Specification Bulletin 682-31 - S&C Electric Company

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S&C Remote Supervisory Vista® Underground Distribution SwitchgearConditions of Sale—ContinuedCoordinating-speed curves have phase-overcurrentand—for three-pole tripping fault interrupters only—ground-overcurrent settings. (The latter can be turned offif desired.) These curves can be tailored to the applicationusing a variety of instantaneous and definite-time settings.UnderCover StyleWhen the UnderCover Style is specified, a stainless-steeltank with submersible wiring is furnished suitable forunderground installation. A mild-steel or, optionally,stainless-steel low-voltage enclosure is mounted on acustomer-supplied pad at grade level. It is connected to thetank with cabling up to 45 feet in length.Vault-Mounted StyleTwo versions of this style are available: Wet-Vault-MountedStyle is intended for vaults that are subject to periodicflooding and includes submersible wiring and electricalcomponents. Dry-Vault-Mounted Style is intended for vaultsthat are not subject to periodic flooding and does not includesubmersible wiring and electrical components.When the Wet-Vault-Mounted Style is specified, astainless-steel tank is furnished, suitable for mounting on thefloor or wall of a vault. When the Dry-Vault-Mounted Style isspecified, a mild-steel tank is furnished. The mild-steel or,optionally, stainless-steel low-voltage enclosure is mountedon the vault floor or wall; it is connected to the tank withcabling up to 45 feet in length.Pad-Mounted StyleWhen the Pad-Mounted Style is specified, a mild-steel or,optionally, stainless-steel enclosure is furnished. A mild-steelor, optionally, stainless-steel low-voltage compartment ismounted on the side of the enclosure.Although the Vista UDS tank itself is submersible, manyof the electrical components mounted to the tank are not.Special submersible components and wiring are providedwhen the UnderCover Style or Wet-Vault-Mounted Styleis specified. Contact your nearest S&C Sales Office forinformation on Pad-Mounted Style units with submersiblewiring.Pad-mounted enclosures meet the requirements ofANSI Standard C57.12.28 for enclosure integrity. The topof the enclosure is hinged on both sides for convenientaccess to the operating and termination compartments.A removable panel provides access to the elbows andcables and is secured by the overlapping padlockable top.A resilient closed-cell gasket on the enclosure bottomflange protects the finish from being scratched duringinstallation and isolates it from the alkalinity of a concretefoundation. Enclosures are protected from corrosion byS&C’s Ultradur® Finishing System.Motor Operators and SensingMotor operators provide the basis for automation. Therobust Vista motor operator is available factory-installed orit can be readily installed in the field. It is easily removedfor testing of the communication and control equipmentwithout actually operating the gear.Three-phase voltage sensing and three-phase currentsensing are available for motor operated ways.Low-Voltage Compartment EnclosureMotor operator controls are located within the low-voltagecompartment. Each motor operator is provided witha control board which includes “Close,” “Open,” and,optionally, “Ground” push buttons; switch-positionindicating lamps; operation counter; lamp test button;and receptacle for portable remote control station. Up tosix control boards can be accommodated, so any or allload-interrupter switches or three-pole fault interrupterways may be motor operated. A single “Local/Remote”switch is provided for all control boards, permitting anon-site operator to take complete control of the gear.A 36-volt, 5-ampere-hour, rechargeable, sealed-starvedelectrolytelead battery pack and 80-watt temperaturecompensatedoutput battery charger are also furnished inthe low-voltage compartment. The battery charger featuresintegral load-disconnect circuitry to prevent deep-dischargeof batteries on loss of ac source; alarms for loss of ac source,battery low voltage, and charger overvoltage; and a remoteor locally initiated battery test function. It provides both36-Vdc and 12-Vdc outputs. The battery charger requiresa 120-Vac, 50/60-Hz or 240-Vac, 50/60-Hz external powersupply; internal control power is optionally available.Connections are provided for the external power input;“close,” “open,” and, optionally, “ground” command inputs;switch-position indication; current- and voltage-sensoroutputs; and battery-test and battery-status outputs.Communication and Control EquipmentA user-specified remote terminal unit (RTU) and communicationdevice may be furnished in the low-voltagecompartment, providing a completely automated distributionswitching and protection package. Contact yournearest S&C Sales Office for details. Alternately, a controlunit for use with RTU by others or a control unit for usewithout RTU may be furnished. One of these three controlequipment packages must be specified when ordering. Seethe table on page 11.2 S&C Specification Bulletin 682-31
