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Power factor correction and harmonic filtering - Hiệu chỉnh hệ số công suất và lọc sóng hài

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Tài liệu tham khảo Power factor correction and harmonic filtering - Hiệu chỉnh hệ số công suất và lọc sóng hài | Chapter L Power factor correction and harmonic filtering Contents 1 Reactive energy and power factor 1.1 The nature of reactive energy L2 L2 1.2 Equipment and appliances requiring reactive energy L2 1.3 The power factor L3 1.4 Practical values of power factor L4 2 Why to improve the power factor L5 2.1 Reduction in the cost of electricity L5 2.2 Technical economic optimization L5 3 How to improve the power factor L7 3.1 Theoretical principles L7 3.2 By using what equipment L7 3.3 The choice between a fixed or automatically-regulated bank of capacitors L9 4 Where to install power factor correction capacitors L10 4.1 Global compensation L10 4.2 Compensation by sector L10 4.3 Individual compensation L11 5 How to decide the optimum level of compensation L12 5.1 General method L12 5.2 Simplified method L12 5.3 Method based on the avoidance of tariff penalties L14 5.4 Method based on reduction of declared maximum apparent power kVA L14 6 Compensation at the terminals of a transformer L15 6.1 Compensation to increase the available active power output L15 6.2 Compensation of reactive energy absorbed by the transformer L16 7 Power factor correction of induction motors L18 7.1 Connection of a capacitor bank and protection settings L18 7.2 How self-excitation of an induction motor can be avoided L19 8 Example of an installation before and after power-factor correction L20 9 The effects of harmonics L21 9.1 Problems arising from power-system harmonics L21 9.2 Possible solutions L21 9.3 Choosing the optimum solution L23 10 Implementation of capacitor banks L24 10.1 Capacitor elements L24 10.2 Choice of protection control devices and connecting cables L25 L1 Schneider Electric - all rights reserved Schneider Electric - Electrical installation guide 2009 L - Power factor correction and harmonic filtering 1 Reactive energy and power factor L2 Schneider Electric - all rights reserved Alternating current systems supply two forms of energy Active energy measured in kilowatt hours kWh