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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High voltage bushingsHigh voltage leads for ratings 2.4 kV and up are normallybrought through the tank end wall using a cycloaliphaticepoxy or porcelain bushing. To prevent excessive mechanicalloading of the bushing, only flexible connections should bemade to the bushing terminal. The bushing should neverbe used as a structural member to support other current-carrying parts.Care must be taken in handling the bushing to avoidcracking the porcelain or damaging its surface.Should it become necessary to replace a bushing or itsgasket, proceed as follows:1. Vent the tank to the atmosphere until pressure is zero.2. Lower the liquid level to a point below the bushinglevel.3. Remove the nuts and washers used to clamp theflange of the bushing.4. Pull the bushing outward as far as necessary to replacethe gasket and/or to unfasten the cable connection atbushing inner end.Only in rare circumstances will there be insufficient slackin the cable leads to facilitate bushing replacement throughthe wall. The alternative means of gaining access to theconnections is through the manhole.When reinstalling the bushing, install a new gasket in thegasket recess on the underside of the flange to insure thatthe gasket is properly seated in the groove. A flat washerand lock washer should be placed between the mountingnut and the flange. After the nuts are finger tight, each oneshould be tightened to a torque of 60±5 inch pounds. Aftercompletion, pressure test the transformer.When condenser-type bushings are used, supplementaryleaflets forming a part of the complete instruction book willbe provided.Low voltage bushingsLow voltage leads for ratings in the 1.2 kV Class arenormally brought through the tank wall using an indoorbushing. This is a cast resin, cycloaliphatic epoxy orporcelain bushing.The low voltage bushing should not be used as a structuralmember. As a rule, only flexible connections should bemade to any bushing. Avoid rigid connections betweenthe bushing and other bus supports to eliminate thermalexpansion forces to the bushing.If a bushing is damaged and leaking transformer coolant,contact your factory representative for proper repairprocedures.Figure 7 High voltage bushingFigure 8 Low voltage bushings7SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016 |
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