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Synchronous Motor Vs Induction Motors Speed
Synchronous motor rotates with constant speed but induction motor is not like that, Why? What is the construction difference between Synchronous motor and Induction Motor?
pveee
- Dec 26th, 2011
Synchronous motor are constant speed motors where IM are variable speed motors.
Synchronous motor requires special starting set up where as IM are self stared. -
Voltage Drop
How to can calculate voltage drop in a cable?
pveee
- Dec 29th, 2011
Voltage drop in 3 phase circuits is Vd=(1.732xI(RcosФ + XsinФ)L)/(1000xno.of runs)
I is full load current,
R resistance of the conductor,
x resistance of the conductor,
L length of conductor in meters.
bijumenon
- Oct 25th, 2009
According to me this is how the voltage drop in a cable is calculated.If*SQRT(Rf Cos(phi) + Xf sin(phi)) / no. of runswhere....If is the full load currentRf and Xf is the resistance and reactance of the feeder. (Rf = R *L/1000; L= length of the feeder).
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Transformer Capacity
If the capacity of a Transformer is 20/26 then what does 20/26 shows? what is its purpose?
pveee
- Dec 29th, 2011
If 20/26 is in kva 20kva indicates capacity of transformer under ONAN cooling.
If the capacity is 26kva it is provided with ONAF cooling.
If 20/26 is voltage 20 indicate primary side voltage, 26 indicates secondary voltage, it is stepup transformer. -
Induction Motor
Why transformer does not rotate like induction motor. Inspite both having same principle?
