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Forthcoming and recent changes in the regulated and liberalized markets set up new demands to system obligation companies to improve supply quality, operation efficiency and to still reduce total costs of network operation. Simultaneously owners expect higher returns on their investments. For traditionally natural monopolies balancing between these expectations can be hard tasks to achieve. The utilization...
This paper reports the power quality problems affecting industrial zones in Egypt like 6th October city, El-Obour city and Nasr city. Cairo Electricity Distribution Company (CEDC) has accomplished about 100 case studies in these zones according to the complaint of customers. Two different studies are shown here. The major purpose is to clarify the main problems affecting these industrial zones attempting...
Cables in distribution network had to carry on withstand voltage to check the insulation of the cable itself and its accessories during put into operation or during the preventing testing. But most of the cable pothead and its leads are keep in the switchgear cabinet where the clearances between phases or to ground are limited due to the compact design of the cabinets. The clearances cannot meet the...
This paper briefly explains information system which we made for “Elektrodistribucija” Kraljevo. Old information system contains accounting; billing system, part of technical information system. Our new information system (in next text Digi TIS) is 21st-century Windows-oriented software package for performing all technical tasks in distribution utilities in an efficient and optimal way. This modern...
This paper briefly explains technical information system which we made for “Elektrosrbija” Kraljevo, especially integration of SCADA into technical information system. Paper demonstrates how are includes programs and device of independent producer in the technical information system. Technical information system must include all tasks which exist in technical sphere of power supply company. One of...
AEM Elettricità is the company of AEM group spa which supplies electricity to Milan and the nearby town of Rozzano. In 2002, AEM Elettricità acquired the remaining supply network and business branch of Enel Distribuzione in Milan, thus becoming the sole supplier of electricity in the area of the above mentioned cities. This was made possible by the “Bersani Law Decree” which liberalized the market...
With the advent of deregulation in Electric industry, mergers and acquisitions have become common phenomena. Such mergers and acquisitions often result in the change of asset ownership. This paper aims at identifying the challenges faced by a utility when it acquires assets of another utility. This paper presents in-depth analysis of such issues and recommends a holistic approach to handle these scenarios.
The excellent electrical insulation properties of FRP) fiber glass reinforced pole) combined with their high strength makes them the preferred choice for many electrical and telecommunication applications. Transmission and distribution poles built from FRP are characterised with low maintenance, ease of installation, light weight and non conductive material.
Pursuant to the law n°2004–803 dated august 9th 2004, the French eligible market opened to competition in 2000 was extended to all non household customers from July 1st 2004 on. The aim of this paper is to provide an update on the recent regulatory changes, that were required to implement this extension. It also underline the scope of the changes for distribution system operators in France. It also...
Eskom participates in South Africa's electrification program which started in 1992 and is still continuing. Eskom made 350 000 connections per year at the peak of the program. Eskom lead the industry in reducing first capital costs in the program by more than 50%. [1]
The purpose of this paper is to identify and describe the key enabling roles that SiC power semiconductor devices will play in future envisaged electricity networks. Prospective SiC devices have higher voltage rating, are faster switching and can operate at higher temperature than their Si counterparts. Hence power electronic (PE) equipment using SiC devices will have, not only much lower dissipation,...
To ensure the reliability of an accessory it is subjected to a type test. These type tests, either conform national or international standards, comprise a multitude of electrical tests. An important part of this type tests is the heating cycle voltage test in which the thermomechanical behaviour of an electrically stressed accessory is tested. Based on the IEC 60502–4 this heating cycle voltage test...
Graninge Kainuu Oy reformulated its strategy and significantly restructured its operations at the end of the year 2001. A cooperation agreement signed with Eltel Networks and outsourcing network construction and maintenance operations to Eltel Networks were part of the changes made. As a result of the restructuring, the number of the company's employees fell by 60%. The restructuring also affected...
The CableSniffer is an intuitively simple device to pinpoint Low Voltage (LV) cable faults. It operates by “sniffing” the gases given off by faulting LV cables as the cable insulation burns.
Voltage regulation in Medium Voltage networks is approached in two main different ways: load-dependent (compounding) and load-independent regulation. In order to adopt a unified method for the utility Nuon, both have been compared. Because of its sensitivity to load patterns, cogeneration is a distortion factor for compounding. This is why there are different visions on whether or not compounding...
The paper describes total (technical and non-technical) losses modelling for distribution networks operated by EDF in Metropolitan France. The model is based on a trinomial formula given by a regression linking the power flow at the substations level with the load at low voltage (LV) and medium voltage (MV) levels. Due to its time depending behaviour, the model allows: — market operators to complete...
Aim of the Directive and conformity demonstration The MID, intended to facilitate the placing on the market of a wide range of measuring instruments, will apply to electricity meters. The MID is a ‘New Approach’ directive, amongst other things setting basic Essential Requirements (ERs). The MI-003 annex gives the particular requirements for electricity meters. The directive does not give the test...
The Geneva city utility SIG operates a large medium / low voltage distribution network with a high number of distribution transformers in place. Within the last approx. 4 years an unusual high number of transformer failed due to a premature aging. These units were all delivered between beginning of 1996 until mid 1999. Only sizes of 630 kVA and 1000 kVA were affected. Within other MV networks as well...
Gas and electricity distribution in Belgium is the responsibility of the regions. As a result, the liberalisation of the markets is organised differently in the country's three regions. In Flanders (60% of customers), the entire market has been liberalised since 1 July 2003. In the two other regions, Wallonia (25%) and Brussels (15%), HV-HP (High Voltage-High Pressure) customers and business customers...
The Swedish electricity network comprises three levels: the national transmission grid, regional and local distribution. The national grid (400–220 kV), owned by Svenska Kraftnät, is about 15,000 km long. Three companies mostly own the 31000 km-long regional network (130–40 kV). The local network is owned by 180 network operators serving 6,500 high-voltage (10–130 kV) and 5.2 million low-voltage (400/230...
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