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ASCO Medium Voltage Power Transfer Switches
Product informationand specification guideASCO protects mediumvoltage loads by offeringmaintainable and highlyproven power transferswitches. The switchescan be configured withprotective relays and otheroptions to meet specificproject requirements.Switching at mediumvoltage is often preferredwhen most loads in a facility require protection, orwhen protected power isneeded at distances. Byplacing the switch nearthe source, often outside,and often with serviceentrance, many costlyinstallation complicationscan be avoided.Data centers and healthcare facilities, in particular,are being protected withmedium voltage emergencystand-by power. Other typical facilities include highrise commercial buildings,sports stadiums, water andwaste treatment plants, andpower generation stations.ASCO has been manufacturing custom switchgearand transfer switches since1947. It dedicates over600,000 square feet of factory and office space, acrossfour facilities, to designingand building systems thatmeet a range of demandingperformance requirements.Innovative designs anticipate and satisfy your evolvingpower switching and controls requirements.ASCO has developed every significant innovation in powertransfer technology since it debuted its first power transferswitch in 1920.2
A pair of medium voltage circuit breakersand an ASCO Group 5 Microprocessor Controller are theheart of ASCO Medium Voltage Power Transfer Systems.The Family of ASCO Medium Voltage Power Transfer SwitchesWhile ASCO Medium Voltage Power Transfer Switchesare functionally similarto low voltage transferswitches, they use a pairof medium voltage circuitbreakers rather than anASCO solenoid operatingmechanism. An ASCO 7000Series Power Control Centermanages the breaker operation to transfer critical loadsbetween power sources.There are three standardbase model switches available that can be providedwith most options andaccessories that are oftenrequired. Custom modifications can also be accommodated.ASCO Series 977 Medium Voltage Power Transfer SystemWe build the switches under strict quality control in afactory-controlled environment, then conduct testingthat complies with ANSIC37.20.2 Production Testsguidelines.Medium voltage switchescan be specified by selecting one of the base modelsshown in the chart below,then define specifics andoptions.Base models include acomplete transfer systemcomprising a structure,controls, circuit breakersand potential transformers. They provide basicfunctionality at the nominalamperage and voltage.Specify your system by selecting one of the base modelsshown in the chart below, then define specifics and options.3
Compare ASCO Medium Voltage Power Transfer Systems for reliability, ease of maintenance,code compliance and seismic certification.ASCO Series 977 Medium Voltage Power Transfer SystemThe ASCO Series 977 Medium Voltage AutomaticTransfer System provideshigh reliability and ease ofmaintenance. This modelcomplies with requirementsof the: UL 1008A StandardFor Medium VoltagePower Transfer Systems (1200A Models) American NationalStandards Institute, Inc.(ANSI) Institute of ElectricalSeries 977 Medium Voltage Power Transfer System,single section& Electronic Engineers(IEEE), C37.20.2 Switchgear Assemblies, C57.13Standard Requirementsfor Instrument Transformers National FireProtection Association(NFPA) NFPA 70-1999 NationalElectrical CodeThe Series 977 is rated at15 kV, 1200 amps, 25 kAIC,3 phase, 3 wire, 50 or 60 Hz.An ampere rating of 2000amps and 40 kAIC and 50kAIC also are available.Series 977 Medium Voltage Power Transfer System,two-section enclosure with right door open4The indoor medium voltage power transfer systemcomprises two vertical sections. They combine to forman enclosure that meets theSeismic requirements of theInternational Building Code.Contained in the enclosure are three, 1200 amp,25 kAIC draw out vacuumbottle circuit breakers. Theyare electrically interlockedin the open transition mode,with auxiliary contacts asrequired.Besides circuit breakers andmicroprocessor controller,other primary system components include: Potential transformers,normal feed, 95 kV BIL Potential transformers,emergency feed,95 kV BIL 3 phase, 1200 ampinsulated coppermain bus Protective barriersthat isolate majorcomponents.
