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22.4Metering Devices, Protective Relays, Software and ConnectivityProtective Relays222222222222222222222222222222222222222222222222222222222222EDR-3000ContentsDescriptionPageProduct Selection Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 282FP-6000 Feeder Protection . . . . . . . . . . . . . . . . . . . . . . . . . 286FP-5000 Feeder Protection . . . . . . . . . . . . . . . . . . . . . . . . . 296FP-4000 Feeder Protection . . . . . . . . . . . . . . . . . . . . . . . . . 304MP-3000 Motor Protection . . . . . . . . . . . . . . . . . . . . . . . . . 312MP-4000 Motor Protection . . . . . . . . . . . . . . . . . . . . . . . . . 322MD-3000 Motor/Generator Differential Relay . . . . . . . . . . . 328Digitrip 3000. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331VR-300 Multifunctional Voltage Relay . . . . . . . . . . . . . . . . . 341DP-300 Current Differential Protection Relay. . . . . . . . . . . . 345EDR-3000 Feeder ProtectionFeatures, Benefits and Functions . . . . . . . . . . . . . . . . . . 352Standards and Certifications . . . . . . . . . . . . . . . . . . . . . . 352Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . 353Technical Data and Specifications . . . . . . . . . . . . . . . . . . 354Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359ETR-4000 Transformer Protection Relay . . . . . . . . . . . . . . . 361Ground Fault Relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374Universal RTD Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378IQ 125 Volt DC Power Supply . . . . . . . . . . . . . . . . . . . . . . . 382EDR-3000 Feeder ProtectionProduct DescriptionThe EDR-3000 ProtectiveRelay is a multifunction,microprocessor-basedovercurrent relay designedfor both ANSI and IECapplications. It is a panelmounted,self-contained unitthat operates from either ACor DC control power. TheEDR-3000 design providestrue rms and fundamentalsensing of each phase andground current. Only one unitis required for each threephasecircuit.Current monitoring andoperator selectable protectivefunctions are integral to eachrelay. The EDR-3000 relayoperates from the 5A or 1Asecondary output of standardcurrent transformers. Currenttransformer ratio informationis quickly programmed intothe unit via settings. Thisenables the relay to displaymetered current in primaryamperes, secondary amperesor per unit values. The EDR-3000 features a user-friendlyoperations panel to monitorand program the relay.Operating parameters andtroubleshooting informationare displayed in the 128 x 64LCD. In addition, all data andinformation can becommunicated to a hostcomputer equippedwith PowerPort-E.A “Communication Trip” and“Communication Close”control command can also beinitiated by a host computerwith an authorized accesscode for remote breakeroperation.Application DescriptionThe EDR-3000microprocessor-based relayprovides reliable three-phaseand ground overcurrentprotection for all voltagelevels. It can be used forany application whereinstantaneous and/or timeovercurrent protection isrequired. It is mostcommonly used as primaryfeeder circuit protection,shown below.Primary Feeder CircuitProtection50 5150G 51GCB52 EDR-3000LoadThe EDR-3000 may beapplied as the transformerprimary protection or asbackup to the differentialprotection, see below.Transformer OvercurrentProtectionCB50 5150G51GEDR-3000The EDR-3000 may beconnected to the secondaryside of a delta-wye groundedtransformer with the groundelement connected to aseparate CT in the neutralconnection of thetransformer. With thisconnection, a lower CTratio and a pickup settingcan be used to providemore sensitive ground faultprotection especially forresistance groundedsystems, shown below.Transformer SecondaryProtection with Neutral CTConnectionCB50G51G50 51EDR-3000ResistorThe EDR-3000 relay hasspecial provisions forconnection in a ZoneInterlocking scheme that canbe used for bus protectionor to improve protectioncoordination in a tight or closesystem. Zone Interlockingis described in followingsections. In addition theEDR-3000 has multiplesetting groups that can beused to reduce arc flashhazard with instantaneouselements.Residual Ground ConnectionCB-52abc25836950/5150N/51NGND 12 11EDR-3000350 Volume 3—Power Distribution and Control Assemblies CA08100004E—December 2010 www.eaton.com
