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The protection of busbar demands high integrity and high speed relaying scheme. This paper presents a new differential relaying scheme for the protection of busbar. The proposed scheme depends on the difference of the value of incoming and outgoing line currents of the respective phase at a particular bus. The proposed scheme has been tested extensively using the PSCAD/EMTDC software package with...
Firstly, the paper shows the comparison between the traditional resistance load and the new electronic load. And then it suggests the implementation scheme of the feedback type DC electronic load, which features feeding back energy to the public grid. Furthermore, the structure of the inverter, which is the kernel module of the feedback type electronic load, is introduced. Finally, an excellent functional...
Class E power amplifier circuit consists mainly of active device operates as a switch, load network and series LC filter tuned to fundamental frequency. Class E power amplifier has different configurqations according to the load network such as: class E power amplifier with shunt capacitance, with parallel tuned circuit and with shunt inductance. The aim of this paper is to compare using simulation...
Resistance spot welding is the key metal joining technique for high volume production in the automotive, biomedical and electronics industry. Weld quality is one of the dominant issues for the welding community. Thus a major focus of the spot welding research has been to control the process to improve the consistency of the welding process. In order to improve the consistency of RSW, control of the...
This paper illustrates a simple interactive method to determine the values of the components of an adaptive Π matching network; the network consists of a series inductor and two shunt capacitors. The network architecture can either be based on tunable or switchable components. Based on a specified range of load variation at a certain frequency, the required minima and maxima of such components are...
The dc-dc converters are used in wide variety of industrial applications. Common traditional dc-dc converters require at least one inductive component which makes them bulky, costly, and with low efficiency. Switched-capacitor (SC) dc-dc converters are a solution that can overcome these problems. However, these converters have high pulse currents when switching transients occur, which will reduce...
An array of resistively and capacitively shunted Josephson junctions with nonsinusoidal current-phase relation is considered for modelling the resistive transition in high-Tc superconductors. The emergence of higher harmonics, besides the sinusoid Ic sin ⊘, is expected for dominant d-wave symmetry of the Cooper pairs, random distribution of potential drops and dirty grains, or in nonstationary conditions...
This paper represents a developed procedure for the evaluation of flashover rates caused by both lightning vertical and non-vertical strokes on transmission lines using a Monte Carlo method. The main goal of this paper is increase the accuracy of the flashover rates through an accurate modelling of network components such as footing impedance, transmission tower and the chain of insulators and also...
To accurately model the deep-rotor-bar phenomena in squirrel-cage induction machines for a wide range of frequencies, the distributed rotor may be generally represented as a high-order transfer function or an equivalent lumped-parameter ladder network. However, when lower-frequency electromechanical transients are of interest, an effective reduced-order model, in which a single-branch rotor resistance...
A technique for implementing monolithic resistors with near-zero temperature coefficient (NZ-TC) over a wide temperature range is presented. The typical structure of monolithic resistors contains a core resistor that is connected to the circuit interconnects through contacts. Typically, the temperature behaviour of contact resistors is ignored, however, we show that one can take advantage of contact...
This paper considers the design of fully-integrated charge pumps whose output voltage is not capped by the main device voltage limitations such as oxide breakdown. The proposed solutions, which do not need dedicated high-voltage fabrication processes, are compared to conventional circuits with same area occupation and are evaluated through simulations.
The traditional low-cost Volts-per-Hertz (V/F) induction motor (IM) drives typically operate based on speed command, whereas the developed torque is consequently determined according to the torque-speed characteristics of the machine. In multi-machine load-sharing applications, it is preferred to have number of identical IMs; whereas in practice, deviations among motor parameters is probable and will...
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