Empowering progress with single-phase pole-mounted transformers—precision, reliability, and innovation combined.
01 General
1.1 Project Description
This 50kVA single phase pole mounted transformer is exported to Canada in July, 2024. The rated power of the pole mounted transformer is 50 kVA, the primary voltage is 34.5 kV and secondary voltage is 0.48y/0.277 kV. Western developed countries and Southeast Asia, North and South America, a large number of single-phase pole mounted transformers as distribution transformers. In distribution networks with distributed power supply, single-phase transformers have great advantages as distribution transformers. It can reduce the length of low-voltage distribution lines, reduce line losses, improve the quality of power supply, the use of energy-efficient coil core structure design, the transformer is characterized by the use of column mounted suspension installation, small size, small infrastructure investment, reduce the low-voltage power supply radius, can reduce low-voltage line loss more than 60%. The transformer adopts fully sealed structure, strong overload capacity, high reliability in continuous operation, simple maintenance and long service life.
Single-phase pole mounted transformers are suitable for rural power grids, remote areas, scattered villages, agricultural production, lighting and power consumption, and can also be used for energy-saving transformation of column distribution lines in railways and urban power grids.
1.2 Technical Specification
50 kVA single phase pole mounted transformer specifications and data sheet
| Delivered to | Canada |
| Year | 2024 |
| Model | 50KVA-34.5D-0.48y/0.277KV |
| Type | Single phase pole mounted transformer |
| Standard | CSA C2.1-06 |
| Rated Power | 50KVA |
| Frequency | 60HZ |
| Phase | Single |
| Cooling Type | KNAN |
| Primary Voltage | 34.5D KV |
| Secondary Voltage | 0.48y/0.277 KV |
| Winding Material | Aluminum |
| Polarity | Additive |
| Impedance | 2.5% |
| Tolerance | ±7.5% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| Liquid Insulant | FR3 |
| No Load Loss | 0.118KW |
| On Load Loss | 0.777KW |
| Accessories | Standard Configuration |
1.3 Drawings
50 kVA pole mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The core material is made of high-quality cold-rolled grain-oriented silicon steel with mineral oxide insulation, which has high permeability. Under the same magnetic field strength, the magnetic flux can be transmitted more effectively, thereby improving the working efficiency of the transformer. The grain oriented silicon steel sheet can significantly reduce the hysteresis loss through high-quality material treatment and orientation design, so that the transformer can maintain high efficiency under high load conditions. By controlling the cutting and stacking process of the silicon steel sheet, the loss level, no-load current and noise are minimized. |  |
2.2 Winding
 | Foil winding can significantly reduce current and heat losses in the winding by using thin foils instead of traditional round wires. The structure of the foil winding is conducive to better heat dissipation, reduce the temperature rise of the winding, and enhance the long-term stability and reliability of the transformer. Because of the electrical and magnetic properties of foil windings, they perform better in high frequency applications, reducing high frequency losses. Compared with traditional round winding, the structure of foil winding can reduce noise and vibration. |
2.3 Tank
| High-precision laser cutting machine and CNC punching, reducing, folding and other equipment to ensure the accuracy of processing, after cutting the steel plate edge grinding or deburring treatment to ensure the quality of subsequent welding. Welding is done using arc welding (such as MIG welding, TIG welding) or gas shielded welding (GMAW), and the welding process ensures the strength and tightness of the weld. After welding is complete, the weld is visually inspected and non-destructive testing (such as X-ray or ultrasonic testing) is performed to avoid leakage points and ensure that there are no welding defects. Apply anti-corrosion coating to the inside and outside of the tank. Common treatment methods include spraying anti-rust paint or hot dip galvanizing to increase corrosion resistance. |  |
2.4 Final Assembly
03 Testing
1. Ratio on all connections and tap positions
2. Polarity test
3. No-load losses at 100% rated voltage corrected to 85℃
4. Exciting current at 100% rated voltage
5. Load losses and impedance at rated current corrected to 85℃
6. Applied voltage
7. Induced voltage
8. Transformer tank leak-detection test.
| 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 | 0.03 | Pass |
| 3 | Polarity tests | / | Additive | Additive | Pass |
| 4 | No-load losses and excitation current | % kW | I0 :: provide measured value P0: provide measured value the tolerance for no load loss is ±15% | 0.42 0.111 | Pass |
| 5 | Load losses , impedance voltage,total losses and efficiency | / 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 ±8% | 3.01 0.737 0.848 98.90 | Pass |
| 6 | Applied Voltage Test | / | HV: 70KV 60S LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV): 69 Duration(s):48 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass |
| 8 | Insulation Resistance Measurement | GΩ | HV-LV to Ground : LV-HV to Ground: HV&LV to Ground: | 18.0 8.77 8.21 | / |
| 9 | Leakage Test | / | Applied pressure：20kPA Duration：12h | No leakage and no Damage | Pass |
| 10 | Oil Test | kV, mg/kg, %, mg/kg, | Dielectric Strength; Moisture Content; Dissipation Factor; Furan Analysis ; Gas Chromatography Analysis | 56.37 9.7 0.00341 0.03 / | Pass |
04 Packing and Shipping
05 Site And Summary
The single-phase pole-mounted transformer, with its excellent performance, reliable quality, and versatile applicability, is widely used in urban and rural power distribution networks as well as various industrial scenarios. It not only enhances the operational efficiency of power systems but also provides users with a stable and safe electricity experience. We are committed to delivering high-quality products and professional services, working hand in hand with you to build a smarter and more efficient power future!
