Xem 1-20 trên 350 kết quả Voltage
  • causing a voltage sag with duration of more than 1 cycle occurs within the area of vulnerability. However, faults outside this area will not cause the voltage to drop below 0.5 pu. The same discussion applies to the area of vulnerability for ASD loads. The less sensitive the equipment, the smaller the area of vulnerability will be (and the fewer times sags will cause the equipment to misoperate). The voltage sag performance for a given customer facility will depend on whether the customer is supplied from the transmission system or from the distribution system.

    pdf473p beobobeo 01-08-2012 52 13   Download

  • Calculation of the induced voltage Ui induced voltage in a cable system depends on the mutual inductance between the core and sheath, wires and eventually current cable length: LM is mutual inductivity core and shell (H / km). Inductivity interplay between core and shell LM calculated as follows: To install the formation of trefoil

    pdf27p beobobeo 01-08-2012 74 5   Download

  • Bài giảng Chương 7: Reference Voltage & Comparator được thực hiện nhằm giúp các bạn nắm bắt được những kiến thức về module VREF; module COMPARATOR. Mời các bạn tham khảo bài giảng để nắm bắt nội dung chi tiết. Tài liệu hữu ích với các bạn chuyên ngành Công nghệ thông tin.


    pdf16p hakilukos 11-05-2015 20 4   Download

  • Merlin Gerin technical guide Medium Voltage help you to carry out the calculations requires to define and determine equipment dimensions and provides useful information enabling you to design your MV switchboard. It's goal is presenting and assisting in the section of MV equipment in conformity with standards; proving design rules used to calculate the dimensions or ratings of an MV switchboard.



    pdf80p ducxt1995 15-05-2015 28 3   Download

  • Universal voltage mode biquadratic filter synthesis using nodal admittance matrix expansion. This paper presents a systematic synthesis procedure for generating universal voltage- mode biquadratic filters based on the nodal admittance matrix expansion. The obtained eight equivalent circuits can realize all five standard filter functions namely lowpass, bandpass, highpass, notch and allpass employing only two active elements.

    pdf23p lehasiphuong 22-05-2018 4 1   Download

  • This paper proposes the Finite control set Model Predictive Control (FCS-MPC) with delay compensation for three-phase threelevel T-Type NPC inverter (T-Type NPC) of grid-connected photovoltaic systems (PV). The proposed FCS-MPC controls the objectives: current tracking control, DC-link capacitor voltage balance, the reduction of switching frequency to ensure issues of the power quality and improve the efficiency of grid-connected of PV system.

    pdf13p sansan2 26-05-2018 6 1   Download

  • Current injecting a grounding system of high voltage substation decides the amplitude and the voltage distribution along the grounding grid [1]-[2]. Therefore, the determination of short circuit current at substation is always cared by the designers. This paper presents a method to fast calculate the current passing through grounding system of high voltage substation when lightning strikes at the grounding wire of transmission line.

    pdf8p loki1234 24-05-2018 2 0   Download

  • This paper presents the application of anAutomatic Phase Balancing Device (APBD) to reduce current unbalance in low voltage distribution networks. The proposed algorithm allowsus to calculate the unbalanced level and to conduct the automatic phase balancing device during load variations. This device was then applied to a low voltage feeder of Cau Giay district (Viet Nam). Results show that the unbalanced current is always maintained lessthan 15 %.

    pdf12p cumeo2009 31-07-2018 3 0   Download

  • This paper investigates a Distributed Generators (DG) connected to distribution networks offering multiple benefits for grids and environments in the case of renewable sources used. Nevertheless, this task requires an appropriate planning and control strategy, if not several drawbacks can issue, including voltage rise problems and increased power losses. To overcome such disadvantages, this paper proposes a coordinated voltage control CVC method for distribution networks with multiple distributed generators.

    pdf14p thuyliebe 05-10-2018 3 0   Download

  • This paper presents our recent developments as well as emerging techniques introduced in literature for decreasing the operation voltage of electrostatic comb drive micro-mirror. Methods for decreasing the operation voltage at large rotation angle and high scan frequency for application in the laser scanning display are focused to discuss in this paper.

