Design of Transformer Bushings | Yash High-Voltage

Transformer bushings are made to fulfil the transformer's electrical, mechanical, and thermal requirements. Choosing the right insulating material, figuring out the dimensions of the bushings, and creating the interface with the transformer tank and related electrical system are all parts of the design process.

The following are the key aspects of the design of transformer bushings:

1. Insulation Material: In addition to having a high dielectric strength, strong thermal conductivity, and resistance to ageing and moisture, the insulation material used for transformer bushings must also be fireproof. Oil-impregnated paper (OIP), resin-impregnated paper (RIP), and synthetic polymers like silicone rubber or epoxy are the most often utilised insulation materials.

2. Voltage Rating: The highest voltage to which the transformer bushings will be exposed when in use determines the voltage rating of the bushings. The electrical and thermal stressors that affect the bushing, such as the electric field and temperature rise, are taken into account when determining the voltage rating.

3. Dimensions: The voltage rating, current rating, and mechanical loads that the transformer

   
   
   bushings will experience during operation all affect how big they should be. The electrical and mechanical performance of the bushing is significantly influenced by its length, diameter, and wall thickness.

4. Interface Design: To guarantee proper electrical and mechanical performance, the interface between the transformer tank and the bushing as well as the interaction between the bushing and the related electrical system must be properly constructed. The design must consider for elements including the materials' thermal expansion and contraction as well as the sealing system's ability to keep out moisture.

5. Testing: Transformer bushings are put through a number of tests to make sure they are dependable and effective. Electrical testing like the power frequency voltage withstand test, partial discharge test, capacitance and tan delta test, and mechanical tests like the thermal cycling test, short circuit test, and mechanical strength test are just a few of the tests that are performed.

   Overall, the design of transformer bushings is critical in ensuring the safe and reliable operation of transformers. The design process requires a thorough understanding of the electrical, mechanical, and thermal requirements of the bushings and their associated electrical systems.