Ali Hellany

How to design an effective earthing system to ensure the safety of the people

Performing High Voltage (HV) maintenance with a multicraft work force creates a special set of safety circumstances. The safety of people including workers will be discussed in this paper. In Addition, this paper will present an effective approach to design an earthing system. This approach explains the theoretical background necessary to perform the calculation of the required safety voltages. Finally, this paper provides a verification of the proposed approach via simulation with Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis CDEGS software.

AC Interference Study on Pipeline: The Impact of the OHEW under Full Load and Fault Current

Electrical Safety as a result of induced voltage is gaining more attention in the area of HV utilities. This paper discusses the Electrical safety in a pipeline running parallel to a HV transmission line, and the methods of calculating the mutual impedance between the HV and pipeline. In addition, it also introduces a method of calculating the induced voltage in the pipeline and its mitigation process

Network security approach for digital forensics analysis

Advances in Digital Technology have presented new challenges to both Industry and Law. Technology security experts are enhancing platforms security to protect enterprise and government from intrusions, whereas legal experts are adopting new techniques to investigate ldquoillegalrdquo breaches to systems and networks. This paper provides an overview of Digital Forensics methodologies, computer and network vulnerabilities and security measures, forensics tracking mechanisms to detect and deter intruders. A case study for tracing a Distributed DoS attack is also presented.

Design and performance of permanent magnet slotless machines

The paper presents various configurations of PM slotless machines. The design aspects to achieve optimum efficiency are also discussed. The paper also presents various configurations of slotless windings. The details of practical windings are also given. The extra eddy current loss and its reduction are also discussed. The comparative performance of two types of slotless windings is also presented.

Design and Development of Magnetic Torque Couplers and Magnetic Gears

New breed of permanent magnets are increasingly being used in novel permanent magnet electromechanical devices. This paper deals with the application of rare-earth magnets in the design of synchronous magnetic torque couplers and magnet gears. The performance of experimental devices is compared with finite element analysis.

Project based engineering education: a case for teaching EMC/EMI

This paper advocates the need to introduce a course on EMC at undergraduate level. In addition, it discusses and outlines the essential contents of such a course, which can be taken by engineering students with very basic knowledge of electromagnetism. An EMC course is, also, beneficial for non-electrical major students such as mechatronics. The authors also discuss various issues and methodologies used during the introduction of a project based EMC unit at the University of Western Sydney.

Fault current distribution and pole earth potential rise (EPR) under substation fault

Abstract New high-voltage (HV) substations are fed by transmission lines. The position of these lines necessitates earthing design to ensure safety compliance of the system. Conductive structures such as steel or concrete poles are widely used in HV transmission mains. The earth potential rise (EPR) generated by a fault at the substation could result in an unsafe condition. This article discusses EPR based on substation fault. The pole EPR assessment under substation fault is assessed with and without mutual impedance consideration. Split factor determination with and without the mutual impedance of the line is also discussed. Furthermore, a simplified formula to compute the pole grid current under substation fault is included. Also, it includes the introduction of the n factor which determines the number of poles that required earthing assessments under substation fault. A case study is shown.

Design and performance of interior permanent magnet motors with saturating magnetic bridge

Permanent magnet (PM) machines are capable of high efficiency, high power density and extremely wide power operating range. With these characteristics there has been considerable interest in applying them for motion control and robotic applications. Due to their high efficiency, PM machines are ideal general drives in many consumer goods to reduce energy consumption and improve performance. This paper outlines design, fabrication and simulation of interior permanent magnet machines (IPM) with and without saturating magnetic bridge. Based on the study, an IPM is fabricated, tested and performance compared with an equivalent induction motor. The design details of the fabricated IPM machine are also given.

Wireless Ad-hoc networks: Using fuzzy trust approach to improve security between nodes

A wireless Ad-hoc network is a collection of mobile nodes that can be deployed without the need for any centralized management infrastructure. The operation of Ad-hoc networks depends on the cooperation among nodes to provide connectivity and communication routes. However, such an ideal situation may not always be achievable in practice. Some nodes may behave maliciously, resulting in degradation of the performance of the network or even disruption of its operation altogether. To mitigate the effect of such nodes and to achieve higher levels of security and reliability, this paper expands on relevant fuzzy logic concepts to propose an algorithm to establish quantifiable trust levels between the nodes of Ad-hoc networks. These trust levels are then used in the routing decision making process. Using OPNET simulator, the proposed algorithm is validated and further studied. The findings show that when the proposed algorithm is utilised, the overall performance of the Ad-hoc network is significantly improved.

Designing a Lightning Protection System Using the Rolling Sphere Method

Lightning is a natural occurring phenomenon that can cause damage harm and fatality. This paper discusses the lightning protection of a property using the rolling sphere method. In addition, it introduces an easy approach on how to design an effective lightning protection and finally it provides a case study