Answer / a.p.nanjappa

DCS MEANS DISTRIBUTED CONTROL SYSTEM
PLC -PROGRAMME LOGIC CONTROL
IN A PROJECT OR REFINERY, ASSOCIATED WITH MAIN EQUIPMENT-
SUCH AS BOILER,GAS TURBINE ,STEAM TURBINE ,GENERATOR
N400,230KV SUB STATION... AND BALANCE OF PLANT EQUIPMENT-
fUEL OIL SYSTEM,FUEL GAS ,FIRE FIGHTING,WATER TREATMENT,
AUXILIARY BOILER,AIR COMPRESSOR,HVAC,RAW WATER SYSTEM.

EACH SYSSTEM IS DESIGNED BY DIFFERENT SUPPLIER WITH ITS OWN
LOGIC. tHIS IS DONE BY plc CONTROLLERS.

sO, EACH SYSTEM IS INTEGRATED WITH dcs SYSTEM.
dcs IS THE MANAGEMENT SYSTEM AND INTEGRATES ALL SUB SYSTEM .

DCS INTEGRATES ALL SYSTEM CENTRALLY. oVERALL MONITORING IS
DONE AND MAINTAINS LONG TERM EVENT RECORD.
THE ENTIRE PLANT IS OPERATED start/sTOP SEQUENTIALLY.
aLSO PERMITS DECENTRALIZED OPERATION.
AND IN

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

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