why VCB are not used in 132KV system(above 33KV system)




Answers were Sorted based on User's Feedback



why VCB are not used in 132KV system(above 33KV system)..

Answer / nihar ranjan mandal

Amount of vacuum required to quench the arc at 132 KV level
will be very high. It is difficult to maintain that amount
of vacuum in practical purpose. Now a days we use GIS( gas
insulated substation for 132KV level. Where arc is quenched
in hydrogen chamber.

Is This Answer Correct ?    11 Yes 1 No

why VCB are not used in 132KV system(above 33KV system)..

Answer / karunakar

Ionisation at higher voltages causes arcing between breaker
contacts hence deteoriation of contactors. This raises
another methods for arc quenching.. so for medium voltages
currents upto 3000A VCB's have longer life and better
operability.

Is This Answer Correct ?    6 Yes 2 No

why VCB are not used in 132KV system(above 33KV system)..

Answer / deepak jha

Degree of Vacuum required for quenching of ARC at 132 kV
level system fault is very high and its very difficult to
maintain that much degree of Vacuum so don't use VCB in 132
kV level. we generally used SF6 for this purpose.

Is This Answer Correct ?    2 Yes 0 No




why VCB are not used in 132KV system(above 33KV system)..

Answer / jobmonjacob

Vacuum restriction.

Is This Answer Correct ?    0 Yes 0 No

why VCB are not used in 132KV system(above 33KV system)..

Answer / jobmon jacob

Factors contributing to interuptor selection are 1)voltage
2)metallurgy 3)vacuum 4)size 5)sc rating6)current chopping etc.

Is This Answer Correct ?    0 Yes 0 No

why VCB are not used in 132KV system(above 33KV system)..

Answer / raghu

In 132kv and above switch gear required very high vacuum to quenching arc during making/breaking the contacts, now a days we r using gas insulated and sf6 switch gears for proper operation.

Is This Answer Correct ?    0 Yes 0 No

Post New Answer



More Electrical Engineering Interview Questions

Whether the Dc motor Droping the power factor like AC motor if lot of motor running in factory is it necessary to connect capacitor bank

2 Answers  


Advantage of LT panel vs HT panel

0 Answers  


What is mean by spike arrester(Voltage Operated)

0 Answers   Siemens,


What are the tests to be taken on a transformer and generator?

12 Answers   Honeywell,


why starter use to on a motor

6 Answers   Emco,






´╗┐Due to velocity saturation, MOSFET reaches saturation a.Before Pinch off b. After pinch off c. At Q point d. Before Q point e. After Q point

0 Answers  


what is the differences between single phase ind. motor and three phase ind.motor?

3 Answers  


technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"

0 Answers   Wipro,


I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  


Ferranti Effect says that voltage at the receiving end is higher than that at the sending end. How is it possible?

4 Answers  


what is ratio test?

1 Answers  


If u have Powergrid model question papers Please send to below mail ID rajutheprince@gmail.com

0 Answers  






Categories
  • Civil Engineering Interview Questions Civil Engineering (4622)
  • Mechanical Engineering Interview Questions Mechanical Engineering (3695)
  • Electrical Engineering Interview Questions Electrical Engineering (15736)
  • Electronics Communications Interview Questions Electronics Communications (2633)
  • Chemical Engineering Interview Questions Chemical Engineering (761)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (79)
  • Bio Engineering Interview Questions Bio Engineering (30)
  • Metallurgy Interview Questions Metallurgy (95)
  • Industrial Engineering Interview Questions Industrial Engineering (199)
  • Instrumentation Interview Questions Instrumentation (2868)
  • Automobile Engineering Interview Questions Automobile Engineering (171)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (41)
  • Marine Engineering Interview Questions Marine Engineering (60)
  • Power Plant Engineering Interview Questions Power Plant Engineering (168)
  • Engineering AllOther Interview Questions Engineering AllOther (1331)