power distribution - Siemens

Medium Voltage EquipmentArc Flash SolutionsSARRACS Remote BreakerRackingProtection for your most importantinvestments: your personnel and yourequipment!Incidents of serious and sometimes fatalinjury have become an all too commonoccurrence when faults occur while circuitbreakers are being racked in or out on alive bus. NFPA 70E-2004 (referenced inOSHA 29CFR-1910-S Appendix “A”)requires that personnel wear full-bodyflash suits during racking procedures onan energized system. However, asoperators must stand within the flashboundary, they are still at considerablerisk due to intense heat, concussionforces and airborne debris should a faultexplosion occur. Now, by allowingoperators to remotely perform rackingprocedures from a distance of up to 40feet, SARRACS safety breaker systemfrom Siemens provides increasedprotection for your most importantinvestments: your personnel and yourequipment.SARRACS (with CustomTorque) provides the following:Operator Safety▪ Remote operation– Personnel safely operate breakerracking system from a distance of up to40 feet▪ Eliminates need for special personalprotective equipment (PPE) duringracking– Since operator is outside the flashboundary, a full-body flash suit is notrequired▪ Completely portable– Ball bearing wheels, casters, andtransport handle for easy maneuveringGeneralBreaker Safety▪ Utilizes state-of-the-art SIMATIC ® S7-200 PLC from Siemens– Digital position control for consistentand accurate breaker engagement– Customized position-torque controlprovides protection to minimizeequipment damage– Auto reverse (optional)– Speed control– Ramp up/ramp down– Interface optionsFlexibility▪ Programmable to allow for varying torqueprofiles and mechanical requirements ofindividual circuit breakers in a lineup▪ Mechanically adjustable to allow fordifferent circuit breakers in the samelineup▪ Portable and self-contained– Easy to store and transport– Strong but light (approx. 200 lb.)▪ Designs available for most circuitbreakersSiemens Industrial Services can providetraining and on-site modificaions if required.13 SWITCHGEARMedium Voltage EquipmentArc Flash SolutionsRemote Circuit BreakerController SystemAlternate to Arc-Resistant switchgearSiemens can offer a cost effectivesolution that satisfies the NFPA 70Erequirements which provides improvedpersonnel safety when coupled withconventional switchgear.With the Siemens CB Controller (C7)there is no longer a need to stand in frontof the circuit breaker cell to view circuitbreaker status, operate the circuit breakeror view metering information. All of thiscan be done from a safe distance fromthe switchgear.This places the operator or maintenancepersonnel at a safe distance while theyperform these necessary functions.Each lineup would be supplied with itsown controller as follows.The system consists of two hardwarelevels. They are the Siemens SIPROTECprotective relays installed for each circuitbreaker in the switchgear and the touchscreen CB Controller C7 mounted remote.The two levels are connected via aProfibus communication link. Allnecessary security measures are availableto prevent unauthorized usage.Siemens will configure the systemcompletely and test all communicationfunctionality and relay data.The above solution in conjunction withremote circuit breaker racking (seeTypical schemeGeneralSARRACS above) allows for circuitbreaker operation and racking withoutbeing in front of any circuit breaker duringthe trip/close function or the racking in/outprocedure.When operated correctly, a circuit breakercan be tripped and racked out withoutbeing in the flash hazard zone.Siemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog 13-23