article: linear induction motor
... termed Arago's rotations, which, by manually turning switches on and off, Walter Baily demonstrated in 1879 as in effect the first primitive induction motor.[1][2][3][4] Practical alternating current induction motors seem to have been independently invented by Galileo Ferraris and Nikola Tesla, a wo ...
... termed Arago's rotations, which, by manually turning switches on and off, Walter Baily demonstrated in 1879 as in effect the first primitive induction motor.[1][2][3][4] Practical alternating current induction motors seem to have been independently invented by Galileo Ferraris and Nikola Tesla, a wo ...
Lectures. Direct current machi
... contact area become same for both the commutator bar then same current flows through both the ...
... contact area become same for both the commutator bar then same current flows through both the ...
The Impact of Mains Impedance on Power Quality
... A Low Impedance Transformer, using the same conventional winding techniques as a generic transformer, but designed with more steel and copper to reduce impedance, has a lower impedance at the fundamental frequency, and a proportionately lower impedance at higher frequencies. Finally, a Premium Trans ...
... A Low Impedance Transformer, using the same conventional winding techniques as a generic transformer, but designed with more steel and copper to reduce impedance, has a lower impedance at the fundamental frequency, and a proportionately lower impedance at higher frequencies. Finally, a Premium Trans ...
MV/LV transformer substations: theory and examples of short
... - delta primary winding (Δ), because, thanks to this connection type, the third harmonics of the magnetizing currents (distorted due to the non-linearity of the magnetic circuit) and any possible homopolar current are free to circulate through the sides of the delta, without flowing into the networ ...
... - delta primary winding (Δ), because, thanks to this connection type, the third harmonics of the magnetizing currents (distorted due to the non-linearity of the magnetic circuit) and any possible homopolar current are free to circulate through the sides of the delta, without flowing into the networ ...
(DVR) Using Sinusoidal Pulse Width Modulation
... The term Power Quality is something that tells about the quality of power. While "power quality" is a convenient term for many, it is the quality of the voltage rather than power or current that is actually described by the term in [1]. Ideally any electric utility is supposed to supply a pure sinus ...
... The term Power Quality is something that tells about the quality of power. While "power quality" is a convenient term for many, it is the quality of the voltage rather than power or current that is actually described by the term in [1]. Ideally any electric utility is supposed to supply a pure sinus ...
Interactive computer aided design of permanent magnet DC motors
... (rare earth magnets are extremely expensive, therefore 1, will usually be small). B. Magnet Materials If the iron sections of the magnetic circuit become saturated, Fig. 5 compares typical demagnetization characteristics of the load-line is no longer linear as depicted in Fig. 4, which the major mag ...
... (rare earth magnets are extremely expensive, therefore 1, will usually be small). B. Magnet Materials If the iron sections of the magnetic circuit become saturated, Fig. 5 compares typical demagnetization characteristics of the load-line is no longer linear as depicted in Fig. 4, which the major mag ...
Impedance Matching
... transformation would be 1.412 =2, and since this is a step-up transformer, we now divide the load impedance by the transformation ratio to get the input impedance that the generator sees: 100/2=50 Ω Note that transformer impedance matching only matches the “real” part of the impedance. If there is a ...
... transformation would be 1.412 =2, and since this is a step-up transformer, we now divide the load impedance by the transformation ratio to get the input impedance that the generator sees: 100/2=50 Ω Note that transformer impedance matching only matches the “real” part of the impedance. If there is a ...
Embedded Magnetorquer Coil Design for Micro
... rotate the satellite is inversely proportional. Fig. 11 shows the torque generated and the corresponding time to rotate the satellite at an angle of 90◦ by energizing different combinations of coils. The value of J for microsatellite is 6.23 kg m2. The torque generated by 4 coils in parallel is 944. ...
... rotate the satellite is inversely proportional. Fig. 11 shows the torque generated and the corresponding time to rotate the satellite at an angle of 90◦ by energizing different combinations of coils. The value of J for microsatellite is 6.23 kg m2. The torque generated by 4 coils in parallel is 944. ...
M. Zhu, D.J. Perreault, V. Caliskan, T.C. Neugebauer, S. Guttowski, and J.G. Kassakian, “Design and Evaluation of Feedforward Active Ripple Filters,” IEEE Transactions on Power Electronics , March 2005, pp. 276-285.
... filter inductor, either directly or through the use of a second sense winding [8], [10]. While the approach is very inexpensive, it is also problematic because the sensor gain depends directly on inductance (which can vary across different units, time, temperature, and flux levels), though this limi ...
... filter inductor, either directly or through the use of a second sense winding [8], [10]. While the approach is very inexpensive, it is also problematic because the sensor gain depends directly on inductance (which can vary across different units, time, temperature, and flux levels), though this limi ...
Document
... applications with up to five three-phase restraint current inputs. Use the three independent restricted earth fault (REF) elements for sensitive ground-fault detection in grounded wye-transformer applications. Detect turn-to-turn winding faults for as little as 2% of the total transformer winding wi ...
... applications with up to five three-phase restraint current inputs. Use the three independent restricted earth fault (REF) elements for sensitive ground-fault detection in grounded wye-transformer applications. Detect turn-to-turn winding faults for as little as 2% of the total transformer winding wi ...
specialtopics_13
... When suppressor operates an arc in gap This arc must quenched as surge pass, or resistor will be destroyed In other cases the gap is not required Arresters vary depending on their voltage class & duty however has: Gaps, coils, valve elements (nonlinear res.) They are stacked in series & he ...
