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Second International Conference on the Reliability of Transmission and Distribution Equipment, 1995.

29-31 Mar 1995

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Displaying Results 1 - 25 of 37
  • The analysis of paper degradation by-products as a tool for monitoring fault conditions in oil-filled electric apparatus

    Publication Year: 1995, Page(s):79 - 84
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    Cellulosic materials are used for electrical insulation and mechanical support in power apparatus such as transformers and reactors. In order to evaluate the condition of the insulation system of this type of equipment, it is necessary to determine if the cellulosic materials are being degraded excessively. Several experiments were performed to determine the content of indicator by-products genera... View full abstract»

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  • Condition assessment techniques for large power transformers

    Publication Year: 1995, Page(s):85 - 90
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    An important task for electric utilities is to maintain the reliability of their power systems whilst minimising the necessity for capital expenditure on asset replacement. To achieve this, the best possible knowledge of the plant condition and likely future problems is required. Effective assessment techniques are required, and this is especially so for power transformers since these are very oft... View full abstract»

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  • The improvement of customer service by system automation [power distribution]

    Publication Year: 1995, Page(s):127 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    Distribution automation is practised to varying degrees around the world and is of interest to all power system engineers. Its importance has increased in the United Kingdom following privatisation of the electric utility industry and the consequently increased focus on customer service. The authors detail how Midlands Electricity has embarked on a re-definition of its power supply reliability sta... View full abstract»

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  • Proceedings Second International Conference on the Reliability of Transmission and Distribution Equipment (Conf. Publ. No.406)

    Publication Year: 1995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (12 KB)

    The following topics were dealt with: reliability diagnosis and plant failure statistics; design for reliability; condition monitoring; control and protection for improved reliability; distribution system reliability; replacement policies and worth assessment; risk analysis View full abstract»

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  • Transformer design for high reliability

    Publication Year: 1995, Page(s):66 - 72
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    As the population of power transformers in service increases and becomes older, electric utilities are focusing attention on the availability of their plant. Users assess availability in terms of: (1) dependability-whether the transformer will be available in the short term, i.e. over the next 5 years; and (2) reliability-whether the transformer will be available in the longer term, i.e. over the ... View full abstract»

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  • Reliability aspects in operational structuring of large-scale urban distribution systems

    Publication Year: 1995, Page(s):151 - 156
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    Distribution systems largely determine the service quality profile seen by end-customers and dominate overall reliability indices. The most frequent and most significant outages are those in the medium voltage feeder sections. This paper underlines the importance of the incorporation of service quality requirements into operational planning and structuring of medium voltage urban power networks. T... View full abstract»

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  • Reliability worth in distribution plant replacement programmes

    Publication Year: 1995, Page(s):162 - 167
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    Most of the distribution system plant in the United Kingdom was commissioned during the high growth years of the 50s and 60s and although some of this equipment may still be “operating satisfactorily”, most are approaching replacement need. The subject of asset replacement programmes is receiving an increased level of consideration and debate. However, since currently applied increment... View full abstract»

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  • Simulation-aided short circuit risk evaluation for circuit breakers in HV substations

    Publication Year: 1995, Page(s):175 - 179
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The application of a probabilistic method of circuit breaker failure evaluation is described. A simulation model based on the Monte Carlo method and a specially built computer program are presented. Conclusions are drawn from the results of risk analysis made for a selected part of the Polish power system View full abstract»

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  • Assessment of circuit capability and preparation of rating sheets

    Publication Year: 1995, Page(s):91 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The need to work power systems harder using the best knowledge of its capability is central to the objectives of the National Grid Company (NGC) Technology and Science Division (UK). This objective must be balanced by appropriate work on the impact of loading regimes on the life expectancy and maintenance requirements of the power system. This paper describes the development of a unified circuit r... View full abstract»

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  • Field experience and pollution monitoring of composite long rod insulators

    Publication Year: 1995, Page(s):204 - 209
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The Queensland Electricity Commission (QEC) has 16 years of field experience with various types of composite insulators on 110 kV to 275 kV transmission lines. Most of the insulators were first generation composites installed in clean and contaminated environments. In heavily contaminated areas, various forms of damage to the sheath and sheds were observed and a number of insulators flashed over. ... View full abstract»

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  • Determination of data for reliability analysis of a transmission system

    Publication Year: 1995, Page(s):19 - 23
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    Probabilistic methods for reliability evaluation of power systems are more consistent than deterministic ones. This is due to the stochastic nature of power systems. However the application of such methods to practical systems require the availability of the relevant reliability data. Jordan Electricity Authority (JEA) has started the process of evaluating such data for its generating system. The ... View full abstract»

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  • Reliability design approach for protection and control equipment for MV distribution networks

    Publication Year: 1995, Page(s):133 - 138
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Reliability is a main requirement for MV distribution networks. One of the key components is the protection and control equipment. Both functions have traditionally been implemented separately. However, the latest generation of numerical devices available in the market offers a high degree of integration of protection and control functions. Reliability data of conventional protection relays has be... View full abstract»

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  • Application of RCM to high voltage substations

