Answer / prakash gokhale

While opening and closing the breaker the arc occures
between the contacts of the breaker. To resist the arc and
to protect contacts some arc quenching medium is used. In
ACB air and in VCB vaccume is used as arc quenching medium.

Answer / mohammad farman khan

While opening and closing the breaker the arc occures
between the contacts of the breaker. To resist the arc and
to protect contacts some arc quenching medium is used. In
ACB air and in VCB vaccume is used as arc quenching medium.

VCB= VACUUM CIRCUIT BREAKER and use for medium voltage
RATING 630A to 1250 A

ACB= Air circuit Breaker and use for LV side from 1600A to
3200A.

why do we provide metallic enclosure to bus duct and then ground it?

1 Answers  

---

How to calculate the Airconditioner capacity for a standard telecom BTS shelter?

3 Answers  

---

i have a 4 Mva transformer 34.5 kv / 480-277 v and i used 2 parallel 3200 amp bus duct for the secondary feeder using 3 ply of bus bar ( 3/8" x 5" ) as a common where the flexible link terminated and 6300 amps breaker for the main, the lower bus duct reaches 70 degrees and the upper bus duct reaches 55 degrees when i used thermal scanner. why the temperature is not balance when the load reaches 3600 amps.

0 Answers   SCM,

---

what is plunger and what's the use of it in motor alignment?

0 Answers   CLZ, Yahoo,

---

what is the principle of operation of domestic fan?? what is the role of capacitor in it??

5 Answers  

---

wht factor are considered to design ACB( air Circuit reaker) 415V

3 Answers  

---

working of a diesel generator.

34 Answers   ABC, AC, Cognizant, CTS, Directorate of Lighthouses and Lightships, KSL, Quippo, Shree Renuka Sugars, SRF, Svam Power, Tech Mahindra,

---

why link is provided in neutral of an ac circuit and fuse in phase of ac circuit?

4 Answers  

---

Why the starting current in Induction Motor is very high as compared to normal rated current ????

6 Answers   Essar,

---

If Ac supply is given to the DC motor then what will happen? clear explanation

2 Answers  

---

what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?

0 Answers  

---

What will be the current after disconecting the bus bar or cable before discharging ?

2 Answers   Sodexo,

---