Xem 1-20 trên 128 kết quả Power factor
  • Tài liệu tham khảo Power factor correction and harmonic filtering - Hiệu chỉnh hệ số công suất và lọc sóng hài

    pdf26p nmtinh 30-11-2010 154 70   Download

  • The name of this book is Power Quality, but the title could very well be The Power Quality Do-It-Yourself Book . When I set out to write this book, I wanted it to be user friendly, easy to understand, and easy to apply in solving electrical power system problems that engineers and technicians confront on a daily basis. As an electrical engineer dealing with power system quality concerns, many of the books I consulted lacked direct and precise information and required a very thorough search to find what I needed.

    pdf202p ndkhuong177 14-07-2012 75 32   Download

  • Abstract: Industry standard for the control of switch mode power supply (SMPS) systems has been analog control. Now with the advent of high speed, lower cost digital signal processing (DSP) ICs, digital control there has been an increased interest in digital control of SMPS. The Power Electronics & Power Quality Laboratory of Texas A&M University is currently exploring several implementation aspects of digital control of power factor correction (PFC) stage of SMPS. Two low cost digital controllers: TMS320LF2407 and ST52x420 are evaluated for implementing PFC function.

    pdf11p longmontran 14-01-2010 117 30   Download

  • Lecture Electric circuit theory: AC power analysis include all of the following content: Instantaneous and average power, RMS value, apparent power and power factor, complex power, power factor improvement.

    pdf38p youcanletgo_04 17-01-2016 2 0   Download

  • Digital Control of Switching Power Supply - Power Factor Correction Stage

    pdf11p hoang1 02-11-2009 111 28   Download

  • Power Quality Considerations Harmonics • What Are Harmonics? • Harmonic Sequence • Where Do Harmonics Come From? • Effects of Harmonics on the System Voltage • Notching • Effects of Harmonics on Power System Components • Conductors • Three-Phase Neutral Conductors • Transformers • Effects of Harmonics on System Power Factor • Power Factor Correction Capacitors • IEEE Standard 519 Badrul H. Chowdhury University of Missouri–Rolla Hirofumi Akagi Tokyo Institute of Technology Rajapandian Ayyanar Arizona State University 17.

    pdf63p daohuongthon 22-01-2010 76 22   Download

  • This title explores the issue of innovation engineering, a feature that is essential to the continuation of growth and development in the commercial world. Discussion is divided into three parts: Part I covers the historical basis of innovation, noting that diversity rests upon a duality between concepts in theory and applications put into practice, as well as discussing how innovation has resulted from the interaction of numerous factors, be they societal, human, managerial, organization or technological.

    pdf417p kennybibo 14-07-2012 32 9   Download

  • In this chapter you will learn the following: ² The concepts of power, (real reactive and apparent) and power factor ² The operation of threephase systems and the characteristics of balanced loads in Y and in ¢ ² How to solve problems for threephase systems

    pdf123p longmontran 14-01-2010 44 8   Download

  • Although relatively unknown some years ago, driverless industrial trucks have come to occupy an important position within the framework of highly organized systems of driverless transport (DTS). The essential factors contributing to this fact are without doubt on the one hand the increased need for automation in industry, and on the other hand the high degree of flexibility afforded by these appliances.

    pdf17p congdat261 08-11-2010 59 8   Download

  • If each voltage is connected to a circuit with the same power factor and the three currents return along the same conductor, then the vector sum of the three return currents is zero. Thus instead of three full sized return cables, only one of smaller size is needed. If none of the load is single phase, then the neutral is not needed at all. High voltage supplies are nearly always three phase without a neutral conductor. There is a great economy in distribution costs if the electricity can be supplied in three phases. ...

    pdf0p namde01 11-04-2013 32 8   Download

  • Automatic Voltage Regulator adjusts the excitation so that at the system design power factor, the voltage is correct whatever the current. If however it adjusts the excitation to give the correct voltage at other power factors, then two machines will not run in parallel. One can supply a huge leading current and the other a huge lagging current. A “droop” is needed to give a lower voltage if the power factor lags by more than the system design. This is achieved by the compounding. Faulty Compounding causes unstable sharing of kVAr which can be quite violent....

    pdf221p tuanloc_do 04-12-2012 23 7   Download

  • In No 216 of "The Medical Record" (Dec. 15th, 1874) was published an article written by me, entitled "On some of the Uses of Galvanic and Faradic Baths." The interest manifested in the subject, as evidenced by numerous letters of inquiry since received from physicians in almost all parts of the United States, and some in Europe, has induced me to write the present treatise, in which I have endeavored to present to the profession, as far as lies in my power, all that is necessary to a full comprehension of the electro-balneological treatment.

    pdf55p hotmoingay9 02-02-2013 18 3   Download

  • Tham khảo sách 'electrical installation handbook volume 2', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf137p endlesslovelp 20-09-2012 90 40   Download

  • This guide has been written for electrical Engineers who have to design, select electrical equipment, install these equipment and, inspect or maintain low-voltage electrical installations in compliance with international Standards of the International Electrotechnical Commission (IEC). “Which technical solution will guarantee that all relevant safety rules are met?” This question has been a permanent guideline for the elaboration of this document.

    pdf564p nmtinh 09-06-2015 52 31   Download

  • Changeover contact output indicates that the inverter protective function has activated and the output stopped. Alarm: discontinuity across B-C (continuity across A-C), Normal: continuity across B-C (discontinuity across A-C) Contact capacity 230VAC 0.3A (power factor =0.4) 30VDC 0.3A 1 changeover contact output, contact capacity 230VAC, 0.3A (power factor=0.4) 30VDC 0.3A Switched low when the inverter output frequency is equal to or higher than the starting frequency (initial value 0.5Hz).

    pdf20p liemthanh 15-12-2009 135 30   Download

  • The birth and infancy of entrepreneurship was turned into a specific area of academic study and empirical research quite early. The field greatly evolved, and at the same time, a constant urge to deal with real problems existed, from firm creation to industrial growth, including firm strategy and economic policy. Economic, sociological, and managerial academics began to devise a detailed and interpretative framework for the study of entrepreneurship.

    pdf350p wqwqwqwqwq 18-07-2012 68 30   Download

  • In recent years many countries have made drastic changes to the architecture of financial supervision, and more countries are contemplating modifications. The current restructuring wave is making the supervisory landscape less uniform than in the past. In several countries the architecture still reflects the classic model, with separate agencies for banking, securities and insurance supervision.

    pdf48p truongdoan 10-11-2009 99 24   Download

  • This guide has been written for electrical Engineers who have to design, realize, inspect or maintain electrical installations in compliance with international Standards of the International Electrotechnical Commission (IEC).

    pdf492p ductt47 21-10-2013 63 24   Download

  • Overall structure of electrical power system is in the process of changing. For incremental growth, it is moving away from fossil fuels - major source of energy in the world today - to renewable energy resources that are more environmentally friendly and sustainable [1].

    pdf328p phoebe75 19-02-2013 64 23   Download

  • Internal combustion engines (ICE) are the main sources of powering for almost all road vehicles, yet many other machines too. Being under strength development for a number of years, they have already reached a relatively high level of technical excellence and now they also produce acceptable output parameters. Still, they are not devoid of drawbacks. Harmful exhaust emissions can be pointed as the most important here. This problem is the main focus of interest for automotive researchers and engineers.

    pdf243p namde01 11-04-2013 64 20   Download

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