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<br />/3311# <br /> <br />02-01-88 <br /> <br />SUBSTATION MAINTENANCE <br />INTERVAL AND GUIDELINES <br /> <br />APPARATUS: TranSIormers - Auto Transformer <br /> <br />Description: Inspection <br /> <br />Maintenance Interval: Not to exceed six years or 30,000 operations <br /> <br />)etails: <br /> <br />I. <br /> <br />The <br />A. <br />B. <br />C. <br /> <br />maintenance interval may be <br />History of the LTC type. <br />Number of LTC operations. <br />Transformer loading. <br /> <br />reduced depending upon: <br /> <br />II. TTR.' <br />A. High to low for all no load taps with the LTC in the neut=al <br />position. <br />B. High to low from 16 lower to 16 raise of the LTC in the no <br />load tap changer on the nominal voltage tap. <br />C. High to tertiary with the no load tap changer on the nomi~al <br />voltage tap and the LTC in the neutral position. <br /> <br />III. Power factor tests. <br /> <br />IV. Perform the following oil tests: <br />A. Color comparison. <br />B. Interfacial tension. <br />C. Dielectric breakdown. <br />D. Power factor. <br />E. Dissolved combustible gases test. <br />F. Hypot vaCUlli~ bottles if so equipped. <br /> <br />V. Inspect the LTC contacts and mechanism for wear and proper <br />adjustment. Clean and lubricate as required. This is to incl~de <br />contact resistance test. <br /> <br />VI. Inspect transformer associated hardware for damage or excessive <br />wear. Repair or replace as needed. <br /> <br />rJ,iIJ~ <br /> <br />( Reviewed <br />Vohn Dismuke <br /> <br />~j)!l~; <br /> <br />Review <br />Richa Kowalski <br /> <br />~~(~7~7t <br />;Reviewex! ./ <br />James Kyle <br /> <br />Revi ewed &. Revi sed February 1991 <br />