eeefacts

To connect the metallic Parts of an Electric appliance or installations to the earth to discharge the current to ground is called  Earthing  or  Grounding . Also, to connect the metallic parts of electric machinery and devices to the earth plate or earth electrode (which is buried in the moisture earth) through a thick conductor wire (which has very low resistance) for safety purpose is known as  Earthing or grounding . The potential of earth is 0 volt. To earth or earthing, means to connect the part of electrical apparatus such as metallic covering of metals, earth terminal of socket cables, stay wires that do not carry current to the earth. Importance of earthing ●       To protect human lives as well as provide safety to electrical devices and appliances from leakage current. ●       To serve as a return conductor in electric traction system and communication. ●    ...

Auto transformer This transformer is used for step up and step down applications. In this primary and secondary are not electrically isolated. An auto transformer has winding common to both primary and secondary, the input and output windings are electrically connected as one continues winding. Its application include starters and interconnection of high voltage lines. Advantage of auto transformer over 2 winding transformer Autotransformer required less volume of core materials. In this no isolation required between primary and secondary winding as it has common winding between input and output circuit. Size and weight are less due to common winding. KVA rating of auto transformer is high as compared to 2 winding transformer. Efficiency of auto transformer will be high as low loss as copper requirement will be less. Analysis of single phase  Autotransformer  A single-phase autotransformer having N1 turns primary with N2 turns tapped for ...