High Above, Always On – Durable Pole-Mounted Transformers for Uninterrupted Power.
01 General
1.1 Project Description
167 kVA pole mounted distribution transformer was delivered to Canada in 2025. The rated power of the transformer is 167 kVA with ONAN cooling. The primary voltage is 24.94GrdY/14.4 kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.12/0.24 kV, and they formed a vector group of Ii6.
This 167kVA pole-mounted transformer is a robust and reliable solution designed for efficient power distribution in overhead electrical networks. Equipped with essential protective and operational features, it ensures safe and stable performance in diverse environmental conditions. Key components include a pressure relief device to mitigate internal faults by releasing excess pressure, arrester supports for mounting surge arresters to protect against overvoltages, and an Internal Fault Detection (IFD) system for enhanced monitoring and early fault identification.
Additionally, the pole mounted distribution transformer features an off-circuit tap changer, allowing manual adjustment of the voltage ratio to accommodate varying load requirements when de-energized. Compact, durable, and engineered for ease of maintenance, this unit is ideal for utility and industrial applications demanding dependable power distribution.
1.2 Technical Specification
167 kVA pole mounted distribution transformer specifications type and data sheet
| Delivered to | Canada |
| Year | 2025 |
| Type | Pole mounted transformer |
| Standard | CSA C2.2-06 |
| Rated Power | 167 kVA |
| Frequency | 60HZ |
| Phase | 1 |
| Polarity | Additive |
| Cooling Type | ONAN |
| Primary Voltage | 24.94GrdY/14.4 kV |
| Secondary Voltage | 0.12/0.24 kV |
| Winding Material | Aluminum |
| Angular displacement | Ii6 |
| Impedance | 3% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 0.295 kW |
| On Load Loss | 2.255 kW |
| Accessories | Standard Configuration |
1.3 Drawings
167 kVA pole mounted distribution transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The silicon steel strips are continuously wound by precision machinery into a ring or stepped cross-section (e.g., rectangular or near-circular) to form a closed magnetic circuit. After winding, annealing is performed to relieve mechanical stress and optimize magnetic properties. The seamless magnetic path eliminates additional losses caused by magnetic resistance inconsistencies at joints in laminated cores. The closed magnetic circuit minimizes flux leakage, ensuring uniform magnetic flux distribution, with core efficiency exceeding 99%. |  |
2.2 Winding
 | The LV foil + HV wire winding configuration in pole-mounted transformers achieves an optimal balance of high efficiency, reliability, and low maintenance costs. Flat structure increases cooling surface area, enhancing efficiency with oil or air cooling. Multi-layer insulation optimizes electric field distribution, minimizing partial discharge (PD). Foil winding minimizes radial deformation; HV wire winding uses reinforced insulation for overvoltage. Aluminum foil reduces weight, ideal for pole mounting. |
2.3 Tank
| Our products meet C4 corrosion resistance classification. 1- Process Control Enhancement We have strengthened our coating process through optimized surface pretreatment, rigorous cleaning, and chemical treatment protocols to eliminate substrate contamination, while ensuring guaranteed coating thickness specifications. 2- 2-Structural Improvement We have implemented sealed weld seam treatment on all critical joints to prevent moisture penetration into transformer internal components effectively |  |
2.4 Durable Finish
 | The transformers were painted strictly according to specifications. Steel components were mechanically pretreated and thoroughly cleaned of burrs, rust, and contaminants. Patented liquid or powder paints-polyester or polyurethane-were applied uniformly, covering all parts and integrating the tank and enclosure for full protection. The ASA 70 gray finish meets ANSI C57.12.28 and passes a 1500-hour salt spray test, with surfaces dust-free and untouched after painting. |
2.5 Final Assembly
| 1. Winding Assembly Sequentially install HV and LV windings onto the wound core, ensuring precise positioning of insulation components and mechanical fastening. 2. Electrical Connections Connect leads (HV/LV terminals, tap changer) via welding or bolting to complete electrical circuits between windings, then check contact resistance. 3. Core-Coil Drying Oven Drying Process: Place the assembled active part (core + windings) into a drying oven for vacuum hot-air circulation or vapor-phase drying at 105-130°C for 48-72 hours until insulation moisture content ≤0.5%. 4. Tank Installation Quickly transfer the dried active part into the tank to prevent moisture absorption, then secure with clamping bolts. 5. Accessory Installation Install bushings, pressure relief valve, IFD, etc. 6. Vacuum Oil Filling Inject dry insulating oil under vacuum. |  |
03 Pole Mounted Distribution Transformer Parts
04 Testing
05 Packing and Shipping
06 Site And Summary
As a vital component in power distribution networks, the pole mounted distribution transformer offers compact design, easy installation, and reliable performance, making it ideal for urban and rural grids, industrial parks, and residential power supply. Committed to quality and innovation, we strive to deliver safe, efficient, and durable power solutions to customers worldwide. Please contact us for more information or customized service options.
