why are transformers rated in KVA and not in KW
Answer Posted / osman mehmetukaj
because to remain constant power transformer
while only changing currents and tension in the primary and
the secondary opposite, for example: Ip X Up =Is x Us =S
S(=)kVA
| Is This Answer Correct ? | 3 Yes | 7 No |
Post New Answer View All Answers
Is there any type of starter for DC motor other than two point,Three point and Four point starters?
what is the maximum permissible limit value of leakage current and leakage counter reading to replace lightining arrester?
1)we have 1000 cfm Blower,Dia-1Mtr,Velocity of air 94 m/s 2)We have Natural Air velocity 94m/s 3If i Put Wind Mill in natural air ,speed is 94m/s Then it will generate Assume 100kw 4)If i put same wind mill across the Blower,air speed is same 94m/s now the Question is Will it generate 100 kw?
can someone explain that how the speed of the protection system affects the fault level calculation?
DEFINE BREAKING CAPACITY OF BUSBAR & HOW IT IS CALCULATED?
Explain what is use of lockout relay in ht voltage?
What happen if 200 KVAR capacitor connected to power continuesly?
Please give me a erda placement paper
Please brief me about number of pole in alternator.In single phase alternator coils are connected in star or series. How to calculate frequency for the same.
What is the Surge suppresor? Why using in a UDB's and How it works?
what is the affect of earth's magnetic field on the frequency used in aircraft???
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
what is the difference between neutral and earth
what is the method of earthing of a transformer using electrodes?
What are IR values and what it should be for coil and for insulator