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What is the purpose of bushing in a transformer?
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 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 kind of bushings will be used in the transformer above 33KV rating?
Oil filled bushings consisting of a hollow porcelain cylinder of special shape with a hollow tube shaped conductor through its centre used for the voltage above 33 KV.
Where do we use bushings?
Bushings are akin to thin tubes most commonly used for machinery with rotating or sliding shafts to improve efficiency and reduce vibration and noise. Bushings can be used for drilling operations in drill jigs, hydraulic external gear pumps and motors.
Where are bushings used?
Why Bush is used in motor?
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 is the bushing of a power transformer?
The Bushing of power transformer is a type of porcelain or ebonite post insulator put on the top or side of the transformer tank through which connections are made to the external circuit. Porcelain insulator bushing used upto 11 KV.
What is oil impregnated paper transformer bushing technology?
The traditional Oil Impregnated Paper (OIP) bushing technology as a transformer bushing types uses oil as its basic insulating medium. Use of oil has many severe drawbacks in bushing life, such as being susceptible to moisture ingress and oil leakage due to worn out seals.
Can you use oil in a transformer bushing?
Use of oil has many severe drawbacks in bushing life, such as being susceptible to moisture ingress and oil leakage due to worn out seals. In turn, a greater vulnerability in an OIP transformer bushing type exists to lightning strikes or other factors that can trigger explosive failure.
What type of bushings are used for high voltages?
For higher voltages say 132kv, 220kv, 400kv, 800kv; oil filled condenser bushings are used. In these bushings, the actual insulation is oil impregnated paper, housed in a porcelain housing. So, the porcelain housing acts as a container as well as weather shield for the oil and paper insulation inside it.