Journal Staff

There is an international tendency toward increased demand for both cost-efficiency and high reliability of power distribution systems. To meet these demands, asset management methods, including reliability analyses, have been developed. These reliability analyses often utilize only mean values and hence do not take into consideration the consequences of severe events. This paper proposes a framework for more detailed quantitative risk analysis methods. The aim is to allocate resources more cost-effectively. The suggested framework is exemplified and evaluated by implementing it within the analyses of a real power distribution system. The main concept is to divide comprehensive projects into minor analyses and then in a final step compile the results. The proposed analysis framework can be used independently or combined with earlier proposed vulnerability methods. The latter provides a two-dimensional analysis framework. It is shown that totally different investment alternatives could be preferred depending on whether a traditional analysis method using average values is employed compared with the proposed analysis framework, which also considers severe system states. This demonstrates the risks involved in using average values and the strength of the proposed method. Furthermore, it is shown that already available information can be used for improved asset management decision support. In addition, the performed case study gives combined reliability and weather statistics useful as reference material.QC 20150123</p

Analys av en statlig utredning – en diskursanalys om hur missbruk, beroende, tvång och individ beskrivs i missbruksutredningen (SOU 2011:35)

The purpose of this study was to analyze from a discourse analytic perspective how The Substance Abuse commissions final report, Improved interventions for substance abuse and dependence - the individual, knowledge and responsibility (SOU 2011:35) (Bättre insatser vid missbruk och beroende – individen, kunskapen och ansvaret), chapter 7, constructs discourses in relation to concepts such as substance abuse, substance addiction and the individual in relation to coercion. The starting point of the study was that through a qualitative approach in the form of critical discourse analysis and discourse theory analyze different concepts. We found three different discourses in the context of SOU 2011:35, chapter 7. The analysis found that a medical discourse has come the farthest in a striving for hegemony in the construct of substance abuse and substance dependence, as well as the individual came to appear as distinct depending on the perception of substance abuse and substance addiction, as well as the measures advocated. A social discourse and penal discourse is less perceptible in SOU 2011:35. This also has implications for what SOU 2011:35 proposes a change to legislation

Fault Management at a Distribution System Operator

This paper describes the fault management at a distribution system operator (DSO) including all steps, from detection to restoration. Differences in this work depending on equipment available are compared such as remote versus manual disconnectors. Often, in reliability models of power distribution, a restoration time is assumed; sometimes divided into parts such as an identification time and a repair/switching time. The approach is to describe the actual work by interviewing several people working at a DSO. Furthermore results from a former study at the same DSO are summarized to provide a complete picture of the asset management at a DSO. The aim of this study is to provide a detailed description of actual work to use as reference when developing more comprehensive analysis methods. Another possible usage is to improve current asset management by e.g. identify potential improvements in working methods using existing equipments or to use as input to project planning. These kinds of studies decrease the gap between theoretical models and the reality of workers at DSOs, which probably is the most important contribution of this paper.QC 20130617</p

Shared calendar implementation in a company

Jebkura uzņēmuma veiksmīgas darbības pamatā ir lietderīga laika izmantošana, kuras realizēšanai nepieciešams veikt uzņēmuma darbu plānošanu. Bieži vien uzņēmumos netiek nodrošināta centralizēta datu apmaiņa starp darba devēju un darbinieku un tas rada risku, ka noteiktie uzdevumi netiek veikti kvalitatīvi un noteiktajā laikā. Lai risinātu šādas problēmas, daudzu uzņēmumu vadītāji spiesti meklēt kvalificētus speciālistus šādas darbu plānošanas programmatūras izstrādei vai arī iegādāties kādus no komerciālajiem risinājumiem, visbiežāk abos no minētajiem variantiem uzņēmumu vadība saskaras ar augstām izmaksām par programmatūras izstrādi, ieviešanu un apkalpošanu, pilnībā izslēdzot iespējas lietot kādu no bezmaksas risinājumiem. Darbā tiks apskatīta risinājuma uzstādīšana, ieviešana, drošība, uzturēšana un atjaunināšana.Any company's success is based on effective use of time, which requires working by strictly detailed plan. Often companies do not provide a centralized data exchange between employers and employees, and it pose a risk that the tasks are not executed qualitative and on time. To solve such problems many companies are forced to search qualified professionals, to plan that kind of software or they need to buy expensive commercial solution. The companies exclude opportunities for using some of the free software. The paper explores a solution to installation, implementation, security, maintenance and updating

A Pre-Study Towards Investigating the Art of Choosing Right Level of Input Data

The international tendency towards quality regulation of power distribution tariffs, along with a generally increased pressure of cost efficiency with maintained high reliability, give incentives to introduce more advanced analysis methods within asset management and project planning. This paper proposes a method to compare existing analysis methods with other methods or improvements of current method without perform any sharp changes in the organization. The approach is to compare recently performed risk reducing investments, based on current analysis methods used by the company, and then perform a hypothetical investment planning process based on more comprehensive reliability analysis. This paper presents results from a pre-study of a collaborative project between the industry and the academy to highlight and investigate the art of choosing right detail level of input data used within reliability analysis of power distribution. The aim of the paper is also to: on one hand provide academic reference material from the “reality”, and on the other hand to inspire the industry to review their current analysis methods and if needed, implement improvements. QC 20120061

A Pre-Study Towards Investigating the Art of Choosing Right Level of Input Data

Abstract-The international tendency towards quality regulation of power distribution tariffs, along with a generally increased pressure of cost efficiency with maintained high reliability, give incentives to introduce more advanced analysis methods within asset management and project planning. This paper proposes a method to compare existing analysis methods with other methods or improvements of current method without perform any sharp changes in the organization. The approach is to compare recently performed risk reducing investments, based on current analysis methods used by the company, and then perform a hypothetical investment planning process based on more comprehensive reliability analysis. This paper presents results from a pre-study of a collaborative project between the industry and the academy to highlight and investigate the art of choosing right detail level of input data used within reliability analysis of power distribution. The aim of the paper is also to: on one hand provide academic reference material from the &quot;reality&quot;, and on the other hand to inspire the industry to review their current analysis methods and if needed, implement improvements