why using earth testing rod 15 meter 30 meter long to each other?

1 Answers  

---

how to ctrl motor by use of ac or dc drive.plz explain evdintly

0 Answers  

---

hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?

0 Answers  

---

An 11kv system consisting of an underground cable to a sub station about 300 meters away was shut down for about 10 hrs. On energising, it tripped off on earth fault about 10---20 mins later 6 times but since than it is not tripping.its already 3 weeks now. The SPAJ was found to be fine. what could be the cause.No test had been done to determine the cause of the trippings till now because of demand.

2 Answers  

---

what happends when an isolater is operated on on-load

1 Answers  

---

---

can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?

0 Answers   RD Square,

---

what are the analog quality input for protection function?what are minimum reqiments?

0 Answers  

---

why the transformer primary and secondary windins vector groups vary? why it is something like Dy11 and not as Dy or Yy...

2 Answers  

---

In three phase supply why we use R Y B Colour not other.

4 Answers  

---

how can we solve the RMS value of alternative Qnty is .707 , explain detail .

2 Answers  

---

how much test voltage should applied for tan delta test.

2 Answers   Electrical, TATA,

---

Is earthing done for AC or DC or both?

6 Answers  

---