Eaton MVS Instructional Booklet

Contents

7Instructional Booklet IB02102006EEffective May 2011Type MVS (previously WLImetal-enclosed switchgear4.76 kV, 15.0 kV, 27.0 kV, and 38.0 kVeaton corporation www.eaton.comConnections to a medium voltage assembly (MVA)metal-clad switchgear assemblyIndoor switchgearFollow the same procedures outlined in “Connections to anAMPGARD medium voltage MCC” section aboveOutdoor switchgearStep 1e: Position the units side by side The holes in the MVS sidesheet around the bus cutout will match the holes in the metal-cladswitchgear flangeStep 2e: Press the sponge neoprene gasketing tape, supplied withthe MVS switchgear, onto the flange for the weather-tight sealStep 3e: Join the enclosures using the bolts supplied with the MVSThe opposite side of the metal-clad switchgear flange has nutswelded in place for ease of connectionStep 4e: Make the bus connections as per “Connection by busbar”section aboveConnection of customer power cablesFigure 6 through Figure 15 show the suggested means for connec-tion of the incoming or exiting cables (maximum of two per phase,500 kcmil) to the MVS switchgear The letters in each figure applyto the itemized subjects (A through E) that follow All necessarymaterials to perform the cable installation are to be provided byothers unless specifically noted otherwise in the detailed instruc-tions or where specifically purchased with the switchgear assemblyTo install the incoming and exiting cables, follow these instructionsA. The switchgear terminals—For incoming power, the terminalsare usually located at the top of the switch in a vertical sectionFor outgoing circuits, the terminals are beneath the switch ifunfused, or on the fuse mounting if fused Each terminal padhas a two-hole pattern suitable for either a single hole terminalor a terminal with a two-hole National Electrical ManufacturersAssociation (NEMAT) drilling pattern The terminal lugs for thecable, if purchased with the switchgear, will be bolted to theswitchgear terminals If the terminal lugs are not there, thenthey are to be provided by others The terminals of the switch-gear are not suitable to support the weight of the cable It willbe necessary to support the weight of the cable with the cablesupport angle discussed in C belowB. Cable electrical stress relief devices—The design of MVSswitchgear is based upon use of “pre-formed” type electricalstress relief devices such as 3-M Quickterm-IIT, RaychemT heatshrink termination systems, etc The stress relief devices are tobe provided by othersC. Cable support channel(s)—The cable support channel(s) is notsupplied by Eaton unless purchased as a feature at the time ofoffer The cable supports may be mounted to suit the geometryof the installation by drilling holes in the switchgear structureto suit The tamper-resistant hardware provided is to anchor thesupport channel(s) to the structure Use the regular hardware tofasten the channel(s) to the mounting clips The means to fastenthe cable to this channel(s) is to be provided by others There area large number of commercially available cable support devicesthat can be fastened to this channel(s) to support the cable sothat the cable weight is not hanging on the switchgear terminals WARNINGFAILURE TO INSTALL THE CABLE SUPPORT MAy RESULT IN DAMAGE TOTHE SWITCHGEAR TERMINALS, WHICH IN TURN MAy RESULT IN MAJOREQUIPMENT DAMAGE AND CAUSE SEVERE PERSONAL INJURy OR DEATH.THE CABLE SUPPORT MUST BE INSTALLED AS INSTRUCTED IN THISDOCUMENT.D. Lacing cord or other equivalent materials/means—The cablesmust be lashed together to restrain the cables if a short circuitshould occur This material is to be provided by others For largecables and/or cable reverse loops, it may also be necessary tolash the cable bundle(s) to the support channel The views showthis suggested fastening of the cable bundles WARNINGFAILURE TO LASH THE CABLES TOGETHER MAy RESULT IN DAMAGE TOTHE SWITCHGEAR, WHICH IN TURN MAy RESULT IN MAJOR EQUIPMENTDAMAGE AND CAUSE SEVERE PERSONAL INJURy OR DEATH.THE CABLE MUST BE LASHED TOGETHER AS INSTRUCTED IN THISDOCUMENTE. Current transformer(s)—The current transformer(s) is to bemounted on the side of the cable support that will physicallysupport the current transformer(s) so it will not slide down ontothe stress relief devices The high voltage cable is to be routedthrough the current transformer The H1 side of each currenttransformer is to be toward the normal source of electric powerEach current transformer secondary wiring is terminated at aplug This plug is to be placed in the terminal block receptacle tomatch the phase on which the current transformer is mountedThe switchgear terminals will have phase labeling The secondarywires are to be fastened to the support channel so they can notfall into high voltage parts