power distribution - Siemens

Low Voltage SwitchgearType WL Low Voltage Metal-Enclosed SwitchgearOptionsSiemens High Resistance GroundingSystem(1) The HRG section can be 22" or 32"wide. The HRG instrumentcompartment is 45" high and either19" or 24" deep depending onwhether the circuit breakers are fused.The HRG instrument compartmentwill house all of the high resistancegrounding system components eitheron the door or in the device bucketexcept for the grounding resistors.(2) The grounding resistor assembly willmount in the rear cable compartmentof the switchgear on the runbacksupport posts. It will typically mountbehind the HRG instrumentcompartment where it cannotinterfere with feeder breakerrunbacks.(3) In a typical Siemens HRG applicationwith a close coupled main breakersection, a general purpose instrumentcompartment takes up the Acompartment, the main breaker goesin the B compartment and the HRGinstrument compartment takes up theC & D compartments. An alternateHRG main breaker section can havethe HRG instrument compartment inthe A & B compartments, mainbreaker in the C compartment and ageneral instrument compartment inthe D compartment.Switchgear Mounted HoistThe integrally mounted hoist, standardon walk-in outdoor and optional onindoor switchgear enclosures, travelsalong rails on top of the switchgear toassist in breaker handling.TOC and MOC SwitchesThe Truck Operated Cell (TOC) Switchprovides interlocking control or remoteindication of the breaker rackingposition. The cubicle mounted auxiliaryswitch or Mechanism Operated Cell(MOC) switch provides interlockingcontrol or remote indication based onthe main contact position (open orclosed).ShuttersThese provide protection against accidentalcontact with primary disconnectsin a compartment when the breaker isremoved. Shutters automatically closewhen the breaker is withdrawn and arepadlockable and field installable.Key InterlockThis provides a mechanical means foroperating circuit breakers and otherdevices only when predescribed conditionsare met.Test SetA portable breaker test set is available asan option and supports testing the fullrange of functions and protectivesettings supplied with the breaker tripunit.Metering and Auxiliary CompartmentsCompartments are available to housedevices such as voltage transformers,metering, control power transformers,and supervisory devices.Instrument and Control TransformersVoltage transformers and control powertransformers are mounted in auxiliarycompartments. These transformersare protected by primary pull-out typecurrent-limiting fuses and secondaryfuses. Current transformers are normallymounted on the compartment primarydisconnect studs where they are readilyaccessible.Miscellaneous▪ Each switchgear lineup includes abreaker lifting device that is adjustablefor use with Size II and Size IIIbreakers▪ An optional portable breaker hoist isavailable if the integrated breaker hoistand track is not specified▪ A test cabinet is also available as anoption. The test cabinet is wall mountednecessary equipment for testingelectrically-operated breakers thathave been removed from the breakercompartment. The test cabinet doesn'tinclude or replace a breaker trip unittester▪ 4" high formed steel channel sillsare available for indoor switchgearenclosuresOutdoor SwitchgearType WL switchgear is available in twooutdoor (NEMA 3R) enclosures. Walk-inand non walk-in versions are availableto meet your particular application.For protection from snow, rain andother foreign matter, both outdoorenclosures rest on a six-inch high,formed steel base which providesrigid support and a tight bottomseal. A heavy duty protective undercoatingis applied to the undersideof all outdoor enclosures to protectagainst moisture and corrosion.Shielded ventilation housings permitproper air circulation while excludingdirt and foreign matter.In the walk-in outdoor enclosure alighted, unobstructed service aisle isprovided at the front of the switchgearallowing inspection and maintenanceGeneralwithout exposure to the elements.An access door equipped with anemergency bar release is located ateach end of the aisle.The following features are standardwith walk-in outdoor enclosures.(1) Space heaters in breaker compartmentand bus compartment.(2) Screens and filters for exteriordoor ventilation louvers.(3) Incandescent lighting receptaclewith three-way switch at each aisleaccess door.(4) Duplex receptacle with ground faultprotection at each aisle access door.(5) Load center for power distributionto lights, receptacles, switches andheaters.For non walk-in outdoor enclosures,space heaters and screens/filters forventilation louvering are standardwith lighting, receptacles, switchesand load centers offered as options.Side ViewRear View13 SWITCHGEARSiemens Power Distribution & Control, SPEEDFAX 2007-2008 Product Catalog 13-45