Eaton NOVA STS-15 Installation And Operation Instructions Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

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Eaton NOVA STS-15 Installation And Operation Instructions Manual Manual pdf 13 page image

8NOVA™ STS Single-Tank,Triple-Single,Electronically ControlledRecloserINSTALLATION AND OPERATION INSTRUCTIONS MN280046EN May 2016Grounding with a remote supply voltagetransformere: 4-wire multi-grounded, 3-wireungrounded, or impedance-groundedInstallation with a remote supply voltage transformer mustinclude the following (refer to Figure 9):●● Protection of the recloser bushings and the supplyingtransformer with lightning arresters.●● Grounding of the recloser head and tank.●● Grounding of the transformer tank.●● Grounding of the control cabinet.●● Grounding of the SCADA equipment.Ground TiePoleSurgeArresterSupply Voltage(12 gauge minimum)ArresterGroundSurgeArresterForm 6ControlPoleACNEUGRDNEUACInput TerminalBlockControl Cable(s)ArresterGroundCustomer Ground Connectionat external lugSurgeArresterNOVA STSRecloserRecloserGroundConnectorTransformerPole Ground(6 gauge minimum)NOTE: Distance betweentransformer and reclosershould be one pole spanor less.Figure 9 Recommended grounding method for NOVASTS recloser with Form 6-TS microprocessor-basedrecloser controlRecloser operationWARNINGThis equipment is not intended to protect humanlife Follow all locally approved procedures and safetypractices when installing or operating this equipmentFailure to comply can result in death, severe personalinjury, and equipment damage G102 1WARNINGHazardous voltage Do not rely on the open positionof the yellow operating handle or the contact positionindicator; it does not ensure that the line has beende-energized Always establish a visible disconnectFailure to follow proper safety practices can result incontact with high voltage, which will cause death orsevere personal injury G114 1A current transformer senses line current from each phaseof the NOVA STS recloser and inputs this information to theForm 6 Triple-Single microprocessor-based recloser control.The recloser responds to trip and close commands fromthe control per the settings programmed in the control.Refer to Service Information S280-70-7 Form 6 Triple-Single, Microprocessor-Based Pole Mount Recloser ControlInstallation and Operation Instructions for control operationinformation.Vacuum interrupterArc interruption takes place within the sealed vacuuminterrupter. Eaton’s Cooper Power series vacuuminterrupters employ axial-magnetic field contacts. Slots aremachined into the contact support structure producing amagnetic field along the axis of the interrupter. This axial-magnetic field keeps the arc in an easier-to-interrupt diffusemode, resulting in less power in the arc that needs to bedissipated, resulting in extended operating duty.Mechanism tripping and closingThe NOVA STS recloser is comprised of three single-phase NOVA reclosers. Each recloser utilizes a magneticactuator for fast, efficient latching. A rare-earth neodymiummagnet provides latching forces in excess of 240 pounds,eliminating the need for mechanical latches.While in the closed position, the magnetic field establishedby the magnet is coupled with the iron assembly to providea latching force for the movable plunger. The magneticforce is concentrated at the plunger-assembly interface andprovides the latching force required to keep the mechanismclosed. The assembly also houses the trip and close coilsthat provide the energy to operate the mechanism.To open the main contacts, the trip coil is pulsed withelectrical current, which cancels the magnetic field. Acompression spring in the center of the coil moves theplunger assembly to the open position. As the plungermoves, the magnetic field strength decreases as the air gapincreases, due to the difference in the relative permeabilityof free space and the ferrous plunger. Once in the openposition, the compression spring keeps the unit open.A trip and close capacitor stores the necessary energy foroperating the recloser. As a result, trip energy is availablefollowing any close operation. This capacitor is charged bythe control nominal 24 V battery and/or power supply.