Solution: The device used for switching, controlling and protecting the electrical circuits and equipments. Example: 1.Fuse 2.Circuit breaker 3.Relay 4.Switches
Solution: The phenomenon of violet glow,Hissing noise and protection of ozone gas is an overhead transmission line. Corona occurs only when the electric field intensity is greater than dielectric strength of air. Reason for Corona: 1. Electrical power transmission is at higher operating voltage. 2.Number of free electron in the spacing surrounding the power conductor or more due to radio activity.
Solution: Surge Impedance: Impedance of the transmission line without losses is called Surge Impedance. Zs = √(L/C). Surge Impedance Loading: The power delivered by the line to a purely resistive load equal to it's surge impedance or the load at which inductive and capacitive,reactive volte amphere are equal and opposite this is called surge impedance loading. SIL = VsVr / Zs
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