3635 kVA Transformer With Rectifier-22/0.462 kV | South Africa 2022

Precise rectification, reliable power supply-choose our rectifier transformer to empower the future of industry!

01 General

1.1 Project Description

3635 kVA rectifier transformer was delivered to South Africa in 2022. The rated power of the transformer is 3635 kVA with OFAF cooling. The primary voltage is 22kV, the secondary voltage is 0.267/0.462kV, they formed a vector group of Yy0y6 or Dy5y11. Rectifier transformer is a rectifier equipment composed of transformers and rectifiers, in order to obtain direct current energy from AC power transformers, widely used in DC power transmission, electric traction, steel rolling, electroplating, electrolysis and other fields. The principle is similar to the transformer, the original side of the rectifier transformer is connected to the AC power system, called the network side; The secondary side is connected with the rectifier, called the valve side. The structural principle of the rectifier transformer is the same as that of the ordinary transformer.

A transformer with rectifier usually consists of two main parts:

Transformer part: It is used to change the voltage of the alternating current, usually converting the high-voltage alternating current to the low-voltage alternating current to adapt to the requirements of the rectifier circuit. This part is designed according to the needs of the application and can be a booster transformer or a step-down transformer.

Rectifier part: usually composed of diodes, thyristors and other rectifier components, the transformer converts alternating current into direct current. The design of the rectifier circuit will affect the quality of the output DC, such as the fluctuation and ripple of the output voltage.

1.2 Technical Specification

3635 kVA transformer with rectifier specifications type and data sheet

1.3 Drawings

3635 kVA transformer with rectifier diagram drawing and size.

02 Manufacturing

2.1 Core

The stack core of the transformer is one of its core components, which is mainly used for magnetic conductivity and improving the efficiency of the transformer. A laminated core usually consists of multiple silicon steel sheets stacked on top of each other, whose thickness and material are carefully designed to reduce eddy and hysteresis losses. In the manufacturing process, these silicon steel sheets are stacked in a certain direction to form a closed magnetic circuit. The design of laminated core can effectively reduce the energy loss and increase the performance of the transformer. The silicon steel sheet has low hysteresis loss and high mechanical strength, and can withstand the temperature and vibration generated by the transformer during operation. Through a reasonable superposition method, the stack core can effectively control the working state of the transformer, provide a stable voltage output, and improve the working efficiency and reliability of the overall electrical equipment.

2.2 Winding

High voltage continuous winding usually consists of a number of more turns of insulated wires, which are continuously wound on the iron core. Because of its many turns, it can withstand higher voltage, so it plays the role of increasing voltage in the rectifier transformer. The design of this winding usually takes into account the insulation strength at high voltages, using high-quality insulation materials to ensure that there will be no breakdown or leakage problems during operation. At the same time, the arrangement and process design of continuous winding make it have better electromagnetic compatibility and reduce electromagnetic interference. The low-voltage pie winding adopts the pie structure, which is usually composed of fewer turns and is suitable for the output requirements of low voltage. This winding is often composed of a plurality of disk or ring type conductors, separated from each other by insulation material, superimposed. The design of pie winding has good heat dissipation characteristics, which can effectively reduce the heat generated in large current to ensure the stability and safety of the equipment. In addition, the pie structure also helps to reduce leakage induction and impedance, improve the efficiency of current passing, so that the rectifier transformer can maintain a good dynamic response when the load changes.

2.3 Tank

The oil tank is made of high-strength steel plates welded together, ensuring mechanical strength and a tight seal to withstand internal pressure. oil tanks feature an oil conservator at the top, which helps balance the expansion and contraction of the transformer oil and prevents excessive internal pressure. The bottom of the oil tank is fitted with a drain valve for oil discharge during maintenance. The top may have a breather or gas relay to balance internal and external pressure while preventing moisture ingress.

2.4 Final Assembly

03 Testing

1. Measurement of Winding Resistance

2. Measurement of Voltage Ratio and Check of Phase Displacement

3. Check of Core and Frame Insulation

4. Applied Voltage Test

5. Induced Voltage Test

6. Measurement of No-Load Loss and Current

7. Measurement of Short-Circuit Impedance and Load Loss

04 Packing and Shipping

05 Site And Summary

SCOTECH rectifier transformers are engineered to deliver exceptional performance, reliability, and efficiency, tailored to meet the demands of modern industrial applications. With advanced technology, robust construction, and unparalleled precision, they ensure seamless power conversion and long-lasting durability. Whether you’re powering large-scale manufacturing, supporting critical processes, or driving innovative energy solutions, our special transformers provide the backbone for your success. Choose our products and experience the perfect balance of quality, innovation, and trust. Together, let’s power the future!