Answer / amit rajak

It is because it has very good arc extinguishing properties.
and which helps it to extinguish arc more rapidly. even arc
takes place in them only at very high voltages as vaccum
medium does not allow arc to take place.

advantages of VCB over OCB.
1.GOOD MAKING AND BRAKING CAPACITY
2.DOES NOT ALLOW ARC TO TAKE PLACE AT LOW VOLTAGES.
3.LOW MAINTENACE
4.FUEL REGULATION IS NOT NEEDED AS IN OIL CB.
4.CAN USED AT ALL VOLTAGES.
5.EFFICIENT ARC INTERRUPTION CAPACITY

Answer / sithi

arc extinguish is more fastly than OCB

Is it necessary to install Lighting Arrester on both side side (i.e HT and LT) of Transformer in a transmission substation? if yes Why on both side?

1 Answers  

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0 Answers  

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how we can classify the circuit braker???????

1 Answers  

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Describe Non I.S. Earth System and why is it used?

0 Answers   KPJV,

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0 Answers   Megatron Solutions, TCL,

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Hi, I've just got into my electrical engineering course and I need some help with a question of mine here. During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz. From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.

2 Answers  

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what may the reason for vector shift in a generator?

0 Answers  

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hai friends i have BSNL JTO exam on next month so if any body have model question paper or give preparation tips to my mail id kumar4486@yahoo.co.in this will helpfull for my future .plz & thank u by kumar

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what is the defination of 'Mass' & 'Weight'

3 Answers  

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In the market there is availability of MCCB & ACB (800A), So, Where i can use MCCB & ACB for the same Rating?

1 Answers  

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what is sevice settings for mccb?How can be it setted?

1 Answers  

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What is a soft start?

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