Answer / sidharth

The pf is maintained at 0.8 because generator has to supply reactive power to the connected transmission line if pf is maintained at 1 then the distribution transformers would not be energized as it requires some reactive power for its core to produce magnetic flux.Also the due to line capacitance the receiving end voltages will get higher than the sending end voltages. For more reference consult reactive power control topic.

Answer / lokeshraj

We use the capacitor bank to maintain the power factor at .8 when it goes below this value, capacitor compensate the reactive power needed, and improves the power factor. Why don't we use this much value of capacitor that the pf becomes unity. Because if we use the capacitor at the load end and makes the pf unity the losses in the line will be decreased and the load capacity of the line will be increased.
Only in unloaded or lightly loaded condition the receiving end voltage of the line becomes higher than the sending end voltage.

Answer / mintuk1@gmail.com

For transmitting power with low value of ferrenty effect .power generating station pf should kept 0.85 -0.80

Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

---

If i have 200 test cases and we have to execute but we don't have time to execute all testcases.within 1 hour we have to execute that testcases and prepare the test report.so how i have to resolve this problem? is there is any technique in the testing.

3 Answers   Stag Computers,

---

what is the working of air compressor.

5 Answers  

---

what is the function of avr when synchronous generator act as synchronous motor

1 Answers  

---

which model T or pie model is prefarable in power syatem

0 Answers  

---

Can a 50-Hz designed transformer be used at 60-Hz system? Is the same remains true, when a 60-Hz designed transformer be used at 50-Hz system? Consider only frequency variation. The voltage remains as rated value in all cases. Justify the answer.

2 Answers  

---

Grid fault level [KA]?

0 Answers  

---

can we conduct the swineburne's test on a dc series motor? why?

0 Answers  

---

is dc shunt moter oprate on ac? if no why? if yes how?

8 Answers   IOCL, JJJ, Power Grid,

---

What is electrical cable termination

0 Answers   Gulf,

---

what are the various types of earthing? plz give brief detail of all. also post pictures if u have.

22 Answers   Aster Teleservices, Era Infra Engineering, Micron Electricals,

---

Hi,I am working in abroad for more than 3 years in a company operating with 11kv and 6.4 MW power. I need c licence in India,can I? some other says only i can get if i work for 2 years in india only! anybody kindly clarify by doubt.Thanks

0 Answers  

---