Answer Posted / sriram

This calculation Applicable for 3 phase fault.

Transformer:

Step 1:
First calculate Full load current
I(F.L)=(KVA*1000)/(V*1.732)
Step 2:
Calculate multiplier factor(M)=100/%Z

Step 3:
I(sc)=I(F.L)* M

Motor

Step 4:
F=(1.732*L*I(#phase))/(c*n*E(line-ground))
step 5:
M=(1/(1+F))
step 6:

I(s.c)sym rms=I(s.c)*M
I(s.c) MOTOR=4*I(s.c)

Total fault current =Is.c(trans)+Is.c(Motor)

HI SIR, AM PREPARING FOR RRB FOR SECTION ENGINEER POST. PLZ SEND ME THE PREVIOUS QUESTION PAPERS AND HELP ME. I HAVE NO ENOUGH TIME MY EXAM DATE IS 22ND JUNE.... MY EMAIL ID IS nalla.amarnath@gmail.com

2007

---

WHAT IS THE MEANING OF BALANCED / UNBALANCED IN STABILIZER TYPES.

2737

---

What is the basic principal, by which DC voltage level is increased more than the supplied AC voltage during conversion. As upto AC level it is contorrled by firing anlge but after maximum level how is it possible.Please clear picture. OR we have to supply the higher level AC?

2049

---

please send me the L&T Emb. sys. placement papers and entire details of pattren

2422

---

Sir, I have applied for the of Jr.engineer(Electrical & Electronics) & ASST. LOCO PILOT at ALL RRB BOARDS. please send me all RRB Boards solved papers in the year of 2001 tO till date. i requested send me the papers to my id as soon as possible (jet_0991@yahoo.com). (This is very urgent) Thank You,

1919

---

when will be the iocl interview results i faced interview on 8th september 2008 iam from electrical branch i faced interview for the post of electrical engineer??????????????????????//

2129

---

hello!my name is sheikh iam preparing for indian engineering servieces,please send me the old question papers..to sheikhshaazforjobs@gmail.com

2172

---

send me any model test paper of clerical post of state bank of india.......

1936

---

please send 5yearje solved papers on my email himmatsinghnathawat@gmail.com

2015

---

please send me latest & previous years question papers for IOCL Technical level questions

1958

---

please send the last 5 years {{{JUNIOR ENGINEER - ELECTICAL, ELECTRONICS RRB CHENNAI and secundrabad}}} TECHNICAL question papers TO MY EMAIL ID dinesh100701@gmail.com

2269

---

Define the overload capacity of the motor?

2143

---

If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?

2324

---

i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com

2093

---

What types of CMOS memories have you designed? What were their size? Speed? Configuration Process technology?

3781

---