SCOTECH Single Phase Pole Mounted Transformers: Reliable Power from 10kVA to 500kVA for Every Grid Need
01 General
1.1 Project Description
The order from our customer in Guyana 2024, an electrical engineering services company, includes transformers with capacities of 25kVA, 50kVA, 75kVA, 100kVA, and 167kVA. 50kVA Ideal for medium-sized residential areas or small businesses.
The transformer thoroughly conforms to IEEE & ANSI C57.12.00 standards. Operates at a primary voltage of 13,800V, stepping down to 120/240V on the secondary side, with a frequency of 60Hz and copper windings. The impedance is 2%, minimising voltage drop under load.
Equipped with an ONAN cooling system and an NLTC (No Load Tap Changer), it offers a 10% tapping range (±2.5% per tap), stabilising secondary voltage even with primary fluctuations. The no-load loss is 160W, and the on-load loss is 512W, optimising energy use. The transformer features subtractive polarity and a vector group of Ii0, defining its phase relationship.
As a leading manufacturer of transformers, we offer the perfect transformer solutions for your electrical distribution needs.
1.2 Technical Specification
50kVA Single phase pole mounted transformer specification and data sheet
| Delivered to | Guyana |
| Year | 2024 |
| Type | Single phase pole mounted transformer |
| Standard | IEEE & ANSI C57.12.00 |
| Rated Power | 50KVA |
| Frequency | 60HZ |
| Polarity | Subtractive |
| Vector group | Ii0 |
| Primary Voltage | 13800V |
| Secondary Voltage | 120/240V |
| Winding Material | COPPER |
| Impedance | 2% |
| Cooling Method | ONAN |
| Tap Changer | NLTC |
| Tapping Range | ±2X2.5%(Total range=10%) |
| No Load Loss | 160W |
| On Load Loss | 512W |
| Accessories | Standard Configuration |
1.3 Drawings
50kVA Single phase pole mounted transformer dimensions and weight details
02 Manufacturing
2.1 Core
| The structural advantage of the wound core is that it allows the ferromagnetic material to fully utilize its superior electromagnetic properties, reducing the core loss coefficient. The core leg and yoke cross-section of the single-phase wound core are both rectangular and continuously wound with magnetic steel strip, significantly reducing no-load loss, no-load current, and transformer noise. |  |
2.2 Winding
 | Our transformer windings use high-purity enameled round copper wire, featuring excellent electrical conductivity and compact insulation. The enamel coating provides uniform insulation and reliable dielectric strength. Adopt an optimized coil structure of foil winding for low-voltage coils and wire winding for high-voltage coils, ensuring excellent operational stability, reliability, and thermal performance. |
2.3 Tank
| Mild steel tank with welded lifting lugs and hanger brackets for direct-to-pole mounting. KVA rating on tank wall. Protective coatings are applied to tanks to reduce corrosion. To ensure the safe operation of these electrical transformers despite exposure to harsh climate conditions and their remote locations, reliability is built into their specifications. |  |
2.4 Final Assembly
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03 Testing
Routine Test
- Resistance Measurements
- Ratio Tests
- Polarity Test
- No Load Losses and No Load Current
- Load Losses and Impedance Voltage
- Applied Voltage Test
- Induced Voltage Withstand Test
- Insulation Resistance Measurement
- Leak Testing with Pressure for Liquid Immersed Transformers
- Oil Dielectric Test
Test Results
| 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 | -0.04 | 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 +10% | 0.95 0.130
| 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 +6% | 2.08 0.518 0.648 99.02 | Pass
|
| 6 | Applied Voltage Test | / | HV：34KV 60s LV: 10kV 60s | No collapse of the test voltage occurs | Pass
|
| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV): 2 Ur 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 | 83.6 76.9 75.3 | / |
| 9 | Leakage Test | / | Applied pressure：20kPA Duration：12h | No leakage and no Damage | Pass
|
| 10 | Oil Dielectric Test | kV | ≥45 | 51.41 | Pass
|
04 Packing and Shipping
05 Site and Summary
Our 50kVA single-phase pole-mounted transformer for Guyana ensures efficient, stable, and safe power distribution.
Engineered with high-quality copper windings, low-loss wound core, and a durable outdoor-ready tank, it delivers long-term reliability even in demanding environments.
