Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology...
Transcript of Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology...
![Page 1: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/1.jpg)
Class1EProtection(UnbalancedVoltageRelays)
NRCPublicMeetingDecember7‐8,2016
1
Preston Cooper, TVA EngineeringTamatha Womack, TVA Engineering
![Page 2: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/2.jpg)
ProtectthefunctionalityofClass1Eequipmentfromunbalancedvoltage,includingthepresenceofanopen
phaseofconsequence.
Class1EUnbalancedVoltageProtectiveFunctionClass1EUnbalancedVoltageProtectiveFunction
2
![Page 3: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/3.jpg)
OpenPhasevs.UnbalancedVoltageOpenPhasevs.UnbalancedVoltage
3
• Anopenphaseeventcausesvoltageirregularities• Unbalancedvoltagesarealsocausedbyothereventsincludingbreakerfailures,gridunbalance,auxiliarysystemunbalance,etc.
• Voltageisadirectmeasurableparameterwhichcandeterminetheabilityofequipment tofunction.
![Page 4: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/4.jpg)
OffsitePowerConnectionsSequoyahNuclearPlant(SQN)
4
![Page 5: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/5.jpg)
SimplifiedOffsitePower(OSP)ConnectionsSimplifiedOffsitePower(OSP)Connections
OffsitePower OffsitePowerCircuit#1 Circuit#2
5
![Page 6: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/6.jpg)
TheClass1EsystemisimmediatelyconnectedtooneGDC17offsitepowersource(i.e.,notransferrequired)duringallmodesofoperation.
Including:• NormalOperation• UnitTrip/FullLoadRejection• DesignBasisAccident• UnitStartUp• UnitShutdown/Refuel
OffsitePowerConnectionDescriptionOffsitePowerConnectionDescription
6
![Page 7: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/7.jpg)
TVAUnbalanceVoltageRelayDesignBasis
7
![Page 8: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/8.jpg)
• Voltageunbalancecancauseseriousmotoroverheatingdamageduetonegativesequencecurrent(I2).
• NEMAMG‐1:– Motorscanwithstand1%voltageunbalance,shouldnotbeoperated
with>5%voltageunbalance– Above1%voltage,themotormustbede‐ratedduetoexcessheating
• Wellknowninverse‐timerelationshipbetweenvoltageunbalanceandmotorthermaldamage1
TVAUnbalanceVoltageRelayDesignBasisTVAUnbalanceVoltageRelayDesignBasis
8
1. Motor Temperature Estimation Incorporating Dynamic Rotor Impedance, IEEE Transactions on Energy Conversion, Vol. 6, No. 1, March 1991
![Page 9: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/9.jpg)
• Provide100%protectionagainstlossofsafetyfunctionduetounbalancedvoltagesatthesafety‐buses,includingupstreamopenphaseevents– Includingbothin‐plantandtransformeropenphaseevents
• Utilizeexistingundervoltageprotectioncircuits– Existingsensingcircuits(BusPTs)– Existinglogiccircuits(tripoffsitepower)– Minimalmodificationcosts
• UtilizerelaysqualifiedforClass1Euse– TVAchoosingABBType60QPhaseUnbalanceRelay
(negativesequenceovervoltage)duetoexperiencewithsimilarrelays
• Utilizebottom‐upsetpointmethodology
TVAUnbalanceVoltageRelayDesignBasisTVAUnbalanceVoltageRelayDesignBasis
9
![Page 10: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/10.jpg)
UnbalanceVoltageRelaySetpointMethodologyUnbalanceVoltageRelaySetpointMethodology
“LOSSOFLIFE”Protectsagainstlongtermmotordegradation:• SetpointbasedonANSIallowablevalues
• Timedelayallowsforclearinganticipatedgroundfaults
10
![Page 11: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/11.jpg)
UnbalanceVoltageRelaySetpointMethodologyUnbalanceVoltageRelaySetpointMethodology
“EVERYTHINGWORKS”Protectsagainstlossofsafetyfunctiononoffsitepower:• Nomotorstriponcurrent
(runningorstarting)• Nomotorstartfailure,
includingLOCAsequencing• Timedelaybasedonsafety
analysislimitforEDGstarttime
11
![Page 12: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/12.jpg)
UnbalanceVoltageRelaySetpointMethodologyUnbalanceVoltageRelaySetpointMethodology
“SURVIVE”Protectsabilitytosurvivetheunbalanceandtransferrequiredsafetyloadstoonsitesupply:• Nomotorstriponcurrent
(runningorstarting)• Timedelaybasedonsurvival
time@100%unbalance
12
![Page 13: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/13.jpg)
UnbalanceVoltageRelaysAddedtoExistingUndervoltageCircuits
UnbalanceVoltageRelaysAddedtoExistingUndervoltageCircuits
Voltage UnbalanceRelays (Type 60)
Undervoltage Relays(Type 27)
Trip
Permissive 1/2 Logic
13
![Page 14: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/14.jpg)
*SetpointsareTechSpecvalues
**ActivationofMCRindicationandtripfunctionrequireLARapproval
UnbalancedVoltageRelaySchemeUnbalancedVoltageRelayScheme
14
![Page 15: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/15.jpg)
UnbalanceVoltageRelays(ABB60Q):AlreadyQualifiedforClass1EUse
UnbalanceVoltageRelays(ABB60Q):AlreadyQualifiedforClass1EUse
15
![Page 16: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/16.jpg)
TVA’sUnbalanceVoltageRelaySetpoints
16
![Page 17: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/17.jpg)
UnbalanceVoltageRelaySetpointMethodology
UnbalanceVoltageRelaySetpointMethodology
Affect on Function Response Required
Red Limited allowable time since loss of function is imminent due to protective device actuation.
