Eaton VCP-W Series Instructions For Installation/operation/maintenance/servicing

Also see for 120VCP-W25: Installation, operation and maintenance Instructions for installation, operation and maintenance

Contents

47Instruction Booklet IB131006ENEffective March 2019Instructions for installation,operation, and maintenance of typeVCP-W vacuum circuit breakersEATON www.eaton.com5.5 Interlocks and interfacingRefer to Paragraph 4.9 of this manual for detailed informationconcerning circuit breaker interlocks and their interfacing with aswitchgear structure compartment. In addition, refer to the instruc-tion manual supplied with the switchgear assembly.5.6 Levering mechanismBPI pan assembly: (Figure 12)The purpose of the levering device is to move the circuit breakerbetween the DISCONNECT, TEST, and CONNECTED positions. ForType VCP-W circuit breakers, the device is a racking screw, rackingnut, and moving block.Although the device is mounted in the switchgear compartment, abrief description here will help understand the operation (Figures 12and 15). For additional information on the insertion and removal of acircuit breaker from its compartment, refer to paragraph 4.8.1 in thismanual.The levering device consists of a racking screw, a racking nut,moving block, two side rails, and a slider. In the DISCONNECTposition, the moving block is all the way to the front of the rackingscrew. As the circuit breaker is pushed into the breaker cell, thelevering latch snaps on the moving block. In this position the frontcover of the breaker will be aligned with the black line associatedwith the green area of the label. In order to turn the racking nut,push on the slider with the levering-in crank until fully engaged.Turning the levering-in crank clockwise while still pushing forwardon the slider advances the circuit breaker toward the TEST (approxi-mately six full turns) position. In this position, the front cover of thebreaker will be aligned with the black line associated with the yellowarea of the label. During this travel, the trip floor tripper is liftedup holding the circuit breaker trip free. When the circuit breakerreaches the TEST position, the breaker can be closed. Turning thelevering-in crank clockwise while pushing forward advances thecircuit breaker toward the CONNECT position.Rotate the levering-in crank in a clockwise direction until the torquelimiter on the levering-in crank “breaks free.” As a position verifica-tion:• BPI pan assembly: the breaker cover plate MUST align with theblack line associated with the CONNECTED position, locationshown on the BPI label (Figure 12, item 7).If the circuit breaker is closed in the CONNECTED position, theslider can be pushed forward to permit engagement of the levering-in crank which will trip the breaker by pushing up on the trip floortripper. This functionality is enabled by the “L” shaped slider inter-lock.The breaker can be moved to the TEST position by pushing forwardon the levering-in crank and turning the racking screw counterclock-wise until the breaker reaches the TEST position.The breaker can be moved to the DISCONNECT position by pushingforward on the levering-in crank and turning the racking screw coun-terclockwise until the breaker reaches the DISCONNECT position(approximately six full turns).The circuit breaker levering latch can be disengaged only when thecircuit breaker is in the DISCONNECT position by lifting the lift/pullhandle. As the circuit breaker is withdrawn, it comes out with thecontacts open and the springs discharged because of the close floortripper and trip floor tripper interlocks.Non-BPI pan assembly: (Figure 13)The purpose of the levering device is to move the circuit breakerbetween the TEST and CONNECTED positions. For Type VCP-Wcircuit breakers, the device is a racking screw, racking nut, andmoving block.Although the device is mounted in the switchgear compartment, abrief description here will help understand the operation (Figures 13and 15). For additional information on the insertion and removal of acircuit breaker from its compartment, refer to paragraph 4.8.1 in thismanual.The levering device consists of a racking screw, a racking nut,moving block, two side rails, and a slider. In the TEST position, themoving block is all the way to the front of the racking screw. Asthe circuit breaker is pushed into the breaker cell, the levering latchsnaps on the moving block. In order to turn the racking nut, pushon the slider with the levering-in crank until fully engaged. Turningthe levering-in crank clockwise while still pushing forward on theslider advances the circuit breaker toward the CONNECTED position.During this travel, the Trip Floor Tripper is lifted up holding the circuitbreaker trip free. When the circuit breaker reaches the CONNECTEDposition, the levering-in crank will “spin-free” and cannot advancethe breaker any further. A red flag indicates that the circuit breakeris fully engaged.If the circuit breaker is closed in the CONNECTED position, theslider cannot be pushed forward to permit engagement of thelevering-in crank due to the “Z” shaped slider interlock.After tripping the circuit breaker, push on the slider with the levering-in crank until fully engaged. Turning the levering-in crank clockwisewhile still pushing forward on the slider advances the circuit breakertoward the DISCONNECT position. This position is indicated by nofurther motion of the crank and by the green flag indicating that thecircuit breaker has reached the TEST positionAutomatic/manual hybrid secondary (optional - Figure 46): It willfunction the same as the Non-BPI pan assembly above due to thereplacement of the “L” bracket with the “Z” bracket.5.7 Operations counterAll circuit breakers are equipped with a mechanical operationscounter. As the circuit breaker opens, the linkage connected to thepole shaft lever advances the counter reading by one (Figure 5).5.8 Ground contactThe ground contact is an assembly of spring loaded fingers providinga disconnectable means for grounding the circuit breaker chassis,after it has been inserted into a switchgear structure. The groundcontact is located on the left side of the circuit breaker under themechanism bottom pan. An extension of the switchgear ground busis secured to the cell floor in such a position to engage the groundcontact automatically, when the circuit breaker is moved into theDISCONNECT or DISCONNECT / TEST position. It remains engagedin all other circuit breaker positions within the cell (Figures 12, 13,and 15).5.9 MOC and TOC switch operationsThe mechanism operated cell (MOC) switch operator is coupled tothe pole shaft (Figure 15). In the TEST and CONNECTED positionsof the circuit breaker, the operator aligns directly above the MOCswitch bell crank levers in the cell. As the circuit breaker closes,the operator moves down and pushes the bell crank lever to changethe MOC switch contact position. Thus, the MOC switch contactsoperate in the same manner as the auxiliary switch contacts in thecircuit breaker. Although the MOC switch operator is provided on allcircuit breakers, the cell mounted MOC switches are only providedwhen specified with the switchgear order. The standard electri-cal connector for the control wires is a plug on style connector.Optional ring tongue lug connectors can be provided.The truck operated cell (TOC) switch operator is mounted inside theright corner of the circuit breaker cell (Figure 15). It operates theTOC switch as the circuit breaker moves to the CONNECTED posi-tion in the switchgear cell.