Relationship marketing class lectures_225232940-Theory-Lectures

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Theory TrackTransmission Protection TheorySymmetrical Components &Fault CalculationsHands-On Relay SchoolJon F. DaumeBonneville Power AdministrationMarch 14-15, 20111Class OutlinePower system troublesSymmetrical componentsPer unit systemElectrical equipment impedancesSequence networksFault calculations2Power System ProblemsFaultsEquipment troubleSystem disturbances3Fault CausesLightningWind and iceVandalismContaminationExternal forcesCars, tractors, balloons, airplanes, trees, critters,flying saucers, etc.Equipment failuresSystem disturbancesOverloads, system swings45Fault TypesOne line to ground (most common)Three phase (rare but most severe)Phase to phasePhase to phase to ground6SymmetricalComponents7Balanced & Unbalanced SystemsBalanced System:3 Phase load3 Phase faultUnbalanced System:Phase to phase faultOne line to groundfaultPhase to phase toground faultOpen pole orconductorUnbalanced load8Balanced & Unbalanced SystemsCCAABBalancedSystemBUnbalanced System9Sequence Currents forUnbalanced NetworkIb0Ia0Ic1Ic0Zero SequenceIa1Ia2Ib2Positive SequenceIc2Negative SequenceIb110Sequence QuantitiesCondition+-03 Phase load3 Phase faultPhase to phase faultOne line to ground faultTwo phase to ground faultOpen pole or conductorUnbalanced loadDDDDDDDDDDDDDDDD11Phase Values From SequenceValuesCurrents:IA = Ia0 + Ia1 + Ia2IB =

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