why are maintine power factor 0.99 in Eb line? why are used capacitor bank in Eb line? what is the purpose capacitor bank?

4 Answers   TNEB Tamil Nadu Electricity Board,

---

What happent when a AC motor(no break and starters ) stop and suddenly start . ? Starting current low or high?? Why?

1 Answers  

---

One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

---

why core losses and copper losses does not depend on power factor?

5 Answers  

---

why ac signals are sinosuidal

2 Answers  

---

what are the reasons for overheating in electrical machines?

3 Answers  

---

What do you mean by lighting transformer?

0 Answers  

---

what will happen if we directly give supply to rotor of a induction motor?

1 Answers  

---

TO operate transformers in parallel, vector symbol of the both should be same.If one transformer name plate is not there, how can we conclude that whether the transformer is having the same vector symbol or not?

4 Answers  

---

For DG or Transformer body earthing, is it necessary to terminate the earth bus to earth pit directly? If not terminated to earth pit directly in earth pit and connected to any common bus strip which ultimately connects to earth pit, what will be the pros and cons?

1 Answers  

---

can a synchronous motor be made to rotate in a clockwise direction ?

1 Answers  

---

what is formula for calculate thermal overload in new numiricalrelay( not in bimetal relay)?

0 Answers  

---