{
  "meta":{"mode":"optimize","requestedSections":["frame","no-load","lv","hv","performance","tank"],"completedSections":["frame","no-load","lv","hv","performance","tank"],"benchmark":"Kenya Power 2025, 11/0.420 kV"},
  "input":{"kva":630,"hvVoltage":11000,"lvVoltage":415,"phases":3,"frequency":50,"hvConnection":"Delta","lvConnection":"Star","connectionCode":"Dy11","vectorClock":11,"cooling":"ONAN","targetTemperatureRiseC":50,"referenceTemperatureC":75,"coreFluxDensityT":1.6,"averageCurrentDensity":2.6,"windowAspectRatio":3},
  "assumptions":{"coreStepFactor":0.6,"emfValueFactor":0.6,"stackingFactor":0.9,"yokeAreaFactor":1.15,"yokeWidthFactor":0.9,"windowSpaceMultiplier":1.15,"dimensionRoundingM":0.001,"coreLossReferenceFluxT":1.6,"coreLossReferenceWKg":1.4,"yokeLossReferenceFluxT":1.33,"yokeLossReferenceWKg":1.02,"lossCurveExponent":2,"ironLossBuildFactor":1,"coreATPerM":200,"yokeATPerM":110,"excitationBuildFactor":1.15,"conductorInsulationMm":0.4,"copperResistivity20":0.01724,"copperTemperatureConstant":235,"copperStrayLossFactor":1.05,"copperDensityKgM3":8960,"steelDensityKgM3":7850,"oilDensityKgM3":860,"lvWindingHeightFraction":0.8,"lvEdgeFactor":0.9702,"lvInterTurnInsulationMm":2,"lvEndInsulationMm":100,"lvRadialInsulationMm":1.8,"hvWindingHeightFraction":0.7,"hvEdgeFactor":0.98,"hvInterCoilInsulationMm":6,"hvEndRingMm":30,"hvEndInsulationMm":100,"coreToLvOilDuctMm":5,"coreToLvCylinderMm":3,"lvFormerToWindingDuctMm":5,"lvToHvOilDuctMm":5,"lvToHvCylinderMm":6,"hvFormerToWindingDuctMm":5,"plainTankDissipationWm2C":12.5,"tubeCoefficientWm2C":6.5,"tubeEffectiveness":1.35,"tankPlateThicknessM":0.008,"copperCostIndex":8,"coreSteelCostIndex":2.4,"tankSteelCostIndex":1.2,"oilCostIndex":1},
  "summary":{"ironLossW":1117.4295,"loadLossW":7794.2297,"totalLossW":8911.6592,"fullLoadEfficiencyPercent":98.605181,"impedancePercent":9.2253998,"regulation85Percent":5.867485,"temperatureRiseC":49.904245,"coolingTubes":62,"activeMassKg":1083.0231,"shippingMassKg":2433.5578},
  "sections":{
    "frame":{"voltsPerTurn":8.6961485,"netCoreAreaM2":0.0244824,"grossCoreAreaM2":0.027202667,"coreDiameterM":0.202,"windowSpaceFactor":0.2804878,"windowAreaM2":0.13245398,"coreLengthM":0.631,"centreDistanceM":0.412,"windowRatio":3.0047619,"yokeLengthM":1.006,"yokeGrossAreaM2":0.031283067,"yokeWidthM":0.1818,"yokeHeightM":0.17207407,"coreFluxDensityT":1.6,"yokeFluxDensityT":1.3913043,"coreLossWPerKg":1.4,"yokeLossWPerKg":1.1161978,"coreMassKg":404.23299,"yokeMassKg":494.09101,"coreIronLossW":565.92618,"yokeIronLossW":551.50332,"ironLossW":1117.4295,"totalIronMassKg":898.324,"totalIronVolumeM3":0.11443618},
    "noLoad":{"coreATPerM":200,"yokeATPerM":110,"coreAmpereTurns":378.6,"yokeAmpereTurns":221.32,"totalATPerPhase":199.97333,"lvTurns":28,"lvPhaseVoltageV":239.60036,"lvPhaseCurrentA":876.45944,"wattfulCurrentA":1.554574,"magnetizingCurrentA":5.8076027,"noLoadCurrentA":6.012067,"noLoadCurrentPercent":0.68594925},
    "lv":{"phaseVoltageV":239.60036,"turns":28,"phaseCurrentA":876.45944,"availableWindingHeightMm":504.8,"turnsRadially":7,"turnsAxially":4,"parallelStrands":18,"axialStrands":6,"radialStrands":3,"spacePerTurnMm":126.2,"strandWidthMm":20,"strandThicknessMm":1,"nominalConductorAreaMm2":360,"conductorAreaMm2":349.272,"currentDensity":2.5093894,"activeHeightMm":497.6,"occupiedHeightMm":597.6,"axialSlackMm":33.4,"radialWidthMm":31.2,"innerDiameterMm":228,"outerDiameterMm":290.4,"meanTurnLengthM":0.81430082,"conductorLengthM":22.800423,"copperVolumeM3":0.0079635493,"copperMassKg":71.353402,"resistance20Ohm":0.0011254246,"resistanceReferenceOhm":0.0013681632,"copperLoss20Kw":2.5935898,"copperLossReferenceKw":3.1529916},
