Answer / pillay

As the name imply over current means over loading which can
be for a very short time like when switching on a heavy load
or just overloaded slightly by 10 or 20 %.

Short circuit faults are usually of high magnitude when
there is a fault like cable fault or equipment fault.

Answer / girish

over current zone lies between 100 to 400 times the machine
rated current,
but short circuit current zone lies above 400 times and may
extend upto 2000 times the normal rated current

Answer / mahesh katakdhond

overcurrent means just harm equipment slowaly (20to50percent greater than actual current)

shortcicuit means harm suddenly on equipment(it will some multipal value to actual current(4,5,6,7,....*actual current)

the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?

0 Answers  

---

In separately excited m/c,we excite the field by a dc source,what not with ac source?

1 Answers  

---

What is ELCB?

9 Answers   Bhel, CDS, IOCL,

---

Which of the following alternatives will be cheaper (1) A 100 h.p AC, 3-phase motor (2) Four motors of 25 h.p each (3) Five motors of 20 h.p each (4) 10 motors of 10 h.p each explain

0 Answers  

---

How many methods to take IR value of Current Transformer?

1 Answers  

---

what is the meaning of powerfactor

6 Answers   NTP,

---

what is the difference between core & shell type transformer ?& where we use those transformers ?

10 Answers   BNCET,

---

What are the major types of Curent Transformers?

2 Answers  

---

why induction motor take more current when motor start time and this current take for 1 hours when motor is start.

2 Answers  

---

What is partial discharge in power cable?

1 Answers  

---

If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

0 Answers  

---

what is the working principle of smoke detector in fire alarm system

2 Answers   Vijaya Bank,

---