Answer / renish2905

Becuse of the fault current is very large and small time about 1 second or friction of second.in this time CB is activated nearly less than of second.and all about calcualtion to took fault current time 1sec for easy to calculation.

Answer / asivasankar2k

As per my view, All equipment made to withstand 1sec only

Answer / adnan

Fault current is too large, about 7 times the normal current. If this current flows for longer time, it will burn all the equipments. So, breakers are designed to operate in 0.3 sec, 0.5 sec time if fault is not cleared in this time.
So such large current, even 1 sec is too long time.

What is the voltage violating limit to be considered for load flow study? What is acceptable deviation limit according to relevant standards?

1 Answers  

---

Why we didn’t feel electric shock in an electric train ??

10 Answers   NTPC,

---

what is power factor? is it good or bad for a system? what will happen if power factor increase or decrease?

4 Answers   Bhel,

---

What is the difference between generator and alternator?

2 Answers  

---

In our generating power station we get electric shock in the battery bank, what will be the reason?

3 Answers  

---

---

What is the working principle of ceiling fan?

6 Answers   Indian Navy,

---

How do we find the rating of a transformer, if it got burnt badly.

0 Answers  

---

how does the harmonics enter into the induction motors?

1 Answers  

---

In motors how many types of cooling systems were used?

0 Answers   NTPC,

---

Where servomechanism is used?

0 Answers  

---

How to calculate multiplying factor of dc energy meter

0 Answers  

---

what is ELCB?

10 Answers   Wipro,

---