Electric Power Transmission

PurposeThe purpose of this paper is to propose a new outer‐rotor permanent‐magnet flux‐switching machine (ORPMFSM) for electric vehicle (EV) in‐wheel propulsion. The paper documents both the design procedure and performance investigation of this novel machine.Design/methodology/approachThe topology and preliminary sizing equations of the ORPMFSM are introduced. The rotor poles are optimized, whilst the machine losses are particularly investigated, using 2‐D finite element analysis (FEA).FindingsAn ORPMFSM, with 12 stator poles and 22 rotor poles, is most suitable for the proposed EV application. The analytical sizing equations are quite efficient with a sufficient accuracy for the preliminary design. The optimal rotor pole width from the FEA results is nearly 1.3 times the original value which was proposed in early literatures. The efficiency of the proposed machine under rated load is slightly low, as a result of significant eddy current losses in the permanent magnets. The losses ...

Overhead transmission lines have been used for decades in the transmission high voltage power from generation point to consumer point. Several factors such as weather condition losses and virtual impacts have led to alternative transmission technology that would address those challenges. Underground power cables are a viable alternative to overhead transmission lines when proper considerations are given to many details of using those types of systems. Cables have different characteristics than overhead lines that must be factored into design, reactive compensation, operation and maintenance and repair. This work provides introduction into cable types and presents overview into consideration for using underground cables. Discussion here focusses on transmission cables, but also relevant to distribution cable application

The use of fuzzy and adaptive neuro-fuzzy technique for fault detection, classification and location is presented in this study. Ten different types of electrical faults in a transmission line were investigated. The results obtained show that a high degree of accuracy was recorded for detection, classification and location of electrical faults in the extra-high voltage line. Ongoing studies on the subject are expected to further improve levels of accuracy in fault classification and location especially.

: This thesis is an exploration of microwave wireless power transmission (WPT) for micro-air vehicles (MAVs). WPT, converting radio frequency (rf) power into usable direct current (dc) power, can be implemented with a rectifying antenna, or rectenna. The emphasis of this thesis is on the simulation of rectenna efficiency and measurement of experimental hardware. In this thesis, power reflection in the rectifier matching circuit was investigated by a series of simulations using Agilent Advanced Design System (ADS). Tuning elements were added and adjusted in order to optimize the efficiency. A maximum efficiency of 57% was obtained at 10 gigahertz (GHz) with 200 mW input to the rectenna. A full-wave rectenna was built and hardware experiments were conducted to measure the efficiency of the WPT and characterize the behavior of the circuit. The design is optimized for an input power of 200 mW but, because of hardware limitations, only low-input power levels (about 1 mW) could be tested....

Unlike most accounts of the origins of Silicon Valley, this essay insists that the valley today is rooted in the Gold Rush, and only through understanding this can scholars fully comprehend the roots of the innovation process that so characterizes the region today. The Gold Rush began a long gestation period in the region’s technical sciences that, with its physical, economic and geographic characteristics, comprised a petri dish in which innovations flourished. Early on communities of interest emerged among the original Argonauts around hydraulic engineering and among later adventurers around hydroelectric power, electric-power transmission, radio technology and microwave electronics. Over the years their members included mechanics, inventors, engineers, academics and entrepreneurs, and they found like-minded souls in San Francisco Bay Area technical and scientific organizations, social clubs and educational institutions, where they all overlapped with each other and created the foundations for the modern Silicon Valley.

This paper presents Mathematical Morphological applications to assess the performance of High Voltage Direct Current system. The satisfactory performance of this system is one of the necessary conditions to obtain uninterrupted power supply as it is transmitting bulk power over a long distance. In this paper a 300 kM long HVDC system is simulated for various faults on the DC line and a technique to locate the faults on the DC line is proposed. The simulated results presented in this paper are in good agreement with the published work.

This paper investigates travelling wave based protection schemes developed for high voltage transmission systems and their adaptation to medium voltage distribution networks in order to enable ultra high speed relaying (within a quarter of a cycle of the power frequency) on a medium voltage level. This further demonstrates that the travelling wave based protection provides a high speed and very accurate fault detection. The given method compares the polarities of current and voltage travelling waves measured immediately after the fault inception to determine the fault direction.

In this article, we present our investigations on the radiation of the power-line communication (PLC) system. Power line communication or power line carrier is a technology for carrying data on a conductor usually dedicated to electric power transmission. At high frequency, the power lines, whose are dimensioned and adjusted for electrical energy transfer, not to carry high frequency (HF) data signal, act then as radiating antennas.

The use of fuzzy and adaptive neuro-fuzzy technique for fault detection, classification and location is presented in this study. Ten different types of electrical faults in a transmission line were investigated. The results obtained show that a high degree of accuracy was recorded for detection, classification and location of electrical faults in the extra-high voltage line. Ongoing studies on the subject are expected to further improve levels of accuracy in fault classification and location especially.

The last decades the concern of the public, regarding the possible affects from the exposure to magnetic and electric fields, has grown considerably. This is because the generation, transmission and distribution of electric power are accompanied with the presence of the above mentioned fields. This paper attempts to illustrate the values of the resultant magnetic field in the low frequency

Purpose – This paper aims to deal with evaluation of different parameters of an induction programme conducted by a transmission and distribution major in India. The study aims to indicate which aspects of the training programme need to be emphasised when devising induction ...

A survey of the methods proposed in the literature to evaluate the effect of nearby lightning strokes on electric power transmission/distribution circuits is performed, describing the assumptions taken as well as the mathematical tools applied at each of the simulation stages of the physical phenomena. A comparison is made between the approaches proposed by Master & Uman [1984] and Chowdhury