Dry VPI Distribution Substation

Durable. Reliable. Engineered for Excellence.

MGM Transformers’ Dry Substation (VPI) transformers are built to meet the demands of modern applications where performance, longevity, and environmental safety are non- negotiable. Designed with precision and manufactured using cutting-edge technology, our VPI transformers offer a seamless blend of innovation and reliability.

Key Features:

Voltage ratings: 600 V to 34.5kV
Power Ratings: 500kVA to 10,000kVA
Custom high voltage/low voltage switchgear interface designs
Non-standard substation solutions for unique challenges
Low partial discharge levels for extended life
White label options available

Industrial dry substation with ventilated enclosure containing transformer components and electrical equipment

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Overview

Coils are Vacuum Pressure Impregnated (VPI) with solventless polyester resin.
The finished coils are highly durable, readily dissipate heat, and are protected against dirt, moisture, and industrial contaminants.
Units can be close-coupled to a multitude of High Voltage and Low Voltage Switchgear when specified.

Standard Specifications

DOE 2016 Efficiency Compliant.
UL/CUL/CE/CSA listings.
Supports 50/60/400 Hz frequencies.
150°, 115° or 80 °C Temperature Rise.
220 °C Insulation.
Seismically Certified per ASCE/SEI 7-05 and OSHPD OSP Pre Approval.
Compliant with the IEEE C57.12.01 standard.

Construction & Enclosure

Utilizes Aluminum or Copper Windings.
The core is built with mitered construction from non-aging, high-grade, grain-oriented silicon steel laminations.
The standard enclosure is NEMA 1, Category C construction painted ANSI 61 (light gray).
Enclosures feature high and low voltage ANSI ground pads and include provisions for lifting, jacking, and rolling.

Testing, Options & Accessories

Undergoes standard production tests in accordance with IEEE C57.12.91, including resistance, polarity, turns ratio, and impedance testing.
Units rated 750 kVA and higher can feature thermostatically controlled fans to increase capacity by 33%.
Optional NEMA 3R outdoor enclosures are available.
Optional custom transformer designs at -3dB below IEEE sound level standards.
Special applications support K-factor ratings, low loss designs, rectifier designs, and liquid filled transformer replacement.

Industry Use Cases

Commercial High-Rise Buildings
Enterprise Data Centers
Food & Beverage Manufacturing
Healthcare Facilities & Hospitals

Product Literature

INSTRUCTION SHEETS & MANUALS

TECHNICAL SPECIFICATIONS

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1. What Is a Dry Substation VPI Transformer?

A Dry Substation VPI Transformer (Vacuum Pressure Impregnation) is a dry-type electrical transformer specifically designed for substation use. Instead of liquid insulation, its coils are vacuum-impregnated with resin, making it safer, more fire-resistant, and ideal for indoor or environmentally sensitive installations.

2. What Are The Advantages of a VPI Dry Substation Transformer?

Dry VPI transformers offer superior safety, low maintenance, excellent heat dissipation, and minimal fire risk. They are ideal for facilities with strict environmental standards and areas where liquid-filled transformers are not permitted.

3. How Does Vacuum Pressure Impregnation Improve Transformer Performance?

The VPI process ensures the insulating resin fully penetrates all windings, resulting in exceptional dielectric strength, enhanced moisture resistance, and longer service life — especially under high load or harsh conditions.

4. Where Are Dry Substation Transformers Typically Used?

Dry substation transformers are widely used in commercial buildings, industrial complexes, hospitals, data centers, airports, and indoor electrical substations where safety, reliability, and reduced maintenance are priorities.

5. Are Dry VPI Transformers Environmentally Friendly?

Yes. Since they do not use oil or liquid coolant, dry substation transformers eliminate the risk of soil and groundwater contamination, making them a greener alternative to oil-filled transformers.

6. Can Dry Substation VPI Transformers Operate in Extreme Environments?

Yes. These transformers are engineered to withstand wide temperature ranges and harsh operational conditions while maintaining reliable performance without the need for liquid cooling systems.

7. What Maintenance is needed for a Dry VPI Transformer?

Maintenance is minimal compared to oil transformers. Routine checks typically include visual inspections, thermal imaging, and ensuring proper ventilation. No oil changes or leak checks are required.

8. What Sizes and Voltage Ratings are Available?

Dry substation VPI transformers come in a range of power ratings and voltage configurations to match industrial, utility, and commercial needs. MGM Transformers can be customized based on specific system requirements.