    Publication Year: 1995, Page(s):186 - 191
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors describe how, in order to test and assess the benefits of the application of reliability centered maintenance (RCM) in the field of electrical networks, EDF has committed itself to a two year feasibility study on a 400 kV line bay. The use of reliability techniques has not only thrown light on the cost efficiencies potentially at stake, but has been a rewarding challenge in its own rig... View full abstract»

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  • Concepts of data for assessing the reliability of transmission and distribution equipment

    Publication Year: 1995, Page(s):1 - 6
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    This conference is concerned with reliability of transmission and distribution equipment. This authors argue that the concept of reliability can only be objectively assessed by quantifying the behaviour of the individual items of equipment and thus by monitoring, collecting and collating the associated reliability data. This data can then be used to both assess past performance and to predict like... View full abstract»

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  • Thermal capability assessment for transformers

    Publication Year: 1995, Page(s):103 - 108
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The reliability of transmission and distribution equipment is inevitably affected by service conditions, and particularly loading, e.g. average load, load variation, loading above nameplate rating and frequency of tap-changes. The ability of a transformer to cope with particular loading conditions will depend on the design involved. An important aspect of this design is the thermal capability of t... View full abstract»

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  • Extension of use of the maintenance-free VCB into the medium voltage GIS concept

    Publication Year: 1995, Page(s):31 - 36
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    This paper describes a new series of medium voltage gas insulated distribution switchgear which is, just as the vacuum circuit breaker which it uses, designed to be maintenance-free for its lifetime. Its use will increase the reliability, simplify and reduce the costs of operation of secondary distribution in public and industrial networks. Initially, this new series, type 8DC, is available with s... View full abstract»

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  • Maintenance-free vacuum circuit-breaker

    Publication Year: 1995, Page(s):37 - 42
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The introduction of vacuum switchgear represented the first step in the direction of a maintenance-free medium-voltage circuit-breaker. Switching in a vacuum was the first quenching principle to assure constant electrical and dielectric properties throughout the device's entire service life of more than 20 years, involving for example more than 100 short-circuit clearances or 10000 to 30000 switch... View full abstract»

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  • Intelligent optical fibre based systems for monitoring the condition of power equipment

    Publication Year: 1995, Page(s):73 - 78
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    Considerable advances have been made in recent years concerning the design, manufacture and, not least, the technologies used in the power equipment of today's transmission and distribution networks. For many items of power equipment, the methods traditionally applied, those of preventive maintenance to optimise equipment availability, can now be replaced by predictive maintenance philosophies whi... View full abstract»

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  • Co-ordinated protection and control upgrades substation reliability

    Publication Year: 1995, Page(s):121 - 126
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    Smart microprocessor based devices are now available for power system control and protection. They are intelligent and surpass the performance of their conventional predecessors by far, and are at the same time highly available due to inherent self-monitoring capabilities. They can communicate with each other and with higher control levels and provide valuable data for more effective and secure sy... View full abstract»

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  • Design for reliability-methodology and cost benefits in design and manufacture

    Publication Year: 1995, Page(s):61 - 65
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The importance of quality and reliability in all kinds of switchgear has increased. Quality and reliability have to be an integrated part of development activities. Reliability starts with the right design, followed by the choice of suitable material, using the relevant testing procedures and the appropriate manufacturing techniques, all accompanied by stringent quality control. So future oriented... View full abstract»

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  • Ranking of design criteria to improve rural network performance

    Publication Year: 1995, Page(s):145 - 150
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    The evaluation of different design criteria to improve the performance of a rural distribution network requires a broad approach to be taken in comparing technical improvements that could be implemented, with the corresponding benefits obtained. This paper describes the examination of an existing rural 11 kV network in Northern Ireland in need of improvement in performance. The basic improvement a... View full abstract»

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  • Prioritising supply infrastructure works using statistically based analyses

    Publication Year: 1995, Page(s):157 - 161
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    Like most other companies, London Underground is endeavouring to minimise its distribution network costs while providing the best possible service to its customers. In order to meet these aims, it is necessary to use the capital available to best effect. In London Underground's case, the problems of prioritising capital expenditure are especially difficult because of the diverse nature of the pote... View full abstract»

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  • Risk based design of distribution line structure

    Publication Year: 1995, Page(s):168 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    Power overhead line regulations and codes generally apply prescriptive methods to the design of structures using working loads multiplied by factors of safety. In contrast, the probabilistic method is founded on designing to a limit state in which strength is matched to stress, with the risk of failure defined by the overlap of the distributions of the limit state model. This work indicates how a ... View full abstract»

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  • Reliability and maintenance practices for Australian and New Zealand HV transmission lines

    Publication Year: 1995, Page(s):198 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    Electricity supply authorities throughout the world are under pressure to perform more efficiently and continue to meet demand yet face increasing environmental pressure not to construct additional transmission lines. This means that existing lines must work harder and last longer than ever before. Traditional maintenance activities based on standard inspection periods will need to be replaced by ... View full abstract»

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  • Transmission equipment reliability using the Canadian Electrical Association information system

    Publication Year: 1995, Page(s):13 - 18
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    Canadian electric power utilities have been collecting and processing transmission equipment reliability data as part of the Canadian Electrical Association Equipment Reliability Information System (CEA-ERIS) since 1978. Eight concurrent annual reports have been produced each covering a five year period. These data cover transmission lines, transformer banks, circuit breakers, cables, synchronous ... View full abstract»

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