why transformer capacity is called KVA and motor capacity
is called HP/KW?
Why transformer capacity cant call HP/KVA?
Answers were Sorted based on User's Feedback
Answer / satyanarayana
transforer losses are depends only voltage and curent .so
t/fs rating will be in VA or KVA. in rotating m/cs losses
depends on angle b/w voltage and current.so its rating in
kw or hp
Is This Answer Correct ? | 26 Yes | 1 No |
Transformer is a device which transform the power from its
primery to its secondary provided that the frequency and
power remains same (In ideal case the power will be same).
In transformer there is no changing of power factor so its
rating is described in VA.
But the motor is a device that converts the Electrical power
into Mechanical power. In motor applications we concerns
both with with electrical power as well as Mechanical power.
Kw is Electrical term and HP is usually used in Mechanical.
Hence this is the reason as per my knowledge.
Is This Answer Correct ? | 2 Yes | 2 No |
Answer / sachin
In trafo losses depend on V , A so rating in VA/KVA/MVA
While in motors losses are frction , rotor , stator cu
losses, etc and these losses are calculated in watts so
rating in HP/ KW
Is This Answer Correct ? | 0 Yes | 2 No |
Transformer is a static device(no moving parts). The voltage transmission is through mutual inductance(M=L.dI/dt). So losses in transformers are meaning less.So the Power in transformers are mentioned in VA or KVA or MVA.
But in motors are having moving parts. so the inductive coil(Rotor or field)have lagging power factor. The phase difference between voltage and current is called power factor.
The losses in motors are very high compared with transformers. So in motor, the power is noted as KW.
(Note: 1HP=746 Watt or 0.746 KW)
ersaravananp@gmail.com
Is This Answer Correct ? | 1 Yes | 6 No |
Answer / vijay yadav
open ckt. chracteristics of tranformer depends upon the open
ckt. voltage while the short ckt chracteristics depnds upon
the short ckt. current.Therefore to combined the effect of
both the chracteristics tranformerrating is done in KVA.
Is This Answer Correct ? | 2 Yes | 10 No |
Why two nos. un-tensioned wires are placed inside the PSC poles used by powergrid in RGGVY works.
'documenˁ
What is converter transformer? Diff b/w converter transformer and distribution transformer? why we use converter transformer in place of giving supply to drives?
An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm
what is the function of NAT & NAC contacts in breaker control switch (TNC)??
what is the purpose of silicon dropper used in battery charger?
Describe the control mechanism of missile launcher???
what may the reason for vector shift in a generator?
rrb question
single phase brower fan with control starter. *problem is when operate it.It will be trip.
We have given to 3phase supply to ups system & how can coming netural
What are the commonly used schemes for the bus zone protection?