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4 Surge Mitigation Functions
4 Surge Mitigation Functions

... predetermined threshold value to values either close to that of the threshold or much lower than the threshold. Surge mitigation controlled by an integrated circuit (IC) and a power element can be multimode. For example in a DC supply feed using such an arrangement the IC can maintain the conditione ...
chapter 3 - Portal UniMAP
chapter 3 - Portal UniMAP

...  There is a group of coils for each pole in the machine. Within each group, coils are distributed over several slots in the stator. An example is shown in Figure 3.4.  A voltage is induced in each coil with the movement of the rotating air-gap flux. The coil voltages are displaced from one another ...
Auxiliary coil and exciter equipped with permanent magnets
Auxiliary coil and exciter equipped with permanent magnets

Downsized High-Heat-Dissipation Choke Coil Designed
Downsized High-Heat-Dissipation Choke Coil Designed

... leakage of magnetic flux, resulting in a considerable increase in AC copper loss in windings. This is a limiting factor of designing a choke coil with ferrite cores in region III. In contrast, powder cores have a relatively small gap of below 2.5 mm, which ensures that they are usable for choke coi ...
stator core faults detection with low flux density method
stator core faults detection with low flux density method

... heating is performed by means of the infrared measurement devices. The method has a number of disadvantages among which the fact that it requires a high power supply source for supplying the excitation winding made up of several windings of a cable adequately dimensioned so that to correspond to the ...
Process Variation Aware Dynamic Power Management in Multicore Systems with
Process Variation Aware Dynamic Power Management in Multicore Systems with

CHRISTU JYOTI INSTITUTE OF TECHNOLOGY & SCIENCE LABORATORY MANUAL 2013-14 1
CHRISTU JYOTI INSTITUTE OF TECHNOLOGY & SCIENCE LABORATORY MANUAL 2013-14 1

KE2517881796
KE2517881796

Taser International, Inc. v. Stinger Systmes, Inc., Case No. CV 07
Taser International, Inc. v. Stinger Systmes, Inc., Case No. CV 07

Full-text
Full-text

... those converters has its pros and cons [13]. The idea of this paper is to combine advantages of qZSI based DC/DC converter and resonant converter. Series resonant converter topology is the simplest and widely used [9, 10, 14] and will be selected for more detailed study. Fig. 1 presents the proposed ...
Distribution Systems
Distribution Systems

... expansion can only be met by laying new lines. However, on an overhead system, poles, wires, transformers etc., can be easily shifted to meet the changes in load conditions. (iv) Faults. The chances of faults in underground system are very rare as the cables are laid underground and are generally pr ...
3.1. The dc transformer model
3.1. The dc transformer model

... 1. The dc transformer model represents the primary functions of any dc-dc converter: transformation of dc voltage and current levels, ideally with 100% efficiency, and control of the conversion ratio M via the duty cycle D. This model can be easily manipulated and solved using familiar techniques of ...
INDUCTION MOTOR (squirrel cage)
INDUCTION MOTOR (squirrel cage)

INDUCTION MOTOR (squirrel cage)
INDUCTION MOTOR (squirrel cage)

... The harmonics in the mmf can be further reduced by increasing the number of slots: e.g. winding of a phase are placed in 12 slots: ...
- Pcpolytechnic
- Pcpolytechnic

... which is slightly less than the synchronous speed. As shown in fig.(1), the rotor consists of copper or aluminium bars which are permanently short circuited at both the ends using the conducting rings called end rings. ...
New York State Electric Meter Engineers` Committee Guide for
New York State Electric Meter Engineers` Committee Guide for

... Secondary circuits should be routed so as to avoid the possibility of induced voltages and the effects of ground faults. Where this is not practical, the secondary circuit should be designed to minimize these effects. In those circuits involving solid state metering, suitable protection against the ...
Engineering Letters
Engineering Letters

... An electric car is an alternative-design automobile that uses an electric motor to power the car, with the electricity being provided by a battery. . In an electric vehicle the traditional gasoline or diesel engine and fuel tank is replaced with an electric motor, a battery pack and controller. The ...
Photoflash Capacitor Charger with Programmable Current Limit and
Photoflash Capacitor Charger with Programmable Current Limit and

Symmetrical Components 1 - WSU Conference Management
Symmetrical Components 1 - WSU Conference Management

Active Harmonic Filtering Solutions Catalogue
Active Harmonic Filtering Solutions Catalogue

... Harmonic currents are caused by non-linear loads connected to the distribution system. A load is said to be non-linear when the current it draws does not have the same waveform as the supply voltage. The flow of harmonic currents through system impedances in turn creates voltage harmonics, which dis ...
Volume/Weight/Cost Comparison of a 1 MVA 10kV/400V
Volume/Weight/Cost Comparison of a 1 MVA 10kV/400V

... Fig. 1(a) shows the basic schematic of a three-phase LFT in delta-wye connection. The electrical part consists of two times three copper (or aluminum) windings and a magnetic core, which is usually made of low-loss silicon steel laminations. While dry-type solutions are available, distribution trans ...
Common Questions on Partial DisCharge
Common Questions on Partial DisCharge

... indicating that small voids are present somewhere between the high-voltage conductor and ground. Most electrical equipment is designed to have no PD during normal operation because the purely organic insulation systems used in power cables, switchgear, and transformers deteriorate rapidly when attac ...
DB32637643
DB32637643

... the compensation not only of current harmonics produced by fluctuating loads, but also of reactive power and unbalance of non-linear and distorting loads[4],[5]. At low voltage levels, conventional two level inverters are used. At medium voltage levels, the conventional two level inverters either re ...
Transient Recovery Voltages During the Switching Under Out
Transient Recovery Voltages During the Switching Under Out

... TD10; they are meant to represent the high natural frequencies and the low damping of transformers. These high rate of rise values and even higher amplitude factors would also prevail in case of out-of-phase switching, since the voltage drop mainly appears across the generator and the step-up transf ...
Digital Simulation of the Generalized Unified Power Flow Controller
Digital Simulation of the Generalized Unified Power Flow Controller

... other one controls the reactive power flows in the lines by injecting series active voltage. The circuit model for the IPFC is developed and simulated by using MATLAB simulink and PSPICE [8]. Furthermore the investigation of the dynamic operation of control scheme for both STATCOM and SSSC based on ...
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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.
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