    pdf9p thienthanquydu 19-10-2018 1 0   Download

  • Titanium oxide nanoparticles (TiO2) were combined with polymethylthiophene (PMT), giving nanocomposites in core-shell structure via chemical polymerization. In this work, the current - voltage characteristics of sandwich cells composed from such nanocomposite have been studied. For these investigations films of nanocomposites were prepared by electrophoretic deposition (EPD).

    pdf6p chikychiky 11-11-2018 1 0   Download

  • Điện áp lệch không đầu vào: Điện áp lệch không (input offset voltage): do sự không cân bằng của các mạch điện tử trong op amp, khi điện áp đầu vào bằng không thì điện áp đầu ra khác không. Điện áp offset là điện áp cần đặt vào đầu vào để cho đầu ra bằng 0. Ký hiệu VIO.

    pdf21p se7en_1007 13-10-2010 453 117   Download

  • Electronics may be defined as the science and technology of electronic devices and systems.Electronic devices are primarily non-linear devices such as diodes and transistors and in general integrated circuits (ICs) in which small signals (voltages and currents) are applied to them. Of course, electronic systems may include resistors, capacitors and inductors as well.

    ppt58p taphikhanh 18-12-2009 190 97   Download

  • Products and systems that provide protection, control and measurement for electrical installations, enclosures, switchboards, electronics and electromechanical devices for industrial machines, plants and related service. The offering also includes intelligent building control systems, also known as KNX systems, for home and building automation to improve comfort, energy efficiency and security.

    pdf54p nmtinh 03-11-2010 364 85   Download

  • Ecodial V3.38 Low-voltage electrical installation design software Fupact and variable speed drive integrated Building a New Electric World Ecodial V3.38 complies with the latest electrical standards, bringing LV installation design software to a new level of performance. With Ecodial V3.38, design low the easy way Personalise your project New standards Ecodial V3.3 series have been approved by the UTE. It can be used to produce design files complying with: b the CENELEC R 064-003 European calculation guide b IEC 364 installation standards.

    pdf4p bimatcuocdoi0905 22-04-2010 214 69   Download

  • A neural-network-based space-vector PWM controller for a three-level voltage-fed inverter induction motor drive

    pdf10p hoang1 31-10-2009 134 50   Download

  • The discrete time control of a three phase 4 wire PWM inverter with variable DC link voltage for simultaneously supply of three phase and single phase load in transformerless stand alone photovoltaic application with battery energy storage (BES) and LC output filter is described.

    pdf9p hoang1 02-11-2009 170 39   Download

  • Inverter Technology variable power supply voltage and frequency adjustment can not be fixed, the power supply voltage and frequency are required to use energy. Advantages of this technology is microwave lighter, smaller but wider oven cavity, energy and cooking time, especially as a result of better food.

    ppt50p taphikhanh 18-12-2009 93 30   Download

  • Power electronic converters (PECs) are static devices, without any movable parts, that convert electric energy of one set of properties into electric energy of another, different set of properties. The properties that are changed by the action of the converter are one or more of the following: number of phases, frequency, and voltage rms (or average, in the DC case) value. Thus any power electronic converter is essentially a transformer in a broad sense. Action of a power electronic converter is illustrated in Fig....

    pdf56p liemthanh 15-12-2009 92 23   Download

  • With technology advancements in semiconductor devices such as insulated gate bipolar transistors (IGBTs) and gate commutated thyristors (GCTs), modern highpower medium voltage (MV) drives are increasingly used in petrochemical, mining, steel and metals, transportation and other industries to conserve electric energy, increase productivity and improve product quality. Although research and development of the medium voltage (2.3 KV to 13.8 KV) drive in the 1-MW to 100-MW range are continuously growing, books dedicated to this technology seem unavailable.

    pdf333p ctq_109 28-02-2013 69 22   Download


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