why the motor is rated as kw& transformer as kva
Answers were Sorted based on User's Feedback
Answer / k.prakashchandra
The output of motor is mechanical power, denoted in both hp
and equivalent KW ,whereas output of Tr is AC electrical
and actual power is KVA x PF .
Is This Answer Correct ? | 9 Yes | 7 No |
Answer / r.v.giribabu
rating of the any equipment is specified depending upon the
usage.
since motor is mechanical device which delivers the
mechanical output, so the amount of Mechanical output to be
specified. further, Voltage, PF also specified for
identifying suitability of installation of the motor and
efficiency for effectiveness of the motor.
In Transformers, Output and Input is Purely KVA. losses,
capacity of tranformer only depends on KVA and Voltage . KW
change or PF change will not effect the losses and capacity
where it is installed.
thats why the motor is rated as kw& transformer as kva.
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / k.prakashchandra
Transformer gives AC electrical output and the current is
proportional to KVA.With motor we get mechanical output and
should be in HP only.But the HP is converted into KW to get
electrical details
Is This Answer Correct ? | 3 Yes | 2 No |
Answer / nilkanth tailor
Transformer and genrator PF depends on the nature of
connected load ( Motor ), But motor has its own fixed Power
factor
Therefore Transformer and genrator capacity shown in KVA
and motor Capacity shows in KW........SO...if we want to
measure PF in GEN and TRAN...we require current and voltage
rating...so thier is in KVA....
but motor PF is constant so thier is no need to indiacte in
kva....so.......
Is This Answer Correct ? | 4 Yes | 4 No |
Answer / r.v.giribabu
To select a rating of any equipment, Output and Input
capacity is taken as a base point.
In a motor or any other electrical equipments, conductor
size is depend on current flowing through the conductor.
size of the core (Rotor and Stator or core of a
transformer) depends on voltage as flux induced in any AC
Machine is directly proprotional to Voltage/Frequency ratio.
Which culminates to Size of equipment directly depends on
Input/Output Voltage and Current of machine. that is why
rating is mentioned as Volatage X Current i.e. KVA.
Shortly, Size of machine is directly proportinal to KVA
ratring. that is why all the electro-magnetic machines are
rated in KVA.
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / subhajit
Power output of a motor depends upon the power factor . If
power factor is less it will affect the power consumption of
the motor from the supply mains.
Whereas in case of transformer, its output does not depend
upon power factor. So it is always rated in kva not kw.
Is This Answer Correct ? | 0 Yes | 1 No |
Transformer use step up or down the energy but not be use as
a load.
In case of motor work like a load
Is This Answer Correct ? | 1 Yes | 2 No |
List out the different frequency domain specifications?
how rated the neutral voltage of transformer and reactor, e.g. 400/220, 200MVA transformer have neutral voltage of 33kv. and reactor voltage 145kv. how this rating decided?
what is meant by class 1 E in electrical power supply?
which motor will u use in refinaries?
can a 50 Hz transformer work satisfactorily if placed under 60 Hz,what are the prices and losses that will arise
Where is the best place to mount distribution panel in a house.
0 Answers Wantro Technical Services,
kva/kvr
What are the factors to be considered during the Synchronization?
why the carbon brushes are used heat created rotating parts in eiectricity
I NEED RRB CHENNAI (JE ELECTRICAL) QUESTION PAPER FOR LAST 5 YEAR AND I NEED RRB (JE ELECTRICAL) SYLLABUS.PLEASE SEND MY E-MAIL joo28_eee@yahoo.co.in
12 Answers DFM, Hindustan Unilever Limited, JE, Pace, RRB,
define the non synchoronism of synchoronous machine in general g or m??
how to change the load sharing between two synchronized identical alternators when both are running with Diesel engine? assume both are feeding to same feeder?