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ASME PTC 19.6-2018 Electrical Power Measurements, 2018
- CONTENTS
- NOTICE
- FOREWORD
- ASME PTC COMMITTEE ROSTER
- CORRESPONDENCE WITH THE PTC COMMITTEE
- INTRODUCTION
- Section 1 Object and Scope [Go to Page]
- 1-1 OBJECT
- 1-2 SCOPE
- 1-3 TEST UNCERTAINTY
- 1-4 OTHER REQUIREMENTS AND REFERENCES [Go to Page]
- 1-4.1 Other Requirements
- 1-4.2 References
- Section 2 Definitions and Descriptions of Terms [Go to Page]
- 2-1 GENERAL
- 2-2 DEFINITIONS [Go to Page]
- 2-2.1 Symbols and Subscripts
- Section 3 Power System Measurement Techniques [Go to Page]
- 3-1 INTRODUCTION
- 3-2 SINGLE-PHASE, TWO-WIRE POWER SYSTEMS
- 3-3 THREE-PHASE, THREE-WIRE POWER SYSTEMS
- 3-4 THREE-PHASE, FOUR-WIRE POWER SYSTEMS
- 3-5 CALCULATION OF PRIMARY ACTIVE AND REACTIVE POWER [Go to Page]
- 3-5.1 Primary Watts
- 3-5.2 Primary Vars
- 3-6 POWER FACTOR [Go to Page]
- 3-6.1 Three-Phase, Three-Wire Power System
- 3-6.2 Three-Phase, Four-Wire Power Systems
- 3-7 EXCITER POWER [Go to Page]
- 3-7.1 Derivation From Breaker Currents
- 3-7.2 Derivation From Field Voltage and Current
- 3-7.3 Detailed Analysis of Exciter Load
- 3-8 AUXILIARY POWER
- 3-9 ELECTRIC MOTOR POWER MEASUREMENT [Go to Page]
- 3-9.1 Power Meter Method
- 3-9.2 Calculated Method
- Section 4 Power Meters [Go to Page]
- 4-1 TYPES OF METERS
- 4-2 CATEGORIES OF INSTRUMENTATION [Go to Page]
- 4-2.1 Test Instruments
- 4-2.2 Station Instruments
- 4-2.3 Performance Monitoring Instruments
- 4-2.4 Clamp-on Instruments
- 4-2.5 Uncalibrated Instruments
- 4-3 WATTMETERS
- 4-4 WATT-HOUR METERS
- 4-5 VARMETERS
- 4-6 VAR-HOUR METERS
- 4-7 POWER FACTOR METERS
- 4-8 CALIBRATION [Go to Page]
- 4-8.1 Wattmeter and Watt-Hour Meter Calibration
- 4-8.2 Varmeter and Var‐Hour Meter Calibration
- Section 5 Instrument Transformers [Go to Page]
- 5-1 PURPOSE
- 5-2 VOLTAGE TRANSFORMERS
- 5-3 CURRENT TRANSFORMERS
- 5-4 INSTRUMENT TRANSFORMER CONNECTIONS
- 5-5 CALIBRATION REQUIREMENTS [Go to Page]
- 5-5.1 VT Calibration
- 5-5.2 CT Calibration
- 5-5.3 Ratio Error Modeling of Instrument Transformers
- 5-6 CORRECTION OF VT ERRORS [Go to Page]
- 5-6.1 VT Burden Measurements
- 5-6.2 Analytical Calculation of VT Ratio and Phase-Angle Correction Factors
- 5-7 VOLTAGE DROP CORRECTIONS FOR VT SECONDARY CIRCUITS
- 5-8 CORRECTION OF IRON-CORE CT ERRORS [Go to Page]
- 5-8.1 Calculation of CT Phase-Angle Correction Factors
- 5-8.2 Demagnetization
- 5-9 CALCULATION OF PHASE-ANGLE CORRECTION FACTORS
- 5-10 PRECAUTIONS IN THE USE OF INSTRUMENT TRANSFORMERS
- 5-11 UTILIZATION OF STATION INSTRUMENT TRANSFORMERS
- Section 6 Net Power Output [Go to Page]
- 6-1 INTRODUCTION
- 6-2 DIRECT MEASUREMENT OF NET POWER
- 6-3 CALCULATION OF NET POWER [Go to Page]
- 6-3.1 Power Transformer Losses
- 6-3.2 Line Losses
- 6-4 NET PLANT POWER FACTOR
- 6-5 POWER RELATIONSHIPS BETWEEN PRIMARY AND SECONDARY WINDINGS OF MAIN POWER TRANSFORMER
- Section 7 Test Uncertainty [Go to Page]
- 7-1 UNCERTAINTY CALCULATION REQUIREMENTS [Go to Page]
