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

why is the HT voltages are in multiples of 11KV

1 Answers   Clariant,

---

what is the differnce between high impedance relay and low impedance relay

4 Answers   Areva,

---

STATE USE OF ARC RUNNERS & SPLITTERS ?

0 Answers  

---

how to testing the AC 3 phase motor? and what is the test procedure & kits required for testing?

3 Answers  

---

1. how much normal earth resistance in earth pits(neutral and body earth) and transformer neutral and body earth & panel earth.

12 Answers   HP, Malladi Drugs and Pharmaceuticals, Pearl Engineering, PL,

---

HOW many type of Circut Breaker in the world used in 400 kv substation?

14 Answers   Power Grid,

---

what is working of Master trip relay ?

9 Answers  

---

which surface is suitable for NEUTRAL GROUNDING ?

1 Answers   NTPC,

---

How to calculate Number of Earthing Pits....???

0 Answers  

---

What is best method of Calculating Short Circuit current in power system network.

1 Answers  

---

In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?

0 Answers  

---

how to failure indution motor insulation & how to improve heat in motor insulation

0 Answers   BHL, EPIL, IFFCO, Micromax,

---