- Which type of cb used for 11 Kv feeder?
- What is the difference between Electrical engineering and electronics engineering ?
- How can test the quality of house earth without any device ?
- Main difference between dielectric and Insulator?
- How many earthing will be provided for power transformer?
Vacuum circuit breaker
Ans:Electrical engineering main concern is use of electrical energy for transmission and conversion of power.
Electronics engineers main concern is use of electrical energy for transmission of information.
By connecting a bulb between phase and earth pit(point) and checking the brightness .
Ans:Dielectric is polarised and insulator are not
All dielectric are insulator but insulators may not be dielectric
Dielectric can store charge insulator are not
Ans:Earth for lighting ,arrester located near at the pole structure
The turbo alternator have round rotor rotating at high speeds. This solid rotor are produce the eddy current .This eddy current will produce the damping mechanism .
Damper windings are auxiliary windings.It is connected in series with the field windings.The purpose of this winding is to help the main windings to set up the complete and sufficient field for the satisfacory working without any discontinuity.
A neutral is an reference point with in an electrical distribution system. Neutral is used to connect the equipment enclosure to an earth .Care must be taken the voltage should not be higher with respect to the ground.
A ground represent an electric path ,normally designed to carry the fault current when fault occurs .
As the neutral point of an electric supply system connected to the earth or ground.
The power system said to be good earthing that is solidly grounded when the neutral of the generator or transformer connected to the ground through conductor of negligible resistance .Low voltage system we are using the solid grounding .
Bill or basic impulse level is the maximum voltage level withstand by an equipment during or before lightning .Bill is used for testing the lightning arrester .All equipment should be bill rated .
Lightning arrester are installed outside and connected to the earth.
Surge arrestor are installed inside the panel and comprising of resistor to nullify the effect of surge.
Point where all the neutral connected that circuit is called neutral link
If we are providing the fuse in phase and neutral ,the fuse in the neutral first blows and the current will flow through the phase and get shock for the operator .for that safety purpose fuse is provided only on phase wire
In vacuum CB we are using the vacuum as insulating medium .Vacuum is very good insulator and 11 k we are using the vacuum CB. In the case of SF6 CB ,the sf6 gas we are using for the arc quenching ,its used for the HT and EHT lines .
Do fuse is used as breaker when there is fault occurs and also easy to replace .