Answer / raju

VCB means Vacuum circuit breaker Arc queching done in
Vacuum. SF6 breaker Arc queching done in SF6 Gas. And VCB
used for 11 KV to 33 kv but SF6 Breaker used from 33 KV to
400 KV.

Answer / masoom raza

Simple vcb uses vacuum as arc extinguish medium where as sf6 cb uses sf6 gas as arc extinguish medium.

Answer / kunjan singh

VCB can be used for upto 33 KV ,due to difficulty in
maintaining the vacuum inside a VCB at higher voltage,,and
also ,there are some size limitations...nowadays,at all
voltage level we can use SF6 CB having pressure of 5 to 6.5
kg/cm2..

Answer / karthik_elec

vcb: its produce the vacuum during the on off and fault
duriations. this vacum eliminate the arc between the
contact points.
sf6: its pass the sulfer hexa floride gas during the on off
and fault duriations, the pressure of the sf6 gas inside
the circuit breker is 5 to 7 kg/cm2. it will vary the
operating voltage of the sf6 CB

Answer / jayakumar v

VCB MEANS VACUUM CIRCUIT BREAKER 11 TO 33 KV IS APPLICABLE.
INSIDE OF THE BREAKER HAVING AN ONE VACUUM INTERRUPTER WITH CONTACTS. HERE VACUUM IS AN ARC QUENCHING MEDIUM. INSIDE OF INTERRUPTER VACUUM HAS BEEN CREATED BY MECHANICALLY (MANUAL) OR ELECTRICALLY(THROUGH DC MOTOR).

SF6 BREAKER MEANS SULPHURHEXA FLUORIDE BREAKER. IN UPPER SIDE OF THE BREAKER HAVING AN GAS POLE ASSEMBLY. INSIDE OF THE POLE ASSEMBLY HAVING AN MALE & FEMALE CONTACTS. ALWAYS MAINTAINING 3.8 Kpa PRESSURE INSIDE OF POLE FOR 33 KV LINE.THIS BREAKER RANGES UPTO 750KV.

Answer / umashankar

AS we know VCB can use 11KV to 33KV where SF6 use 33KV to 400KV, also safety are more as comparing SF6 higher then VCB.
If VCB blast that damage more where sf6 not damage more for its SF6 gas.

Answer / namit

All answers is Yes as my knowledge.

Which type of air compressor is used now a days in the market. Keeping in mind of energy efficiency and maintenance points. Relevant documents may also be sent on mentioned email ids.

0 Answers   DAE,

What is mean by % impedance of transformer? detail explanations expected.

1 Answers   FCUK,

what is the minimum distance between substation wall and LT panel outer surface?

3 Answers   L&T,

why do we generate sinusoidal ac?can we generate some other waveforms by alternators?

11 Answers   Siemens,

In separately excited m/c,we excite the field by a dc source,what not with ac source?

1 Answers  

how power trnafor from 1 point to another point in bus bar ya transmission line( voltage trnasfer from 1 point to another poin)

0 Answers   Suzlon,

What are the causes of motor vibration?

3 Answers   Equate,

differentiate between c curve and d curve MCBS?

1 Answers  

Difference between induction motor and synchronous motor? i Think Synchronous motors operate at synchronous speed (RPM=120f/p) while induction motors operate at less than synchronous speed (RPM=120f/p – slip). Slip is nearly zero at zero load torque and increases as load torque increases am a right pls guide & send Other Comments

5 Answers   Jindal,

what is difrent between earthing and ground

4 Answers  

should dc supply will give the transformer to build up the voltage level

1 Answers  

why do the core of transformer saturates???

1 Answers