GE Transformer’s 1000 kVA pad-mounted transformers are designed for reliable, efficient, and safe power distribution in utility, industrial, and commercial applications. These three-phase pad-mounted transformers are engineered for outdoor ground-level installation and deliver consistent performance across a wide range of applications, from residential developments to large-scale manufacturing and infrastructure projects.

Each transformer complies with IEC, ANSI, IEEE, and U.S. Department of Energy (DOE) energy efficiency standards, offering flexible primary voltage options ranging from 2.4 kV to 34.5 kV, as well as secondary voltage configurations such as 208Y/120V or 480Y/277V. These transformers support both ring and radial power distribution configurations and are available in single-voltage and dual-voltage designs to accommodate diverse grid requirements.

Key features include: ONAN/ONAF and KNAN/KNAF cooling systems, high-quality silicon steel cores to minimize losses, and oil-immersed insulation for enhanced durability. Integrated components such as load break switches, tap changers, pressure relief devices, oil level indicators, and thermometers facilitate monitoring and maintenance. A fully sealed, corrosion-resistant enclosure ensures long-term, stable operation in harsh environments.

By choosing our underground distribution transformers, you will benefit from reliable performance, customizable configurations, and proven reliability in modern power systems.

Loop feed：

Loop Feed involves two sets of primary bushings, allowing the transformer to be connected to a looped power circuit. This enhances reliability, as power can still be supplied from the other direction in case of a fault on one side of the loop.

Radial feed：

Radial Feed is a simple, cost-effective design where power flows from a single source to the transformer.

Our pad-mounted transformers are equipped with a complete range of high-quality accessories to ensure safe operation, reliable performance, and easy maintenance in demanding distribution environments.

At GE Transformer, every pad-mounted transformer undergoes a comprehensive series of factory tests to ensure its performance, safety, and long-term reliability. Our testing procedures strictly adhere to international standards—such as IEC and IEEE—thereby ensuring that every unit delivered meets the highest requirements for quality and operational excellence.

Visual and Construction Inspection
Inspection of tank structure, welds, coating, corrosion protection, nameplate, doors, compartments, grounding, and dead-front safety design to ensure integrity and compliance with safety requirements.

Winding Resistance Measurement
Measurement of winding resistance for each phase to verify proper connections and detect potential contact or overheating issues.

Voltage Ratio, Polarity and Vector Group Check
Verification of voltage ratio, polarity, and vector group to ensure compliance with design and system requirements.

Short-Circuit Impedance and Load Loss Measurement
Measurement of impedance voltage and load losses to evaluate transformer performance under rated load conditions.

No-Load Loss and No-Load Current Measurement
Measurement of core losses and excitation current to assess core performance and energy efficiency.

Insulation Resistance Measurement
Measurement of insulation resistance between windings and to ground as a preliminary assessment of insulation condition.

Applied Voltage Test (Power Frequency Withstand Test)
Application of power-frequency high voltage to verify insulation strength between windings and ground.

Induced Voltage Test
Application of elevated frequency and voltage to verify inter-turn insulation strength.

Sealing and Leakage Test
Pressure or sealing test of the tank to ensure no oil leakage and suitability for outdoor operation.

Tank Integrity Test
Verification of the mechanical strength and pressure resistance of the tank to ensure no deformation or leakage during transportation and operation.

Transformer Oil Test (for oil-filled units)
Testing of dielectric strength, moisture content, and other key oil parameters to ensure proper insulation performance.

Tap Changer Inspection (if applicable)
Verification of tap changer position, operation, and electrical continuity to ensure reliable voltage regulation.

Grounding Continuity Check
Verification of proper grounding of the tank and internal metallic parts for safety.

Accessories and Auxiliary Circuit Inspection
Inspection of bushings, fuses, load switches, and auxiliary/control circuits (if any) to ensure proper functionality.

Sound Level Measurement
Measurement of transformer noise levels to ensure compliance with applicable standards and environmental requirements.

Temperature Rise Test
Operation under rated conditions to verify that winding and oil temperature rise remain within permissible limits, ensuring long-term reliability.