Answer / iamdon

In ACB(Air Circuit Breaker) arc extinguishing and
insulating is carried out in air medium where as in VCB
(Vaccum Circuit Breaker)it is carried out in low vaccum.
At high voltages, air inonises and losses its dieectric
properties which makes the ACB unsuitable at HT.Thats why
ACB is used at LT not at HT.

Vaccum can suastain high voltage(not ionises) and does not
losses its dielectric properties which makes the VCB
suitable for HT.

Since VCB is costlier and require more maintenance as
compared to ACB.So VCB is not employed for LT where cheaper
option as ACB is available.

Author:arbelectbit@yahoo.com

battery capacity use of made?

0 Answers   JLL, Shankar Electricals,

---

what is meant by leakage current of a capacitor?

1 Answers  

---

Why we use mostly circular coil in transformer? not square or rectangular type of coil.

4 Answers  

---

What the main causes of transient interruptions on Over-Head Distribution Lines?

0 Answers   Orion Laboratories,

---

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

---

L&T ACB C-POWER OF 800A FAULS TRIPING AT THE TIME OF 110KW MOTOR STARTS WITH EARTH FAULT RELEASE

1 Answers   Ambuja,

---

What loads the lagging and leading effects comes in a circuit?

5 Answers  

---

what is boucholz relay and the significance of it in to the transformer?

2 Answers  

---

how df/dt relay operates & how it works?

1 Answers  

---

Why the Potential transformer Primary in connected to Earth?

2 Answers  

---

As a good company employee, can you report your supervisor to the company management if he or she is going against the company interest in his or her actions?

3 Answers  

---

dear sir, i completed diploma in electrical in 2005, how i can get electrical supervisor liance in mumbai

0 Answers  

---