Exceptional transmission, precise power supply – Single-phase pole-mounted transformer powering a better life.
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 dry type transformer is 50 kVA, the primary voltage is 34.5 kV and secondary voltage is 0.12/0.24 kV. The transformers produced by our company are designed with high efficiency and energy saving rolled iron core structure. The iron core material is made of high quality cold rolled grain oriented silicon steel sheet insulated by mineral oxide. By controlling the cutting and assembling process of silicon steel sheet, the loss level of transformer and no-load current and noise level are minimized. In addition, the transformer’s unique winding technology effectively improves the lightning resistance and short-circuit resistance. It is mainly used in the distribution network of rural areas, agricultural production and civil building power supply and distribution system.
We ensure that each one of our delivered units has undergone rigorous full acceptance testing. We provide one-package service from consulting, quoting, manufacturing, installation, commissioning, training to after sale services, our products are now operating in more than 50 counties in the world. We aim to be your most reliable supplier as well as your best partner in business!
1.2 Technical Specification
50 kVA single phase pole mounted transformer specifications and data sheet
| Delivered to | Canada |
| Year | 2024 |
| Model | 50KVA-34.5-0.12/0.24KV |
| Type | Single phase pole mounted transformer |
| Standard | IEEE C57.12.20 |
| Rated Power | 50KVA |
| Frequency | 60HZ |
| Phase | Single |
| Cooling Type | ONAN |
| Primary Voltage | 34.5 KV |
| Secondary Voltage | 0.12/0.24 KV |
| Winding Material | Aluminum |
| Polarity | Subtractive |
| Impedance | 2.5% |
| Tolerance | ±7.5% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| Liquid insulant | Mineral oil |
| No Load Loss | 0.112KW |
| On Load Loss | 0.5KW |
| Accessories | Standard Configuration |
1.3 Drawings
50 kVA pole mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| Because the coil core is wound along the best magnetic direction of the oriented silicon steel sheet, it fully gives full play to the superior performance of the oriented silicon steel sheet, the magnetic flux direction is completely consistent with the orientation of the silicon steel sheet, the overload capacity is strong, and the magnetic circuit distortion is small, so the no-load loss and no-load current are smaller than the laminated iron core (the laminated iron core will have magnetic circuit distortion because of the laminated joint). |  |
2.2 Winding
 | – Low voltage winding with high quality cable paper wrapped wire, – The high voltage winding is wound with high-quality polyurethane-enamelled aluminium wire – Interlayer insulation uses dotting paper to bond the coil into a fixed unit with excellent insulation resistance – The transformer structure is reliable during normal operation and transportation |
2.3 Tank
| – Japan Mitsubishi laser cutting machine and CNC punching, reducing, folding and other equipment to ensure the accuracy of processing – ABB robot automatic welding, laser detection, avoid leakage, pass rate of 99.99998% – Electrostatic spray treatment, 50 years do not remove paint (coating corrosion resistance within 100h, hardness ≥0.4) – Cylinder type fully sealed construction with self-sealing manual pressure relief valve (ANSI specification) – Standard NEMA hanger brackets (each unit includes pole support rack plates) – Fully sealed structure, maintenance-free, normal operation life of more than 30 years |  |
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.
Test result
| 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 | -0.02 | 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 ±15% | 0.32 0.112 | 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% | 2.60 0.488 0.600 99.12 | 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: | 59.3 57.7 56.4 | / |
| 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 | 50.8 9.6 0.00437 0.03 / | Pass |
04 Packing and Shipping
05 Site And Summary
Thank you for your interest in our single-phase pole-mounted transformer! With its efficiency, stability, and durability, this product provides reliable support for power transmission and serves as a key component in power systems. We always adhere to the principles of quality first and customer priority, continuously innovating to deliver better solutions and services. We look forward to working with you to create a brilliant future together!