Metering Devices, Protective Relays, Software and ConnectivityProtective Relays22.4Overcurrent ProtectionThe EDR-3000 providescomplete three-phase andground protection withseparate elements andsettings. The relay can beused with CTs from 1 to50,000A of primary currentand 1 or 5A of secondarycurrent. The CT ratio can beset independently for phaseand ground, allowing theground element to beconnected in either theresidual or the separateground CT configuration,shown on below.Separate Zero SequenceGround CT ConnectionCB-52abcGND2 35 68 950/5150G/51G11 12EDR-3000Zone Selective Interlocking(Phase and Ground)Note: Refer to the OrderingInformation and (Catalog OrderingInformation) for optional features,see Page 353.Zone Selective interlockingis a protection function tominimize equipment damageresulting from a phase or aground fault in an area wherelong time and/or short timedelay is in use.When the “Ground ZoneInterlocking” feature isutilized, an immediate trip isinitiated when the fault is inthe breaker’s zone ofprotection, regardless of itspreset time delay. When the“Phase Zone Interlocking”feature is utilized, the timeovercurrent elements workas follows. The instantaneousphase element will initiate animmediate trip when the faultis in the breaker's zone ofprotection, regardless of itspreset time delay. For thetime overcurrent phaseelement, the current sensedby the EDR-3000 mustexceed 1.5 times the pickupsetting for the zone selectiveinterlocking to initiate animmediate trip signal whenthe fault is in the breaker’szone of protection.Upstream EDR-3000protected breakers arerestrained from trippingimmediately by aninterlocking signal from thedownstream EDR-3000 relay.This interlocking signalrequires only a pair ofwires from the downstreambreaker to the upstreambreaker. It provides standardcoordinated tripping whenthe fault is located outsidethe zone of protection.In the sample zoneinterlocking system shownbelow, circuit breakers A,B and C are equipped withEDR-3000 overcurrent relays.Fault Location Zone 3Note: For the time overcurrentphase element, the currentsensed by the EDR-3000 mustexceed 1.5 times the pickupsetting for the zone selectiveinterlocking to initiate animmediate trip signal whenthe fault is in the breaker's zoneof protection.If a fault occurs at a pointin Zone 3, the EDR-3000of downstream breaker Csenses the fault and sendsa restraining signal to theupstream EDR-3000 offeeder breaker B. Havingreceived this signal, theEDR-3000 of feeder breakerB withholds its tripcommand. As a result, onlydownstream breaker C istripped.Fault Location Zone 2Note: For the time overcurrentphase element, the currentsensed by the EDR-3000 mustexceed 1.5 times the pickupsetting for the zone selectiveinterlocking to initiate animmediate trip signal when thefault is in the breaker’s zoneof protection.If a fault occurs at a point inZone 2, the EDR-3000 offeeder breaker B senses thefault and sends a restrainingsignal to the upstream EDR-3000 of main breaker A. TheEDR-3000 of the downstreambreaker C does not see thisfault since it is situated on thedownstream side of the fault.As a result, the EDR-3000 ofdownstream breaker C doesnot send a restraining signalto the EDR-3000 of feederbreaker B. Since it did notreceive a restraining signalfrom the EDR-3000 ofdownstream breaker C, theEDR-3000 of feeder breakerB identifies that the fault is inZone 2 and immediately tripsfeeder breaker B, regardlessof its time setting.Fault Location Zone 1Note: For the time overcurrentphase element, the currentsensed by the EDR-3000 mustexceed 1.5 times the pickupsetting for the zone selectiveinterlocking to initiate animmediate trip signal when thefault is in the breaker's zone ofprotection.If a fault occurs in Zone 1,no restraining signal isreceived by the Digitripof main breaker A. As aresult, main breaker A isimmediately tripped by itsEDR-3000 overcurrent relay,regardless of its time setting.222222222222222222222222222222222222222222222222222222222222Sample Zone Selective Interlocking SystemVolume 3—Power Distribution and Control Assemblies CA08100004E—December 2010 www.eaton.com 351
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