VPI Dry type transformer built to CSA specs (220 C insulation ans 150 Rise) and CSA efficiency, overload up to 150%, and meet specs for local mining projects
Varelen dry-type Vacuum Pressure Impregnated (VPI) transformer is widely relied upon for its long, reliable service life in harsh industrial applications.
Engineered according to CSA standards, this transformer was specifically developed for demanding industrial and utility-grade applications requiring high operational reliability, excellent thermal performance, and long-term energy efficiency.
The project demonstrates Varelen’s capability to manufacture large-capacity dry-type transformers tailored for North American electrical systems, including compliance with Canadian safety and insulation requirements.
| Parameter | Specification |
|---|---|
| Transformer Type | VPI Dry Type Transformer |
| Rated Capacity | up to 25MVA |
| High Voltage | 13800V Delta |
| Low Voltage | 600Y/347V |
| Frequency | 60Hz |
| Vector Group | Dyn1 |
| Impedance | 5.7% |
| Cooling Method | AN/AF |
| Insulation Class | H Class @ 220°C |
| Temperature Rise | 150°C |
| Efficiency | 99.41% |
| BIL HV | 110kV |
| BIL LV | 10kV |
| Tap Changer | (5) ±2.5% |
| Standard | CSA Standard |
|
Enclosure |
NEMA 1, NEMA 3R or NEMA 4 |
Vacuum Pressure Impregnated (VPI) transformer is a dry-type transformer where the windings are impregnated with high-temperature insulating resin under vacuum and pressure conditions. This manufacturing process eliminates air voids and significantly improves insulation integrity.
Compared with conventional dry transformers, VPI transformers provide:
With an efficiency rating of 99.41%, the transformer minimizes operational losses and reduces long-term electricity costs. High-efficiency transformers are increasingly important in Canada due to energy conservation initiatives and sustainability targets.
The low-loss design also reduces heat generation, contributing to longer insulation life and lower cooling requirements.
The transformer Class H insulation system rated at 220°C combined with a 150°C temperature rise design.
This configuration offers several operational advantages:
The Class H insulation system is particularly valuable in industrial facilities where continuous heavy loads are common.
Overload up to 150%
The transformer uses a Dyn1 vector group configuration.
This design provides:
The Dyn1 configuration is widely used in North American industrial power distribution applications.
Varelen applies a strict quality-controlled VPI manufacturing process to ensure consistent transformer reliability.
Copper or aluminum windings are precision wound to achieve accurate electrical performance and mechanical stability.
The coils undergo vacuum drying to eliminate moisture before resin impregnation.
Insulating resin penetrates the windings under vacuum and pressure conditions, ensuring complete insulation coverage.
The impregnated coils are cured at controlled temperatures to achieve maximum insulation strength and durability.
Each transformer undergoes comprehensive factory testing, including:
Varelen provides custom-engineered transformer solutions designed for demanding applications worldwide.
Key advantages include:
The company supplies transformers for utility, renewable energy, mining, industrial, and infrastructure projects across North America and other international markets.
Varelen's VPI (Vacuum Pressure Impregnated) Transformers are designed for superior electrical performance and long service life in demanding industrial, commercial, and utility environments. These dry-type transformers combine rugged construction, high dielectric strength, and excellent thermal performance to deliver reliable power in applications where safety, low maintenance, and environmental protection are essential.
