Transcription of Appendix 9C: Design Calculations for Electrical Design
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Appendix 9C: Design Calculations for Electrical Design
Chapter 9 Electrical Design SPU Design Standards and Guidelines November 2020 i Appendix 9C Design Calculations for Electrical Design Chapter 9 Electrical Design Appendix 9C Design Calculations for Electrical Design ii SPU Design Standards and Guidelines November 2020 Contents 1. Introduction .. 1 2. Software .. 1 3. Calculation Matrix .. 2 4. Basic Requirements for Electrical Calculations .. 4 5. Basic Electrical Engineering Formulas .. 4 List of Symbols .. 4 Direct Current (DC) Formulas .. 5 Alternating Current (AC) Single Phase .. 5 Alternating Current (AC), three -Phase .. 5 Motors .. 6 power Factor Correction .. 7 6. Sample Calculations .. 7 Load .. 7 Generator Sizing .. 7 Sizing Procedures for Generator Single or Multi-sets .. 8 Definitions: Generator Sizing .. 8 Underlying Equations.
Real Power W = V x I x pf Phase Angle θ = arctan(W/VARS) Power Factor pf = W/(V x I) = W/VA Voltage Drop V ( ) d =2× I ×R×cosθ+I ×X ×sinθ where : Vd = voltage drop in circuit sinθ = load reactive factor X = reactance 5.4 ALTERNATING CURRENT (AC), THREE-PHASE V denotes line to line voltage. Basic Formulas Apparent Power kVA =(V I× 3)
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