Electrical Bushings Explained


Have you come across electrical high temperature bushings and wondered about their primary uses? If not, we will be learning about electrical bushings and their uses:

Two classifications of bushings:

1. Bulk or solid. It has two major components: a conducting rod and an insulator. The high temperature bushings come with conducting rod that is often made with aluminum or copper fiber bushing materials, whereas an insulator is made of composite resin, silicone rubber or porcelain.

2. Condenser or capacitance graded. This type of bushing is primarily used for higher voltages and is often called high temperature bushings or carbon bush bearing. The carbon bearing bush is uniquely made to make up for the high stress exerted by high voltage and graphite bushings material.

Why are temperature bushings needed?

Once a current flows through a conductor, several things will happen. The electric field that goes around the conductor and the intensity of the field depends on the voltage. Higher voltage means being able to experience high electric field intensity and vice versa. Electric field intensity and voltage are correlated.

As the electric field increases, it ionizes any insulator surrounding it. Typical things surrounding it are air and oil; as the insulators are ionized, their ability to conduct electrical current increases. The problem with live conductors at high voltages is that they tend to ionize any surrounding insulator. The ionization of these insulators allows current to flow to the ground.

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