Development & TechnologiesSQUARE D MONROE ELECTRICAL SYSTEMDuke(2) 2000 kVA1000 kVA75kVAStage 1Stage 2Stage 3DukeEnergy24940V4160VMV Liquid Filled24940: 4160GrdY / 2400 V4160: 480GrdY / 277 VMV Dry480VLV DryOfficeComputersandPeripherals480: 208GrdY / 120V24940:4160GrdY/2400V4160:480GrdY/277V480:208GrdY/120VOther MV Dry TransformersOther LV Dry TransformersFigure 11Development & TechnologiesMonroe Plant Typical Load Cycle0 50.60.70.8

a dRMS LoadActual PU Load0.10.20.30.40.5

PU Lo aFriday Saturday Sunday Monday Tuesday Wednesday Thursday00.1 

# 07/13/00 06:00: 0 07/13/00 09:00: 0 07/14/00 12:00: 0 07/14/00 03:00: 0 07/14/00 06:00: 0 07/14/00 09:00: 0 07/14/00 12:00: 0 07/14/00 03:00: 0 07/14/00 06:00: 0 07/14/00 09:00: 0 07/15/00 12:00: 0 07/15/00 03:00: 0 07/15/00 06:00: 0 07/15/00 09:00: 0 07/15/00 12:00: 0 07/15/00 03:00: 0 07/15/00 06:00: 0 07/15/00 09:00: 0 07/16/00 12:00: 0 07/16/00 03:00: 0 07/16/00 06:00: 0 07/16/00 09:00: 0 07/16/00 12:00: 0 07/16/00 03:00: 0 07/16/00 06:00: 0 07/16/00 09:00: 0 07/17/00 12:00: 0 07/17/00 03:00: 0 07/17/00 06:00: 0 07/17/00 09:00: 0 07/17/00 12:00: 0 07/17/00 03:00: 0 07/17/00 06:00: 0 07/17/00 09:00: 0 07/18/00 12:00: 0 07/18/00 03:00: 0 07/18/00 06:00: 0 07/18/00 09:00: 0 07/18/00 12:00: 0 07/18/00 03:00: 0 07/18/00 06:00: 0 07/18/00 09:00: 0 07/19/00 12:00: 0 07/19/00 03:00: 0 07/19/00 06:00: 0 07/19/00 09:00: 0 07/19/00 12:00: 0 07/19/00 03:00: 0 07/19/00 06:00: 0 07/19/00 09:00: 0 07/20/00 12:00: 0 07/20/00 03:00: 0 07/20/00 06:00: 0 07/20/00 09:00: 0 07/20/00 12:00: 0 07/20/00 03:00: 0 07/20/00 06:00: 0 07/20/00 09:00: 0 07/21/00 12:00: 0 07/21/00 03:00: 0 07/21/00 06:00: 0 07/21/00 09:00: 0 07/21/00 12:00: 0

0 0 PM 0 0 PM 0 0 AM 0 0 AM 0 0 AM 0 0 AM 0 0 PM 0 0 PM 0 0 PM 0 0 PM 0 1 AM 0 0 AM 0 0 AM 0 0 AM 0 0 PM 0 0 PM 0 0 PM 0 0 PM 0 0 AM 0 0 AM 0 0 AM 0 0 AM 0 0 PM 0 0 PM 0 1 PM 0 0 PM 0 0 AM 0 1 AM 0 0 AM 0 1 AM 0 1 PM 0 0 PM 0 0 PM 0 0 PM 0 0 AM 0 0 AM 0 0 AM 0 0 AM 0 0 PM 0 1 PM 0 0 PM 0 0 PM 0 0 AM 0 0 AM 0 0 AM 0 1 AM 0 0 PM 0 0 PM 0 0 PM 0 1 PM 0 0 AM 0 0 AM 0 1 AM 0 0 AM 0 0 PM 0 0 PM 0 0 PM 0 0 PM 0 1 AM 0 0 AM 0 0 AM 0 0 AM 0 0 PMTime & Day2Development & Technologies3Figure 3: 1000 kVA Substation4 Power Quality ReadingsSchne·derElectricTime:11:29:39Date:8/23/2000Development & TechnologiesTable1:Substation4PowerQualityAnalysis 8 232000Harmonic Current In rms amperes Current,% of TotalFundamental102.4299.9512 0.28 0.2733 1.34 1.308Table1:Substation4PowerQualityAnalysis-8-23-20004 0.07 0.0685 2.21 2.1576 0.07 0.0687 0.56 0.5478 0.06 0.05990 