S&C Remote Supervisory Vista® Underground Distribution SwitchgearPotential Indication with Test FeatureWhen this optional voltage indication is specified, allroutine operating tasks—switching, voltage testing, andgrounding—can be accomplished by a single person withoutcable handling or exposure to medium voltage. This featureis available with or without provisions for low-voltagephasing. Cable testing for faults can be performed throughthe back of a user-supplied elbow or through a user-suppliedfeedthru insert, eliminating the need for cable handling oruse of parking stands.EXCLUSIONS: The purchaser must specify the switchgearstyle, communication and control equipment, motoroperator package, and any desired optional features tocomplete the catalog number of the switchgear.Communication devices, when specified, do not includeantenna, antenna support, surge protection, or coaxialfeedline. Propagation study, frequency selection, and FCClicense application are also to be provided by others.WARRANTY QUALIFICATIONS: The standard warrantycontained in seller’s standard conditions of sale (as set forthin Price Sheet 150) does not apply to major componentsnot of S&C manufacture, such as remote terminal unitsand communication devices, including hardware, software,resolution of protocol-related matters, and notification ofupgrades or fixes for those devices.Seller’s standard warranty does not apply to anycomponents not of S&C manufacture that are suppliedand installed by the purchaser, nor to the ability of seller’sequipment to work with such components.APPLICATION NOTES: Fault Interrupter—Completeratings for the fault interrupter are shown in the table onpage 4. In addition to the load-dropping ratings shown,the fault interrupter is capable of interrupting transformermagnetizing currents associated with the applicable loads,as well as line-charging and cable-charging currents typicalfor distribution systems of these voltage ratings.The duty-cycle fault-closing rating and ten-timeduty-cycle fault-interrupting rating shown for the faultinterrupter define, respectively, the level of availablethree-phase fault current into which the fault interrupter canbe closed the designated number of times in the “closed” or“grounded” position and subsequently interrupt, with thefault interrupter remaining operable and able to interruptrated continuous current.A Note on Single-Pole SwitchingIn single-pole switching of ungrounded-primary three-phasetransformers or banks (or single-phase transformersconnected line-to-line), circuit connections or parametersmay, in some cases, produce excessive overvoltages. Inparticular, for the following applications above 22 kV,single-pole switching should be performed only under theconditions stated in italics:• Switching unloaded or lightly loaded delta-connectedor ungrounded-primary wye-wye connected three-phasetransformers or banks (or line-to-line connected singlephasetransformers), rated 150 kVA or less three-phase,or 50 kVA or less single-phase—or of any kVA rating whencombined with unloaded cables or lines—where maximumsystem operating voltage exceeds 22 kV. Singlepoleswitching should be performed only if each phaseis carrying 5% load or more, or if the transformer orbank is temporarily grounded at the primary neutralduring switching.• Switching loaded or unloaded ungrounded-primary wyedeltaconnected three-phase transformers or banks—alone or combined with unloaded cables or lines—wheremaximum system operating voltage exceeds 22 kV.Single-pole switching should be performed only if eachphase is carrying 5% load or more and if the lightingloadphase is always switched open first (or switchedclosed last); or if the transformer or bank is temporarilygrounded at the primary neutral during switching.Load-Interrupter Switch—Complete ratings for theload-interrupter switch are shown in the table onpage 4. In addition to the load-dropping ratings shown,the load-interrupter switch is capable of interruptingtransformer magnetizing currents associated with theapplicable loads, as well as line-charging and cable-chargingcurrents typical for distribution systems of these voltageratings. For applications involving load current with highharmonic content (such as rectifier load currents), refer tothe nearest S&C Sales Office.The duty-cycle fault-closing rating shown for theload-interrupter switch defines the level of availablethree-phase fault current into which the load-interrupterswitch can be closed the designated number of times in the“closed” or “grounded” position, with the load-interrupterswitch remaining operable and able to interrupt ratedcontinuous current.S&C Specification Bulletin 682-31 3
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Specification Bulletin 682-31 - S&C Electric Company

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