I семестр Тексты для чтения I. ELECTRON THEORY AND
... that passes through it. The coil which is a series of wire loops represents a simple electromagnet. Electromagnets are used as relays, solenoids, motors, and other devices. In making such magnets, the proper field strength should be maintained. The field strength of an electromagnet depends upon som ...
... that passes through it. The coil which is a series of wire loops represents a simple electromagnet. Electromagnets are used as relays, solenoids, motors, and other devices. In making such magnets, the proper field strength should be maintained. The field strength of an electromagnet depends upon som ...
TTR 25 Handheld TTR
... three-phase transformers. It it used to determine the no-load accuracy of CTs and PTs and also determine the need to further test faulty CTs and PTs. The TTR25 applies voltage to the high-voltage winding of a transformer and accurately measures the resulting voltage from the low voltage winding. The ...
... three-phase transformers. It it used to determine the no-load accuracy of CTs and PTs and also determine the need to further test faulty CTs and PTs. The TTR25 applies voltage to the high-voltage winding of a transformer and accurately measures the resulting voltage from the low voltage winding. The ...
Chapter 29 Alternating Currents and Power Transmission
... • For a step-up transformer, Ns > Np, and so Vs > Vp. • For a step-down transformer, Ns < Np, and so Vs < Vp. ...
... • For a step-up transformer, Ns > Np, and so Vs > Vp. • For a step-down transformer, Ns < Np, and so Vs < Vp. ...
Introduction to Fundamental Crystal Oscillators
... value of capacitance is 30 pF but crystals can be manufactured for other values. These circuits are designed for non-critical adjustment and operation with easily available components. In each case, an output of at least 500 millivolts RMS is available across a load of 1000 ohms in parallel with 15 ...
... value of capacitance is 30 pF but crystals can be manufactured for other values. These circuits are designed for non-critical adjustment and operation with easily available components. In each case, an output of at least 500 millivolts RMS is available across a load of 1000 ohms in parallel with 15 ...
COURSE INFORMATION Course Code: ES 201 Course Name
... on loadoperation, phasor diagram and equivalent circuit, losses of a transformer, open and short circuit tests,regulation and efficiency calculation. 3 phase induction motor: Types, Construction, production of rotating field, principle of operation,equivalent circuit and phasor diagram, rating, torq ...
... on loadoperation, phasor diagram and equivalent circuit, losses of a transformer, open and short circuit tests,regulation and efficiency calculation. 3 phase induction motor: Types, Construction, production of rotating field, principle of operation,equivalent circuit and phasor diagram, rating, torq ...
Distribution of electrical energy
... CIRCUTOR has a wide range of specific energy meters for electrical substations, which offer highest performance and accuracy. Moreover, CIRCUTOR provide solutions to measure power quality to fully manage power supply of electricity and any event in the grid. To improve the electrical efficiency and ...
... CIRCUTOR has a wide range of specific energy meters for electrical substations, which offer highest performance and accuracy. Moreover, CIRCUTOR provide solutions to measure power quality to fully manage power supply of electricity and any event in the grid. To improve the electrical efficiency and ...
High Efficiency AC–AC Power Electronic Converter Applied to
... where α is the ratio between the dc-link and the resonant capacitors and β is the ratio between the input choke and the equivalent inductance of the inductor–pot system. The parameters {ω 0 , ω sw , ω n } are the angular resonant frequency, the angular switching frequency, and the normalized angular ...
... where α is the ratio between the dc-link and the resonant capacitors and β is the ratio between the input choke and the equivalent inductance of the inductor–pot system. The parameters {ω 0 , ω sw , ω n } are the angular resonant frequency, the angular switching frequency, and the normalized angular ...
Ch01 - lmn.pub.ro
... the equations of the circuit – Kirchhoff’s equations. It is extremely difficult to obtain such a solution in the case of nonlinear circuits; therefore, only linear dynamic circuits are considered in the following. The standard problem of a linear dynamic circuit is the following: The given data are: ...
... the equations of the circuit – Kirchhoff’s equations. It is extremely difficult to obtain such a solution in the case of nonlinear circuits; therefore, only linear dynamic circuits are considered in the following. The standard problem of a linear dynamic circuit is the following: The given data are: ...
Resonant inductive coupling
Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC circuits. Resonant transformers are widely used in radio circuits as bandpass filters, and in switching power supplies. Resonant inductive coupling is also being used in wireless power systems. Here the two LC circuits are in different devices; a transmitter coil in one device transmits electric power across an intervening space to a resonant receiver coil in another device. This technology is being developed for powering and charging portable devices such as cellphones and tablet computers at a distance, without being tethered to an outlet.Resonant transfer works by making a coil ring with an oscillating current. This generates an oscillating magnetic field. Because the coil is highly resonant, any energy placed in the coil dies away relatively slowly over very many cycles; but if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away. The fields used are predominately non-radiative, near fields (sometimes called evanescent waves), as all hardware is kept well within the 1/4 wavelength distance they radiate little energy from the transmitter to infinity.One of the applications of the resonant transformer is for the CCFL inverter. Another application of the resonant transformer is to couple between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by tuned transformers in the intermediate-frequency amplifiers. The Tesla coil is a resonant transformer circuit used to generate very high voltages, and is able to provide much higher current than high voltage electrostatic machines such as the Van de Graaff generator. Resonant energy transfer is the operating principle behind proposed short range (up to 2 metre) wireless electricity systems such as WiTricity or Rezence and systems that have already been deployed, such as Qi power transfer, passive RFID tags and contactless smart cards.