Answer / binod

as the transformer capcity small so only megger value can
decided to make it on.IF STAR/STAR CONNECTED THAN ALL STAR
POINT EARTH REMOVED.IF DELTA/STAR THAN THE STAR POINT EARTH
BE REMOVED.
ph to earth(p)MEGGERED IF SATSFIED
ph to earth(s)MEGGERED IF SATSFIED
PH(P) TO PH(S) MEGGERED IF SATSFIED
VOLTAGE RATIO TEST(PRIMARY HV TO SECONDARY LV)
GIVING LOW VOLAGE TO HIGH VOLAGE SIDE AND MEASURE THE
VOLTAGE IN LOW VOLTAGE SIDE IN ALL PHASE(LINE VOLTAGE AND
PHASE VOLTAGE) IF ALL THE ABOVE VALUES SATISFIED THAN THE
TRANS.MAY BE ENERGISED.

If you have an earth with pilecap then your resistance is really low. why and how?

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WHAT SHOULD BE THE BEST CURRENT RATINGS (PRIMARY / SECONDARY)FOR A CT INSTALLED AT THE INCOMING 11KV PANE? WILL IT BE CALCULATED ON THE BASES OF MAXIMUM DEMANT VALUE OR ON SUM OF ALL TRANSFORMER'S KVA? NOMALLY MAX DEMAND REPRESENT THE MAXIMUM OPERATING LOAD OF THE PLANT AND TOTAL KVA OF (SAY 5 NUMBERS TRANSFORMERS) REPRESENT THE CONNECTED LOAD. WHICH i.e. MAX DEMAND KVA OR CONNECTED KVA ARE BETTER TO USE FOR CT CURRENT CALCULATION? PLEASE ANSWER.

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