Page 1 ‹#› EENG 224 Chapter 11 AC Power Analysis Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University Chapter Objectives: ? Know the difference between instantaneous power and average power ? Learn the AC version of maximum power transfer theorem ? Learn about the concepts of effective or Rms value ? Learn about the complex power, apparent power and power factor ? Understand the principle of conservation of AC power ? Learn about power factor correction Page 2 ‹#› EENG 224 Chapter 11 AC Power Analysis Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University Chapter Objectives: ? Know the difference between instantaneous power and average power ? Learn the AC version of maximum power transfer theorem ? Learn about the concepts of effective or Rms value ? Learn about the complex power, apparent power and power factor ? Understand the principle of conservation of AC power ? Learn about power factor correction ‹#› EENG 224 An Electical Power Distribution Center Page 3 ‹#› EENG 224 Chapter 11 AC Power Analysis Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University Chapter Objectives: ? Know the difference between instantaneous power and average power ? Learn the AC version of maximum power transfer theorem ? Learn about the concepts of effective or Rms value ? Learn about the complex power, apparent power and power factor ? Understand the principle of conservation of AC power ? Learn about power factor correction ‹#› EENG 224 An Electical Power Distribution Center ‹#› EENG 224 Apparent Power and Power Factor 1 2 cos( ) cos( ) m m v i Rms Rms v i P V I V I ?? ?? = -= - 1 2 m m Rms Rms S V I V I = = Apparent Power cos Power Factor () v i P pf Sp S Pf ?? = ×= - × = = ? The Apparent Power is the product of the Rms value of voltage and current. It is measured in V olt amperes (VA). ? The Power Factor (pf) is the cosine of the phase difference between voltage and current. It is also the cosine of the angle of load impedance. The power factor may also be regarded as the ratio of the real power dissipated to the apparent power of the load. ? The Average Power depends on the Rms value of voltage and current and the phase angle between them. Page 4 ‹#› EENG 224 Chapter 11 AC Power Analysis Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University Chapter Objectives: ? Know the difference between instantaneous power and average power ? Learn the AC version of maximum power transfer theorem ? Learn about the concepts of effective or Rms value ? Learn about the complex power, apparent power and power factor ? Understand the principle of conservation of AC power ? Learn about power factor correction ‹#› EENG 224 An Electical Power Distribution Center ‹#› EENG 224 Apparent Power and Power Factor 1 2 cos( ) cos( ) m m v i Rms Rms v i P V I V I ?? ?? = -= - 1 2 m m Rms Rms S V I V I = = Apparent Power cos Power Factor () v i P pf Sp S Pf ?? = ×= - × = = ? The Apparent Power is the product of the Rms value of voltage and current. It is measured in V olt amperes (VA). ? The Power Factor (pf) is the cosine of the phase difference between voltage and current. It is also the cosine of the angle of load impedance. The power factor may also be regarded as the ratio of the real power dissipated to the apparent power of the load. ? The Average Power depends on the Rms value of voltage and current and the phase angle between them. ‹#› EENG 224 Apparent Power and Power Factor ? Not all the apparent power is consumed if the circuit is partly reactive. Purely resistive load (R) ? v – ? i = 0, Pf = 1 P/S = 1, all power are consumed Purely reactive load (L or C) ? v – ? i = ±90 o , pf = 0 P = 0, no real power consumption Resistive and reactive load (R and L/C) ? v – ? i > 0 ? v – ? i < 0 • Lagging - inductive load • Leading - capacitive load P/S < 1, Part of the apparent power is consumed Page 5 ‹#› EENG 224 Chapter 11 AC Power Analysis Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University Chapter Objectives: ? Know the difference between instantaneous power and average power ? Learn the AC version of maximum power transfer theorem ? Learn about the concepts of effective or Rms value ? Learn about the complex power, apparent power and power factor ? Understand the principle of conservation of AC power ? Learn about power factor correction ‹#› EENG 224 An Electical Power Distribution Center ‹#› EENG 224 Apparent Power and Power Factor 1 2 cos( ) cos( ) m m v i Rms Rms v i P V I V I ?? ?? = -= - 1 2 m m Rms Rms S V I V I = = Apparent Power cos Power Factor () v i P pf Sp S Pf ?? = ×= - × = = ? The Apparent Power is the product of the Rms value of voltage and current. It is measured in V olt amperes (VA). ? The Power Factor (pf) is the cosine of the phase difference between voltage and current. It is also the cosine of the angle of load impedance. The power factor may also be regarded as the ratio of the real power dissipated to the apparent power of the load. ? The Average Power depends on the Rms value of voltage and current and the phase angle between them. ‹#› EENG 224 Apparent Power and Power Factor ? Not all the apparent power is consumed if the circuit is partly reactive. Purely resistive load (R) ? v – ? i = 0, Pf = 1 P/S = 1, all power are consumed Purely reactive load (L or C) ? v – ? i = ±90 o , pf = 0 P = 0, no real power consumption Resistive and reactive load (R and L/C) ? v – ? i > 0 ? v – ? i < 0 • Lagging - inductive load • Leading - capacitive load P/S < 1, Part of the apparent power is consumed ‹#› EENG 224Read More

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