If the +Ve, -Ve & zero sequence reactances of an elements of a power system are 0.3, 0.3 & 0.8 p.u. respectively, the element would be

Choose the word which is most nearly the SAME in meaning
SPRING

On a long high voltage transmission line with heavy load, VAR compensation can be provided by using

Corona usually occurs when the electrostatic stress in the air around the conductor succeeds

A buchholz will operate in a transformer whenever there is

saftey device mounted on oil filled transformer.
give protection against internal fault in transformer winding.
test of relay : 1. leakage test 2. Electrical test 3. Functional test
this relay can detect only when the oil level is below
least operating time of relay is 0.1 sec.

Which loss in a transformer varies significantly with load?

During O.C test obtained no load losses (core loss)
During S.C. test obtained copper loss (load losses)
during loaded condition of transformer copper loss more significant than core loss.