Electrical Engg. By Ashish sir
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. In an induction motor, no-load the slip is generally
Star Connections Line voltage is root 3 times of phase voltage.
star-connection-eq5
where ρ is a constant depending on the nature of the material of the conductor and is known as its specific resistance or resistivity.
Specific Resistance depends only on temperature and material of the conductor but not on its dimensions of the conductor, on which resistance depends, and mechanical deformation such as stretching etc. As ρ depends only on the material of a conductor at a given temperature, hence it is a characteristic constant.
For any given material at a certain given temperature, the resistance is given as
Which of the following is NOT correct about a star connected balanced 3-phase circuit? (SSC 2018 S-2)
Explanation
The star connection is formed by connecting the starting or finishing ends of all the three windings together. A fourth conductor that is taken out of the star point is called the neutral point. The remaining three ends are brought out for connection to load. These ends are generally referred to as R-Y-B, to which load is to be connected. The star connection is shown in Fig. In a star connection, we know that each phase is displaced in space by 120° from each other.
This is the three-phase four-wire star-connected system. If no neutral conductor is taken out from the system it gives rise to a three-phase, three-wire star-connected system.
The current flowing through each line conductor is called line current, IL in the star connection the line current is also the phase current. Similarly, the voltage across each phase is called phase voltage, Vph. The voltage across any two line conductors is called line voltage, VL. When a balanced three-phase load is connected across the supply terminals R, Y, B currents will flow through the circuit. The sum of these currents, i.e., IR, IB, and IY will be zero. The neutral wire connected between the supply neutral point and the load neutral point will carry no current for a balanced system.
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