Out of Sight, Never Out of Service. The Discreet Pad-Mounted Transformer.
01 General
1.1 Project Description
2000 kVA three phase pad mounted transformer was delivered to USA in 2025. The rated power of the transformer is 2000 kVA with KNAN cooling. The high voltage is 24.9GrdY/14.376 kV with ±2*2.5% tapping range (NLTC), the low voltage is 0.48Y/0.277 kV, they formed a vector group of YNyn0.
SCOTECH’s pad mounted transformer is engineered to deliver superior reliability, efficiency, and safety for medium-voltage distribution networks. Equipped with a 3-phase 5-limb core design, it ensures minimal magnetic leakage and stable voltage regulation even under fluctuating loads, while meeting stringent DOE efficiency standards to cut energy losses and operational costs. Filled with FR3 natural ester fluid, this unit offers exceptional fire safety, biodegradability, and extended service life compared to conventional mineral oil, making it ideal for environmentally sensitive and high-risk installations. Integrated surge arresters provide robust protection against transient overvoltages, safeguarding internal components from lightning and grid disturbances. A side-mounted meter cabinet enables convenient on-site monitoring, maintenance, and meter reading without disrupting power supply, and its RAL 9003 powder-coated white finish ensures excellent corrosion resistance and durability in harsh outdoor conditions. This transformer is a technically advanced solution for reliable power distribution.
1.2 Technical Specification
2000 kVA pad mounted transformer specifications type and data sheet
| Delivered to | USA |
| Year | 2025 |
| Type | Pad mounted transformer |
| Standard | IEEE Std C57.12.34-2022 |
| Rated Power | 2000 kVA |
| Frequency | 60HZ |
| Phase | 3 |
| Feed | Loop |
| Front | Dead |
| Cooling Type | KNAN |
| Primary Voltage | 24.9GrdY/14.376 kV |
| Secondary Voltage | 0.48Y/0.277 kV |
| Winding Material | Aluminum |
| Vector Group | YNyn0 |
| Impedance | 5.75% |
| Efficiency | 99.51% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 1.95 kW |
| On Load Loss | 13.15 kW |
1.3 Drawings
2000 kVA pad mounted transformer diagram drawing and size.
02 Manufacturing
2.1 HV Bushing
| Chardon’s 15/25/35kV 200A class bushing insert serves as the HV bushing for pad mounted transformers, designed to mate with loadbreak elbows and assemble to ANSI/IEEE 386-compliant bushing wells for efficient on-site installation and replacement. It requires cleaning, uniform application of provided silicone grease, clockwise tightening to 150-180lb-in torque, and connection of a #14 copper ground wire, with installation and maintenance performed by qualified personnel on de-energized systems using proper protective equipment. |  |
2.2 Four Position Loadbreak Switch
 | The four-position loadbreak switch for pad mounted transformers (model FYN33-24-315) has a rated voltage of 12kV (24kV) and rated current of 315A, with key specifications including 65kV/1min AC withstand voltage (79kV/1min for fracture), 125kV lightning impulse voltage, 25kA/4s short-time thermal current, 63kA dynamic stable current, and mechanical life exceeding 3000 operations. It features a 145kV isolation fracture, mounts inside the transformer tank (tank wall thickness 6-8mm) with 4 M10 fixing nuts, and is equipped with 4 external limit pins (8mm diameter, 16mm height) for reliable loadbreak operations. |
2.3 Grounding Copper Bar
| The grounding copper bar installed on the low-voltage side of the pad mounted transformer is a high-conductivity copper component, firmly connected to the transformer’s grounding system. It provides a reliable path for fault current, effectively diverting abnormal current to the ground to protect the transformer and associated equipment from damage, while safeguarding personnel safety during operation. |  |
2.4 1'' Upper Fill Valve
 | The 1” upper fill valve for pad mounted transformers is a top-mounted component designed for transformer oil filling and replenishment. It adopts a 1” connection size, ensures tight sealing to avoid oil leakage, enables convenient and efficient oil addition during installation or maintenance, and is compatible with standard pad mounted transformer tank configurations for reliable performance. |
2.5 Vacuum Pressure Gauge
| The YZ-70 vacuum pressure gauge for pad mounted transformers is a dedicated instrument to monitor transformer operation by reflecting pressure changes caused by temperature variations. It offers optional measuring ranges (-0.04~0.04MPa or -0.08~0.08MPa), ±2.5% accuracy, operates in -40℃~80℃ temperature and ≤80% humidity, features a Φ70 dial and M27×2 adjustable screw mounting, requires vertical installation (avoiding gauge case handling during assembly), prohibits exceeding 3/4 of the range limit, and needs a 6-monthly regular check with pre-installation sponge removal. |  |
03 Testing
Pad mounted transformer tests, compliant with IEEE C57 series standards, include routine electrical and mechanical checks such as winding resistance, voltage ratio, phase relation, no-load/load loss, insulation withstand (applied/induced voltage), insulation resistance, and pressure leak test, as well as optional performance verifications, all to validate electrical safety, insulation integrity, operational reliability, and structural sealing for stable power distribution.
04 Packing and Shipping
05 Site And Summary
We understand that every project has unique power requirements, and our team is committed to providing tailored solutions that align with your specific goals. From custom voltage configurations to compliance with global industry standards, SCOTECH stands behind every unit with rigorous testing, expert technical support, and a dedication to long-term durability. Choose SCOTECH pad mounted transformers for a power solution that doesn’t just meet your needs, but anticipates them. Let’s power your projects forward-contact our sales team today to discuss your requirements and take the first step toward a more efficient, resilient energy future.
SCOTECH – Powering Progress.
