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<br /> JOC- <br /> f'1RR 12 /96 03: 07PI'f LCRA SUB. SERVICES 0.' P.l <br /> ATTACHMENT 'N <br /> . '. <br /> SUBSTATION SERVICES <br /> TRANSFORMER DIAGNOSTIC TESTING AND LTC INSPECTION <br /> PROCEDURES <br /> DIAGNOSTIC TESTS <br /> POWER FACTOR TES! ON ALL WINDINGS (DOELEMETHOD) <br /> WINDING EXCITATION TEST (DOELE METHOD) <br /> 'DC' WINDING TEST ON ALL WINDINGS <br /> TRANSFORMER TURNS RATIO (TIR) <br /> RECORD CURRENT AND WATTS LOSS FOR ARRESTERS (DOBLE METHOD) <br /> POWER FACTOR AND Cl/C2 TESTON ALL BUSHINGS <br /> POWER FACTOR TEST ON XFMR INSULATING OIL AT AMBIENT TE~ERATURE <br /> XFMR INSULATING OIL DIELECTRIC TEST (AS1'M 1816 USING- .04 GAP A.~ .5 KVlSEC RATE) <br /> XFMR INSULATING OIL DISSOLVED GAS IN OIL ANAL YSrS WITH RESULTS FROM A REPUTABLE LABORATORY <br /> . . XFMRINSULATING OIL:MINI SCREEN (DISSOLVED H2O CONTENT, NEUTRALIZATION NillvIBER, AND INTERFACIAL <br /> TENSION lvIEASUREMENTS) <br /> LTC INSPECTION <br /> ~ <br /> REMOVE INSULATING OIL, FILTER OIL, TAKE DIELECTRIC TESTS (ASTM 877 USING.1 GAP AND <br /> 3 KV/SECRATE) <br /> , . MAKE ALL CHECKS ACCORDING TO MAN'OF ACTURERS RECOMMENDED INSPECTION PROCEDURES <br /> CHECK CONTACT RESISTANCE IN MICRO-OHMS ON THE REVERSING SWITCH Ai'ID ALL LOAD CONTACTS <br /> .. REMOVE ALL FREE CARBON FROM LTC CO:MPAR'I1vJENT AND ABRADE LOAD CONTACT AND REVERSING SWITCH <br /> WIPE SURFACES <br /> . TEST LTC CONTROLS <br /> <br /> j <br /> ! <br /> , <br /> : <br /> : <br />