Answer / ahmed rahman

in this connections for over current protection,i have a strange theoretical question.
we all see the common wire of the cts secondaries.
in this wire , the 3 currents of the 3 phase pass through it,
i want to know how each current goes back to it's ct without going to another one however it has a way to pass through !
..the second part of my question,,this earth connection also to the secondaries of the cts, why the current doesn't pass through it?? what prevents it? it acts as a short circuit to the earth !!!

http://www.electrical4u.com/images/backup-protection01.gif


http://www.sayedsaad.com/montada/attachment.php?attachmentid=125929

what is mean by hormonics & surge? and it's effects?

1 Answers   TCS,

---

12.5 KVAR capacitor 440V gas filled, Its used for windmill purpose, How can i know about microfarad value for this capacitor

2 Answers  

---

1 KW = how many HP

3 Answers  

---

what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?

0 Answers   Bhel,

---

what is physical distance of isolator to VCB in 33/11kv sub stations

0 Answers   Enercon,

---

how to detect the presence of underground cable(while digging road)etc. -give the name of instrument

7 Answers   NTPC,

---

what is the difference between the characteristics of two different phase bushing of any transformer

0 Answers   NIT,

---

Explain the advantages of the wheatstone bridge method of measuring resistance?

7 Answers  

---

why capacitor burst?

2 Answers  

---

what transformer we used normally and upto which kva?

0 Answers  

---

What kind of battries are generaly used with Disel Generator?

1 Answers   Exide,

---

6 MVA transformer secondary is rated for 725V at no load. The incommer ACB is rated at 690 V, 3200 Amp. Would there be any effect on performance of ACB due to lower voltage rating?

5 Answers  

---