scholarly journals Condition Assessment of Power Transformers Based on Health Index Value

2019 ◽  
Vol 9 (22) ◽  
pp. 4877 ◽  
Author(s):  
Patryk Bohatyrewicz ◽  
Janusz Płowucha ◽  
Jan Subocz
Keyword(s):  
Power Systems ◽  
Technical Condition ◽  
Point Of View ◽  
Power Transformers ◽  
Health Index ◽  
Proper Selection ◽  
Alternative Result ◽  
Index Value ◽  
Index Calculation ◽  
Selection Of

In electric power systems, health index algorithms are mostly used for evaluation of the transformer population. In this method, some assessment criteria are insensitive when it comes to judging the technical state of the edges of the age spectrum. This paper presents a new health index calculation method that aims to improve the overall effectiveness of the assessment. The proposed algorithm is based on regularly conducted oil diagnostics and easily available maintenance data to enable estimation and updating of the device’s health status in short intervals from an operational point of view. This method is compared to another health index algorithm built from the same parameters, but with different weights and an alternative result assessment philosophy. The two health index calculation methods are tested on a population of 96 power transformers and then compared to results obtained with an expert system, which is based on much more advanced diagnostic tests to determine the technical condition of the unit. The results of the experiment show that proper selection of weighting factors of the transformer’s technical condition parameters during health index calculation may help in simplifying its assessment while maintaining satisfactory accuracy in comparison to a highly advanced expert method.

Power Transformers Health Index Calculation Method Based on Cloud Model and Fuzzy Evidential Reasoning

2014 ◽  
Vol 1070-1072 ◽  
pp. 1021-1028
Author(s):  
De Hua Cai ◽  
Xi Yang ◽  
Rui Chuang Wang ◽  
Cheng Zhi Ma ◽  
Jin Cheng ◽  
...  
Keyword(s):  
Calculation Method ◽  
Cloud Model ◽  
Evidential Reasoning ◽  
Evaluation Index ◽  
Power Transformers ◽  
Health State ◽  
Health Index ◽  
Degree Of Belief ◽  
Fuzzy Evidential Reasoning ◽  
Index Calculation

Transformers health index calculation method based on cloud model and fuzzy evidential reasoning is proposed. According to the multi-level and multifactor of evaluation index information of power transformers, a layered evaluation index model is established. In order to deal with the ambiguity and uncertainty information of evaluation index, a normal cloud model is introduced, inferred the fuzzy degree of belief in the health state of evaluation index. Then use the fuzzy evidential reasoning method merge information of evaluation Index, inferred the degree of belief in the health state-level of transformer, calculated the health index of transformer. The results of an example analysis test its rationality and effectiveness.

scholarly journals Stability analysis of the Kosciuszko Mound using terrestrial laser scanner and numerical modelling

2018 ◽  
Vol 66 ◽  
pp. 01018
Author(s):  
Elżbieta Pilecka ◽  
Karolina Tomaszkiewicz
Keyword(s):  
Stability Analysis ◽  
Laser Scanner ◽  
Technical Condition ◽  
Point Of View ◽  
Terrestrial Laser Scanner ◽  
The Finite Element Method ◽  
Anthropogenic Soils ◽  
Differential Model ◽  
The Stability ◽  
Selection Of

Landslides which form in anthropogenic soils are complicated from a geological engineering and geotechnical point of view. Each case requires a detailed investigation and the selection of effective reinforcements is a difficult project issue. The study presents the problem of the stability analysis of landslides occurring in the anthropogenic soils of the Kosciuszko Mound in Cracow. The previously performed protections are discussed to highlight their ineffectiveness and the current technical condition of the mound is also presented. By overlapping the results of displacement measurements made with a terrestrial laser scanner, a differential model of the terrain was created which made it possible to determine the size and direction of the deformation of the slopes of the mound and the tendencies for the development of landslide movements in this area. A cross-section, selected on the basis of the model, was numerically analysed using the finite element method (FEM) in the Midas GTS NX program. As a result of the analysis, the values of the displacements and strains occurring in the Mound were calculated. On the basis of the value of the safety factor obtained, it was also possible to assess the risk of landslide movements.

scholarly journals Application of the Firefly Algorithm for Solving the Economic Emissions Load Dispatch Problem