    "hv":{"phaseVoltageV":11000,"turns":1286,"phaseCurrentA":19.090909,"availableWindingHeightMm":441.7,"coils":12,"middleCoilTurns":112,"endCoilTurns":83,"parallelStrands":1,"axialStrands":4,"radialStrands":28,"spacePerCoilMm":36.808333,"strandWidthMm":8,"strandThicknessMm":1,"nominalConductorAreaMm2":8,"conductorAreaMm2":7.84,"currentDensity":2.4350649,"activeHeightMm":469.2,"occupiedHeightMm":599.2,"axialSlackMm":31.8,"radialWidthMm":39.2,"innerDiameterMm":322.4,"outerDiameterMm":400.8,"adjacentClearanceMm":11.2,"meanTurnLengthM":1.1359999,"conductorLengthM":1460.8959,"copperVolumeM3":0.011453424,"copperMassKg":102.62268,"resistance20Ohm":3.2124802,"resistanceReferenceOhm":3.9053681,"copperLoss20Kw":3.5124887,"copperLossReferenceKw":4.2700843},
    "performance":{"lvCopperLoss20Kw":2.5935898,"hvCopperLoss20Kw":3.5124887,"lvCopperLossReferenceKw":3.1529916,"hvCopperLossReferenceKw":4.2700843,"copperLoss20Kw":6.4113825,"copperLossReferenceKw":7.7942297,"ironLossKw":1.1174295,"totalLossKw":8.9116592,"maxEfficiencyLoadKva":238.54154,"maxEfficiencyPercent":98.909799,"meanTurnLengthM":0.97515036,"coilLengthM":0.4692,"ampereTurnsPerPhase":24550.909,"resistancePu":0.012371793,"reactancePu":0.09142067,"impedancePu":0.092253998,"regulation85Pu":0.05867485,"regulationUnityPu":0.012371793,"cases":[{"powerFactor":1,"loadPu":1,"lossKw":8.9116592,"outputKw":630,"inputKw":638.91166,"efficiencyPercent":98.605181},{"powerFactor":0.85,"loadPu":1,"lossKw":8.9116592,"outputKw":535.5,"inputKw":544.41166,"efficiencyPercent":98.363066},{"powerFactor":0.85,"loadPu":0.75,"lossKw":5.5016837,"outputKw":401.625,"inputKw":407.12668,"efficiencyPercent":98.648656},{"powerFactor":0.85,"loadPu":0.5,"lossKw":3.0659869,"outputKw":267.75,"inputKw":270.81599,"efficiencyPercent":98.867871}]},
    "tank":{"lengthClearanceM":0.14,"widthClearanceM":0.18,"heightClearanceM":0.5,"tubeDiameterM":0.05,"tubeHeightM":1.25,"targetRiseC":50,"lengthM":1.3648,"widthM":0.5808,"heightM":1.4751481,"volumeM3":1.1693143,"surfaceAreaM2":5.7400965,"plainRiseC":124.20222,"cooledRiseC":49.904245,"tubeAreaM2":0.19634954,"requiredTubeAreaM2":12.134698,"coolingTubes":62,"hvCopperMassKg":102.62268,"lvCopperMassKg":71.353402,"ironMassKg":898.324,"activeMassKg":1083.0231,"specificMassKgKva":1.7190842,"steelMassKg":460.03814,"oilVolumeM3":1.0354611,"oilMassKg":890.49659,"shippingMassKg":2433.5578,"materialCostIndex":4990.3286}
  },
  "billOfMaterials":[{"item":"HV copper","massKg":102.62268},{"item":"LV copper","massKg":71.353402},{"item":"Active core steel","massKg":898.324},{"item":"Fabricated tank steel","massKg":460.03814},{"item":"Insulating oil","massKg":890.49659}],
  "evaluations":[{"id":"window_ratio","label":"Core window proportion","value":3.0047619,"unit":"ratio","limitLow":2.5,"limitHigh":4,"status":"PASS","source":"Academic design rule","meaning":"L/(D-d) checks whether the magnetic window is sensibly proportioned.","verdict":"Inside the 2.5 to 4.0 design band."},{"id":"no_load_current","label":"No-load current","value":0.68594925,"unit":"%","limitLow":0.5,"limitHigh":1,"status":"PASS","source":"Academic design rule","meaning":"Excitation current as a percentage of rated LV phase current.","verdict":"Inside the textbook 0.5 to 1.0 percent band."},{"id":"lv_current_density","label":"LV current density","value":2.5093894,"unit":"A/mm2","limitLow":2.3,"limitHigh":3.5,"status":"PASS","source":"Academic design rule","meaning":"Copper loading determines conductor heating and material use.","verdict":"Within the selected transformer-design band."