150 kVA Pad Mounted Transformer-34.5/0.208 kV | USA 2024

Unfazed by high-load challenges, delivering 24/7 stability – Three-Phase Pad Mounted Transformer, ensuring uninterrupted power supply!

01 General

1.1 Project Description

This 150 kVA three phase pad mounted transformer was delivered to South America in 2024. The rated power of the transformer is 150 kVA, with the primary voltage 34.5GRDY/19.92 kV to secondary voltage 0.208GrdY/0.12 kV. The connection group is YNyn0, the cooling is ONAN. The three phase pad mounted transformer is a compact power distribution device that combines high-voltage switchgear, distribution transformer, low-voltage switchgear, electric energy metering equipment and reactive power compensation device in one or several boxes according to a certain wiring scheme. That is, high voltage power, transformer step-down, low voltage distribution and other functions are organically combined together, installed in a moisture-proof, rust-proof, dust-proof, fireproof, anti-theft, heat insulation, fully enclosed, mobile steel structure box, mechatronics, fully enclosed operation, Applicable to factories, mines, oil fields, ports, airports, urban public buildings, residential areas, highways, underground facilities and other places.

1.2 Technical Specification

750 KVA pad mounted transformer specification and data sheet

1.3 Drawings

300 KVA pad mounted transformer diagram drawing and size.

02 Manufacturing

2.1 Core

The core adopts high quality and high permeability silicon steel sheet, multi-step process, bass noise reduction, low no-load loss. The design of the iron core adopts the “E-I” type or “ring” structure. The E-I type can effectively reduce the flux leakage and eddy current loss by superimposing the E-shaped and I-shaped silicon steel sheets together to form a closed-loop magnetic circuit. The annular core further reduces energy loss through the annular design and provides a better flux path. Each sheet of silicon steel is insulated, usually with insulating paint or coated with insulating paper, which reduces the generation of eddy currents. The lamination process of the iron core superimposes the sheets into layers to ensure the permeability of the iron core while minimizing the hysteresis loss of the iron core.

2.2 Winding

The winding is the most basic component of the transformer, which is the circuit part that establishes the magnetic field and transmits electrical energy. It is wound by the aluminum wire wrapped in insulating paint (that is, enameled wire) and is set on the iron core column of the transformer. Layer winding uses multiple insulation layers, each layer is separated by insulation material, which helps to improve the insulation strength, reduce the risk of electrical breakdown, and improve the voltage resistance and safety of the transformer. The design of the layer winding facilitates the uniform distribution and dissipation of heat. The space and insulation between each layer of winding helps to efficiently conduct and dissipate heat, reducing the risk of overheating and improving the operational reliability of the transformer. Because the structural design of the layer winding can reduce electromagnetic interference, the layer winding helps to improve the electromagnetic compatibility of the transformer, reduce the impact on the surrounding equipment, and improve the stability of the system. The layered structure of the layer winding can provide better mechanical strength and stability, especially in high voltage and high power applications, can effectively resist mechanical stress and vibration, and extend the service life of the transformer.

2.3 Tank

The welding process must meet the standards, including welding position, welding current, welding speed, etc. Before welding, clean the welding area to ensure that there is no oil or rust. The surface of the tank should be treated with rust removal and sand blasting to ensure smooth surface. It is then coated to ensure that the tank is resistant to corrosion. All seals are sealed at the end limit; The metal parts inside and outside the box are rounded to remove hair, and the weld seam and seal are tested for three times (fluorescence, positive pressure, negative pressure leakage test); The paint is made according to the rust prevention requirements of household appliances.

2.4 Final Assembly

03 Testing

1. DC resistance test.

2. Insulation resistance test.

3. Measurement of voltage ratio and vector group.

4. Separate source AC withstand voltage test.

5. Induced AC withstand voltage test.

6. Measurement No-load loss and no load current.

7. Measurement load and impedance.

8. Resistance loss and efficiency.

9. Seal test.

04 Site And Summary

Thank you for your interest in our three-phase pad-mounted transformer! Combining reliability with high performance, our product embodies exceptional design to meet your needs for efficient power supply, durability, and safety. Whether for commercial areas, industrial applications, or renewable energy solutions, we are dedicated to providing you with professional and customized services. For more information or tailored solutions, please feel free to contact us. We look forward to working with you to create a brighter future in power solutions!