Base models include a complete transfer system comprising a structure, controls,circuit breakers and potentialtransformers.They provide basic functionality at the nominal amperage and voltage.You can configure them foropen, closed, or delayed transition power transfer.Soft load transition requiresan optional controller.ASCO Medium Voltage Power Transfer SwitchesCapacitorsCapacitor trip devices provide the power to trip thebreakers open in the eventof a power outage, protecting loads from he 977 and 974 modelswith 1200A breakers areListed to UL 1008A; theseswitches are suitable for usein emergency power systems for hospitals, per NFPA99, and NEC Article 700.as those used for ASCOgenerator paralleling controlswitchgear, under UL File #E231663.The 973 model uses an IECrated breaker for international applications, andtherefore is not UL certified.Switches based on 2000Abreakers are not UL 1008AListed, but are manufactured to the similar requirements of ANSI C37.20and utilize UL Recognizedcubicle constructions.Transfer SwitchControllerAll ASCO Medium VoltagePower Transfer Switches arebuilt using the same ASCO/Underwriters Laboratoriesmanufacturing proceduresThis is the same controllerused on low voltage switches, and is described in detaillater in this brochure.The ASCO 7000 Series Control Center provides refinedand proven transfer control.Circuit Breakers:977 and 974Circuit breakers providesuperior reliability and maintainability compared to contactors. Each circuit breakercontains three separatelymounted vacuum interrupters with an integral contactwear gap indicator. Storedenergy devices allow fastoperation to interrupt andisolate faults.Transformers are chosen toprovide accurate waveformsto control and protect yourloads.ASCO uses ANSI meteringclass transformers which arebuilt per ANSI C57.13 standards to assure the highestreliability.The transformers are protected by oversized Class Efuses to assure no malfunctions could cause loads to beunprotected.Breakers can be removedeasily for inspection andmaintenance. Bypass functions are not required sincebreakers can be replacedwhile the loads are fed fromthe alternate source.5
ASCO Series 974 Medium Voltage Power Transfer SystemLike the Series 977, the Series 974Medium Voltage Power Transfer System comprises two vertical sections.The Series 974 is rated at 5 kV, 1200Amps, 40kAIC, 3 phase, 3 wire, 50 or60 Hz and compliant with UL1008A.Contained in the enclosure arethree, 1200 amp, 40 kAIC drawoutvacuum bottle circuit breakers. Theyare electrically interlocked in the opentransition mode, with auxiliary contacts as required.An ampere rating of 2000 amps anda short circuit rating of 50 kAIC also isavailable.This system also has a drawoutvacuum bottle breaker configuration,is available in open, closed and delayedpower transfer modes of operationand features the Group 5 Controller fordependable operation.The system is available in a NEMA 3Renclosure and is UL listed for mediumvoltage.Other primary components include: Potential transformers, normalfeed, 4160 volts, 60 kV BIL Potential transformers, emer-gency feed, 4160 volts, 60 kV BIL 3 phase, 1200 amp insulated copper main bus Protective barriersthat isolate majorcomponents.ASCO Series 973 Medium VoltagePower Transfer SystemThe ASCO Series 973 Medium Voltage Power Transfer System is a singlesection configuration. The Series 973is rated at 5 kV, 600 amps, 25 kAIC, 3phase, 3 wire, 50 or 60 Hz. A 31 kAIC isoptional.6The Series 973 features fixedmounted LF1 circuit breakers usingSF-6 gas. It is available in open, closedand delayed power transition modesof operation. The Group 5 Controller isstandard and the system is available ina NEMA 3R enclosure.
