriented silicon steel sheet |
| Liquid insulant | PCB free Transformer Mineral Oil |
| No Load Loss | ≤0.32KW |
| On Load Loss | ≤0.98KW |
| Accessories | Standard Configuration |
1.3 Drawings
75 kVA 3 phase pole transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The core is made of high-quality cold-rolled silicon steel sheet, domestic excellent transverse shear line, shear burr <0.02, full oblique joint, no punching, no stacking iron wheel process; The double H adhesive makes the three columns of the core become a tight, flat and compact whole, effectively reducing the no-load loss, no-load current and noise of the transformer. |  |
2.2 Winding
 | The transformer coil adopts high-purity aluminum wire, which effectively reduces the loss, the pad and stay are rounded, the electric field is uniform, and the reliability is increased. The inner winding support is strengthened to improve its stability and prevent instability and deformation. Foil winding consists of parallel foil sheets, usually made of copper or aluminum. These foils are spaced apart and interleaved to form the structure of the winding. This design makes the foil winding can better heat dissipation when subjected to high current, but also reduces the resistance and inductance of the winding, and improves the electrical performance of the winding. The biggest feature of foil winding is that it is rolled on a special winding machine, which has a high degree of automation and provides high productivity and product quality. The turn, that is, the interlayer and longitudinal capacitance is large, the spiral Angle is eliminated, the short-circuit impact resistance is relatively strong, the mechanical strength is high, the construction is convenient, the axial and radial errors are small, the geometric size is easy to ensure, the turn is relatively tight, not easy to have bubbles, and the surface is smooth. The foil winding can also reduce the partial discharge and improve the insulation performance of the winding. |
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. |  |
2.4 Final Assembly
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values
| Conclusion
|
| 1 | Resistance Measurements | % | Maximum resistance unbalance rate≤4% | 0.43 | Pass |
| 2 | Ratio Tests | % | The deviation of voltage ratio on the principal tapping: ≤0.5% | -0.08~-0.01 | Pass |
| 3 | Phase-Relation Tests | / | Dyn1 | Dyn1 | Pass |
| 4 | No-Load Losses and Excitation Current | % kW | I0 :: provide measured value P0: provide measured value the tolerance for no load loss is +0% | 1.21 0.266 | Pass |
| 5 | Load Losses Impedance Voltage and Efficiency | % kW kW | t:85℃ Z%: measured value Pk: measured value Pt: measured value the tolerance for impedance is ±7.5% the tolerance for total load loss is +0% Efficiency not less than 98.74% | 2.17 0.832 1.098 98.80 | Pass |
| 6 | Applied Voltage Test | kV | HV/: 34kV 60s LV/: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | kV | Applied voltage (KV): 2 Ur Duration(s):48 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass |
| 8 | Leakage Test | kPa | Applied pressure：20kPA Duration：12h | No leakage and no Damage | Pass |
| 9 | Insulation Resistance Measurement | GΩ | HV-LV to Ground : LV-HV to Ground: HV&LV to Ground | 53.4 50.6 48.8 | / |
| 10 | Oil Dielectric Test | kV | ≥45 | 52.83 | Pass |
04 Packing and Shipping
05 Site And Summary
Thank you for taking the time to learn about our 3 phase pole transformer! In modern power systems, our product is not just an efficient power supply device but also a solid cornerstone for ensuring stable power operation. We are committed to providing tailored solutions for our customers, integrating reliable technology with environmentally friendly concepts to enable efficient energy transmission. Choosing us means choosing reliable power assurance for the future. We look forward to working with you to build a smarter and more sustainable energy era together!
