1000 kVA custom loop feed electrical pad mounted transformer - utility-oriented design for reliable, high-capacity distribution with easy field installation
01 General
1.1 Project Description
Rated at 1000 kVA, 60 Hz, this custom loop feed electrical pad mounted transformer uses ONAN natural oil cooling. The primary is 25 kV with a 150 kV BIL, providing robust insulation coordination for utility distribution networks. The high-voltage side has separable connectors, allowing dead-front operation and easy field installation. On the secondary side, it steps down to 600Y/347 V with 30 kV BIL, designed to integrate seamlessly into utility feeders. Four-hole spade terminals with grounding ensure mechanical strength and reliable current carrying capacity. The Dyn1 vector group reduces triplen harmonics and handles load imbalance effectively-common challenges in public distribution systems. This custom loop feed electrical pad mounted transformer exemplifies Utility-Oriented Design, built for network stability and operational reliability.
1.2 Technical Specification
1000kVA three phase pad mounted transformer specification and data sheet
| Delivered to | Canada |
| Year | 2025 |
| Type | Three phase pad mount transformer |
| Standard | CSA C227. 4:21 |
| Rated Power | 1000KVA |
| Frequency | 60HZ |
| Feed | Loop |
| Front | Dead |
| Phase | three |
| Cooling Type | ONAN |
| Liquid insulant | Mineral oil |
| Primary Voltage | 25 kV |
| Secondary Voltage | 0.6 kV |
| Vector Group | Dyn1 |
| Winding Material | Aluminum |
| Impedance | 5.75% |
| Efficiency | 99.06 % |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 1.85 kW |
| On Load Loss | 12.8 kW |
| Accessories | Standard Configuration |
1.3 Drawings
1000kVA three phase pad mounted transformer drawing and nameplate
02 Utility Distribution Network Design
2.1 Electrical Design
Rated at 1000 kVA, 60 Hz, this 1000 kva custom loop feed electrical pad mounted transformer uses ONAN natural oil cooling. The primary is 25 kV with a 150 kV BIL, providing robust insulation coordination for utility distribution networks. The high-voltage side has separable connectors, allowing dead-front operation and easy field installation.
On the secondary, it steps down to 600Y/347 V with 30 kV BIL, designed to integrate seamlessly into utility feeders. Four-hole spade terminals with grounding ensure mechanical strength and reliable current carrying capacity.
The Dyn1 vector group reduces triplen harmonics and handles load imbalance effectively-common challenges in public distribution systems. This is truly Utility-Oriented Design, built for network stability and operational reliability.
2.2 Operation & Protection
To support utility looped distribution networks, the 1000 kva custom loop feed electrical pad mounted transformer is equipped with a four-position load break switch, allowing sectionalizing and isolation without interrupting service to downstream loads. The off-circuit tap changer (NLTC) provides a ±2 × 2.5% tapping range, enabling voltage regulation to match feeder conditions.
A complete set of utility-grade protection and monitoring accessories is included:
These features ensure safe operation, fault protection, and simplified maintenance throughout the transformer’s service life. As a custom loop feed electrical pad mounted transformer, it supports flexible network operation while meeting modern utility performance standards.
2.3 Efficiency & Loss
Designed in accordance with CSA C802.1, this custom loop feed electrical pad mounted transformer achieves a minimum efficiency of 99.06%. Loss performance is precisely controlled, with a no-load loss of only 1.85 kW and an on-load loss of 12.8 kW at rated capacity, significantly reducing energy consumption during both idle and operating conditions.
The transformer features an impedance of 5.75%, verified at 100% rated load and corrected to 85°C, providing effective fault current limitation and ensuring stable parallel operation within utility distribution networks.
This high-efficiency and low-loss design minimizes long-term operating costs and supports utility asset lifecycle management strategies by delivering reliable performance and reduced total cost of ownership.
03 Testing
04 Packing and transportation
05 Site And Summary
This 1000 kVA three-phase pad-mounted transformer is specifically designed for public utility distribution networks, supporting reliable power delivery to commercial districts, municipal infrastructure, and mixed-load service areas. Its combination of robust electrical design, high efficiency, comprehensive protection, and professional manufacturing quality makes it a dependable solution for modern utility power systems.
