3000 kVA Transformer-25/0.6 kV | Canada 2025

Smart Power Distribution Starts with Our Pad-Mounted Transformers!

01 General

1.1 Project Description

3000 kVA three phase pad mounted transformer was delivered to Canada in 2025. The rated power of the transformer is 3000 kVA with ONAN cooling. The primary voltage is 25 kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.6Y/0.347 kV, they formed a vector group of Dyn1.

Pad-mounted transformers are essential components in modern electrical distribution systems, designed for safe, reliable, and efficient power conversion in urban, suburban, and industrial settings. These robust, ground-level units are housed in durable, weatherproof enclosures, protecting critical components while ensuring easy access for maintenance. Ideal for underground power networks, pad-mounted transformers offer a compact footprint, enhanced safety features, and low-noise operation-making them perfect for areas where aesthetics and space are key considerations. With high efficiency, long service life, and compliance with industry standards, they provide utilities and commercial users with a dependable solution for stepping down medium-voltage electricity to usable levels. Whether for residential developments, commercial complexes, or renewable energy integration, pad-mounted transformers deliver performance you can trust.

1.2 Technical Specification

3000 kVA transformer specifications type and data sheet

1.3 Drawings

3000 kVA pad mounted transformer diagram drawing and size.

02 Manufacturing

2.1 Grounding

The grounding terminals on a pad-mounted transformer are fundamental components for establishing a permanent and robust grounding system. Vertically welded directly to the transformer tank wall on both the HV and LV sides, these terminals serve as the primary connection points. A rigid copper bus bar is then used to bridge these two terminals, creating a continuous, low-resistance path that ensures the entire tank and core assembly remain at a safe ground potential. This design effectively bonds all metallic components, providing a reliable path for fault currents and enhancing safety for both equipment and the public.

2.2 LV Neutral Bushing(X0)

The Low-Voltage Neutral Bushing (X0) on a pad-mounted transformer serves as the central grounding point for the secondary electrical system. It is permanently connected to the transformer’s ground bus via a conductor rated with a suitable ampacity, ensuring a low-impedance path for fault currents and providing a stable system neutral. This critical connection establishes a safe reference to earth ground, enabling proper equipment operation and enhancing personnel and public safety.

2.3 Tank

The tank is constructed with high-grade, corrosion-resistant steel to ensure long-term durability in harsh outdoor environments. Featuring a fully sealed design with precision welds, it provides excellent protection against moisture and contaminants. The tank incorporates strategically placed cooling fins and channels to optimize heat dissipation while maintaining structural integrity. Reinforced construction with lifting lugs and forklift pockets facilitates safe transportation and installation. The exterior receives a multi-layer protective coating system for enhanced weather resistance and aesthetic appeal.

2.4 Final Assembly

The final assembly of 3000 kva transformer integrates core-coil assemblies, high-low voltage bushings, and protection devices into a robust, weatherproof enclosure. Precision alignment ensures optimal magnetic circuit performance while maintaining proper electrical clearances. The assembly process includes rigorous testing of all components, vacuum oil filling for superior insulation, and final quality verification. Factory-assembled junction boxes and cable termination compartments provide convenient field connections.

03 Testing

Dielectric loss factor (or power factor) test:

• The dielectric loss factor test is used to evaluate the loss of insulation materials in a transformer under the influence of an electric field, and to determine the degree of deterioration of its insulation performance. This test can provide early warnings regarding the aging, damage, or insufficient performance of the insulation materials.

04 Others

4.1 Four Load Break Switch

The 4-position load switch of a Pad Mounted Transformer is a core control component on its high-voltage side, responsible for switching power access modes and safe power on/off. It has 4 operating states: Position 1 (Source A&B tap off)：Completely cuts off the connection between the high-voltage power supply and the transformer. This is the safe operation position for the load switch during equipment maintenance or troubleshooting. Position 2 (Source A tap on)：Connects to feeder line A (input line A). The transformer draws operating power from the power grid via feeder line A. Position 3 (Source B tap on)：Connects to feeder line B (input line B). The transformer draws power through feeder line B, and this position is usually used as a backup power circuit. Position 4 (Source A&B tap on)：Connects both feeder lines A and B simultaneously, forming a loop power supply configuration.

4.2 Drain Valve

The drain valve on a pad-mounted transformer, typically located at the lowest point of the tank, is a crucial component for maintenance and safety. It enables the controlled draining of insulating oil for purposes such as internal inspection, repair, or final decommissioning. Its design prevents uncontrolled spills and facilitates safe, directed oil flow into containment vessels, ensuring both operational safety and environmental protection.

05 Packing and shipping

06 Site And Summary

Whether for urban distribution network upgrades or industrial park power support, our 3000 kva transformer deliver stable, flexible distribution solutions-backed by features like the 4-position load switch (for versatile power access) and weather-resistant, high-protection enclosures. A regional utility client noted: “These units integrated seamlessly into our loop network; the load switch’s easy operation and 12+ months of fault-free runtime cut our on-site maintenance hours by 20%.”

We stand ready to provide customized configurations and full-life-cycle support, ensuring your power systems run safely and efficiently.