Safety meets efficiency-choose our pad mounted transformers for seamless power solutions!
01 General
1.1 Project Description
This 500 kVA pad mounted transformer was delivered to America in 2024, the rated power of the transformer is 500 kVA, the primary voltage and secondary voltage of the transformer are 22.86/0.208 kV. This product has the characteristics of small size, easy installation and maintenance, low noise, low loss, anti-theft, strong overload capacity, full protection and so on. Applicable to new residential areas, green belts, parks, station hotels, construction sites, airports and other places. This product is suitable for loop power supply, dual power supply or terminal power supply system, as a power transformation, metering, compensation control and protection device.
We ensure that each one of our delivered units has undergone rigorous full acceptance testing. We provide one-package service from consulting, quoting, manufacturing, installation, commissioning, training to after sale services, our products are now operating in more than 50 counties in the world. We aim to be your most reliable supplier as well as your best partner in business!
1.2 Technical Specification
500 kVA pad mounted transformer specification and data sheet
| Delivered to | America |
| Year | 2024 |
| Type | Pad mounted transformer |
| Standard | IEEE C57.12.00 |
| Rated Power | 500 kVA |
| Frequency | 60HZ |
| Phase | 3 |
| Cooling Type | ONAN |
| Primary Voltage | 22.86 kV |
| Secondary Voltage | 0.208 kV |
| Winding Material | Aluminum |
| Angular displacement | YNyn0 |
| Impedance | 5%(±7.5%) |
| Efficiency | 99.35% |
| Tapping Range | ±2*2.5% |
| Liquid insulant | Mineral Oil |
| No Load Loss | 0.84KW |
| On Load Loss | 3.565KW |
| Accessories | Standard Configuration |
1.3 Drawings
500 kVA pad mounted transformer diagram drawing and size.
02 Manufacturing
2.1 Pressure Relief Gauge
| The pressure relief gauge on a pad-mounted transformer is a mechanical monitoring and protection device. It continuously indicates internal pressure via a color-coded dial and automatically vents dangerous overpressure-caused by faults like internal arcing-to prevent tank rupture. A visual indicator remains displayed after operation to signal that a pressure release has occurred, aiding in fault identification and maintenance. |  |
2.2 200A, 25 kV rotatable feedthru insert
 | The 200A, 25 kV rotatable feedthru insert is engineered to deliver dual bushings through a single equipment bushing well, streamlining two key operations: converting radial-feed transformers into feed-thru configurations and integrating in-line arrester protection with unmatched ease and practicality. Its standout feature is a patented integrated torque-limiting ratchet, which safeguards bushing well studs from accidental damage during installation. This ratchet mechanism also enables 360° rotation of the insert, allowing operators to position it optimally for specific application requirements. A bail assembly included in the kit secures the feedthru in its desired position once adjusted. Constructed with an all-copper current path and peroxide-cured EPDM rubber, the insert fully complies with IEEE Std 386™-2006. When paired with products of equivalent rating, it delivers a fully shielded connection solution. |
2.3 Tank
| Pad mounted transformer fuel tank design has a unique structure and function. The tank of this type of transformer is usually made of strong metal material, which can withstand the influence of external environment, and has good weather and corrosion resistance. The tank not only stores the insulating oil, but also provides the necessary cooling and protection of the transformer’s internal components. The oil tank of pad mounted transformer is usually designed to be sealed to prevent the entry of external moisture and contaminants, which can maintain the performance of the insulating oil and extend its service life. Insulating oil plays an important role in this design, in addition to providing insulation protection, it also helps dissipate heat through convection and heat dissipation mechanisms, thus ensuring safe operation of the transformer under high load conditions. In order to facilitate operation and maintenance, many ground transformers are equipped with viewing Windows, oil level gauges and temperature sensors on the tank to monitor changes in oil level and temperature in real time. In addition, the shape of the tank is usually designed to be compact, so that it can be flexibly arranged in urban environments, and the bottom is often equipped with a leakproof structure to ensure that in the event of accidental leakage, it can effectively prevent pollution to the environment. |  |
2.4 Final Assembly
Base Installation: Secure the transformer base in the designated position, ensuring it is level and stable.
Core and Winding Installation: Insert the transformer’s core and windings into the enclosure, ensuring proper alignment and secure attachment.
Insulation Treatment: Insulate the windings using oil-impregnated or other insulating materials to enhance safety and performance.
Terminal Connections: Install the high voltage and low voltage terminal connections, ensuring they are secure.
Sealing and Oil Filling: Seal the enclosure to prevent water and dust intrusion, and fill with transformer oil if necessary.
2.5 Temperature Gauge
 | The temperature gauge on a pad-mounted transformer is a device for monitoring the internal oil or winding temperature. Traditional units often feature a direct-reading dial-type (bimetallic) gauge, while modern transformers are typically equipped with electronic gauges that provide remote output signals (e.g., 4-20mA or digital communication) for SCADA systems and over-temperature alarms. Its primary function is to ensure safe operation by preventing overheating due to sustained overloads or cooling failures, thereby protecting insulation life and optimizing load management. |
2.6 Low-Voltage Neutral Bushing
| The low-voltage neutral bushing provides the external connection point for the transformer’s internal neutral. It typically features a fully insulated, dead-front design with a loadbreak interface for safe hot-stick operation and includes an integrated grounding/test point. This allows for easy system grounding, safe isolation, and convenient disconnect for insulation testing, making it essential for both system safety and field maintenance. |  |
03 Testing
04 Packing and Shipping
05 Site And Summary
I appreciate your interest in our Three Phase Pad Mounted Transformer. Our products are renowned for their exceptional electrical performance, reliable safety, and outstanding durability, capable of meeting a wide range of complex power demands. By seamlessly integrating advanced technology with high-quality materials, our transformers ensure that your power systems operate efficiently and stably, adapting to the challenges of modern commercial and industrial environments. By choosing our pad mounted transformers, you will receive unparalleled support and service. Let us work together to create a brighter energy future.