- 7-1.1 Uncertainty of the Result, UR
- 7-1.2 Sensitivity, Θ
- 7-1.3 Systematic Standard Uncertainty
- 7-1.4 Random Standard Uncertainty
- 7-1.5 Other Considerations
- 7-2 POWER UNCERTAINTY CALCULATION [Go to Page]
- 7-2.1 Systematic Uncertainty and Correlation
- 7-2.2 Random Standard Uncertainty
- 7-2.3 Gross Power Uncertainty
- 7-2.4 Corrected Gross Power Uncertainty
- 7-3 UNCERTAINTY CONSIDERATIONS
- Figures [Go to Page]
- Figure 3-2-1 Single-Phase, Two-Wire Power Measurement
- Figure 3-3-1 Three-Phase, Three-Wire Generators
- Figure 3-4-1 Three-Phase, Four-Wire Wye Generator
- Figure A-1-1 Example Electrical Single-Line Schematic
- Figure A-3.4-1 Sample CT Ratio Correction Factor Curve
- Figure A-3.4-2 Sample CT Phase-Angle Error Curve
- Figure B-2-1 Sample Generator Electrical Loss Curve
- Figure B-4-1 Density of Hydrogen/Air Mixture
- Figure C-2-1 Farber Plot
- Figure D-3-1 Typical Current Transformer Characteristics
- Tables [Go to Page]
- Table 1-3-1 Class Requirements for Active Power Measurement Uncertainty
- Table 2-2.1-1 Symbols
- Table 2-2.1-2 Subscripts
- Table 7-2.3-1 Typical Gross Power Uncertainties for Test Classes
- Table 7-2.4-1 Gross Power Correction Uncertainties
- Table A-2-1 Sample Wattmeter Data
- Table A-3.1-1 Example VT Burden Measurement Data
- Table A-3.1-2 Example VT Calibration Data
- Table A-3.2-1 VT and CT Ratio and Phase-Angle Correction Factor Results
- Table A-3.7-1 Sample VT Wiring Voltage Drop Corrections
- Table A-6-1 Conversion of Secondary Side Readings to Primary Side Values
- Table B-1-1 Sample Generator Data
- Table D-2-1 Uncertainties Associated With Quality of Burden Value
- Table D-2-2 VT Uncertainty Summary in RCF Units
- Table D-3-1 CT Uncertainty Summary in RCF Units
- NONMANDATORY APPENDIX A SAMPLE CALCULATION OF CLASS A GROSS GENERATOR OUTPUT DERIVED FROM THREE-PHASE SECONDARY MEASUREMENTS [Go to Page]
- A-1 INTRODUCTION
- A-2 GENERATOR OUTPUT METERING REQUIREMENTS
- A-3 CORRECTIONS FOR INSTRUMENT TRANSFORMER BURDENS AND WIRING LOSSES [Go to Page]
- A-3.1 VT Burden Measurements
- A-3.2 VT Ratio Correction Factors
- A-3.3 VT Phase-Angle Error
- A-3.4 CT Ratio Correction Factors
- A-3.5 CT Phase-Angle Error
- A-3.6 Phase-Angle Correction Factors
- A-3.7 VT Voltage Drop Corrections
- A-4 CONVERSION OF SECONDARY SIDE READINGS TO PRIMARY SIDE VALUES
- A-5 POWER FACTOR CALCULATION
- A-6 PHASE ANGLE
- NONMANDATORY APPENDIX B SAMPLE CORRECTION OF GROSS GENERATOR OUTPUT TO RATED CONDITIONS [Go to Page]
- B-1 INTRODUCTION
- B-2 POWER FACTOR CORRECTION
- B-3 GENERATOR HYDROGEN PRESSURE CORRECTION
- B-4 GENERATOR HYDROGEN PURITY CORRECTION
- B-5 CORRECTED GROSS GENERATOR OUTPUT
- NONMANDATORY APPENDIX C DETERMINING VT RATIO CORRECTION FACTOR AND PHASE-ANGLE ERROR USING THE FARBER METHOD [Go to Page]
- C-1 INTRODUCTION
- C-2 DATA AND ANALYSIS METHODOLOGY
- NONMANDATORY APPENDIX D ESTIMATING UNCERTAINTIES OF INSTRUMENT TRANSFORMERS [Go to Page]
- D-1 INTRODUCTION
- D-2 VOLTAGE TRANSFORMERS
- D-3 CURRENT TRANSFORMERS
- D-4 SUMMARY [Go to Page]
