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.

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.

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.

Answer / jobmonjacob

Vacuum restriction.

Answer / jobmon jacob

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

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.

We have Diesel generator of 200KW but load connected to it only 100KW. Pl. brief me about fuel consumption.

4 Answers   ARDE,

What is the usega of brking resistor? and how it will useful to Drive...?

3 Answers  

what happen if transformer neutral not earth

2 Answers  

We have laid the single core Armoured cable 7 nos ( 2 each phase & 1 neutral ) to cater our electrical load . the issue is though we have Glanded the cable both the end also givan the earthing to the panel both the end we are facing a heavy sparking at the gland side. what could be the reason.

12 Answers  

hello! sir i did three year of diploma in electrical (2007- 2010) and now i m a student of electrical engineering. sir can i apply for germany visa for study and part tome work over there?

0 Answers  

How to select the rating of the Transformer?

2 Answers  

what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load

0 Answers   Tata Power,

what perpos use cepacitors in motars,fans,lights,and LT panal

1 Answers  

can we individually produce electriciyt

1 Answers  

corona happens more in summer or winter?

3 Answers   MAHINDRA,

1.what is the difference between MPCB and MCB ? 2.what is the difference between MPCB and MCCB ?

6 Answers  

difference between microprocesser and microcontroler

1 Answers   HAL,