1000 kVA dead-front pad-mounted transformer - safe, efficient, and built for reliable power distribution in any setting
01 General
1.1 Project Description
Delivered to the USA in 2024, this 1000 kVA three-phase pad-mounted transformer complies with IEEE Std C57.12.34-2022 and meets DOE 2016 energy efficiency standards. It operates at 60 Hz with a primary voltage of 24 kV and a secondary voltage of 480GrdY/277 V, featuring a Dyn1 vector group. The transformer utilizes copper windings and KNAN cooling, and is filled with FR3 natural ester oil to enhance fire safety and environmental sustainability. Equipped with loop feed functionality, dead-front access, and a no-load tap changer offering a ±2 × 2.5% voltage regulation range, the unit has a 5.75% impedance, a no-load loss of 1.020 kW, and an on-load loss of 8.170 kW, ensuring efficient and dependable medium-voltage power distribution.
The 1000 kVA dead front transformer reduces the risk of arc flash during operation or maintenance. Its dead front construction includes fully insulated rubber bushings, with terminations made via loadbreak elbows, ensuring enhanced safety and ease of connection.
1000 kVA dead front pad mount transformer serves as a compact and efficient power solution for utility, commercial, and industrial applications. Engineered for durability, it can be installed both indoors and outdoors, providing a reliable and safe energy distribution system across various environments.
1.2 Technical Specification
1000kVA three phase dead front 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 | 1000KVA |
| 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 | 1.020 KW |
| On Load Loss | 8.170 KW |
| Accessories | Standard Configuration |
1.3 Drawings
1000kVA three phase dead front transformer dimensions and weight details
02 Manufacturing
2.1 Core
| SCOTECH cores are manufactured under strict quality control, ensuring precise stacking, uniform lamination pressure, and consistent magnetic alignment. This process effectively reduces air gaps and mechanical strain within the core, improving structural integrity and minimizing the risk of hot spots. |  |
2.2 Winding
 | Built for commercial and industrial use, this 1000 kVA Dyn1 transformer adopts foil-wound LV coils and paper-insulated copper wire HV coils. The optimized structure ensures reliable insulation, low noise, and enhanced durability under 24 kV input and varying load conditions. |
2.3 Tank
| The transformer tank shields internal components from mechanical shocks, vibration, and external force. Its reinforced steel structure ensures that during transport and installation, critical parts remain well protected and securely positioned. |  |
2.4 Final assembly
 | Scotech equips each transformer with internal Bay-O-Net fuses in series with current-limiting fuses, properly sized for optimal protection. We supply MOV elbow-type surge arresters that meet IEEE 386, ensuring safe performance under surge conditions. |
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 Results
| 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
|
04 Packing and Shipping
05 Site And Summary
Scotech’s 1000 kVA dead front transformer is engineered for reliable and efficient medium-voltage power distribution in utility, commercial, and industrial settings. Designed to meet IEEE Std C57.12.34-2022 and DOE 2016 energy standards, this transformer features copper windings, KNAN cooling, and FR3 natural ester oil for enhanced safety and environmental care. Its dead front design with fully insulated bushings and loadbreak elbows significantly reduces arc flash risk during operation and maintenance.
Built with precision-stacked cores and optimized foil-wound LV and paper-insulated HV coils, it ensures durable insulation and low noise under varying loads. The robust steel tank protects vital components from shocks and vibrations throughout transport and installation. Equipped with Bay-O-Net and current-limiting fuses plus IEEE 386-compliant MOV surge arresters, this dead front transformer offers solid protection and dependable performance.
At Scotech, we focus on delivering practical, safe, and durable dead front transformers that fit diverse environments-indoors or outdoors-powering your operations with confidence and peace of mind.