Optional ComponentsProtective RelaysA variety of brands andmodels are available to meetspecific project requirements. Relays are mostlyutility grade with currentand voltage signals beinghard wired. Typically a lockout relay is also provided toallow a manual reset afterfaults occur.Select protective relays thatsatisfy your specific requirements. Specifically designedmultifunction relays—including differential, overcurrent,loss of phase, loss of excitation, and reverse power—are available to help protectgenerators.Utility tie relays protect theutility source from generators and are usually prescribed by the local utility.They include overcurrent,reverse power and loss ofphase. Overcurrent and other relays located upstreamcan protect loads.A qualified consultingengineer can determine therelays best suited to yourparticular power distributionsystem.Communicationand ConnectivityCapabilitiesA number of communications and connectivitycapabilities are optionallyAdditional ControllerFeatures and Parameters Touch-pad programming,without the need for metersor variable power supplies Sixteen selectable rating voltages On-board diagnostic control paneland ATS status information foranalyzing system performance Active timing function display and countdowns Password protection to preventunauthorized tampering of settings Remote monitoring and control with ASCO PowerQuest Historical event log Statistical ATS systemsmonitoring informationavailable to facilitate monitoring and operation: An optional connectivitymodule(72E) enables remotemonitoring and control An optional power manager that senses single and3 phase voltage and current,and displays a variety ofpower parameters. RS-485Communications ModulePower MonitoringPower monitoring systemsare commonly specified formany facilities with mediumvoltage distribution systems.They provide informationabout potential fault problems, which helps building operators determinewhether equipment mayneed repair or maintenance.Class A Conducted and RadiatedEmission EN61000-4-2 Electrostatic Discharge ImmunityDirect Contact Air DischargeEN61000-4-3 Radiated Electromagnetic Field ImmunityIt is important to carefully specify the local areanetwork that the designengineer intends for thatsystem, how other communication devices mayenter into the system andhow the owner may accessthe data.Control/MeteringAdvanced electroniccontrol, monitoring andmetering ensure you getaccurate and precise operational information whenyou need it, both locallyand remotely. It providesthe information you needto make the right decisions. Refer to the table below for a range of controland metering features andbenefits.EN61000-4-5 Surge ImmunityENV50141 HF Conducted Disturbances ImmunityASCO 7000 Series Microprocessor ControllerEN61000-4-4 Electrical FastTransient ImmunityThe controller meets orexceeds a range of requirements forElectromagnetic Compatibility.(EMC):IEEE472(ANSI C37.90A)Ring WaveTestENC55011 19917
Power Control Center7000 Series Power Control CenterA four-line, 20- characterLCD with backlit displayensures easy viewing underall conditions.Navigating through allscreens requires usingonly six buttons. Eighteendifferent source parametersettings, 16 standard timedelays, up to seven independent engine exerciseroutines and a number oflanguages, including English, German, Spanish, andFrench, can be selected.ASCO 7000 SeriesMicroprocessorControllerASCO 7000 Series Medium Voltage Power TransferSwitches use the proven, microprocessor- based PowerControl Center to managecircuit breakers. Designedspecifically for this purpose,it contains timers and control logic that protect yourloads.It is the industry’s mostadvanced digital controller. All voltage, frequency,control, timing and diagnostic functions requiredfor most emergency andstandby power applicationsare standard.8The microprocessor logicboard is separated andisolated from the powerboard to protect against thesevere voltage transientsfrequently experiencedwith industrial distributionsystems. This improveselectrical noise immunityand helps comply with rigorous transient suppressionstandards.Operators easily can accessdetailed information on arange of parameters: System status, power source,frequency settings and avariety of optional featuresettings.Since the Power ControlCenter must be visible andoperable through the enclosure door, it qualifies forindustrial and outdoor applications. It can be installedin Type 3R (outdoor/rainproof), four weatherproofand 12 indoor/industrialenclosures.A wide variety of standardand optional componentsare available to configurethe system and level of performance required to satisfyyour facility’s unique needs.With decades of experiencebuilding transfer switches,ASCO designs protective circuits and interlocks that willhelp avert malfunctions.The stand alone systems areself powered so they canautomatically protect yourloads under any conditions.Additional controllerfeatures and parameters Touch-pad programming,without the