... When suppressor operates an arc in gap This arc must quenched as surge pass, or resistor will be destroyed In other cases the gap is not required Arresters vary depending on their voltage class & duty however has: Gaps, coils, valve elements (nonlinear res.) They are stacked in series & he ...
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... phasors connected by V = IZ, both in magnitude and phase. The diagrams are similar in shape and rotated by the phase angle between voltage and current in each impedance. Remember that the line voltages are the red vectors while the line currents are the blue vectors. Z relates either the line voltag ...
... phasors connected by V = IZ, both in magnitude and phase. The diagrams are similar in shape and rotated by the phase angle between voltage and current in each impedance. Remember that the line voltages are the red vectors while the line currents are the blue vectors. Z relates either the line voltag ...
Isolated Power Panels
... otherwise qualified to operate or service this equipment. This document is intended to provide accurate information only. No responsibility is assumed by BENDER for any consequences arising from use of this document. Turn OFF all sources of electric power before performing any inspections, tests, or ...
... otherwise qualified to operate or service this equipment. This document is intended to provide accurate information only. No responsibility is assumed by BENDER for any consequences arising from use of this document. Turn OFF all sources of electric power before performing any inspections, tests, or ...
Diapositiva 1 - WikiService.at
... Piezo electric sensors are also seen in nature. Bones act as force sensors. Once loaded, bones produce charges proportional to the resulting internal torsion or displacement. Those charges stimulate and drive the build up of new bone material. This leads to the strengthening of structures where th ...
... Piezo electric sensors are also seen in nature. Bones act as force sensors. Once loaded, bones produce charges proportional to the resulting internal torsion or displacement. Those charges stimulate and drive the build up of new bone material. This leads to the strengthening of structures where th ...
DC Machines
... fabricated from cast steel, wrought iron or cast iron. There is no need for laminating it since flux flow is unidirectional. As for the shoe, it keeps field windings in place and distributes flux lines over larger area and thus avoids saturation of flux lines in armature teeth. Pole shoe is essentia ...
... fabricated from cast steel, wrought iron or cast iron. There is no need for laminating it since flux flow is unidirectional. As for the shoe, it keeps field windings in place and distributes flux lines over larger area and thus avoids saturation of flux lines in armature teeth. Pole shoe is essentia ...
Title Reference Design Report for a 150 W Power Factor Corrected
... Figure 2 – RD-292 Photograph, Bottom View. ...
... Figure 2 – RD-292 Photograph, Bottom View. ...
INTERNATIONAL STANDARD IEC 60044-2
... This part of IEC 60044 applies to new inductive voltage transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. Although this standard relates basically to transformers with separate windings, it is also applicable, where appr ...
... This part of IEC 60044 applies to new inductive voltage transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. Although this standard relates basically to transformers with separate windings, it is also applicable, where appr ...
Document
... Figure 1.(d) shows a multiple-transformer topology composed of two cells. It is similar to the cascaded H-bridge topology, but the outputs of the isolation transformers are cascaded instead of directly cascading the H-bridge outputs. As a result, only one dc source is required. Currently, there are ...
... Figure 1.(d) shows a multiple-transformer topology composed of two cells. It is similar to the cascaded H-bridge topology, but the outputs of the isolation transformers are cascaded instead of directly cascading the H-bridge outputs. As a result, only one dc source is required. Currently, there are ...
Lessons Learned From Generator Event Reports
... Phase differential protection is typically applied to generators rated 1,000 kVA and above. For machines above 5,000 kVA, it is always applied [5][6]. It provides selective and fast tripping for phase faults (three phase, phase to phase, and double phase to ground). This protection may also provide ...
... Phase differential protection is typically applied to generators rated 1,000 kVA and above. For machines above 5,000 kVA, it is always applied [5][6]. It provides selective and fast tripping for phase faults (three phase, phase to phase, and double phase to ground). This protection may also provide ...
troubleshooting and maintenance guide
... The testing methods in this guide are written in such a way that it minimizes the disassembly of the charger. Please take the time to familiarize yourself with the wire diagram before getting started. There are some very basic tests to initially perform to determine if service is required on the cha ...
... The testing methods in this guide are written in such a way that it minimizes the disassembly of the charger. Please take the time to familiarize yourself with the wire diagram before getting started. There are some very basic tests to initially perform to determine if service is required on the cha ...
Transformer
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Commonly, transformers are used to increase or decrease the voltages of alternating current in electric power applications.A varying current in the transformer's primary winding creates a varying magnetic flux in the transformer core and a varying magnetic field impinging on the transformer's secondary winding. This varying magnetic field at the secondary winding induces a varying electromotive force (EMF) or voltage in the secondary winding. Making use of Faraday's Law in conjunction with high magnetic permeability core properties, transformers can thus be designed to efficiently change AC voltages from one voltage level to another within power networks.Since the invention of the first constant potential transformer in 1885, transformers have become essential for the transmission, distribution, and utilization of alternating current electrical energy. A wide range of transformer designs are encountered in electronic and electric power applications. Transformers range in size from RF transformers less than a cubic centimeter in volume to units interconnecting the power grid weighing hundreds of tons.