2011 ◽  
Vol 2011 ◽  
pp. 1-23 ◽  
Author(s):  
Theofanis Apostolopoulos ◽  
Aristidis Vlachos
Keyword(s):  
Power Systems ◽  
Power Plants ◽  
Firefly Algorithm ◽  
Environmental Concerns ◽  
Proper Selection ◽  
Cambridge University ◽  
Nature Inspired Algorithm ◽  
Conflicting Objectives ◽  
Alternative Techniques ◽  
Selection Of

Efficient and reliable power production is necessary to meet both the profitability of power systems operations and the electricity demand, taking also into account the environmental concerns about the emissions produced by fossil-fuelled power plants. The economic emission load dispatch problem has been defined and applied in order to deal with the optimization of these two conflicting objectives, that is, the minimization of both fuel cost and emission of generating units. This paper introduces and describes a solution to this famous problem using a new metaheuristic nature-inspired algorithm, called firefly algorithm, which was developed by Dr. Xin-She Yang at Cambridge University in 2007. A general formulation of this algorithm is presented together with an analytical mathematical modeling to solve this problem by a single equivalent objective function. The results are compared with those obtained by alternative techniques proposed by the literature in order to show that it is capable of yielding good optimal solutions with proper selection of control parameters.

scholarly journals Informative Value of Packaging as a Determinant of Food Purchase

2020 ◽  
Vol 36 (2) ◽  
pp. 31-44
Author(s):  
Magdalena Ankiel ◽  
Mariola Grzybowska-Brzezińska
Keyword(s):  
Food Packaging ◽  
Storage Conditions ◽  
Point Of View ◽  
Information Value ◽  
Purchasing Decisions ◽  
Proper Selection ◽  
Product Packaging ◽  
Food Market ◽  
Concept Of Information ◽  
Selection Of

AbstractThe purpose of the article is to present the concept of information value of food packaging, characterize determinants of information value and present the results of own research on the identification of key information on packaging affecting purchasing decisions of food consumers. Unit packaging constituting an inherent element of food products equipment should fulfill numerous, overlapping functions, which include: protection, transport andinformation — functional, as well as ecological and promotional. One of the priority functions of product packaging (not just food) is the informative function. It is assumed that the proper selection of information encoded on the packaging should inform the consumer exhaustively, reliably and comprehensively about the packed product, its composition, nutritional values or storage conditions. Analyzing the information included on food packaging, it can be stated that entities introducing these products onto the market still show a tendency to “excessively” label the packaging (as part of optional labeling). It is therefore reasonable to specify what information is analyzed by consumers in the purchasing process and what information constitutes the information value of unit packets from the point of view of individual consumers. The above will allow identifying key determinants of the information value of packaging and may constitute valuable information for entities introducing products to trade in the field of proper selection of characters and codes of unit packets on the food market.

Meriel Talbot and the Society for the Overseas Settlement of British Women, 1919–1937

2017 ◽  
Vol 10 (1) ◽  
pp. 32-52
Author(s):  
Bonnie White
Keyword(s):  
Domestic Service ◽  
Agricultural Workers ◽  
British Government ◽  
Early Failure ◽  
Proper Selection ◽  
Domestic Servants ◽  
Female Workers ◽  
Female Migrants ◽  
Post War ◽  
Selection Of

In 1917 the British government began making plans for post-war adjustments to the economy, which included the migration of surplus women to the dominions. The Society for the Overseas Settlement of British Women was established in 1920 to facilitate the migration of female workers to the dominions. Earlier studies have argued that overseas emigration efforts purposefully directed women into domestic service as surplus commodities, thus alleviating the female ‘surplus’ and easing economic hardships of the post-war period. This article argues that as Publicity Officer for the SOSBW, Meriel Talbot targeted women she believed would be ideal candidates for emigration, including former members of the Women's Land Army and affiliated groups. With the proper selection of female migrants, Talbot sought to expand work opportunities for women in the dominions beyond domestic service, while reducing the female surplus at home and servicing the connection between state and empire. Dominion authorities, whose demands for migrant labour vacillated between agricultural workers during the war years and domestic servants after 1920, disapproved of Talbot's efforts to migrate women for work in agriculture. Divergent policies led to the early failure of the SOSBW in 1923.

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