What are the typical values of characteristic impedences of
overhead line and underground cabel?
Why there is so much variation?
Answer / iamdon
Characteristic impedence of overhead line=400 ohm
Characteristic impedence of underground cable=40 ohm
Characteristic impedence= Square root of (L/C).
In case of overhead lines L dominates so higher
In case of underground cables C dominates(conductors are
very close to each other) so lower Characteristic impedence.
|Is This Answer Correct ?||3 Yes||0 No|
Zone of protection and tripping scheme of arc protection relay.
what is a tri vector meter? what are the tri vectors?
what do you mean by the "bay" in a switchyard? how to determine exact number of bays in a substation?
at the time of starting back emf of a motor is zero.so how can it will start to run??
determine two methods to find loose connection in operational electrical system?
what happen if generator of micro hydro running at only a small percentage of its capacity, as a comparison, if the diesel generator that runs on only a fraction of its capacity there will be a wet stacking
What are the effects to a distribution transformer rated 10Kv with ratio 10Kv/0.433Kv, 3phase 50hz for example but fed with power supply of 11Kv?
What is Long rod insulator and it's applications..? merits over the disc insulator ..?
when giving a supply to wounded coil it will get magnetised, but the same is not if it is not wounded on a core..and it is getiing short....why.......
What should be ideal IR value for 11kV, un earthed, 1 MW motor?
what is the current limit of lighting arrester ?
draw vector diagram and +ve,zero sequence diagram of symmetrical three phase fault.