Answer / n rajesh(zuari)

Transformer and generators rating in KVA due to this is not
depended on power factor.Motors current depended on copper
losses and voltage depended on iron losses so, this is
depend on power factor.

Answer / swum

2 types of losses in transformer are
Ohmic loss which is dependent on current
core loss which is dependent on voltage
Since these 2 losses are independent of power factor, rating
is expressed in KVA instead of KW

Answer / g a reddy, essar steels ltd, v

The term power factor is related to load. It is not related to Generator and Transformer. I mean Power factor angle will not vary with out load.(cos of the angle between voltage and current.) This will vary depends on type of load.I can say capacitive loads will inject the reactive powers to line and inductive loads will draw reactive power(KVAR) from the line to develop a magnetic field in the windings.Active power is used to Drive the load(KW).
KVA= sqrt of(kw2+kvar2)
And also we can say Transformer and Generators Losses will depends on Voltage and current. So Ratings of these are mentioned in VA.

Answer / muthuvel

Actually Dg and Transformer Supplying Apparent power only . At the load point only power is segregated by real and reactive power.The Apparent power measured by the unit of kVA(Kilo Volt Ampere),the True power measured by the unit of KW,the reactive power measured by the unit of kVAR(Kilo volt ampere with reactive component).For that reason only DG and Transformer ratings are in KVA.

WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.

0 Answers  

---

what is the significant for using two types of voltage(line voltage & phase voltage)

1 Answers   NTPC,

---

suppose there is afault in transmission line connected to a generating station, then what r the adjustments u will take to without loss of synchronism?????

2 Answers   NTPC,

---

What are the relays in ACB and VCB

0 Answers   ABB, Bhel,

---

Why should not we run the IM in low voltage, if runs means what will happen?(for example instead of 400V we give 250V supply)

2 Answers  

---

why do we use 25kv supply for traction purpose?

0 Answers   Bhel,

---

Why we are getting low voltage in star connection?

2 Answers  

---

What is meant by Resonance what are the different types of resonance and what are uses of them?

14 Answers   Infosys, NTPC,

---

if current required for triggering thyristor at -30 degrees(temp) is 80 mA, what is the current required at 60 degrees

1 Answers  

---

How many types Switchgears?

4 Answers  

---

What is the value of system voltage?

2 Answers   Bhel,

---

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,

---