the input mechanical power of a single alternator is
increased,its RPM increased but in case of an alternator
synchronised with grid its RPM does not increased with
increase of input mechanical power. why?
Answers were Sorted based on User's Feedback
Answer / ck misra
when the mechanical input to an alternator connected to
grid is changed it temporarily does increase the speed(RPM).
But an increase in speed means consequent increase in
frequency(as N=120f/P and P being the no. of poles is
constant)of the alternator.Now we know that the voltage and
frequency of grid busbar(what we call infinite busbar)are
constant(off course within some tolerance limit)and the
whole system has large electrical inertia which tends to
oppose any change in voltage level or frequency. So the
alternator is pulled back to synchronism by the grid.
BUT in case of stand alone alternator there is nothing to
pull the alternator back to synchronism and we can increase
the speed with a consequent rise in frequency....
Is This Answer Correct ? | 22 Yes | 1 No |
Answer / madhu balaji
whenever there is change in mechanical input to the
alternator, there will be change in rpm. but when it is
synchronised with busbar, there will be change in real
power shared by that alternator(i.e. when there is increase
in input, then real power shared by that alternator also
increases and vice-versa)
[similarly when excitation level of particular alternator
(synchronous generator)is changed, then reactive power
shared by that machine will be changed.]
Is This Answer Correct ? | 5 Yes | 1 No |
what is bus PT ?
Hi, We have have the major losses between BBT ( Bus Bar Trunking) to LT Incomer & LT to HT incomer, how to arrive the losses?
what are the names and size of various conductors used in transmission lines
How to perform a DC resistance test In Alternator and their proceduces?
how to reduce disel generator voltage from 410-60 hz to 380v-60hz
What is the field weakening mode of a ac motor?
Explain the laying procedure and laying depth of submarine cables under sea?
Two bulbs of 500w and 200w rated at 250 v will have resistance ratio as ?
2 Answers CGL, Dreamz Infra, Sunny Developers,
WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?
WHAT IS LINIER MOTOR?
If rotor works in clock wise what happens
what is cogging in motors?