Your Answer for Rural Electrification: The Single Phase Pole Mounted Transformer.
01 General
1.1 Project Description
167 kVA single phase pole top transformer was delivered to Canada in 2025. The rated power of the transformer is 167 kVA with KNAN cooling. The high voltage is 34.5D kV, the low voltage is 0.347/0.6Y kV, they formed a vector group of Ii6.
pole top transformer engineered to deliver exceptional reliability and efficiency for modern overhead distribution networks. This transformer is designed with utility-grade robustness in mind, featuring a core of high-quality silicon steel and copper windings to ensure low losses, superior conductivity, and long-term operational economy.
The pole top transformer is built to the exacting CSA C2.2 and C802.1 standards, guaranteeing compliance with stringent North American efficiency and safety requirements. It is filled with environmentally friendly FR3® fluid, providing enhanced fire safety, superior insulation, and extended paper life for a reduced total cost of ownership.
Key operational features include a versatile 5-position, 100 Amp tap changer for precise voltage regulation, and a conservative 65°C temperature rise for increased durability. The transformer is furnished with heavy-duty 36kV primary arresters and comes pre-configured with hanger brackets for straightforward installation. This transformer is the ideal, turnkey solution for reliably serving residential, commercial, and rural loads, ensuring power delivery you can count on.
1.2 Technical Specification
125 kVA pole top 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 | KNAN |
| Primary Voltage | 34.5D kV |
| Secondary Voltage | 0.347/0.6Y kV |
| Winding Material | Copper |
| Vector Group | Ii6 |
| Impedance | 2.8% |
| Tap Changer | N/A |
| No Load Loss | 0.27 kW |
| On Load Loss | 2.36 kW |
1.3 Drawings
167 kVA pole top transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| Featuring an innovative wound core construction of high-grade silicon steel, this transformer achieves exceptional magnetic efficiency. The seamless circular design minimizes flux leakage and core losses, while providing inherent mechanical strength. This advanced core technology not only lowers energy consumption but also ensures quiet, reliable operation, making it an environmentally conscious choice for modern power distribution systems. |  |
2.2 Winding
 | It features an advanced winding system where the low-voltage winding is made of copper foil to provide superior dynamic stability and thermal performance, while the high-voltage winding uses layered copper wire for excellent dielectric strength. The all-copper construction ensures minimal losses, high overload capacity, and long-term operational reliability for demanding distribution applications. |
2.3 Tank
| The tank of a single – phase pole top transformer is a cylindrical metal enclosure, usually made of steel with a corrosion – protective coating. It has cooling fins attached to its sides for effective heat dissipation. The top part is sealed, and there are arrangements for lifting and securing, which not only protects the internal components like windings but also helps in dissipating the heat generated during the transformer’s operation. |  |
2.4 Final Assembly
 | The final assembly integrates the core and windings into a sealed tank through a precisely controlled process. This includes vacuum drying to remove moisture, followed by vacuum oil filling to ensure optimal insulation integrity. External components such as bushings, tap changers, and protective devices are then methodically installed and tested, resulting in a robust, ready-for-service unit that meets stringent performance standards. |
03 Testing
Tests for single-phase pole top transformer, conducted to ensure performance, safety, and compliance with standards like IEEE and IEC 60076, typically include core routine and diagnostic assessments: insulation resistance (megger) tests measure insulation integrity between windings and between windings and earth, sometimes with polarization index calculations to check dryness ; turns ratio (TTR) tests verify voltage transformation accuracy and detect winding defects or tap changer malfunctions ; no-load tests (LV energized, HV open) quantify core losses and magnetizing current, while short-circuit tests (HV energized, LV shorted) measure copper losses and short-circuit impedance ; additional tests include polarity checks to confirm correct winding connections , leak tests for fluid-insulated units, and full-wave impulse tests to withstand voltage surges .
| 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: Ii6 | 0.08~0.11 | Pass |
| 3 | Polarity tests | / | Additive | Additive | Pass |
| 4 | No-load losses and excitation current | % | I0 :: provide measured value（100%） | 0.21 | Pass |
| kW | P0: provide measured value（100%） | 0.265 | |||
| % | I0 :: provide measured value（105%） | 0.48 | |||
| kW | P0: provide measured value（105%） | 0.323 | |||
| / | the tolerance for no load loss is +0% | / | |||
| 5 | Load losses , impedance voltage,total losses and efficiency | / | t:85℃ the tolerance for impedance is ±7.5% the tolerance for total load loss is +0% | / | Pass |
| % | Z%: measured value | 2.60 | |||
| kW | Pk: measured value | 2.012 | |||
| kW | Pt: measured value | 2.277 | |||
| % | Efficiency not less than 99.05% | 99.14 | |||
| 6 | Applied Voltage Test | / | LV: 10kV 60s HV：50kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV):0.694 | No collapse of the test voltage occurs | Pass |
| Duration(s):40 | |||||
| Frequency (HZ): 180 | |||||
| 8 | Insulation Resistance Measurement | GΩ | HV-LV·to·Ground | 1.31 | Pass |
| LV-HV to Ground | 1.69 | ||||
| HV&LV to Ground | 2.08 | ||||
| 9 | Leakage Test | / | Applied pressure：20kPA | No leakage and no Damage | Pass |
| Duration：12h | |||||
| 10 | Oil Test | kV | Dielectric Strength | 51.2 | Pass |
| mg/kg | Moisture Content | 179.7 | |||
| % | Dissipation Factor | 2.238 | |||
| mg/kg | Furan Analysis | / | |||
| / | Gas Chromatography Analysis | / |
04 Packing and Shipping
4.1 Packing
| The single – phase pole – mounted transformer is usually packaged by first wrapping the transformer body with plastic film to protect it from moisture and dust. Then, it is placed into a robust wooden crate, which offers mechanical protection during transit. The wooden crate is also marked with handling symbols and instructions to ensure proper lifting and storage, thus keeping the transformer intact during transportation from the factory to the installation location. |  |
4.2 Shipping
 | The transformer is supplied under CIF (Cost, Insurance, and Freight) terms to the port of Montreal. The price includes all costs for marine transportation and insurance coverage up to the destination port. All necessary shipping documents – including bill of lading, insurance certificate, and commercial invoice – will be provided to facilitate smooth customs clearance at Montreal. |
05 Site And Summary
In summary, our single-phase pole-mounted transformer delivers exceptional value through its optimized design and robust construction. By integrating high-efficiency core technology, reliable winding systems, and durable tank protection, it ensures long-term performance with reduced lifecycle costs. This transformer represents a smart investment for utilities seeking to enhance grid reliability while maintaining operational economy, making it the ideal choice for modern distribution networks.
