Vacuum Pressure Impregnated (VPI) transformers are heavy-duty, dry-type transformers featuring windings impregnated with high-temperature varnish/resin under vacuum and pressure. They provide high dielectric strength, excellent moisture resistance, and superior structural integrity. Ideal for indoor, industrial, and commercial applications, VPI units offer a fire-safe, low-maintenance alternative to oil-filled transformers up to 15 MVA.
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Key Features and Benefits
Insulation System: Windings are treated with polyester varnish and then cured in an oven to create a solid insulation bond.
Robust Performance: High mechanical strength allows them to withstand significant electromagnetic forces.
Environmentally Friendly: No oil means no risk of contamination or major fire hazards.
Design Flexibility: Available in aluminum or copper windings, with voltage ratings up to 34.5 kV, suited for high-rise buildings and data centers.
Low Maintenance: Suitable for dusty or damp environments, especially when enhanced with Vacuum Pressure Encapsulation (VPE).
Common Applications
VPI transformers are frequently used in:
Industrial Plants: Mining, petrochemical, and manufacturing facilities.
Commercial Buildings: Hospitals, schools, and malls requiring low-noise, safe power.
Energy & Infrastructure: Offshore wind farms, metro stations, and substations.
Rectifier Systems: Powering DC loads in industrial settings.
VPI vs. Cast Resin
While both are dry-type, VPI transformers are generally more economical and easier to repair than cast resin units, making them ideal for projects balancing cost and durability.
Common Voltage/Power Specs
Power Ratings: Up to 15 MVA.
Primary Voltage: Up to 34.5 kV.
Pulse Range: 24, 36, and up to 54 pulses for rectifier applications.
Enclosures: Available in NEMA 1, 3R, or 4 for specific environmental protection
We are a leading manufacturer specializing in medium-voltage electrical solutions, with a strong focus on reliability, innovation, and quality. Based in Foshan, Guangdong, we operate across three manufacturing facilities with a total area of 120,000 square meters. We are equipped to deliver a comprehensive range of products up to 35kV, including distribution transformers, switchgear, and compact substations, with a maximum capacity of up to 10,000kVA.
Our dedicated team of 600 employees works tirelessly to ensure excellence in every product we design and produce. We take pride in our internationally recognized credentials, holding certifications from KEMA and UDEM, while our UL certification has successfully passed prototype testing—a testament to our commitment to global standards and performance reliability.
Driven by a mission to deliver safe and efficient power distribution solutions, we continue to invest in technology, process improvement, and customer satisfaction, serving clients worldwide with tailored electrical systems built to last.
Zhongpeng has established a scientific management system and advanced design and Manufacturing systems,enabling precise control over every processing point and ensuring reliable fulfillment of customer requirements.
Through the development of a digital smart factory centered on ERP,MES,CRM and SRM systems,Zhongpeng has achieved integrated management of material flow, capital flow, and information flow,with a focused commitment to digital transformation.
- 1.We have extensive experience in power grid supply.
- 2.We have Fully automatic intelligent digital production line.
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- 1.KEMA Test Report for Oil immersed Transformer and dry type transformer.
- 2.CNAS Test Report for Oil immersed Transformer and dry type transformer.
- 3.UDEM Test Report for dry type transformer.
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We are a professional manufacturer with 15 years of experience in power equipment, specializing in Transformers and Amorphous Alloy Cores, High and Low Voltage Switchgear, Substations.
We take pride in being a qualified and reliable supplier for the State Grid Corporation of China
Q2. Do you accept customized service?
Indeed, we offer professional OEM and ODM services, and welcome custom logo branding on our products. Our experienced technical and quotation teams are fully prepared to deliver customized solutions for transformers and other power equipment, precisely in accordance with your drawings and specifications.
Q3. What is your Minimum Order Quantity (MOQ)?
Our flexible MOQ is just 1 piece.
Q4.How long is your delivery lead time?
The delivery lead time is upon your product requirements and order quantity. Typically, from the date of advance payment receipt to the port of delivery (FOB), within 30 to 60 days.
Kindly provide detailed photos of the quality issues. Our adept technical and quality testing team will conduct an analysis and offer a satisfactory solution within 2 days.
A6. We require a 30% T/T in advance and the balance 70% before shipment. We also accept Western Union and L/C.
Q7. How do you provide technical support if the product malfunctions?
We offer comprehensive after-sales support:
Remote Guidance: Technical assistance via phone, email, or video conferencing.
On-site Service: Engineers can be dispatched to resolve issues at your location if required (additional fees apply).
Spare Parts Support: We guarantee long-term, stable supply of spare parts.