10 146.5.100.080.078110.110.107120.090.088130.20.195140 050 049..150.060.059160.040.039170.090.088180.050.049190.10.098200.070.068210.060.059220.020.020230.060.059240.080.0784Total rms amps102.47Development & TechnologiesFigure 4: Substation 4 Instantaneous Voltage and Current Traces on 4160 VPrimary5Development & TechnologiesFigure 5:Power Quality Readings on Lighting Panel 32 @ 480 VFigure5PowerQualityReadingsonLightingPanel32@480V6PowerQualityReadingsDevice:LP32Time:11:30:22Date:8/23/2000PhaseAPhaseBPhaseC3-PhaseTotal3.42.92.2N/AI1111.265.616.30.31.35.40.31.15.70.30.95.60.4.•.•••.••.•.•.......•..••..•••.•.•......••...-1•0.•.0-1.....0.2-20.....3Development & TechnologiesFigure 6: LightingPanel 32 Instantaneous Voltage and Current Traces7Development & TechnologiesFi 7I Vl dC LVl 7kgure7a:nstantaneousVotage andurrent onLowVotage75VADryType Secondaryat 11:17 a.m. on 10/4/00Ph APh A N--5305310517335066PhaseA--8408416817335066PhaseA-N-240244817 33 50 66Phase B-8308316617335066Phase B-N3467Phase C-48-2483167Phase C-N--83-67-34017 33 50 66--830173350668Development & TechnologiesFigure 7b: Instantaneous Voltage and Current on Low Voltage 75 kVADryType Secondaryat 12:00p.m. on 10/4/00-05101356Phase A-08161356Phase A-N0361356Phase B-08161356Phase B-N-37Phase C--1356816Phase C-N--1356--031356--0813569Development & TechnologiesT bl 2I C H i f 11 17 10/4/00Square D Monroe Low Voltage Transformer Office Load Analysis on 208Y/120V Output of 75 kVA T3H Transformerby PJ Hopkinson 10/4/00Ia= 44.09 Ib= 19.66 Ic= 26.87A t31 90E l15 31%L dPhase APhase BPhase CTable2:InstantCurrentHarmonicsfrom11:17a.m. on10/4/00Average rms current, amps31.90Equals15.31%Loadh Ih Ih(pu)h^2*(Ih(pu))^h Ih Ih(pu)h^2*(Ih(pu))^h Ih Ih(pu) ^2*(Ih(pu))^1.00 34.51 0.78 0.61 1.00 16.86 0.86 0.74 1.00 20.66 0.77 0.592.00 0.03 0.00 0.00 2.00 0.09 0.00 0.00 2.00 0.14 0.01 0.003.00 23.30 0.53 2.51 3.00 7.11 0.36 1.18 3.00 13.75 0.51 2.364.00 0.15 0.00 0.00 4.00 0.06 0.00 0.00 4.00 0.14 0.01 0.005.00 13.40 0.30 2.31 5.00 5.87 0.30 2.23 5.00 9.10 0.34 2.876.00 0.14 0.00 0.00 6.00 0.01 0.00 0.00 6.00 0.21 0.01 0.007.00 4.67 0.11 0.55 7.00 3.50 0.18 1.55 7.00 4.33 0.16 1.278.00 0.04 0.00 0.00 8.00 0.06 0.00 0.00 8.00 0.08 0.00 0.009.00 1.43 0.03 0.09 9.00 1.85 0.09 0.72 9.00 1.29 0.05 0.1910.00 0.03 0.00 0.00 10.00 0.05 0.00 0.00 10.00 0.06 0.00 0.0011.00 1.98 0.04 0.24 11.00 0.56 0.03 0.10 11.00 0.90 0.03 0.1412 000 150 000 0012 000 030 000 0012 000 0060 000 00............13.00 1.03 0.02 0.09 13.00 0.48 0.02 0.10 13.00 0.95 0.04 0.2114.00 0.04 0.00 0.00 