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Overvoltage protection concept for DC railway systems



ABSTRACT

Overvoltages in electrical networks result from the effects of lightning strokes and switching actions and cannot be avoided. Furthermore, the power supply of electrical railways is endangered by direct or nearby lightning. A new device, combining protection against overvoltages and touch voltages and protection of people is introduced. Protection concepts for DC railway systems are introduced, cons ....etc

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An ideal artificial hand should match the requirements of prosthetics and humanoid robotics.

It can be wearable by the user which means that it can be perceived as part of the natural body and should replicate sensory-motor capabilities of the natural hand. However ,such an ideal bionic prosthesis is still far from reality.

This paper describes the design and fabrication of a novel artificial hand based on a biomechatronic and cybernetic approach. The approach is aimed at providing natural sensory-motor co-ordination, biomimetic mechanis ....etc

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ADVANCED COMPUTER ANALYSIS OF
POWER SYSTEM CONTROL AND POWER ELECTRONICS TRANSIENTS
EMTDC/PSCAD (INTRODUCTION)
EMTDC (ElectroMagnetic Transients for HVDC).
• Developed in 1975 by Manitoba Hydro to study the
Nelson River HVDC power system
• Used extensively for many types of power simulation studies,
• Used in both Unix and PC systems
• A more user friendly version of EMTP program
PSCAD (Power Systems Computer Aided Design)
• A graphical User Interface to EMTDC
• PSCAD V1 in 1988 on Apollo wo ....etc

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This article describes the Voltage swell and overvoltage compensation problems in a diode-bridge rectifier supported transformerless-coupled
dynamic voltage restorer (DVR). applying conventional in-phase or phase-invariant boosting method in case of condition of swell or overvoltage, may cause a a rapid rise in dc-link voltage which may ultimately lead to the damage of the storage capacitors and switching devices, and increase the switching loss. The minimum energy injection scheme is unable to solve these problems. Here, a novel unidirectio ....etc

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