need for metersor variable power supplies Sixteen selectablerating voltages On-board diagnostic control panel and ATS statusinformation for analyzingsystem performance Active timing functiondisplay and countdowns Password protectionto prevent unauthorizedtampering of settings Remote monitoring andcontrol with ASCO PowerQuest Historical event log Statistical ATS systemsmonitoring informationThe controller meets or exceedsa range of requirements forElectromagnetic Compatibility(EMC):IEEE472 (ANSI C37.90A)Ring Wave TestENC550111991 Class A Conducted andRadiatedEmissionEN61000-4-2Electrostatic Discharge Immunity, Direct Contact AirDischarge EN61000-4-3Radiated Electromagnetic FieldImmunity EN61000-4-4 Electrical Fast Transient ImmunityEN61000-4-5 Surge ImmunityENV50141 HF ConductedDisturbances Immunity.ASCO 7000 Series Microprocessor Controller
Control Switches and Indicating LightsControl switches and indicating lights provide at-a-glancestatus of system operation.Conventional 2-PositionSwitches include: Switch position indicating lights (16 mm,industrial grade LEDs) Source acceptabilityindicating lights with trueindication of the acceptability of each source, asdetermined by the voltage, frequency, voltageunbalance, and phasesequence settings of thecontrol panel (16mm,industrial grade LEDs).Three position (16mm,industrial grade type)selector switch: Automatic: normalmaintained position Test: momentary position to simulate nor-mal source failure forsystem test function Reset Delay Bypass:momentary positionto bypass transfer andre-transfer time delay.Closed TransitionSwitches show: Extended Parallel Time:Provides visual indication when the pre-setextended parallel timehas been exceeded. Thecontrols automaticallyopen the emergency ornormal main contacts.Separate contact alsoavailable to shunt tripexternal breaker. Failure To Synchronize: Visually displays afailure to synchronizealarm if the time delaysettings is exceeded,during closed transitiontransfer operation. Transfer Switch LockedOut: Prevents transferin either direction ifthe extended parallel time is exceeded. Alarm Reset: Resetsextended paralleland failure to synchronize alarms. Closed Transition Bypass:Push button allows transfer between sources in anopen transition mode. A variety of optionalfeatures and components can be added toenhance system controland communication.Accessories1G External 24VDC auxiliary power connections2C Adjustable, extended time delay on engine start (2CK for key operated)3AA Extended retransfer time delay5J Override selector switch to simulate a normal sourcefailure and cause ATS to remain in the emergency position regardless of emergency source condition ornormal source availability (5JK for key operated)5JL Override selector switch to simulate a normal sourcefailure and cause ATS to remain in the emergency position regardless of emergency source condition ornormal source availability. Pilot light indicates active.5K Key operated Feature 5 test switch5L Test selector switch with override retransfer to normal in the event of emergencysource failure (5LK for key operated)5LL Test selector switch with override retransfer to normal in event of emergency sourcefailure. Pilot light indicates active.5L1 Test switch to simulate normal source failure includesautomatic override return to normal in the event ofemergency source failure (5LK1 for key operated)6C Reset switch to manually retransfer the automatictransfer switch to the normal source after the feature3A retransfer time delay expires (6CK for key operated)6DK Key operated retransfer to normal modetwo-position selector switch permits selectionof manual or automatic manual retransfer6J Selector switch for automatic or manual transfer tonormal and emergency. Transfer mode selects automatic or manual; and manual mode control selectsnormal or emergency source. (6JK for key operated)18B 2 pole D/T contacts that operate whenemergency source voltage is present18G 2 pole D/T contacts that operate whennormal source voltage is present30B Load shed circuit31Z Selective load disconnect circuit44A 120VAC strip heater includes mountingbracket, thermostat and terminal block73N Distribution Class surge arrestors on normal source73E Distribution Class surge arrestors on emergency source102B Basler BE-1 Reverse Power Relay, 3 Phase106 Softload ControlsNOTE: Many other standard accessories available for ASCO low voltagepower transfer switches can also be applied to medium voltage transferswitch products. Please consult the factory for details.9
