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  Electrical Machines and Appliances

Introduction to Winding Insulating Materials

The Electrical insulating materials are described as materials that present a very large resistance to flow of current, and for that cause they are employed to maintain the current in its appropriate path along the conductor. This is manifest while we touch an electric machine while it is under operation.

We do not receive any electric shocks, due to the insulation. Insulation's crash results in short circuiting of the coils, causing electric currents to flow in accidental paths. This might as well cause electric shocks to human beings operating the machinery and as well harm the machines. Needs of good insulating materials include physical properties, availability, reliability, cost, adaptability to machining operations etc. Dielectric materials and Electrical insulation involves several forms of materials which surround and protect electrical conductors and prevent not wanted current flow, leakage. Electrical specifications involve dielectric strength, electrical resistivity, and dielectric constant.

Electrical Properties

Electrical Resistivity:

Electrical Resistivity is the electrical resistance (ohm-cm) to the flow of current through it. Its value should be extremely high. Resistivity is the opposite of conductivity.

Dielectric Strength:

Dielectric strength is the utmost voltage gradient which the material can withstand before electrical breakdown takes place. This value specified like 'kV/mm' should be extremely high even for extremely thin films.

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