Why is the shape of high voltage feedthrough bushings important for insulation?

In summary, high voltage feedthroughs, also known as bushings, have a cone shape and ceramic insulation to prevent creep, strike, and uniform voltage gradient. Without this insulation, the bushing would be susceptible to breakdown over time. The cone shape allows for a more uniform voltage gradient and is determined by factors such as distance and environment.
  • #1
LimJH95
1
0
Why does high voltage feedthrough have a ceramic insulation. What would happen without that insulation?
Why is it shaped like conical like a tree?
 
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  • #2
I am assuming you man something line http://pimg.tradeindia.com/00018889/b/0/HV-Bushing-.jpg - in the US we refer to this item as a bushing. There are three major electrical factors at work, Creep: the distance along the SURFACE from the conduct to the mount ( flange or ground - but the surface you are going through) - thus the skirts - depends on environment. Next is Strike - this is the THROUGH THE AIR distance from the conductor to mounting flange resulting in the overall size / length of the bushing. Lastly and less known is uniform voltage gradient - this is how the Voltage gradient inside the insulating material is spread between the conductor and the flange, the higher the voltage the more important this becomes.. This ensures the insulation material does not break down over time, and is the main reason for the cone shape.
 

What is a high voltage feedthrough?

A high voltage feedthrough is a specialized component used in high voltage systems to transfer electrical signals from inside a sealed container to the outside without compromising the integrity of the seal.

How does a high voltage feedthrough work?

A high voltage feedthrough typically consists of a conductor, insulator, and terminal. The conductor carries the electrical signal while the insulator prevents it from escaping the container. The terminal allows for connection to the outside circuit.

What are the applications of high voltage feedthroughs?

High voltage feedthroughs are commonly used in vacuum systems, particle accelerators, X-ray equipment, and other high voltage applications where a hermetic seal is required to maintain a controlled environment.

What are the key factors to consider when selecting a high voltage feedthrough?

The key factors to consider when selecting a high voltage feedthrough include the voltage rating, current capacity, insulation material, and sealing method. It is important to choose a feedthrough that can handle the specific requirements of the application.

How can high voltage feedthroughs be maintained and tested?

Regular maintenance and testing of high voltage feedthroughs is essential to ensure their proper functioning. This can include visual inspections, electrical testing, and cleaning. It is important to follow manufacturer guidelines and safety protocols when performing maintenance and testing.

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