Applications And a Variety of RequirementsApplications for medium voltagepower transfer systems include:Transferring medium voltage powerrequires a system that differs considerably from low voltage power transfersystems, which operate at less than600 volts.There are dramatic differences insize of load, construction, cost, location, maintenance andprotection.Protection issues, for example, include increased short-circuit currents,additional protective relaying such asdifferential protection, and synchronous check relaying, among others.Relay specifications need to considerutility relaying and settings.The sequence of circuit breaker operation also demands careful planning.Ground-fault sensing issues dueto multiple source grounding canbecome complex.Also, local power utilities maydetermine the selection of distributionsystem voltage and influence speci-fication requirements for equipmentconstruction and protective relays.In fact, metal-enclosed, loadinterrupter switchgear meeting ANSIC37.20.3-4 duty-cycle ratings mayneed to be specified.Work with a manufacturer of medium voltage power transfer systemswho understands these issues and canhelp you resolve the design, operational and service challenges you face.That will help ensure a reliable systemthat performs dependably over time.ASCO Medium Voltage Transfer Switches Ordering InformationMedium Voltage Transfer Switch Catalog 737477TransitionCO OpenA Auto C ClosedD sories0 2 5T1200Z3X025T Top600T 2,400U 4,160V 11,000W 12,470X 13,200Y 13,800Z 14,4003 3,3006 6,6007 7,2000 Other1 120VAC0 NoneX YesZ VAT031040050B BottomM Mixed12002000S Softload3 24VDCEnclosuresCC Type 1F Type 3R5 48VDC6 125VDCH Type 4XR Type 3RXASCO Medium Voltage Transfer Switches ower Manager w/ Display on LoadPower Manager w/ Display on NormalPower Manager w/ Display on EmergencyBasler BE1-50/51 on NormalBasler BE1-50/51 on EmergencySR489 on EmergencyTOC Breaker Truck Operated Contact SwitchSEL351S on LoadSEL351S On 51S on EmergencySR350 on LoadSR350 on NormalSR350 on Emergency3” Infrared ViewportsLightning Arrestor Distribution GE TranquellLightning Arrestor Intermediate GE TranquellLightning Arrestor Utility GE TranquellMimic Bus On Front138A139ACallService EntranceLabeled SwitchSpecial BreakerSection OrientationSpecial DistributionSection Required
ASCO Medium Voltage Power Transfer Systemsoptimize reliability and total cost of ownership.Compare Technology, Support and ServiceWhen evaluating manufacturers, compare theirtechnology, technical support and service.TechnologyASCO is the world’s largestmanufacturer of world classpower transfer technology.ASCO products move 100million kilowatts every day.Reliably. Repeatedly.ASCO commercialized thefirst power transfer switch in1920. Today, ASCO innovations stand as milestones inpower transfer.Like low voltage power transfer switches, ASCO MediumVoltage Power TransferSwitches optimize reliabilityand total cost of ownership.An integrated power systemoffers digital control, highreliability, dependable operation, networked connectivity, seamless servicing andsimplified staff training.ASCO integrated systemsare the reference point forreliability, configurabilityand reduced maintenancerequirements.Specify exactly the mediumvoltage power transfer system you need. With somuch at stake, protect yourfacility’s Business-CriticalContinuity TM and your reputation.SupportServiceASCO Support compriseshighly-skilled teams of factory-based and geographically dispersed applicationsengineering teams led byProject Systems Managers.ASCO fields a nationwide network of 100 highly trained,full time, fully equippedtechnicians.Properly specifying mediumvoltage power transferswitches demands a thorough understanding of arange of issues you need tosolve.A team assigned to yourproject will work with youevery step of the way, fromdesign to commissioning.Its support that makes thedifference between a project that’s smooth and onethat’s not.They will help you developsolutions that reduce installation costs and save time.They’re factory trained andlocated coast to coast torespond to your emergenciesfast.They partner with 450 Emerson Electrical ReliabilityServices technicians to offerunparalleled service.Select a manufacturer whocan help you resolve the design, operational and servicechallenges you face.Select ASCO for a reliable,medium voltage switch thatwill perform dependably overtime.Contact 800-800-ASCO,or visit www.emersonnetworkpower.com/ASCO.Single sourcing enhancesproject management, accountability, procurement,delivery, installation andcommissioning.11
A SCO Power Technologies50 Hanover RoadF l o r ha m Park, NJ 07932USA8 0 0 8 0 0 A SCOw w w. em er sonnet workpower.com/A SCOw w w. ascoapu.comEmerson Network Power.The global leader in enabling Business-Critical ContinuityTM.EmersonNetworkPower.comOutside PlantAC PowerConnectivityEmbedded ComputingEmbedded PowerDC PowerInfrastructure Management & MonitoringPower Switching & ControlsPrecision CoolingRacks & Integrated CabinetsServicesSurge ProtectionEmerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. 2011 Emerson Electric Co.Publication 3242 March, 2011Printed in the U.S.A.
American National Standards Institute, Inc. (ANSI) Institute of Electrical & Electronic Engineers (IEEE), C37.20.2 Switch-gear Assemblies, C57.13 Standard Requirements for Instrument Trans-formers National Fire Protection Association (NFPA) NFPA 70-1999 National Electrical Co
