Answer / kashifhabib

Efficiency = (Output/Input)*100
&
Output (KW)= KVA * Power Factor
Input = Output + Iron losses + Copper losses
Iron losses are due to Primary voltage so remains constant
can be calculated by open circuit test
Copper losses are due to secondary current I*I*R
can be calculated by short circuit test
Exp: Full load copper losses 800 W
1/2 load copper losses will be 200 watts

Answer / vinod parasa

Efficiency = (Output/Input)*100
output=(x)(KVA * Power Factor)
input=(x)(KVA * Power Factor)+(X)^2 copperlosses+core losses

the volue of x depend on load
x=1 for full load
x=0.75 for (3/4)th load
x=0.5 for half load
x=0.25 for quarter load

copper losses are variable losses and iron losses are
constant losses.

at the time of full load copperlosses=iron losse
Full load copper losses 800 W
half load copper losses=(X)^2 copperlosses
x=0.5 for half load
=(0.5)^2 *400
=0.25*400
half load copper losses=200

Answer / n.makali

POWER Transformer is 55MVA, 27/11.5KV ,efficiency =99.49

Find the Losses of Transformer

Answer / s.ravi

Efficiency =
(Output/Output+Iron losses+Copper losses)*100
Iron losses = No load test,
Copper losses = Short circuit test
Regulation = (Impedance voltage/Rated input voltage)*100
Impedance voltage = Short circuit test(Voltage drop)

Answer / prof dr lehaz kakakhel

go for two tests
open and short circuits tests
From the open, u compute the core power loss and from the
short, u get copper losses. then the formula is
efficiency = output/ (output + the above two losses)
SIMPLE

Answer / ranag

repaired a 200 kva three phase distribution transformer his stander iron losses is 495 & copper losses is 3410 but the measured iron losses is 692 what formula is to know de-rated in kva ? pl answer with expal

write a c++ code that receives an integer number and display the sum of the number and its revers integer?

0 Answers   MIT,

cany anyone suggest electrical wesites for providing study materials?

0 Answers  

A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?

0 Answers  

how to carried out tan delta test in 11 KV alternator ?

0 Answers  

Why the transformers are rated in kva?

11 Answers   Birla, NTPC, Reddy Labs, Vijai Electricals,

how to convert 1 phase power to 3phase power by using induction motor. . . .

1 Answers   BK Anand,

WHAT IS EDDY CURRENT LOSSES AND SKIN EFFECT LOSSES IN ELECTRICAL ENGINEERING

1 Answers   GAS,

Why Water motor is not taking a load or pressure while everything is correct. (Note: Motor running properly)

0 Answers  

why ohms law does not obey semi-conducters?

2 Answers  

How to calculate cable size in sq units based on motor rating is KW

2 Answers  

if we going for high voltage usages what are the considering factors, why those factors are effected.... please give me an answer related motor factors like wnidnig, frame, temp etc

1 Answers   ABB,

What is the formula to find out cross sectional area of cable for certain current rating?

1 Answers   MRF,