Pad mounted transformer with fully sealed oil tank, high safety, and compact design. Ideal for underground distribution systems, compliant with IEC, IEEE standards, offering reliable and maintenance-free operation.
| Rated voltage | 1kV-34.5kV |
|---|---|
| Rated capacity | 100kVA-3000kVA |
| Application scenarios | Suitable for urban and rural power grid construction and transformation |
| Certifications & Standards | TÜV -issued CE • CB IEC EN ISO 9001• 14001• 45001 |
The pad mounted transformer, also known as a combined transformer, is an integrated power distribution solution designed for underground cable systems and urban electrical networks. It combines high-voltage load switches, plug-in fuses, backup protection fuses, transformer body, and no-load tap changers within a fully sealed oil-filled tank. This compact and enclosed structure ensures high safety, reliability, and minimal maintenance requirements.
The transformer uses insulating oil as both the cooling and insulation medium. The high-voltage system and transformer core are housed inside the sealed tank, while high-voltage connections are made through insulated elbow cable connectors. The low-voltage compartment is separated and equipped with circuit breakers, current transformers, and metering devices for efficient power distribution and monitoring.
All live components are fully enclosed within the tank, eliminating exposure risks and significantly enhancing operational safety in public and industrial environments.
The pad mounted transformer supports multiple high-voltage wiring configurations, including ring network, terminal, and dual-circuit terminal systems. These configurations enable flexible power distribution, improved redundancy, and enhanced grid reliability, making the transformer suitable for both radial and loop network systems.
The ring network structure allows one input and multiple outputs, supporting continuous power supply to adjacent transformers or electrical equipment. The dual-circuit system provides an additional backup power source to ensure uninterrupted operation during primary supply failure.
The high-voltage input is achieved through elbow-type cable connectors, ensuring fully insulated and safe underground cable connections. The system includes lightning arresters for surge protection, as well as monitoring devices such as oil level indicators, temperature gauges, and pressure relief valves for real-time operational safety.
The protection system integrates high-voltage current-limiting fuses and overload protection fuses connected in series, providing comprehensive protection against overloads, short circuits, and internal faults. The low-voltage side is equipped with air circuit breakers to ensure reliable secondary protection.
This dual-layer protection mechanism enhances system safety while reducing operational risks and maintenance costs.
The pad mounted transformer is designed to operate in demanding environments, with an installation altitude of up to 1000 meters and wind resistance equivalent to 34m/s. It performs reliably under high humidity conditions, with daily and monthly relative humidity averages below 95%.
The installation site should be free from corrosive gases, flammable substances, and severe vibrations. The allowable installation inclination should not exceed 3 degrees to ensure optimal performance and long-term stability.
The product is manufactured in accordance with international standards, including IEC 60076 for power transformers, IEC 61330 for prefabricated substations, and IEEE C57 for liquid-immersed transformer safety and performance. These certifications guarantee compliance with global technical and safety requirements.
Each transformer undergoes strict factory testing to ensure consistent quality, reliable performance, and long service life in various power distribution applications.
The transformer adopts advanced core materials with excellent harmonic resistance, low losses, and low noise levels. It offers high overload capacity and low temperature rise, ensuring stable operation under fluctuating load conditions.
The enclosure is made of high-quality cold-rolled steel with strong mechanical strength, including resistance to impact, bending, and tension. The surface is treated with electrostatic powder coating, providing excellent corrosion resistance for outdoor applications.
Its compact structure and small footprint make it easy to install in urban areas, commercial centers, industrial parks, and renewable energy projects. The fully sealed and insulated design ensures maintenance-free operation and enhanced safety for personnel and equipment.
Pad mounted transformers are widely used in residential communities, commercial developments, industrial facilities, renewable energy systems, and underground distribution networks. Their flexibility, safety, and reliability make them a preferred solution for modern power infrastructure.
The product comes with a standard 2-year warranty and comprehensive technical support. Customized configurations are available to meet specific project requirements and environmental conditions.
ZTELEC Yuguang Electric Technology, founded in 2014, builds on state-owned industrial expertise to deliver reliable power solutions worldwide.
Copyright © 2026.ztygelectric All rights reserved.
