500 kVA Pad Mounted Electrical Transformer-34.5/0.48 kV | Panama 2024

Smart technology, safety guaranteed—Comprehensive services for your power needs!

01 General

1.1 Operational Challenges In Panama

 Energy Losses: Grid fluctuations waste energy, increasing costs.

 Voltage Instability: Sensitive equipment risks malfunction during voltage swings.

 Maintenance Challenges: Remote locations and harsh climate complicate servicing.

 Operational Downtime: Equipment failure can halt production or disrupt power supply.

1.2 Project Background

A 500 kVA pad mounted electrical transformer was delivered to Panama in 2024. The rated power of the transformer is 500 kVA with ONAN cooling. The primary voltage is 34.5kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.48y/0.277kV, they formed a vector group of Dyn1, and it is a loop feed and dead front transformer.

The 500 kVA pad mounted electrical transformer design is in accordance to ANSI C57.12.28 Standard and consists of a tank with high and low voltage compartments, separated by a metal barrier or other rigid material. The high and the low voltage compartments are one side of the other, located on the sides of the transformer box. From the front, the low voltage chamber is on the right. The compartment includes an access door. That door is a swing type. The door swivels depend on the door configuration, which is accomplished with section 6.1.2 of the ANSI C57.12.25 Standard. The compartment can be accessible from the interior only. The transformer includes an oil level indicator, located on the low-voltage compartment. Also, it includes two oil valves, one for refilling and the other for drainage purposes. In addition, an overpressure valve is installed on the medium voltage compartment. The structure ensures that the device can be suspended, moved, and/or slid on its base without causing any damage to the high and low voltage components. The structure of the transformer allows movement in two directions: parallel and at a 90-degree Angle to its side. The transformer includes a permanent suspension device (hook) to allow the unit to be suspended horizontally by mechanical means. These components must not be damaged. Any part of the device and allows the device to be suspended without causing any fatigue to the material.

1.3 Technical Specification

500 kVA pad mounted electrical transformer specifications type and data sheet

1.4 Drawings

500 kVA pad mounted electrical transformer diagram drawing and size.

02 Solution Highlights

High-Efficiency Design: Low-loss core and optimized windings reduce no-load and load losses; efficiency ~99.7%, exceeding DOE standards. Reliability: Dead-front construction and loop-feed configuration enhance safety and allow sectional maintenance without full shutdown. Voltage Stability: NLTC ±5% maintains secondary voltage; Dyn1 group ensures balance and minimizes harmonics. Ease of Installation & Maintenance: Aluminum windings and standard accessories simplify transport, installation, and on-site operations. Environmental & Long-Term Operation: ONAN cooling reduces noise and maintenance; high efficiency lowers energy use and environmental impact.

03 Manufacturing

3.1 Core

To overcome the challenges of high energy loss and magnetic imbalance in three-phase transformers, our design strategy employs a symmetrical three-column core with integrated yokes. This balanced magnetic circuit ensures flux equilibrium, minimizes remanence, and significantly reduces iron and eddy current losses, resulting in superior energy efficiency and operational stability

3.2 Winding

To address the critical challenges of withstanding high short-circuit currents, minimizing energy loss, and optimizing thermal management, our hybrid winding strategy combines an inner low-voltage foil winding with an outer high-voltage wire winding. This design ensures superior mechanical strength and short-circuit resistance, while simultaneously reducing DC resistance and eddy current losses for higher efficiency. The structure also enables optimized cooling channels, resulting in lower operating temperatures and enhanced overall performance.

3.3 Tank

To meet the challenges of mechanical stress, environmental corrosion, and operational safety in diverse applications, our transformer tank is engineered with a multi-faceted protective strategy. Constructed from high-quality steel with robotic welding, it ensures structural integrity and leak-proof performance, while advanced anti-corrosion coatings provide long-term resistance to harsh environments. Safety and maintenance are enhanced through integrated features including a pressure relief valve, specialized oil valves, and inspection windows, with the design further customizable to specific capacity and voltage requirements.

3.4 Final Assembly

Installation of core components: Fix the transformer body, high voltage and low voltage switchgear in their respective compartments. Internal connection: Connect cables or busbars between the transformer and the switchgear and ensure reliable grounding. Installation of auxiliary equipment: installation of protection devices such as fuses, pressure relief valves, oil level gauges and low-voltage distribution components. Box assembly: All components are fixed in the stainless steel box, increase the waterproof, dustproof, anti-corrosion design, and ensure good ventilation.

04 Testing

05 Packing and Shipping

5.1 Packing

Our pad mounted electrical transformer is securely packaged in a custom-engineered wooden crate, designed for maximum protection during transit and storage. The robust wooden frame is internally reinforced with blocking and bracing to immobilize the unit, while external steel straps provide additional structural integrity. This comprehensive packaging solution ensures your transformer arrives on site in perfect condition, ready for immediate installation.

5.2 Shipping

Designed for secure ocean freight, our pad mounted electrical transformer are packed in weatherproofed wooden crates with reinforced internal bracing to withstand maritime conditions. Each unit features standardized lifting points and clear stacking markings to ensure safe container loading, efficient vessel stowage, and damage-free delivery to global project sites.

06 Site And Summary

In modern power systems, the three phase pad mounted transformer stands out as an ideal solution for various electrical needs, offering exceptional performance and reliable safety. Whether it is for urban infrastructure, commercial buildings, or industrial applications, it can provide stable and efficient power support, helping users enhance operational efficiency. We are committed to delivering high-quality products and outstanding customer service, ensuring that you have the best experience when choosing our three phase pad mounted transformer. Choose our product, and let us work together to create a greener and more sustainable future!