Answer / hunnsweethitesh007@gmail.com

when the 3 phase supply is given
to the stator of the 3 phase
induction motor the rotatory mag
feild is producd and feild is
cut by the conductor placed at
rotor and emf is induced due to
this curent is flow in cnductor
and it rotates and motor action
take place

Answer / rsr

3 phase supply fed to 3 phase stator winding produces rotating magnetic field rotating at synchronous speed. This field cuts the rotor conductors(bars) and according to faraday's law of electromagnetic induction, an emf is induced in the conductors. since the conductors are short circuited by end rings(squirrel cage), thus current stsrts flowing & it produces its own field. now, we have two fields - one produced by stator and other by rotor , the interaction of these two field led to the development of torque in the direction of rotating magnetic field as per the lenz law

Answer / deabjit dey

first current is flow,then conductor rotted atlast motor
action .

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

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