Reliable, efficient, and high-performance – the 100 kVA light pole transformer delivers stable power for demanding North American distribution networks
01 General
1.1 Project Description
This 2000 kVA pad-mounted transformer meets the latest US standards, including IEEE C57.12.34-2022 and DOE 2016 efficiency requirements. It steps down primary utility voltage from 24 kV to a secondary output of 480GrdY/277 V.
Featuring copper windings and a Dyn1 vector group, its KNAN cooling ensures robust operation. A significant environmental and safety upgrade comes from the use of FR3 fluid – enhancing green building credentials while significantly reducing fire risk, making it ideal for critical infrastructure and dense urban settings.
With loop feed functionality, the transformer integrates easily into ring-type distribution systems, enhancing system reliability and allowing routine maintenance without service interruption. The dead-front design enhances operator safety.
Primarily applied in electric power distribution, this transformer steps down high-voltage input for integration with energy management systems and underground industrial power infrastructure.
1.2 Technical Specification
2000kVA three phase pad mounted transformer specification and data sheet
| Delivered to | USA |
| Year | 2024 |
| Type | Three phase pad mount transformer |
| Standard | IEEE Std C57.12.34-2022 |
| Rated Power | 2000KVA |
| Frequency | 60HZ |
| Feed | Loop |
| Front | Dead |
| Phase | three |
| Cooling Type | KNAN |
| Liquid insulant | FR3 Oil |
| Primary Voltage | 24 Kv |
| Secondary Voltage | 0.48 Kv |
| Vector Group | Dyn1 |
| Winding Material | Copper |
| Impedance | 5.75% |
| Efficiency and Losses Standard | DOE 2016 |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 1.420kW |
| On Load Loss | 15.600kW |
| Accessories | Standard Configuration |
1.3 Drawings
2000kVA three phase pad mounted transformer dimensions and weight details
02 Manufacturing
2.1 Core
| Built with multi-layer silicon steel laminations insulated by varnish or resin, SCOTECH cores effectively suppress eddy currents and reduce circulating losses. This laminated design also minimizes hysteresis loss, especially during repeated magnetization. It ensures higher efficiency and extends the transformer’s service life. |  |
2.2 Winding
 | This 2000 kVA Dyn1 transformer features copper windings with foil structure on the LV side and multi-layer cylindrical winding on the HV side. The design ensures strong short-circuit resistance, low partial discharge, and excellent thermal performance for stable operation under 24 kV utility input. |
2.3 Tank
| Equipped with devices like pressure relief valves, oil level indicators, and vacuum gauges, the tank allows real-time monitoring of internal conditions. These features support fault prevention and improve safety throughout transformer operation. |  |
2.4 Bushing
2.5 Final assembly
 | Scotech ensures all delivered transformers are clearly identified and labeled according to Division 26 “Electrical Identification” standards. During installation, we recommend that all electrical connections and terminals be tightened per UL 486A and UL 486B to ensure long-term reliability. |
03 Testing
Routine Test and Testing Standard
- Resistance Measurements according to IEEE C57.12.90-2021 Clause 5
- Phase-relation Test according to IEEE C57.12.90-2021 Clause 6
- Ratio Tests according to IEEE C57.12.90-2021 Clause 7
- No Load Losses and No Load Current according to IEEE C57.12.90-2021 Clause 8
- Load Losses, Impedance Voltage and Efficiency according to IEEE C57.12.90-2021 Clause 9
- Induced Voltage Withstand Test according to IEEE C57.12.90-2021 Clause 10.5.1
- Applied Voltage Test according to IEEE C57.12.90-2021 Clause 10.6
- Leak Testing with Pressure for Liquid Immersed Transformers — the leaking test at 15 kPa shall be conducted for 12 h without leakage. No permanent deformation.
- Insulation Resistance Measurement
- Oil Dielectric Test
Test Result
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | % | Maximum resistance unbalance rate | 0.356 | Pass |
| 2 | Ratio Tests | % | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: Dyn1 | -0.02% | Pass |
| 3 | phase-relation tests | / | Dyn1 | Dyn1 | Pass |
| 4 | No-load losses and excitation current | % kW | I0 :: provide measured value P0: provide measured value the tolerance for no load loss is +0% | 0.18% 0.985 | Pass |
| 5 | Load losses impedance voltage and efficiency | % kW kW | t:85℃ Z%: measured value Pk: measured value Pt: measured value the tolerance for impedance is ±7.5% the tolerance for total load loss is +0% Efficiency not less than 99.43% | 5.61% 7.740 8.725 99.46% | Pass |
| 6 | Applied Voltage Test | kV | HV: 40kV 60s LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | kV | Applied voltage (KV): 0.960 Duration(s):40 Frequency (HZ): 180 | No collapse of the test voltage occurs | Pass |
| 8 | Leakage Test | kPa | Applied pressure：15kPA Duration：12h | No leakage and no Damage | Pass |
| 9 | Insulation Resistance Measurement | GΩ | HV-LV to Ground: LV-HV to Ground: HV&LV to Ground: | 2.51 2.60 3.88 | / |
| 10 | Oil Dielectric Test | kV | ≥40 | 52.0 | Pass
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04 Packing and Shipping
05 Site And Summary
Scotech’s 2000 kVA pad-mounted transformer is designed to meet the latest US standards, including IEEE C57.12.34-2022 and DOE 2016 efficiency requirements. It steps down 24 kV primary voltage to 480GrdY/277 V secondary output, featuring copper windings and a Dyn1 vector group with KNAN cooling to ensure reliable, stable performance. The use of environmentally friendly FR3 fluid reduces fire risk and supports green building standards, making it ideal for critical infrastructure and urban environments.
The robust steel tank includes pressure relief valves, oil level indicators, and vacuum gauges for real-time monitoring and increased operational safety. Scotech follows strict labeling and installation standards to ensure reliable, high-quality delivery and long-term performance.
As a trusted manufacturer of medium-voltage distribution equipment, Scotech is committed to providing efficient, safe, and environmentally responsible pad-mounted transformers to support modern power grids and industrial applications.
