by Olusegun Ogundapo, Charles Nche, Alistair Duffy and Gang Zhang
Original Research
The use of Ethernet cables in internet of things (IoT) infrastructure continues to grow due to high demand as the reach of the IoT itself expands. Crosstalk is a major limiting factor in communications systems that need to be taken into consideration when selecting cables for deployment. In typical installations, these cables require a certain degree of manipulation that involves repeated coiling and uncoiling of a few meters which can adversely affect performance. It is thought that this is especially true with counterfeit or copper clad aluminum (CCA) cables often disguised as compliant Ethernet cables. In this paper, four unshielded twisted pair cables of which one of them is a CCA cable were subjected to three rounds of coiling and uncoiling tests representing installation manual handling. Given the visually complex measurements that are a feature of the Ethernet infrastructure, an approach to quantifying chances is needed that is particularly sensitive and nondiscriminatory. The Feature Selective Validation (FSV) method and Kolmogorov-Smirnov test is proposed as an appropriate method to use to assess crosstalk variations between the cables when subjected to this manipulation. The paper shows that the methods do allow quantified measurement of the variations between the tests which can lead to objective decision on the part of the cable installer.
American Journal of Electrical and Electronic Engineering. 2018, 6(1), 32-37. DOI: 10.12691/ajeee-6-1-5
Pub. Date: April 11, 2018
13672 Views2268 Downloads
by khalaf Y. Alzyoud
Original Research
This work focus on observation of the insulating system and analysis of the insulation resistance measurement results in 110kV, 20 and 63 MVA oil-immersed power transformers are presented. The observation was undertaken from the start-up and it includes graphical and numerical values obtained by measurements, the analysis of the state of insulation provides possibilities to undertake remedial action in due time with the aim to extend the transformer life.
American Journal of Electrical and Electronic Engineering. 2018, 6(1), 28-31. DOI: 10.12691/ajeee-6-1-4
Pub. Date: March 23, 2018
10102 Views1950 Downloads
by Nour ali Rostami and Mahmoud Oukati Sadegh
Original Research
Effective utilization of power distribution networks requires extensive studies in such areas as using of capacitors, voltage regulators, network reconfiguration, and so on. Indeed, achieving to accurate answers, and managing appropriate solutions for network problems requires a detailed modeling of the network in the process of the above studies. Among the elements that are important for modeling in network research is network loads. Loads are generally being modeled such as constant power. While load nature is often widespread and different. Failure to have a detailed modeling can lead to non-optimal and even wrong answers, and will result in waste of costs and investments. Since the load flow is the basis of any research in distribution networks, in this paper the effect of load modeling on load flow results which can clarify the importance of the load modeling for other network studies are investigated. What can be inferred from this study is that any study in distribution networks can only lead to optimal results if the load model is accurate. Therefore, attempting to measure necessary load parameters and using their exact modeling methods in distribution networks should be done in order to obtain more accurate results and more savings.
American Journal of Electrical and Electronic Engineering. 2018, 6(1), 16-27. DOI: 10.12691/ajeee-6-1-3
Pub. Date: February 03, 2018
17586 Views2170 Downloads
by Majeed Nader and John Liu
Original Research
This paper presents the hardware design and implementation of the in-vehicle system (IVS) for the European Union (EU) emergency call (eCall) system. Modules of the IVS are developed and implemented on a field programmable gate array (FPGA) device. The modules are simulated, synthesized, and optimized to be loaded on a reconfigurable device as a system-on-chip (SoC) for the IVS electronic device. Benchtop test is completed for testing and verification of the developed modules. The hardware architecture and interfaces are discussed. The IVS signal processing time is analyzed for multiple frequencies. A range of appropriate frequency and two hardware interfaces are proposed. A state-of-the-art FPGA design is employed as a first implementation approach for the IVS prototyping platform. This work can be used as an initial step to implement all the modules of the IVS on a single SoC chip.
American Journal of Electrical and Electronic Engineering. 2018, 6(1), 1-10. DOI: 10.12691/ajeee-6-1-1
Pub. Date: January 16, 2018
20156 Views3045 Downloads