75 kVA Transformer On Power Lines-12.4*24.94/0.12*0.24 kV | Saudi Arabia 2023

Simplifying Power Delivery: Single Phase Pole-Mounted Transformers for Reliable Energy Solutions!

01 General

1.1 Project Description

This 75kVA single phase pole mounted transformer was delivered to Saudi Arabia in 2024. The rated power of the transformer is 75kVA., The primary voltage and secondary voltage of the transformer is 12.4GRDY/7.2*24.94GRDY/14.4-0.24/0.12kV; high voltage is dual high voltage. An additional dual voltage switch than a common single-phase transformer.

Pole-mounted transformers are essential for efficient electrical distribution, designed to minimize the distance of low-voltage lines and significantly reduce energy losses. Their compact and lightweight design allows for quick installation on utility poles, lowering infrastructure costs-particularly beneficial in rural and underserved areas.

With advanced coil core technology, these transformers achieve over 60% reduction in line losses, improving the reliability of the power supply. Their fully sealed construction protects against environmental factors, ensuring durability and safe operation during overloads.

Versatile in application, pole-mounted transformers cater to agricultural facilities, remote villages, and urban infrastructure improvements. Their low maintenance requirements and high reliability make them a smart choice for enhancing electricity distribution systems, providing accessible power to diverse communities.

1.2 Technical Specification

75kVA single phase transformer specification and data sheet

1.3 Drawings

75kVA single phase pole mounted transformer dimensions and weight details

02 Manufacturing

2.1 Core

The iron core is one of the most basic components of the transformer, which is the magnetic circuit part of the transformer. The primary and secondary windings of the transformer are on the iron core. In order to improve the magnetic permeability of the magnetic circuit and reduce the eddy current loss in the iron core, the iron core is made of silicon steel sheet with surface insulation. The iron core is divided into two parts: the iron core column and the iron yoke. The winding is set on the iron core, and the iron yoke connects the iron core to form a closed magnetic circuit. In order to prevent discharge caused by high induced suspension potential of metal components such as transformer core, clamp and pressure ring during operation, these components must be grounded at a single point. In order to facilitate testing and fault finding, large transformers generally ground the iron core and clamp through two bushings respectively.

2.2 Winding

The transformer winding structure adopts layer winding, in which the winding coils are divided into multiple layers and alternately placed on the iron core. This design helps minimize the voltage gradient of the coil and increases the insulation performance of the transformer. Specifically, the characteristics of the layer winding include: Cross winding: Layer winding is the winding coils are stacked on the iron core to reduce the electromagnetic induction gradient, reduce the voltage stress in the winding, and improve the insulation capacity. Reduce magnetic leakage induction: Because of the cross placement between winding coils, layer winding can effectively reduce magnetic leakage induction and improve the transmission efficiency of electromagnetic energy. Reduce eddy current loss: Due to the concentrated arrangement of winding coils, the eddy current loss in the winding can be reduced and the efficiency of the transformer can be improved.

2.3 Tank

The tank design may be optimised in terms of cost and weight, reducing the overall shipping dimensions and weight. The vibration levels on the tank surfaces can be greatly reduced, giving increased reliability in service. A stiffer tank design transmits less of the internal noise generated by the core (the main source of no-load noise) and windings (the main source of load noise) to the outside, resulting in a quieter transformer in service. This is especially important given the tighter environmental controls now in place for noise pollution. Electrostatic spray treatment, 50 years do not remove paint (coating corrosion resistance within 100h, hardness ≥0.4) Cylinder type fully sealed construction with self-sealing manual pressure relief valve (ANSI specification) Standard NEMA hanger brackets (each unit includes pole support rack plates) Fully sealed structure, maintenance-free, normal operation life of more than 30 years

2.4 Final Assembly

Core Assembly: Assemble the core components tightly together. Winding Installation: Wind the primary and secondary coils according to standards and perform insulation treatment. Insulation Structure Assembly: Install insulation materials to ensure safety under high voltage. Enclosure Assembly: Assemble the protective enclosure to prevent environmental impact. Cable Connection: Connect the cable leads to ensure a stable interface.

03 Testing

04 Packing and Shipping

4.1 Packing

Wrapping: The transformer is wrapped in insulating and shock-absorbing materials, such as foam padding and bubble wrap, to prevent damage during handling and transit. Boxing: Place the transformer in a sturdy wooden box designed to withstand impacts and rough handling, providing additional protection. Securing: Inside the wooden box, the transformer is secured with straps or braces to immobilize it and prevent movement during transport. Sealing and Labeling: The wooden box is sealed and labeled with handling instructions and warning labels to indicate the fragile nature of the contents.

4.2 Shipping

Loading: Carefully load the transformer onto a flatbed truck or specialized trailer, ensuring balance. Securing: Secure the transformer with straps or chains to prevent movement. Route Planning: Plan the best transportation route, considering road conditions and weight limits. Handling Precautions: Handle carefully during loading and unloading to avoid impacts or jolts. Arrival and Unloading: Upon arrival, safely unload and place the transformer in the designated area.

05 Site And Summary

In the context of energy transition and sustainable development, the single-phase pole-mounted transformer has become an essential device in modern power systems due to its efficient and stable power transmission capabilities. It improves energy utilization efficiency and reduces energy consumption while ensuring safe operation in various environments. With its excellent overload resistance, it supports the construction of power infrastructure. By minimizing energy loss and utilizing high-quality materials, this transformer demonstrates vast application potential, promoting green sustainable development. Choosing our product means opting for an environmentally friendly and efficient power solution, as we work together to create a better future.