14.00 0.06 0.00 0.00 14.00 0.04 0.00 0.0015.00 0.55 0.01 0.04 15.00 0.52 0.03 0.16 15.00 0.56 0.02 0.1016.00 0.12 0.00 0.00 16.00 0.01 0.00 0.00 16.00 0.03 0.00 0.0017.00 0.44 0.01 0.03 17.00 0.35 0.02 0.09 17.00 0.50 0.02 0.1018.000.010.000.0018.000.050.000.0018.000.020.000.0019.00 0.21 0.00 0.01 19.00 0.29 0.01 0.08 19.00 0.43 0.02 0.0920.00 0.05 0.00 0.00 20.00 0.01 0.00 0.00 20.00 0.10 0.00 0.0121.00 0.33 0.01 0.02 21.00 0.31 0.02 0.11 21.00 0.36 0.01 0.0822.00 0.01 0.00 0.00 22.00 0.02 0.00 0.00 22.00 0.03 0.00 0.0023.00 0.24 0.01 0.02 23.00 0.29 0.01 0.12 23.00 0.12 0.00 0.0124.00 0.18 0.00 0.01 24.00 0.06 0.00 0.01 24.00 0.05 0.00 0.0010K= 6.53K= 7.17K= 8.01Average K factor = 7.24Development & TechnologiesSquare D Monroe Low Voltage Transformer LossesBy PJ HopkinsonSquareDMonroeLowVoltageTransformerLossesByPJHopkinson10/05/2000Objective: Determine losses in Low Voltage Transformer supplying office loadApproach:1. Load profile as measured using Power Logic Sensor at Square D Monroe Office2. Installed transformer (75kVA standard T3H) from 1983, with losses calculated using IEEE C57.1103. Recalculated transformer losses in 75kVA T3H(EE), meeting NEMA TP-1 1996 EfficiencyLoad Summary:1. RMS Average Load Current 31.9 amperes = 15.3% of rated 208.3 amperes rated current2. Average K factor = 7.24 on 208GrdY/120 V Load side of transformer with total harmonic distortion>80%3. Voltage harmonics less than 2% total Harmonic distortion and are ignored.Item 75 kVA T3H 75 kVA T3H (EE)Losses %No-load loss43225317941 4ImprovementNo-loadloss43225317941.4Full Load Load Loss @75C (K=1)a. Primary 1249 1019 230 18.4b. Secondary 782 707 75 9.6c. Total Load Loss20311726 305 15.0Eddy Current losses @75C (K=1)a. Primary31247 22.6b. Secondary653530 46.2Eddy Current losses @75C (K=7.24)P i224 4173 850 6822 6a.rmary....b. Secondary470.6253.4 217.2 46.2Full Load Load Loss @75C (K=7.24)a. Primary1442.41168.8 273.68 19.0b. Secondary1187.6925.4 262.2 22.1Load Loss @ 15.3% Load, K=7.24a. Primary33.827.4 6.4 19.0b. Secondary27.821.7 6.1 22.1c. Total Load Loss61.649.0 12.5 20.4Total Loss (Load + No Load)@15.3% Load, K=7.24493.6302.0191.538.8%Efficiency @ 15.3% Load, K=7.2495.8897.44Average Winding Temperature Rise, degrees C1916Total Loss ( Load + No Load)@15.3% Load, K=1479.5293.4186.138.8%Efficiency@15.3%Load, K=195.9997.51Total Loss (Load + No Load)@35%Load, K=1680.8464.4216.431.8%Efficiency@35%Load, K=197.4798.26754 2509 511Total Loss (Load + No Load)@35%Load, K=7.24754.2509.5244.632.4%Efficiency@35%Load, K=7.2497.2198.10