Masters Theses in the Pure and Applied Sciences
Masters Theses in the Pure and Applied Sciences

Author: Wade Shafer

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 335

ISBN-13: 1461337003

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

New Methodology for the Assessment of Decayed Utility Wood Poles
New Methodology for the Assessment of Decayed Utility Wood Poles

Author: Fernando J. Tallavó

Publisher:

Published: 2009

Total Pages: 244

ISBN-13:

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Wood is one of the oldest and most common material used in construction. Since the beginning of the electrification in Canada in late 19th-century, wood poles have been widely used to provide structural support to electric transmission and distribution lines. For example, electrical network in Ontario has over 2 millions distribution poles across the province. Wood poles are typically exposed to severe environmental conditions, which cause deterioration due to wood rotting, insect attack, and weathering. The wood deterioration resulting in loss of strength can compromise the structural integrity of poles. Typical life expectancy of wood varies from 35 to 50 years depending on the environmental condition and type of wood. Electrical distribution infrastructure in Canada is aging. For example, the average age of in-service wood poles in Ontario is estimated to be 29 years with a standard deviation of 15 years. About 300,000 wood poles have been in-service for more than 45 years, which are rapidly reaching to end of expected service life. Different types of non-destructive testing (NDT) methods have been historically used for the condition assessment of wood poles. However, current methods are based on simple concepts that do not consider the variations of wave velocity and wave attenuation in an orthotropic material. The goal of this research investigation is to develop an advanced and reliable NDT technique for in-situ inspection and assessment of wood poles in order to remove unsafe poles from service, extend the service life of sound poles, and support optimum replacement strategies for the renewal of wood pole infrastructure. The thesis presents a new methodology for condition assessment of wood poles using ultrasonic testing based on theoretical, numerical, and experimental studies. The research covers areas such as signal processing, dynamic characterization, statistical reliability analysis, numerical simulations, and laboratory testing.

Probability Concepts in Electric Power Systems
Probability Concepts in Electric Power Systems

Author: George J. Anders

Publisher: Wiley-Interscience

Published: 1990-01-25

Total Pages: 714

ISBN-13:

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Modern Power System Analysis Turan Gönen The first book on electrical power systems to deal exclusively with the design, structure, and analysis of the transmission system itself. Serves as a self-study guide or as a classroom text and describes, step-by-step, all the tools and procedures needed to analyze today’s electrical power systems. It covers power system planning, steady-state performance of transmission lines, disturbance of the normal operating conditions and other problems, as well as symmetrical components and sequence impedances. The book also analyzes balanced and unbalanced faults, land flow, and system protection, detailing criteria for protective systems and several types of relays. 1988 (0 471-85903-6) 560 pp. Least-Cost Electric Utility Planning Harry G. Stoll Presents all the key elements and tools necessary to plan and operate efficient electric utility power systems. Its seven sections address: economics, finance, and regulation; industrial power economics; load demand and management; reliability of the generation system; cost of production in the generation system; capacity planning; and transmission planning. Each section addresses power system theory and principles and applies them to realistic utility examples. Results from solved examples are expanded to illustrate the sensitivity and direction of key parameters. 1989 (0 471-63614-2) 782 pp.

The Effect of Woodpecker Damage on the Reliability of Wood Utility Poles
The Effect of Woodpecker Damage on the Reliability of Wood Utility Poles

Author: Olivier Daigle

Publisher:

Published: 2013

Total Pages:

ISBN-13:

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Hydro One, a major distribution of electricity in Ontario, has reported that approximately 16,000 of the wood utility poles in its network of two million poles have been damaged by woodpeckers. With a cost of replacement of approximately $4000 per pole, replacing all affected poles is an expensive enterprise. Previous research conducted at UW attempted to quantify how different levels of woodpecker damage affected the pole strength. In the course of this research, some shear failures were observed. Utility poles being slender cantilevered structures, failures in shear are not expected. The objectives of this study were to determine the effective shear strength of wood utility poles and to determine the reliability of wood utility poles under different configurations, including poles that had been damaged by woodpeckers. An experimental programme was developed and conducted to determine the effective shear strength of wood poles. Red Pine wood pole stubs were used for this purpose. The stubs were slotted with two transverse half-depth cuts parallel to one another but with openings in opposite directions. A shear plane was formed between these two slots. The specimens were loaded longitudinally and the failure load was recorded and divided by the failure plane area to determine the shear strength. The moisture content of each specimen was recorded and used to normalize each data point to 12 % moisture content. The experimental study showed that the mean shear strength of the Red Pine specimens adjusted to 12 % moisture content was 2014 kPa (COV 47.5 %) when calculated using gross shear area, and 2113 kPa (COV 40.5 %) when calculated using net area. The shear strength of full-size pole specimens can be represented using a log-normal distribution with a scale parameter of [lambda] = 0.5909 and a shape parameter of [zeta] = 0.5265. iii The reliability of Red Pine wood utility poles was determined analytically. A structural analysis model was developed using Visual Basic for Applications in Excel and used in conjunction with Monte Carlo simulation. Statistical distribution parameters for wind loads and ice accretion for the Thunder Bay, Ontario region were obtained from literature. Similarly, statistical data were obtained for the modulus of rupture and shear strength from previous research conducted at UW as well as the experimental programme conducted in this research. The effects of various properties on reliability were tested parametrically. Tested parameters included the height of poles above ground, construction grade, end- of-life criterion, and various levels of woodpecker damage. To evaluate the results of the analysis, the calculated reliability levels were compared to the annual reliability level of 98 % suggested in CAN/CSA-C22.3 No. 60826. Results of this reliability study showed that taller poles tend to have lower reliability than shorter ones, likely due to second-order effects having a greater influence on taller poles. The Construction Grade, a factor which dictates the load factors used during design, has a significant impact on the reliability of wood utility pole, with poles designed using Construction Grade 3 having a reliability level below the 98 % threshold. Poles designed based on Construction Grade 2 and 3 having reached the end-of-life criterion (60 % remaining strength) had reliability below this threshold whilst CG1-designed pole reliability remained above it. Wood poles with exploratory- and feeding-level woodpecker damage were found to have an acceptable level of reliability. Those with nesting-level damage had reliability below the suggested limits. Poles with feeding and nesting damage showed an increase in shear failure. The number of observed shear failure depended on the orientation of the damage. Woodpecker damage with the opening oriented with the neutral axis (i.e., the opening perpendicular to the direction of loading) produced a greater number of shear failure compared to woodpecker damage oriented with the extreme bending fibres.