Answer / pillay

Most importantly the insulation and HV holding test is done on
all the installations.
on the tx former;winding insulation test,
ratio test, vector group test,impedence test, oil dielectric and
other test,
bucholtz relay test, all protective equipments operation test,the
switchgears insulation and conductivity tests along with pressure
tests on cables also . all tests have to meet the local
requirements or as relevant BS.

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