Answer / rutulsoni

there is two types of losses occured in transformer which are copper loss and iron loss.Copper loss is always  measured in ampere and hysteris loss measured in voltage so its rating comes in KVA. 

Answer / ep

Transformer rating comes in KVA not in KW, because - there are two types of transformer losses (Copper losses and Iron losses). Copper loss depends on current and Iron/Core/Insulation losses depends on voltage. Hence, total losses are dependent on amp-volt (VA), not on phase angle between current and voltage. It means losses are independent of load power factor (cos phi).
That's why transformer rating comes in KVA not in KW

Answer / kothandaraman

Because of transformer there is no lagging and leading current vector with reference to voltage vector. PF means the cosine value of the angle difference between voltage vector and current vector. If current vector lags the voltage vector, it is lagging, for example inductance type of loads, i.e motor. If current vector leads the voltage vector, it is leading, for example capacitance type of loads, i.e. capacitors and synchronous motors.

Answer / sagar

the transformer rating is in KVA because manufacturer dont know the Load Power factor thats why they specified it in KVA which is nearly Permanant losses

why does connected a indutor with mnsformeretering core of current transformer ?

0 Answers  

---

What is ignitor and why it is use in Hpmv lamp ?

2 Answers  

---

why CERAMIC material is used in insulators??

1 Answers  

---

how to find out speed of single phase motor

6 Answers   BARC,

---

How to calculate flow of water delivered by pump when pressure & size of pipe line is given

0 Answers   Knight Frank,

---

---

If u take a kWh reading in 11 kV HT and 440 LV side at same time in yesterday today , then why LT consumed units 3-4℅ high as compared to HT units

1 Answers   Brigade,

---

Testing procedure of DG alternator stability test

0 Answers   Amprotec,

---

why rating of alternator in kva & induction motor in kw

9 Answers   Siemens,

---

How does a star connection and delta connection work? How does the star connection save starting current and how does it change to delta?

3 Answers  

---

what is doid

0 Answers  

---

explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.

0 Answers  

---

we erected (48HP)63kva dist transformer and incoming from 11kv line,out going is 415v domastic line 2.04 km.for that actual output current is 84A. what are the losses and final output current.

3 Answers   Essar,

---