Eaton MVS Instructional Booklet

Contents

15Instructional Booklet IB02102006EEffective May 2011Type MVS (previously WLImetal-enclosed switchgear4.76 kV, 15.0 kV, 27.0 kV, and 38.0 kVeaton corporation www.eaton.comConnection of space heaters to customers sourceSpace heaters, when supplied, must be energized to preventcondensation Heaters are supplied for 120- or 240-volt sourcesas shown on the drawingsFor switchgear assemblies with or without heater control devices,heaters will be internally wired and brought to a terminal blockA wiring diagram will be furnished with the drawings showingconnection points for powerSuperstructure assemblyReceivingCheck to verify that all parts necessary for assembly havebeen received The packing list will show all required items(bus, hardware, phase barriers, taping material, etc ) and willindicate in which shipping subassembly the various parts are locatedInstallation of the superstructureStep 1e: If a multiple vertical section assembly, join as per theinstructions on page 5 Secure the vertical sections to thefoundation as per the instructions on page 12Step 2e: Remove the top sheet from the vertical section On indoorswitchgear, this top sheet will later be re-installed on the superstruc-ture using the same mounting hardware Outdoor switchgearis shipped with the roof attached to the superstructure portionsof the vertical sectionsThe top sheet on the lower portion of each vertical section is usedfor shipping purposes only and may be discarded after removalStep 3e: Remove the superstructure from the shipping pallet andthen remove all covers Shipment of more than one MVS verticalsection will be tagged to identify superstructures with their cor-responding switch units Install the superstructure atop the verticalsection(s) using the bolts, nuts, washers, and/or self-tapping screwsas provided Occasionally, the superstructure assembly will becomeslightly “sprung” in shipment so that it does not align exactly withthe top of the switch enclosure If this should occur, install the boltsor screws in all holes that align then use a pinwrench to pry adjacentholes into alignmentStep 4e: Remove the bolts securing the lifting eyes Remove thelifting eyes then replace mounting bolts just removedBus assemblyAll bus sections have been assembled at the factory and have beenchecked for clearance prior to shipmentStep 1e: Units without a horizontal main bus require installation ofone piece of bus section per phase from the upper switch terminalpad to the incoming line termination Each phase bus is attached intwo places:1. To the upper switch terminal pad2. To the bus support insulator mounted in the superstructureUse the bolts provided to secure the bus sectionsStep 2e: Units with a main bus also require horizontal bus sectionsbolted to the bus support insulators Phase bus risers are then bolt-ed from the switch terminal pad to the main horizontal bus Lineupsshipped in more than one section will be supplied with horizontalbus lengths corresponding to widths of shipping sectionsAfter installation, join the horizontal bus sections using the spliceplates providedStep 3e: Tighten all bolted bus connections to the torque values givenon page 28Step 4e: Any bus requiring field taping will be identified by a redtaping tag Taping material is provided The taping procedures,described in “Field taping of electrical connections” section onpage 11 should be followedReplacing coversStep 1e: Install the roof panels and switchgear covers using thehardware providedStep 2e: For outdoor units, install the roof caps according to theprocedures detailed on page 5.Switch inspection before startup WARNINGFAILURE TO ENSURE THAT NO TOOLS OR OTHER OBJECTS AREACCIDENTALLy LEFT INSIDE EACH VERTICAL SECTION MAy RESULT INEQUIPMENT DAMAGE, BODILy INJURy, OR DEATH.BEFORE REPLACING COVERS, THOROUGHLy INSPECT BUS WORK ANDPHASE BARRIERS, THEN PERFORM FIELD DIELECTRIC TESTS TO ENSURETHAT NO TOOLS OR OTHER OBJECTS ARE ACCIDENTALLy LEFT INSIDEEACH VERTICAL SECTION AND THE DIELECTRIC INTEGRITy OF THESWITCHGEAR ASSEMBLy IS INTACT. WARNINGEACH SWITCH IS PROPERLy ADJUSTED AT THE FACTORy BEFORE SHIPMENT.HOWEVER, VIBRATION AND MECHANICAL STRESSES IMPOSED By TRAN-SIT AND INSTALLATION CAN ADVERSELy AFFECT SWITCH ADJUSTMENT.THEREFORE, A FINAL INSPECTION IS ESSENTIAL BEFORE ENERGIzING.IF THIS INSPECTION REVEALS ANy DEFECTS IN ADJUSTMENT, THEySHOULD BE CORRECTED ACCORDING TO ALIGNMENT PROCEDURES ONPAGE 18.Step 1e: Check bolted bus connections for proper tightness, referringto page 28 for recommended torque valuesStep 2e: If non-disconnect mounted fuses are supplied, check theplastic knobs that hold the fuses in place They should be hand tightStep 3e: If disconnect fuses are supplied, check to see that they arecompletely latched closedStep 4e: For units fitted with expulsion-type boric acid fuses, checkthe discharge filters on the lower end of the fuses for tightnessThey must be securely hand tightenedStep 5e: Check to see that the space heaters, if supplied,are energizedStep 6e: Wipe away any dust or dirt that may have accumulated incompartment(s), paying particular attention to insulators andinsulating material If the bus is insulated, see page 22 forcleaning proceduresStep 7e: A final thorough inspection should be made to ensure thatno tools or other objects are accidentally left inside the enclosure