167 kVA Pole-Mounted Transformer - Scotech's Reliable Power Solution for Grid Infrastructure
01 General
1.1 Project Description
This 167 kva pole mounted transformer was delivered to Guyana in 2024. Conscientiously abide by IEEE & ANSI C57.12.00 standards. The polarity is subtractive, and the vector group is Ii0. Offering a single‑phase voltage rating of 120/240V and a capacity of 167 kVA, this transformer ensures efficient power conversion. It employs the ONAN cooling method. The core and coils are cooled by being surrounded by oil. Copper windings for better conductivity
With a ±2.5% tapping range and a total range of 10%, it delivers consistent voltage output through dynamic load management, optimizing performance amid fluctuating demands. The transformer’s no-load loss is 379W and on-load loss is 1360W, reflecting strong energy efficiency. An impedance of 2.4% minimizes voltage drop under load, supporting consistent and reliable power delivery.
Scotech offers custom-designed transformers, engineered to meet international standards such as IEC, ANSI/IEEE, CSA, RUS, and NEMA. Our product accessories include lightning arresters, IFDs (Internal Fault Detection), thermometers and more. Depending on your requirements, we provide both conventional transformers and Completely Self-Protected (CSP) models.
1.2 Technical Specification
167 kva 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 | 167KVA |
| Frequency | 60HZ |
| Polarity | Subtractive |
| Vector group | Ii0 |
| Primary Voltage | 13800V |
| Secondary Voltage | 120/240V |
| Winding Material | COPPER |
| Impedance | 2.4% |
| Cooling Method | ONAN |
| Tap Changer | NLTC |
| Tapping Range | ±2X2.5%(Total range=10%) |
| No Load Loss | 379W |
| On Load Loss | 1360W |
| Accessories | Standard Configuration |
1.3 Drawings
167 kva pole mounted transformer dimensions and weight details
02 Manufacturing
2.1 Core
| Under the same conditions, wound cores significantly reduce no-load losses and no-load current compared to laminated cores. Wound cores offer over 7% lower no-load losses than laminated cores. Widely used in small capacity pole mounted transformer. We conduct a 100% final quality test to ensure dimensional accuracy and verify that the magnetic value limits are met. |  |
2.2 Winding
Our winding masters, with over 10 years of experience, ensure tight coil alignment and precise tension control in each layer, minimizing loose turns and insulation damage. Combined with high-quality copper and a customized insulation system, our coils can withstand the rigors of high loads and long operating cycles.
2.3 Tank
| The transformer tank is a critical part of a power transformer, containing the core, coils, and insulating oil for safe operation. At Scotech, we manufacture custom transformer tanks built to precise specifications: all material sizes must match drawings, with dimensional deviations under 1 mm. Steel plates must meet national standards, with surfaces free of deformation, heavy rust, peeling, or dents. |  |
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
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| 2 | Ratio Tests | / | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: Ii0 | -0.06 | Pass
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| 3 | Polarity tests | / | Subtractive | Subtractive | Pass
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| 4 | No-load losses and excitation current | % kW | I0 :: provide measured value P0: provide measured value the tolerance for no load loss is +10% | 0.29 0.343 | Pass
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| 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% | 2.16 1.178 1.521 99.27 | Pass
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| 6 | Applied Voltage Test | / | HV：34KV 60s LV: 10kV 60s | No collapse of the test voltage occurs | Pass
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| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV): 2 Ur Duration(s): 48 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass
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| 8 | Insulation Resistance Measurement | GΩ | HV-LV to Ground LV-HV to Ground HV&LV to Ground | 54.6 52.7 50.3 | / |
| 9 | Leakage Test | / | Applied pressure：20kPA Duration：12h | No leakage and no Damage | Pass
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| 10 | Oil Dielectric Test | kV | ≥45 | 51.03 | Pass
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04 Packing and Shipping
05 Site and Summary
Scotech delivers robust pole-mounted transformers built to excel in demanding environments. Our units combine proven engineering with premium materials to ensure decades of dependable service for utility grids, rural electrification projects, and industrial applications.
Every transformer reflects our commitment to excellence:
Engineered for harsh conditions – Withstand extreme weather and fluctuating loads
Optimized efficiency – Advanced designs minimize energy losses
Rigorous quality control – From material selection to final testing
Custom configurations – Tailored to meet specific regional requirements
Backed by decades of transformer manufacturing expertise, Scotech solutions power communities while reducing maintenance needs and downtime. Wherever reliable electricity matters, our transformers deliver.
