Answer / tariq

The above answer is correct but at some extent. The
connection is switched from Star to Delta when motor
attained it 70~80 percent speed of its full speed. The time
of attaining this speed is counted and the timer is adjusted
accordingly

Answer / dhanesh

It depends on the motor rating. Big motor requires more time
to achieve the rated rpm so the timer can be set to 10-15
sec while for small motors (upto 50HP) it can set to 8-10 sec.

Can i get some examples of mechanical devices?

1 Answers  

---

Dear All we are having a problem in G120 BOP showing alarm A0503, F0052, F0060 we can not remove fault alarm ,Please any body help us. kowsar

0 Answers   TCCL,

---

why trasformer rated in kva why should have to maintain pf in our site 0.9

3 Answers   Dalkia,

---

why single phase to grd test in HV cable?why not 2 phase at a time?

1 Answers  

---

while doing the excitation current test on power transformer what is the value of voltage to be applied? Nomonal rated voltage or 10% of rated voltage? Is it necessary to apply on high voltage side?

1 Answers   ACC,

---

what is the diffrantial relay???????why we use it on the MDB

5 Answers  

---

How can we choose the rating of submersible motors

1 Answers  

---

from which subjects most of the technical que will b asked for hpcl(electrical).pls help me

1 Answers   ABB, HPCL,

---

what instruments used for measuring of inductance and capacitance.

2 Answers  

---

what is droop?

13 Answers   Alstom, Bhel,

---

what is neutral voltage

3 Answers   Power Grid,

---

Please elaborate th´evenin’s theorem?

1 Answers  

---