1.Introduction

In power systems, transformers are indispensable electrical equipment, and their operational stability and safety directly affect the reliability of the entire grid. Transformer bushings, as an important part of transformers, have a performance that directly impacts the transformer's operational efficiency and lifespan. Especially under high-current conditions, transformer bushings need to withstand massive current surges and heat accumulation, making the study and design of high-current transformer bushings particularly important.

2.Working Principle of High-Current Transformer Bushings

High-current transformer bushings are key components connecting the internal windings of a transformer to the external power system. They must handle high-voltage electrical insulation while transmitting large currents. Their working principle mainly relies on an effective combination of insulating materials and conductive materials to achieve electrical isolation and current transmission functions. Inside the bushing, the conductive rod serves as the path for current, while the insulating materials isolate high and low voltages, preventing electrical breakdown.

3.Structural Features of High-Current Transformer Bushings

The structural design of high-current bushings is complex and needs to meet multiple performance requirements. Generally, it consists of conductive rods, insulating materials, the outer shell, and accessories:

1.Conductive Rods: Usually made of highly conductive metals like copper or aluminum, ensuring efficient and stable current transmission.

2.Insulating Materials: The choice of insulating material is key in bushing design. It must have excellent electrical insulation, heat resistance, and mechanical strength. Common insulating materials include insulating paper, insulating oil, and resins.

3.Outer Shell: The outer shell serves as the protective structure, usually made of metal such as stainless steel or aluminum alloy, providing sufficient mechanical strength and protection.

4.Accessories: Accessories include terminals, seals, and explosion-proof devices, enabling connection, sealing, and protection functions for the bushing.

5.Technical Challenges of High-Current Transformer Bushings

Under high-current conditions, transformer bushings face many technical challenges. Firstly, due to the large increase in current, internal heat accumulation becomes especially significant, which could degrade the performance of insulating materials and even trigger electrical breakdown. Secondly, high current generates enormous electromagnetic forces on the conductive rod and outer shell, placing higher demands on the bushing's mechanical strength. Moreover, bushings also need good heat dissipation and corrosion resistance to adapt to complex operating environments.

6.Optimized Design of High-Current Transformer Bushings

To address the technical challenges, high-current transformer bushings require optimization from multiple aspects. Firstly, using superior insulating and conductive materials can enhance electrical insulation performance and current transmission efficiency. Secondly, advanced cooling techniques and structural designs can reduce internal temperatures and improve operational stability. Additionally, employing advanced manufacturing processes and inspection technologies can enhance the quality and reliability of the bushings.