A three-phase pad-mounted transformer is a ground-level electrical distribution unit housed in a tamper-resistant, lockable steel cabinet. It is primarily used to step down medium-voltage electricity (typically 15kV to 35kV) to lower levels (such as 120/208V or 277/480V) for commercial, industrial, and residential applications
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Key Features & Design
Tamper-Resistant Enclosure: The locked metal cabinet prevents unauthorized access and protects internal components from weather, making it safe for public areas like sidewalks and parks.
Fluid-Insulated: Most units are oil-filled for cooling and insulation, often using mineral oil or biodegradable ester fluids like FR3 for enhanced fire safety.
Front-Access Compartments: High-voltage (HV) and low-voltage (LV) sections are clearly separated for safety and accessible via front doors for maintenance.
Feed Configurations
Radial Feed: Power arrives from a single source via three HV bushings. It is simpler and more cost-effective but lacks redundancy if the source fails.
Loop Feed: Features six HV bushings to allow power to circulate in a loop. This provides redundancy, allowing for maintenance or repairs without service interruptions.
Common Applications
Commercial & Industrial: Shopping malls, office complexes, factories, and warehouses requiring stable power for large motors and HVAC systems.
Modern Infrastructure: Data centers, EV charging stations, and renewable energy sites like solar or wind farms.
Public Services: Hospitals, schools, and transportation hubs where reliable underground distribution is preferred for aesthetics and safe
Ratings: 45 kVA to 10,000 kVA (standardized sizes).
Primary Voltages: 2,400V to 46,000V (Delta or Wye connected).
Secondary Voltages: 208Y/120V, 480Y/277V, 240/120V, and 416Y/240V.
Insulation Class (BIL): 30–200 kV.
Temperature Rise: 65°C average winding rise (standard), 75°C available for higher capacity (approx. 12% boost).
Cooling Type: ONAN (Oil Natural Air Natural) or KNAN (Less-flammable liquid).
Taps: High voltage taps, commonly ±2×2.5%.
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.
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?
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.
