1 / 3

Case Study - Importance of Relay Selection in Grid Connected Industries

Case Study - Importance of Relay Selection in Grid Connected Industries, System Protection.

systemprotection
Download Presentation

Case Study - Importance of Relay Selection in Grid Connected Industries

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ISO 9001:2015 ISO 45001:2015 (OH & S) Certified Company Case Study Importance of Relay Selection in Grid Connected Industries www.systemprotection.in +91-265-2225137

  2. Justlikeallothercases, webringyouone moreactualincidenthappenedrecentlyin oneoftheProcessIndustry, connectedwith GRID (StateUtility). Inour18yearsofservice toindustries, wehavecomeacrossmany abnormalities, incidentandhaveresolved them. Evenwelearnwhilesolvingthe issuesorTrippingincidentsbutsummation ofthesemanyyearsofexperiencehas strengthenustoresolvethistypeof incidentsintime. However, thisisthefirst timewecameacrossthiskindofissue. ThenweaskedRarecheck. Tochange thephasesequenceofIncomingVoltage supplyinrelayforallthecombinations asRYB, RBY, YRB, YBR, BYR, BRY. Tooursurprise!!!!! WithcombinationRBY, relaycontactgotresetandplantwas started. Wealsoaskedthemtocheckwithother plantconnectedtoGRIDwithsame feedersandfound: TheirMotorswererunninginReverse directionandsamehasleadstocertain issuesrelatedtoprocess. Adding additionaldowntime. Samewasissuewithotherplantsas well. Onalighternote, toourknowledge, mostof theabnormalities, Trippingoroperational problemsinIndustrieshappensonSunday orHolidaysonly. Keepinglegacyalive, this alsooccurredonSundayevening4PMin themonthofFeb2019. Theproblemwasidentifiedaschangein PhasesequencemistakenlybyGRIDside duringshutdown. Weadvisedplantpeople tokeeptheoriginalwiringsothatifthis happensagaininfuturethansamecanbe identifyandrectify. Here under is the summary: ItwasplannedshutdownfromGridside foraddingnew33kVdistributionlineto theirsubstation. Samewasinformedto alltheconsumers2weeksinadvance forthisshutdownwhichwasscheduled for2-3hoursincontinuation. Well, wegottheirappreciationasSystem ProtectionhasbeeninvolvedinSelection andRetrofittingofrelays. Iftheplanthas beenstartedwithreversedirectionmore revenuelosswouldhaveregistered. Allgoeswellasperschedule, Power resumedwithin2.5hoursbut…………. ConnectedIndustriesfailedtostart. Reason….? UnhealthyVoltage. Andrelay blockedCircuitbreakerstoclose pertainingtoUnhealthyVoltage. Proper Relay Selection for Equipment’s play a key role in Protecting your plant equipment in the best way. TherelaysensedthePhaseReversalas unhealthyvoltageandtherefore, wasgiving trippingcommands. Underpressure, maintenanceengineerBypassed Undervoltageprotectionandchargedthe panelashewasconcernedabout productionlost. ButwhenRelayisatfault youcan'tevenchangeordisablesetting, andthisisblessingindisguise. Then started troubleshooting: TheycheckedPTsupply, foundhealthy. Ifduringshutdown, anymodification/s ORChange/smadeinthewiring? No, everythingwasasitwas. Theytookallpossiblemeasures, but waste. Relaykeepissuingtripping command. OurteamduringannualRelaytestingin shutdown (July2018), suggestedand enabledthissetting. Worried about the incident, we got distressed call from user: Wefeelsorryfortheotherindustrieswho sufferedduetoimproperrelayselection. Damagehasalreadyoccurred. Toavoidthis westronglyrecommend, whileselecting protectiverelayseitherinProjectsor retrofitting, allthepointsmustbe consideredpertainingtoprotectionand processperspective. Weenquiredwiththemandasked whetherallnecessarymeasureshave beentaken. Weaskedthemtocheckinrelay configuration, butnotnecessarilyplant peopleknowsit. Weevenadvisedtoreboottherelay, ifin caseitmayhavehanged. www.systemprotection.in +91-265-2225137

  3. CONTACT INFORMATION 301/2/306, SilverlineComplex,OppositeBBC Tower,Sayajigunj,Vadodara - 390005, Gujarat, India. bdm@systemprotection.in www.systemprotection.in +91-265-2225137

More Related