},{"id":"lv_slack","label":"LV axial slack","value":33.4,"unit":"mm","limitLow":7,"limitHigh":1e+09,"status":"PASS","source":"Academic design rule","meaning":"Remaining axial allowance for insulation and assembly tolerance.","verdict":"At least 7 mm remains."},{"id":"hv_current_density","label":"HV current density","value":2.4350649,"unit":"A/mm2","limitLow":2.3,"limitHigh":3.5,"status":"PASS","source":"Academic design rule","meaning":"Copper loading determines conductor heating and material use.","verdict":"Within the selected transformer-design band."},{"id":"hv_slack","label":"HV axial slack","value":31.8,"unit":"mm","limitLow":7,"limitHigh":1e+09,"status":"PASS","source":"Academic design rule","meaning":"Remaining height after coils, end ring and insulation are placed.","verdict":"At least 7 mm remains."},{"id":"inter_winding_clearance","label":"Adjacent HV winding clearance","value":11.2,"unit":"mm","limitLow":15,"limitHigh":1e+09,"status":"FAIL","source":"Academic design rule","meaning":"Clearance between adjacent HV winding envelopes on neighbouring limbs.","verdict":"Winding envelopes are too close."},{"id":"kplc_no_load_loss","label":"No-load loss vs local benchmark","value":1117.4295,"unit":"W","limitLow":0,"limitHigh":680,"status":"FAIL","source":"Kenya Power 2025, Table 6","meaning":"Core loss compared with the interpolated 11/0.420 kV utility benchmark.","verdict":"Above the local benchmark; improve core material or flux selection."},{"id":"kplc_load_loss","label":"Load loss at reference temperature","value":7794.2297,"unit":"W","limitLow":0,"limitHigh":5600,"status":"FAIL","source":"Kenya Power 2025, Table 6","meaning":"Copper and stray loss corrected to the configured reference temperature.","verdict":"Above the local benchmark; review conductor area and current density."},{"id":"kplc_total_loss","label":"Total loss vs local benchmark","value":8911.6592,"unit":"W","limitLow":0,"limitHigh":6280,"status":"FAIL","source":"Kenya Power 2025, Table 5","meaning":"Full-load loss at unity power factor, compared with the local rating curve.","verdict":"Does not meet the local total-loss benchmark."},{"id":"kplc_impedance","label":"Short-circuit impedance","value":9.2253998,"unit":"%","limitLow":3.6,"limitHigh":4.4,"status":"FAIL","source":"Kenya Power 2025, Table 5","meaning":"Impedance affects fault current and voltage regulation.","verdict":"Calculated 9.23% against a 4.00% local benchmark target."},{"id":"full_load_efficiency","label":"Full-load efficiency at unity PF","value":98.605181,"unit":"%","limitLow":0,"limitHigh":100,"status":"INFO","source":"Calculated result","meaning":"Useful output divided by electrical input at rated load.","verdict":"Higher is better; loss limits provide the formal local comparison."},{"id":"temperature_rise","label":"Calculated oil temperature rise","value":49.904245,"unit":"C","limitLow":0,"limitHigh":50,"status":"PASS","source":"Configured thermal target / IEC 60076-2 context","meaning":"Estimated steady rise after the calculated cooling tubes are included.","verdict":"Cooling area holds the estimate within the target."},{"id":"oil_volume","label":"Usable oil volume","value":1.0354611,"unit":"m3","limitLow":0,"limitHigh":1e+09,"status":"PASS","source":"Calculated geometry","meaning":"Tank volume remaining after active-material displacement.","verdict":"Positive oil volume is available."}],
  "optimization":{"evaluatedDesigns":294,"feasibleDesigns":7,"recommendedIndex":0,"candidates":[{"bm":1.7,"currentDensityTarget":2.6,"windowAspectRatio":2.8,"totalLossW":8809.292,"activeMassKg":1012.6675,"materialCostIndex":4765.7973,"efficiencyPercent":98.620982,"impedancePercent":9.0442363,"temperatureRiseC":49.849066,"benchmarkPassCount":0,"balanceScore":0}]}
}