EECE 470L Final, Fall 2013

(The switch is open) transformers are connected as shown in fig ¢ 3) secondary line voltage for each is 380V and the voltages across the switch yqual, [.e. : Voc’ = Vbb' = Vaa’ = Vs ro close the switch, it is necessary that ) Vs = 380V ) Vs = 380/ {3v 5 Vs = 0V ) Vs = 60 V otors is estimated from no-load test magnetizing reactance of induction m' @y b) F the induction motor, there is a transfer of @y b) F t of an induction motor Is meas The starting curren a)T OF power from stator to rotor ured at higher voltage tor. Comment on it ar ff / wat 4) oO a 3-phase synchronous mo 5. Fig. (1) shows the V-curve of ccurs. fox We ge 5 show where the point of instability 0 esents the characteristic of a cumulatively 6. Infig. (2), which curve repr nded DC motor 2 B le} compou None A (ut-cigmieot : 19) In electric locomotives where a very high starting torque is most suitable DC moior is : a) cumulatively compounded motor b) differentially compounded moior c) shunt motor n curve represents the characteristic of a e induction motor is ansformer (i ccinriot : 19) In electric locomotives where a very high starting torque is most suitable DC moior is : a) cumulatively compounded motor b) differentially compounded moior c) shunt motor