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In electric power, a bushing is a hollow electrical insulator that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it.
- What is the purpose of bushing?
- What are the types of bushing?
- What is Wall bushing?
- What are bushings transformers required for?
- How do bushings work?
- Why is it called a bushing?
- What are the advantages of bushing?
- What are bushings made of?
- What is primary bushing?
- What is difference between bushing and bearing?
- What is LV bushing?
- What is condenser bushing?
- What is the difference between insulator and bushing?
- What is bushing in construction?
- Why do transformer bushings fail?
What is the purpose of bushing?
Bushings, (sometimes called plain bearings, plain bushings, or sleeve bearings) reduce friction between two surfaces sliding against each other.
What are the types of bushing?
There are three types of bushings generally used in EHV transformer applications: oiltoair, oiltoSF6, and oiltooil type. The graded bushing has a more uniform distribution of potential as compared to that of the ungraded bushing.
What is Wall bushing?
A wall bushing is an insulated device that allows an electrical conductor to pass safely through a wall, which is usually earthed. You can choose out of different types of bushings: indoor-indoor wall bushing (both sides of the wall are indoor) ... High voltage Condenser and RIP bushings.
What are bushings transformers required for?
Their purpose is to control the voltage field around the center conductor so that the voltage distributes more uniformly across the surrounding insulation system in the bushing.
How do bushings work?
How does a bushing work? Bushings, also called sleeve bearings, are just one specific type of bearings. They are made to slide over rods to provide an extremely low-friction motion. ... Self-lubrication is achieved through a uniform pattern of indents on the surface of the bushing that act as grease reservoirs.
Why is it called a bushing?
bushing (n.)
"metal sleeve fitted into a machine or hole," 1839, from gerundive of bush (n.) "metal lining of the axle hole of a wheel or touch hole of a gun" (1560s), which is from Middle Dutch busse "box" (cognate with the second element in blunderbuss).
What are the advantages of bushing?
The main advantage of a bushing, as compared to a solid connection, is less noise and vibration are transmitted. Another advantage is that they require little to no lubrication.
What are bushings made of?
Bushings can be made of a variety of materials, such as bronze, steel-backed babbitt, plastic, nylon, or cast iron. The key to the material design depends on the type of use the bushing will experience. The bushing material must support and protect the component from damage.
What is primary bushing?
High-voltage (primary) bushings are used for connecting the high-voltage cables outside of the tank to the primary leads on the inside of the tank through the tank wall.
What is difference between bushing and bearing?
A bushing is a thin tube or sleeve that allows relative motion by sliding (our type), as compared to rolling. A bushing might also be called a sleeve bearing. ... A bearing is the general term for something that allows relative motion between two components, surfaces, etc.
What is LV bushing?
LV MV HV Bushings 1,000V 11kV 33kV
Webster-Wilkinson transformer bushings are used in transformers as a means of electrical / mechanical connection from the outside of the tank (cables or overhead lines) to the inside of the tank (transformer windings).
What is condenser bushing?
Condenser bushings are devices which allow high voltage conductor to pass through grounded walls of power transformer. Condenser bushings should meet the electrical, thermal and mechanical requirements of the application which is taken into consideration.
What is the difference between insulator and bushing?
Insulator bodies, when assembled with specific electrical hardware, become bushings designed for specific ratings and applications. Insulators and electrical hardware are sold individually.
What is bushing in construction?
an electrical bushing is defined as “an insulating structure, including a through conductor or providing a central passage for such a conductor, with provision for mounting a barrier, conducting or otherwise, for the purpose of insulating the conductor from the barrier and conducting current from one side of the ...
Why do transformer bushings fail?
What Causes Power Transformer Bushing Failures? ... The major causes include winding and/or insulation failure, tap changer failures, and bushing failures. The bushing failures are of very high importance due to the failure mechanism.
