Answer / arvind arora

ratings are depand upon heating.in transformer heating is
due to coreloss whitch is depands on voltage and copper
loss whitch is depands on currrent.losses do not depands on
pf. for example a x'mer working on rated voltage and rated
current with load pf equals to zero has rated losses and
rated kva output.so thats why its rating is in kva.

Answer / siva

due losses are in kva

Answer / william lobo

All transformers are rated in KVA or MVA if they are big
size. This is because it has a particular capacity and we
cannot utilise beyond this capacity. suppose you have
100KVA transformer; then you cannot use more than 100kva
capacity. If you do either transformer will burnt out or
the circuit breaker will trip.

how to calculate the voltage drop in electrical cable while laying cables?

2 Answers  

---

if reactive power become zero in transmission system then what effect on system.???

3 Answers   Sedemac,

---

what will happen if the secondary of current transformer kept open....

11 Answers  

---

can we use 220 volt 15 w a.c. lamp on 220 volt d.c.

11 Answers   Philips,

---

what are the advantages disadvantages of connecting high voltage block( 1:1 transformers) transformers between the turbo generators and busbars.

0 Answers   Bajaj,

---

why transformer not work in dc

16 Answers  

---

How can we calculate the rating of a cable with formula?

2 Answers   TATA,

---

why core losses and copper losses does not depend on power factor?

5 Answers  

---

name the famous power plants present in A.P

1 Answers   Power Grid,

---

What is the difference between ELCB and RCCB. Please define the working of both.

6 Answers  

---

How to discuss the phase shift of transformer considering open delta?

0 Answers  

---

Why does the DC voltage needed is less than AC needed to produce corona?

2 Answers   TATA,

---