1500 kVA Pad Mount Transformer-13.8/0.46 kV | Guyana 2025

Smart Grid Ready, Eco-Friendly Design – Pad-Mounted Transformers for a Sustainable Tomorrow.

01 General

1.1 Project Description

In 2025, a 1500 kva pad mount transformer was successfully delivered to Guyana. Designed with ONAN cooling, it operates at a primary voltage of 13.8D kV with an NLTC ±2×2.5% tapping range, and a secondary voltage of 0.46Y/0.266 kV, forming a Dyn11 vector group. This project was developed to meet the specific needs of urban distribution networks, commercial parks, and industrial zones, providing efficient medium-to-low voltage power conversion and distribution. Customers in these sectors face several challenges:

 High electricity demand requiring stable, reliable medium-to-low voltage distribution equipment.

 Complex outdoor environments necessitate corrosion-resistant, weatherproof, and high-protection transformers.

 Tight project timelines, with a need for fast delivery and simplified installation.

 Increasing requirements for energy efficiency and environmentally friendly solutions.

Leveraging our customised R&D capabilities, we can adjust transformer parameters according to load requirements and ensure rapid delivery. The units are CSA/UL certified and built with high-protection enclosures and durable materials to guarantee long-term stable outdoor operation. A commercial park client remarked:

“These transformers were easy to install, ran fault-free for half a year, and the manufacturer’s response was prompt.”

This project demonstrates our commitment to delivering reliable, adaptable distribution equipment that powers safe and efficient operations for our clients.

1.2 Technical Specification

1500 kva pad mount transformer specifications type and data sheet

1.3 Drawings

1500 kva pad mount transformer diagram drawing and size.

02 Manufacturing

2.1 Core

The 1500 kva pad mount transformer features a high-efficiency three-phase, three-limb stacked core made of grain-oriented silicon steel laminations, minimizing no-load losses and ensuring balanced magnetic flux. The precision-layered, insulated design reduces vibration and noise while enhancing durability.

2.2 Winding

This 1500 kva pad mount transformer employs an optimized winding design with low-voltage foil coils for enhanced current capacity and high-voltage layer-wound coils for superior dielectric strength. The transformer’s robust coil construction features precision-wound copper/aluminum conductors, vacuum-impregnated for maximum insulation integrity and thermal performance. This compact yet durable coil and transformer configuration ensures efficient power transfer, excellent short-circuit withstand, and long-term reliability in demanding distribution applications.

2.3 Tank

This 1500 kva pad mount transformer features a heavy-duty tank for oil, constructed from corrosion-resistant steel with reinforced welding for superior durability. The tank is hermetically sealed to prevent moisture and contamination, while integrated oil level/pressure gauges enable easy monitoring. Designed for various environments, this robust tank for oil ensures reliable insulation and cooling, with radiators for enhanced thermal performance.

2.4 Final Assembly

1. Winding Installation: Slide the three-phase high-voltage and low-voltage windings onto the three-limb core, ensuring proper alignment of insulation components. 2. Electrical Connections: Connect winding leads to tap changers, bushings, and other components, then secure and insulate the connections. 3. Core-Coil Drying: Place the assembled active part (core and windings) into a drying oven for vacuum drying to remove moisture and enhance insulation. 4. Tank Insertion: Hoist the dried active part into the tank, secure support structures, and ensure proper grounding and mechanical stability. 5. Accessory Installation: Mount bushings, pressure relief devices, oil level gauges and other accessories, sealing all interfaces. 6. Oil Filling & Sealing: Vacuum-fill transformer insulating oil to the specified level, check for leaks, and perform final electrical tests (e.g., ratio, withstand voltage).

03 Testing

Enable Connection: To link massive test power sources (like variable-frequency power supplies or impulse voltage generators) to the various terminals of the transformer.

Simulate Operating Conditions: To create environments a transformer might encounter during real operation or faults, such as high voltage, high current, short circuits, and temperature rise.

Ensure Safety: To guarantee safe insulation distances and reliable grounding for high-voltage and high-current circuits, protecting both personnel and equipment.

Improve Accuracy: To minimize impedance and losses introduced by external connections, ensuring the precision of measurement results.

Enhance Efficiency: Standardized fixtures allow for rapid setup and testing, significantly improving overall test efficiency.

04 Others

4.1 DOE Energy Efficiency

The term “DOE Energy Efficiency” for Pad-Mounted Transformers refers to the mandatory minimum energy efficiency standards established by the U.S. Department of Energy. These standards aim to enhance overall grid efficiency by limiting the no-load and load losses of these critical components in underground distribution systems. To comply, manufacturers must utilize advanced materials such as high-grade silicon steel or amorphous alloys and optimize the design of the core and coil assembly. Consequently, meeting DOE energy efficiency standards serves as a fundamental market access requirement for North America and a key indicator of the transformer’s energy-saving performance and lifecycle cost-effectiveness.

4.2 Bushing Well

A bushing well is a component used in electrical equipment such as transformers and switches-it functions as a hollow-cavity bushing structure designed to house connector assemblies like bushing inserts. Its core purposes are to securely fasten cables and conductors inside the equipment, and to enable reliable connections between external cables and the device by accommodating matching insert components. As a critical interface part in power systems, it plays a vital role in providing safe and stable connections between high-voltage cables and electrical equipment.

05 Site And Summary

Positioning: Hoist and set the transformer onto the pre-cast concrete foundation, ensuring proper alignment and stability.

Connection: Terminate and connect high-voltage and low-voltage cables to the bushings using pre-fabricated cable terminals. Restore all grounding connections.

Sealing: Securely fasten the tank cover following the specified torque sequence and specifications to ensure complete tank integrity.

Oil Filling: Fill the tank with oil to the correct level using the vacuum filling method to eliminate air pockets.

Testing & Handover: Perform required commissioning tests, install protective barriers and warning signs, and complete the safety handover.