2500 KVA Ground Mount Transformer-12.47/0.6 KV | USA 2025

Delivering Energy, Preserving Value: Advanced Pad Mounted Transformers.

01 General

1.1 Project Description

2500 kVA ground mount transformer was delivered to USA in 2025. The rated power of the transformer is 2500 kVA with KNAN cooling. The high voltage is 12.47GRDY/7.2 kV with ±2*2.5% tapping range (NLTC), the low voltage is 0.6Y/0.346 kV, they formed a vector group of YNyn0.

The transformer adopts a three-phase three-limb core structure, which ensures stable magnetic circuit performance, effectively reduces iron loss, and enhances operational reliability. It is filled with FR3 oil as the insulation and cooling medium, a high-quality environmentally friendly insulation oil that boasts excellent thermal stability, fire resistance and biodegradability, providing comprehensive protection for the internal components of the transformer while complying with environmental protection requirements.

In terms of energy efficiency, the product strictly complies with DOE efficiency standards, optimizing the design of core and winding to minimize no-load loss and load loss, realizing energy saving and consumption reduction during long-term operation, and bringing considerable economic benefits to users. To ensure safe operation, the transformer is equipped with isolation screen grounding sleeves, which are specially used for the grounding shield system. This configuration can effectively suppress electromagnetic interference, reduce partial discharge, and protect the transformer from potential electrical hazards, ensuring the safety of the equipment and the power grid.

Externally, the transformer features a powder coated white finish (RAL 9003), which not only offers excellent corrosion resistance and weather resistance to adapt to various harsh outdoor environments, but also presents a clean and neat appearance, blending well with different installation scenarios. Overall, this pad mounted transformer combines environmental protection, high efficiency, safety and durability, making it an ideal choice for urban and rural power distribution projects.

1.2 Technical Specification

2500 kVA ground mount transformer specifications type and data sheet

1.3 Drawings

2500 kVA pad mounted transformer diagram drawing and size.

02 Manufacturing

2.1 H0 Bushing

The H0 bushing on a ground mount transformer is a fully-shielded, submersible-rated interface for connecting underground high-voltage cables (typically 15/25 kV). Its compact, one-piece elastomeric design provides a completely safe, non-exposed connection by integrating a grounded outer conductive shield. Key features often include a test point and provisions for plug-in accessories like fault indicators or arresters, making it a robust, maintenance-free component for underground distribution systems.

2.2 Two Position Loadbreak Switch

The two-position load break switch on a ground mount transformer is a critical control component for underground distribution systems, featuring only two operational states: “Closed” to energize the circuit and “Open” to de-energize it, with no intermediate positions. Engineered to safely make and break load currents under normal operating conditions, multiple such switches are often deployed in tandem to enable flexible control of distinct circuit paths (e.g., A and B feeder lines), supporting reliable power distribution from the transformer to the grid.

2.3 LV Bushing Support

The two-position load break switch on a ground mount transformer is a critical control component for underground distribution systems, featuring only two operational states: “Closed” to energize the circuit and “Open” to de-energize it, with no intermediate positions. Engineered to safely make and break load currents under normal operating conditions, multiple such switches are often deployed in tandem to enable flexible control of distinct circuit paths (e.g., A and B feeder lines), supporting reliable power distribution from the transformer to the grid.

2.4 Grounding Shield

The grounding shield in a ground mount transformer is a critical conductive layer, typically connected to earth potential, that surrounds the live internal components. Its primary function is to ensure safety by containing and safely diverting fault currents to the ground, preventing the transformer enclosure from becoming energized and protecting personnel. Simultaneously, it provides essential electromagnetic shielding, which minimizes interference from the external environment and reduces stress on the transformer’s insulation, thereby enhancing operational reliability and longevity. This integral feature supports modern grid demands for resilience and compatibility with condition monitoring systems in evolving power networks.

2.5 HV Bushing

The HV (high-voltage) bushing of a pad-mounted transformer is a critical insulated connection component, typically available in voltage ratings of 15KV, 25KV, and 35KV (e.g., LBI200 series) and compliant with IEEE 386 standards. It serves as the interface between the transformer’s internal primary windings and external distribution cables, featuring a sealed, plug-in design with insulation materials like epoxy or glass-reinforced nylon resin to ensure superior electrical insulation and mechanical stability. This bushing prevents transformer oil leakage and moisture/dust intrusion while minimizing arc flash risks during maintenance, supporting safe load-break operations and field-replaceable functionality for reliable outdoor power distribution.

03 Testing

Insulation Resistance Measurement is a fundamental diagnostic test for pad-mounted transformers, conducted to assess the integrity and quality of the insulation system between windings and between windings and ground. Typically performed using a megohmmeter (Megger), the test applies a high DC voltage to measure the resistance of the insulation. A high, stable reading indicates strong dielectric strength and healthy, dry insulation, while a low or declining resistance value can signal potential issues such as moisture ingress, contamination, insulation aging, or physical damage. This routine test is vital for predictive maintenance, helping to prevent failures, ensure personnel safety, and extend the operational life of the transformer within the distribution network.

04 Site And Summary

Choosing our pad-mounted transformers means investing not just in electrical equipment, but in long-term safety, exceptional value, and unwavering reliability for your power distribution network. With their rugged construction, advanced grounding and insulation technologies, and built-in readiness for smart grid integration, our products ensure dependable performance in the most demanding environments while optimizing total cost of ownership. Let our proven engineering expertise and commitment to quality make us your trusted partner in building a safer, more efficient, and resilient grid. Contact us today to find the perfect power solution for your project.