Answer / rk

losses in transformer are 1) core loss2) copper loss
copper loss is proportional to current . the resistance of the copper changes with temperature. approximately it is 1.2 times at 85 degree celcius as compared to 40 degree ambient.so
total power consumed by the transformer during no load conditon can be read from the wattmeter connected in the primarry. this will give the core loss which varies with the loading of transformer insignificatly lets say 1000W.

now if transformer is distribution type or generation type.

maximum efficiency is when core loss = copper loss

so total loss at 50% loading is 2000w
copper loss at 100% load will be approx 4*1.2*1000=4800w( 4 due to doubling of current , copper resistance almost increases by 20% from 40 to 85 degree celsius rise


so total loss at 100% load = 1000+4800w=5800w

What is the over speed in turbine? What is critical speed?

3 Answers  

---

what is block out in thermal power plant?

3 Answers   SECL,

---

What is critical speed of turbine

6 Answers   Vasavi Power,

---

By any way can we increase the B check hours from 300 to 500

0 Answers  

---

why oil filled transformers will be with explosion and fire often?

1 Answers  

---

During shutdown of Steam Turbine,How do we cross the critical speed?

7 Answers   OPG, Power,

---

What is LB-SR.

0 Answers  

---

I am opertaing generators which are beyond 14000hrs and now the fuel consumption is about 2kw per liter of diesel. The engines are due for overhauling. is this normal

1 Answers  

---

Why attemperation is required in HRSG in a combined cycle power plant?

10 Answers   Tata Power,

---

What will happen if the Air Preheater is placed before the Economiser?

6 Answers   Bhel, KSPL, Tata Power,

---

By seeing a Power house Can we justify the kV of that power house?

1 Answers  

---

Qatar Fertiliser Company (QAFCO) Shortlisted me for interview (got the intel from my source) for Field Operator- Utilities post. Please let me know what kind of questions they asked? ... this position requires 5 years of experience in Power Plant and background Diploma in Electrical/ Mech. ... my Background is Electrical and I am a sub Assistant Engineer (Operation) at a private HFO based Power plant... PS: Please Let me know what preparation should I take to obtain the Interview which will be take place In Bangladesh soon

0 Answers  

---