Oil-type transformers (or oil-immersed) are electrical units using mineral oil, silicone fluid, or natural/synthetic esters for insulation and cooling. They are ideal for high-voltage transmission, distribution, and substation applications, offering superior heat dissipation and higher power ratings (up to 30MVA+ or higher) compared to dry-type options
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Key Features and Benefits
Insulation & Cooling: The core and coils are immersed in oil, providing excellent dielectric insulation and transferring heat away from the internal components.
High Efficiency: Superior heat dissipation allows for larger power capacities and better overload performance.
Outdoor Applicability: Typically designed for outdoor use, including pole-mounted or ground-level substation applications.
Longer Life: Proper maintenance of the insulating oil helps prevent oxidation and corrosion, extending the transformer's lifespan.
Key Components
Transformer Oil: Can be mineral oil (most common), silicone fluid, or biodegradable esters.
Core and Windings: Laminated steel core and copper/aluminum windings submerged in oil.
Conservator: A tank holding extra oil that allows for expansion and contraction with temperature changes.
Buchholz Relay: Detects gas buildup from faults, providing safety against internal issues.
Rated Power: Typically 50kVA up to 30MVA (distribution and power transformers).
Voltage Levels: Primary voltage up to 69kV, Secondary voltage 0.4kV / 0.69kV.
Standards: Designed, manufactured, and tested in accordance with IEC 60076, IEEE C57.12.00, or regional standards.
Cooling System: Mineral oil (natural oil, forced air - ONAN/ONAF) or high-temperature ester fluids.
Winding Material: High-conductivity electrolytic copper or aluminum.
Frequency: 50 Hz or 60 Hz.
Temperature Rise: 55°C or 65°C
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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Q1.Are you a trading company or a manufacturer?
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.
Q5.How do you resolve quality issues?
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.
Q6.What are your payment terms?
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.
