Answer / pradyumna chandra panda

By help of power trangle pf= value of cos thita (cos fi)=
b/h=active power/apparent power. Active power (kw)is the
real or true power which the transformer give for a
aparticular load (useed power)and Apparent power(kva)is the
supply power for that particular load. That a 100 kva
transformer can supply/give 100 kw resistive load and
incase inductive circuit a 100 kva rtransformer give 80 kw
inductive loadat at.8 pf,and 75 kw inductive load at.75 pf
etc but the pf of the load is not known before that which
types load (resistive,inductive or capacitive)to be
connected across the suplly, this is only why the
transformers and Alternaters are rated in kva and it is
meaningless discuss about iron loss & copper loss because
the UPS and inventers are also rated in kva.

Answer / praphulla bansal

KVA is mentioned to take care of PF issues of the load. At the same time, rating of transformer is given a limiting PF. This means a 100 KVA transformer and limit of 0.8 PF will limit load to 80 KW irrespective of load PF as unity.

Answer / md. abdullah al mamun

I think Copper loss of a transformer is related to current
and core losses are related to voltage so that VA should be
the rating of a transformer. But in a large transformer it
is rated it KVA. Also KVA rating Indicate the Maximum
Current Rating of a transformer with a rated voltage.

for a 500 KVA connected load, I calculated 30% of capactor for power correction. Even after using 225 KVR capactor PF is not improving. What could be reason for low Phase correction factor?

0 Answers   Power World,

---

why we used ZNO in Lightning arrester.

0 Answers  

---

is there any role of power factor with frequency variation? and how we can manage the frequency variation?

0 Answers   Wipro,

---

how oti and wti connections are different from each other?

0 Answers  

---

why there is no short circuit when any resistance is used between phase and neutral?

3 Answers  

---

---

what is the pperating squvance in transmission line for circuit braker, isolater & earthing switch.

2 Answers  

---

What is the permissible maximum flux density in transformer core?

0 Answers  

---

WHTA IS LIMT OF LEAKGE CURRENT OF 11 KV 1 CORE 1000SQ.MM. XLPE CABLE.LOAD ON CABLE IS AROUND 600AMP .LENGTH 500 MTRS.

0 Answers   L&T,

---

State Maximum Power Transfer theorem.

0 Answers   ABB,

---

What is the previous name of Cox's Bazar

0 Answers  

---

how we can check new PT ? without name plate.

1 Answers   Indo Power Projects,

---

how bucchos relay works in a transformer

8 Answers   Indeco,

---