power distribution - Siemens

13SWITCHGEARReplacement Breakers & Retrofit ProductsSafety Racking SolutionsSiemens GM Switchgear ElectricRacking AccessoryAn optional electric racking accessory isavailable for 5-15kV GM, GM-SG, and38kV GM38 switchgear. The switchgearrequires modifications to the front panelto add mounting adapters for the motordrive mechanism. The accessoryconsists of a motor drive enclosurewhich installs on mounting brackets onthe switchgear front panel of a circuitbreaker compartment. The unit includesa power cord, which can be connectedto a convenient power source in thevicinity of the switchgear. Instructionsfor mounting the racking accessory andfor racking of circuit breakers areprovided on a label on the rackingaccessory.Allis-Chalmers D and F Switchgear—Closed Door Racking ModificationIn order to improve operator safety,Siemens offers a field modification toconvert type D and F switchgear to aclosed-door, remote rack design. Thismodification provides a cost effectivesolution to keep operators clear of thearc flash zone during breaker racking.Allis-Chalmers and later Siemensmanufactured type D and F mediumvoltageswitchgear from 1958 throughthe late 1980’s. This gear utilized airmagneticbreakers that were typicallymanually racked via a lever while thecubicle panel door was open.The field modification consists of a floormountedscrew racking device and abreaker-mounted bracket to interfacewith the floor-mounted screw device.These additions allow end-users toeither have closed-door manual racking,or closed-door remote racking.The closed-door remote racking optionrequires the above mentioned cell andbreaker additions, as well as a minorfront panel modification to accept atorque-regulated motor. The motor canbe moved from one cell position to thenext, thus only one motor device isrequired.Figure 7 Motor drive mounted on CBcubicle door.Before: Original floor-mounted leverracking, commonly used on type D and Fswitchgear, required the operator to standin front of the breaker with the panel dooropen.Manuf. Model kV Ratings MVA AMPAllis-ChalmersD Gear MA 5 250 1200, 2000350 1200, 2000FA 5 350 3000F Gear FB 7 500 1200, 2000, 3000FC/FCV 15 500 1200, 2000750 1200, 20001000 1200, 2000, 3000Easily installed on existing units and can be provided for5kV, 7.5kV, and 15kV ratings, from 1200A through 3000A.GeneralFigure 8 Power and Control switch units.After: Following the field modification, thebreaker can be racked in and out while theoperator stands outside of the arc flashzone.For more information, please visit http://automation.usa.siemens.com/consultant/ or contact your local sales office.13-32Siemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog