Answer Posted / m. ahatesham shaikh
mostly electrical power is generated by running alternators with the help mechanical turbine. and turbines gives best efficiency in the speed range of 3000rpm to 3600rpm.
and frequency of generated electricity is given by
f=((P*N)/120)Hz, P= No. of poles of alternator, N= Speed in rpm.
and mostly 2 poles alternators are used.
therefore ((2*3000/)/120)=50
that's why some countries have selected 50Hz (using 3000rpm) and some 60Hz (3600rpm).
and India has selected 50Hz using 3000rpm.
| Is This Answer Correct ? | 10 Yes | 1 No |
Post New Answer View All Answers
Why PS class CT is always preferred for Differential protection?
What is meant by vector group
armature is that part in which current is induced since in dc motor we supply current to the conductor so why we call it armature?
my UPS suddenly goes off and all panel light also blow off.This happens even main electric supply is not interrupted.After some time it automatically starts functioning normally.Batteries are new.
why did youi choose this career?
what is Different between Bilinear and Unilenier?
what is the significance of cabability curve of alternator
DEAR SIR/MADAM,CLEARLY EXPLAIN ABOUT CRAWLING AND COGGING EFFECTS IN INDUCTION MOTOR.
when the time of backcharging the transformer three phases only enough or three phase with neutral is must.from these which one is the best one.
Explain dc generator with its types?
what material is used in capaciter
Pls mail me utility & Dg related question with answer
In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes
why various test are performed on electrical panels & power cables before commissioning on site & what are these test???
battery capacity use of made?