Automatic Response (< allowable manual action time)
Yellow Limited allowable time since heating may outpace protective relays. This will result in loss of equipment life.
Controlled Response (loss of life is gradual and equipment is functional)
Green Unlimited allowable time. No affect on equipment function. No response required (full capacity and capability)
17
![Page 18: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/18.jpg)
SQNAnalyticalLimitsSQNAnalyticalLimits
18
Relay
Voltage(Volts Line-Neutral Secondary)
Time Delay(Seconds)
Lower Limit Upper Limit Lower Limit Upper Limit
Alarm 0.9 *1.5 0.3 *3.0
Low Trip 1.5 *3.3 4.0 *10
High Trip 3.3 *20.0 3.0 *4.0
*designatedanalyticallimits
• Toavoidnuisanceactuations,thethreerelays’nominalpick‐upsettingsshouldbeascloseaspossibletotheupperlimits,accountingforassociatederrorsandtolerances.
• ThetimedelaysetpointsfortheLowTripandtheHighTriprelaysmustnotoverlapwiththeAlarmrelaytimedelaysetpoint,accountingforassociatederrorsandtolerances
![Page 19: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/19.jpg)
Class1ECompliancewithNRC’s4FunctionalRequirements
19
![Page 20: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/20.jpg)
• Class1Equalifiedprotectiverelays(ABB60Q)oneachtrain/division
• Permissive1outof2logicschemetoprovidereliability
• AnyfailureofacomponentistheClass1Efailureandthesecondtrainwillremainavailable,persinglefailurecriteria.
FunctionalRequirement1–SingleFailureFunctionalRequirement1–SingleFailure
20
![Page 21: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/21.jpg)
• AutomaticdetectionandMCRalarmoccursforallopenphaseeventsthatadverselyeffectconnectedsafetyloads– Automaticdetectionisavailableimmediatelyupon
connectiontoastandbyoffsitepowersource• Foropenphaseeventsthatdonotadverselyeffectconnectedsafetyloads,thestationwillremainontheadequateandcapableGDC‐17source.– OPCsonstandbysourcescanbedetectedinmeansother
thanautomatic• VisualinspectionscanoccurwithinallowableLCOtimeandstillmeettheintentoftheTechSpecsforoperabilityofoffsitepowersource.
• Consistentwithexistingdegradedvoltage/lossofvoltageprotectionschemes.
FunctionalRequirement2–AutomaticDetectionofOPCFunctionalRequirement2–AutomaticDetectionofOPC
21
![Page 22: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/22.jpg)
Consistentwithdegraded/lossofvoltageprotection• SetpointsensureClass1Eequipmentwillbeabletoprovidetheirsafetyfunctionunderallanticipatedoperationaloccurrences,includingaconcurrentdesignbasisevent.
• Timedelaysensurethepowersourceisautomaticallytransferredtotheonsitepowersystemwithinthetimeassumedintheaccidentanalysis.
FunctionalRequirement3–TimeDelayFunctionalRequirement3–TimeDelay
22
![Page 23: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/23.jpg)
UnbalancedVoltageTSLCOandSurveillanceRequirementswillbeconsistentwithexistingundervoltage(i.e.,DVR)• LossofPowerDieselGeneratorStartInstrumentation(TS3.3.5)isbeingmodified
• Newfunctionprovidedbytheunbalancedvoltagerelaysforinitiationofthedieselgenerators
FunctionalRequirement4–TechSpecsFunctionalRequirement4–TechSpecs
23
![Page 24: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/24.jpg)
Summary
24
![Page 25: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/25.jpg)
•UnbalancedvoltagemethodologyhasbeenvalidatedthroughfieldtestingatBellefonteNuclearPlant.•AllunbalancedvoltagerelayshavebeeninstalledatSQNwithouttripenabled.•Monitoringsetpointaresetsignificantlylowerandinsuchamannertoprovidegranularity.
SummarySummary
25
![Page 26: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/26.jpg)
• Relayshaveappropriatelyrespondedtoinplantandgridevents(e.g.,lighteningstrike,relaytesting,griddisturbance,boardtransfer,maingeneratorpowerchanges,etc.)
• Noeventhasoccurredthatwouldchallengethefinalsetpointsonceimplimented (i.e.,resultinatrip)
TVAFleetMonitoringSummaryTVAFleetMonitoringSummary
26
![Page 27: Class 1E Protection (Unbalanced Voltage Relays) · Unbalance Voltage Relay Setpoint Methodology “SURVIVE” Protects ability to survive the unbalance and transfer required safety](https://reader031.fdocuments.us/reader031/viewer/2022040922/5e9b689da29cac50a205ed2c/html5/thumbnails/27.jpg)
Questions
27