Why, the starting current of 3 phase Induction Motor is 7
to 8 times its rated current?
Answer Posted / stalin raj
The motor needs high torque to starts its rotation.The
torque is directly proportional to the square of the
current.Hence it takes a large current at starting.
Is This Answer Correct ? | 7 Yes | 9 No |
Post New Answer View All Answers
1. If 8.35%Z means the percentage impedance of 132kV-line from power company, we will like to reconfirm its base capacity.
What is dc current source? Differentiate between ideal and non ideal current sources?
My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.
Explain using drawings what is reverse PID action w.r.t PID controllers.
A 11KV, 1200 A breaker combination fixed in a cubicle for HT motor.Is normally for 11 KV motor fuse is using? if Yes, What range fuse is required?
How does HT work & Voltage required?
How does a battary stores charge in it? please explain in simple manner and in detail.thanks
What is s-domain and its significance?
Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?
What is different between Difnit time and instatous over current relay
I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?
Why is remote backup preferred to local backup?
What is Fire Panel ? How it works ?
How one may guess the direction from which the distribution line is incoming if there is no pole plate on poles?
What are test signals and their significance?