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Answer Posted / vidhya
Well, no one really "invented" electricity, but you can ask
who discovered it. While people have known about the
powerful effects of lightning for thousands of years, the
first person to discover that lightning was a naturally
occuring form of electricity was Benjamin Franklin. In
1752, during a dangerous electrical storm, Franklin flew a
kite that had a metal key at the bottom of the string. When
a bolt of lightning hit the kite, a spark of electricity
flew from the key! From this experiment, Franklin invented
the lightning rod, which attracts lightning and draws it
into the ground. This saves many buildings from burning
down.
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Can any one give an explanation about rating factors of cable? if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?
234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,
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