Eaton COOPER POWER Series Installation, Operation, And Maintenance Instructions And Parts Replacement Information
Also see for COOPER POWER SERIES: Installation and operation instructionsInstallation instructionsInstallation instructionsInstallation and operation instructionsOperation instructions
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MaintenancePeriodic inspection1. External: Periodically check the condition of the paintand finish, especially when the transformer is exposedto inclement atmospheric conditions. If weatheringtakes place, clean the tank thoroughly, wipe off anyinsulating liquid that might have been spilled on thesurface and repaint with a factory approved paint.Occasionally, inspect and tighten all bolted joints andcheck for leaks.2. Regularly inspect all gauges. The liquid level mustremain normal, considering the temperature effect.Refill when samples have been taken. Prolongedperiods of zero pressure could indicate a gas leak andshould be checked out. The liquid temperature shouldnot rise higher than the design value on the nameplate,plus ambient temperature.3. Liquid samples should be taken periodically andanalyzed as indicated under "Sampling". It is recom-mended that you keep a log of the test values todetermine when reconditioning or replenishing serviceis required.Removing and replacing bushingsBushing construction falls into two general categories:"draw lead" type as represented by Figure 12 and bottomconnected types with a fixed center stud or internal spadeas represented by Figure 13.The method for removing bushings will differ dependingupon the type of construction. The two methods are dealtwith separately in the written material that follows.Before any work commences, standard safety precautionsmust be observed.WARNINGBefore working with bushings, make sure that thetransformer is de-energized and that all circuits toand from the transformer are grounded in order todischarge any stored energy and prevent accidentalre-energization Failure to do so may result in death,severe personal injury and equipment damageAdditional precautions include the following:• Lock in the “open” position disconnect switches in thesupply lines to and from the transformer.• If the transformer is under vacuum or pressure, bring thetank to ambient pressure.• If the bushing to be removed is below the liquid level,lower the level sufficiently to prevent fluid loss.• To protect from the atmosphere and contaminants, storein clean, dry, sealed containers any removed liquid thatwill be returned to the transformer.Removing and replacing draw lead type bushingsRemoving1. Unscrew and remove the top terminal cap, exposingthe threaded stud end of the draw lead cable. In somecases, the threaded stud will be held by a pin that mustalso be removed.2. Fasten a pull wire, cord or rod to the stud in order toguide the lead through the bushing’s bore and preventit from falling into the opening when the bushing isremoved. (In some cases, the lead will be of sufficientthickness to be self-supporting; if so, this part of theprocedure can be omitted).3. Remove the bushing mounting clamp nuts at the tankto release the mounting clamp plate and free thebushing for removal.4. Remove the bushing, guiding the draw lead conductorand terminal stud through the base of the bushing.Figure 11 Draw lead type bushing11SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016 |
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