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

How to test lightning Arrester?

0 Answers  

---

Determine a suitable number of slors and conductors per slot for the starter 1 winding of a 3 phase, 3300 V. SO Hz 300 rpm alternator. The diameter is 2.3 m

0 Answers  

---

What is the difference between online and offline UPS

1 Answers  

---

Hi frnds :) plz tell me that i have 100 KVA 3 phase generator so by thumb rule 100*1.4 = 144 amps and generaly we can operate at 80% load...so it will 144*0.8 =112 amps.... so now i m confused about single phase load.....if we use that generator only for single phase the that 112 amps is total single phase load or i can give 112 amps at red 112 amps at yellow and 112 amps at blue.... i mean that total single phase load that 100 KVA generator will take is 112+112+112=336 amp ??

2 Answers   FWO,

---

why dc series motors never start without some load, and what will happen if starting with out load..

1 Answers  

---

how to measure the transformer resistance values(dyn11)?and howmuch the minimum value?

0 Answers  

---

when voltage gets down the current of motor increases. but according to Ohm's law voltage is directly proportional to current. plz explain

4 Answers   Maruti Suzuki, TATA,

---

3- What is the target from Zero Impedance, Single Phase Imp., S/C Imp. and magnetic balance tests?

0 Answers  

---

How to determine earth fault level to set relay for a normal distribution system of 11 kV , 100 A load????????

1 Answers   TCS,

---

HOW WE CHOOSE EARTH'S POTENTIAL AS ZERO V?

0 Answers  

---

Sir, why generating power plant operating at above 0.9 lag? detail explaination?

1 Answers   Kirloskar, L&T,

---

what are factors comes under relay setting (distance relay 7sa52) under OPEN DELTA VTs connection??

0 Answers  

---