Answer / meenakshi

tranformers are rated based on the losses.the two main
losses of a transformer are copper loss n iron loss.copper
loss occurs in transformer whenever it is loaded(full load,
half load or whatever the load may be).thus copper loss
depends on current.but iron loss are constant losses,which
vil always be present no matter the transformer is loaded
or not.thus the total losses of a transformer depends on
volt-ampere n not on the phase angle between them. i.e it
is independent of load power factor.

Answer / amit rajak

The transformer is rated in KVA because its efficiency
actully depends on its losses.

and it is known that there are two main types of losses
that occurs in transformer.

They are as follows.
1.iron losses oer hysterisis losses
or Electromagnetic losses
2.copper losses or eddy current losses.

1. iron losses- it generrally occurs at the
windings that is made of copper as conductor and are under
operation . at all the loads and are rated in current
losses.

2. voltage losses-these losses generally occours at
all the time whether at load or not load conditions

so it is clear that this to parameters current and voltage
decides the overall efficiency of the transformers.

and also as the transformers deals with the poiwer in kilos

so it is rated in kilo volt amperes

Answer / jameel

the design of windings of transformer depend on the voltage
and current that is meaning kva .
morover the transformer hasnot mechanical output load such
as motor to say the power in kw.
only we calclate iron losses and copper losses in kw.
also the power factor in windings changes according to the
loads which connection in the secondary windings
usually trasformer and generator rated power in kva but the
motor in kw which is the useful power or active power.

What is Lockout Relay and what is use of it in electrical installation

1 Answers  

---

what is JE exam?

0 Answers  

---

What is a system?

0 Answers  

---

What is the full form of PSD & CSD ?

6 Answers   NIFT, PNG Power, PSD,

---

state the construction of incondenscent lamp?

0 Answers  

---

---

please suggest some good universities with low cost iam in totally full confusion so please help me my profile gre 283 and ielts 5.5

0 Answers  

---

what is IP 55 & IP 54 ?

1 Answers  

---

WHERE IS THE LIGHTING ARRESTER SHOULD BE PLACED IN DISTRIBUTION LINES?

6 Answers   Bhel,

---

I have 2 transformers in two different plants, both are without OLTC but i am facing problem of voltage fluctuation at LV side from only one transformer. i have to change its taps manually twice in a day. Another transformer delivering voltage is ok. Please guide me about the problem

1 Answers  

---

What are the types of windings according to the construction?

0 Answers  

---

Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?

0 Answers  

---

why ht motor connection in star

10 Answers   Suzlon,

---