Eaton VCP-W Series Instruction Book

Also see for VCP-W Series: Instructions for installation/operation/maintenance/servicing Instruction leaflet

Contents

11Instruction Book IB182312EN June 2016 www.eaton.com50/75/150 VCP-WSelectable Ground and Test DeviceSECTION 4: DESCRIPTION AND OPERATIONThe SG&T is a draw out device that can be inserted into a circuitbreaker cubicle in the same manner as the 150 VCP-W CircuitBreaker. It can be ordered as a single terminal device or a doubleterminal selectable ground and test device. Each terminal is isolatedfrom each other and the ground bus connections by insulatingbarriers. The upper and lower terminals are accessible upon openingthe respective front hinged door. The ground connection is easilyaccessible on the lower front section of the device (Figure 3.3.a).Interchangeable primary disconnects allow the SG&T device to beconverted between the available amperes for this device. (1200A /2000A and 3000A) WARNINGIT IS MOST IMPORTANT THAT THE LOAD OR LINE TERMINALS BECORRECTLY IDENTIFIED FOR EACH COMPARTMENT BEFORE USING THISDEVICE.Type 150 VCP-W Selectable Ground & Test devices are also availablewith either the upper or lower terminals only.4.1 INSULATING BARRIERSInsulating barriers are GPO-3 glastic material used to isolate theprimary terminals from each other and the ground connections.4.2 BUSHINGS AND DISCONNECTING CONTACTASSEMBLIESThe upper and lower bushings, which are the primary circuitterminals of the selectable ground and test device, consist ofsilver plated insulated conductors. Multiple finger type primarydisconnecting contacts at the ends of the conductors providesmeans for connecting and disconnecting the SG&T device to the busterminals in the switchgear compartment. (Figure 3.5)4.3 GROUNDING CONTACTSThe grounding contact is an assembly of spring-loaded fingers,which ground the device by engaging the switchgear cell groundingbus when the SG&T device is levered into the “connect” position.The ground contact is located at the lower section of the device, onthe truck, and visible from the front of the device. (Figure 3.3.a)4.4 BREAKER-CELL CODING PLATES NOTICECODE PLATES WILL BE SUPPLIED PER SWITCHGEAR REQUIREMENTS ANDTHEREFORE AMPERAGE/RATED SHORT-TIME CURRENT ARRANGEMENTSWILL NOT BE COVERED IN THIS MANUAL. DETAILED INFORMATIONON THE SPECIFIC CODE PLATE OPTIONS WILL BE PROVIDED WITH THECUSTOMER ORDER.This is a combination of a notched plate in the cell and interferencebars on the breaker, so that only appropriately rated breakers can beput into the cell (Figure 3.3.a). WARNINGFOR 1200A/2000A/3000A UNIVERSAL SELECTABLE GROUND & TESTDEVICES A CODE PLATE HAS BEEN FACTORY INSTALLED TO MATCH THERATING OF THE FACTORY-INSTALLED PRIMARY DISCONNECTS. ENSURETHAT THE CORRECT PRIMARY DISCONNECTS AND CODE PLATES HAVEBEEN INSTALLED FOR THE CORRECT APPLICATION.4.5 CELL POSITION DESCRIPTIONPosition A: This is the withdrawn position. In the withdrawn position,the selectable ground and test device is out of the cell. The rackinghandle is not required for this position.Position B: As the SG&T device is pushed into the cell, it will reach amechanical stop. This is the “disconnect” position.Position C: Continue rotating the racking handle until the rotatinghandle turns freely, and the SG&T device stops moving. The devicewill have reached the “connect” position. (Figure 5.11) Remove theracking handle.Figure 4.1. Installed Code Plate (1200A/50kA Unit Shown)Figure 4.2. Primary Disconnect Installed (3000A)