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Generation, Transmission and Distribution, IEE Proceedings C

Issue 1 • Date Jan 1988

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Displaying Results 1 - 9 of 9
  • Power projects: the role of the contractor

    Publication Year: 1988 , Page(s): 1 - 8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (892 KB)  

    The author describes the development of contracting from the early days to the emerging role of the lead contractor in major overseas power projects today. The look at history shows how the role of the contractor has evolved in parallel with the development of the UK power industry. The significance of the concept of UK Ltd. is discussed together with the important role of the lead contractor with strong project management skills and experience to bring together not only technical and construction activity but also commercial and financial aspects of a large construction project. Developments in opportunities for renewable energy projects at home and overseas are reviewed. The author concludes with a reference to the challenge facing contractors in the changing scene worldwide in power sector construction projects View full abstract»

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  • Dynamic response analysis of marine power systems

    Publication Year: 1988 , Page(s): 74 - 78
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    A computer simulation method for predicting the dynamic responses of a marine power system containing both AC and DC subsystems is proposed. The method has to important features. First, it allows modelling of system components in modular form and representation of network relations by utilising Kirchhoff's current law, hence providing flexibility in model building and testing. The second feature in its ability to simulate the performance of DC machines and converters in a combined AC/DC system. The paper contains a description of the method and its application to a practical marine power system. Simulation results are practically verified by comparing with a manufacturer's supplied experimental data View full abstract»

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  • Thermal analysis of a multicore cable

    Publication Year: 1988 , Page(s): 79 - 80
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (160 KB)  

    A multicore reeled cable on load is analysed by the thermal network method and by limited experimental work. Overheating of the insulation is found to be possible if the rated current is drawn for several hours View full abstract»

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  • Computation of temperature field and moisture content in the vicinity of current carrying underground power cables

    Publication Year: 1988 , Page(s): 51 - 62
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (892 KB)  

    A new method of numerically modelling coupled heat and moisture flow around power cables in steady state and time varying conditions based on the Philip and De Vries model for flow in soils is presented. The method has been implemented within a computer program for an IBM or compatible personal computer which utilises the Galerkin approach in the finite element method. The program employs advanced, sparsity-based algorithms which can handle large finite element grid structures and calculate accurately the steady state and time dependent temperature and moisture distributions and isothermal contours for power cables buried in media containing complex configurations of soil, boundaries, heat sources and sinks. Validation of the program has been achieved with data from field tests. A good comparison between predicted and measured results was obtained View full abstract»

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  • A new monitor for pollution on power line insulators. II. Simulated field tests

    Publication Year: 1988 , Page(s): 24 - 30
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    For pt.I see ibid., vol.133, no.2, p.105-8 (1986). An apparatus is developed for monitoring the leakage currents drawn by an insulator chain of a power line or a busbar support in a polluted atmosphere. The apparatus monitors the insulator pollution by sensing and analysing the leakage current bursts. If these bursts are judged by the apparatus as corresponding to a potentially dangerous pollution level, the apparatus transmits an alarm signal to the service crew to allow them to clean the insulators of the line or substation in time before a sudden line outage occurs, with the entailed excessive expense, loss of power supply and annoyance to customers. It has undergone numerous tests with artificially polluted insulators in the high voltage laboratory. These tests are the subject of the present paper View full abstract»

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  • Scheme, based on travelling-waves, for the protection of major transmission lines

    Publication Year: 1988 , Page(s): 63 - 73
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (824 KB)  

    The authors give details of development work on a protective scheme based on the travelling waves present on major transmission lines after the incidence of faults. The basic principle of the scheme is outlined. Analytical treatment, based on an ideal single-phase line, is included to indicate how the initial travelling wave propagated from a fault and a later wave resulting from a reflection at the fault position may be identified. Indication is given of the differences resulting from faults both on an external to a protected line, and discriminatory checks which could be incorporated are outlined. The application of the scheme to 3-phase lines is considered and a further discriminatory check is described. To demonstrate the potential of the proposed scheme, its responses to a number of fault conditions are provided View full abstract»

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  • Computer-based supervisory control and energy management system for the city of Cape Town

    Publication Year: 1988 , Page(s): 41 - 50
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (892 KB)  

    Cape Town City Council is responsible for the supply of electricity to the city area. To achieve this, the council owns and operates thermal and pumped-storage power stations and extensive HV transmission and LV distribution networks. Power is also purchased from the national supply authority. To assist the operators in their duties a new computer-based control centre has been developed and was commissioned in 1984. Because of the unusual mix of power sources special software had to be developed for energy management purposes. Descriptions are given of the functional and practical aspects of the control centre, and of associated hardware and software facilities and also some commissioning experiences View full abstract»

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  • Network parameter estimation using online data with application to transformer tap position estimation

    Publication Year: 1988 , Page(s): 31 - 40
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (864 KB)  

    The authors deal with the estimation of parameters involved in the classical steady-state modelling of network elements within the context of power system state estimation. A general method is proposed for the identification and correction of the real-time data, based on the sensitivity relationship between the measurement residuals and the parameter error; this relationship is treated as an estimation problem, yielding a parameter error estimate. Special emphasis is put on the real-time correction of erroneous transformer tap positions, the most frequent parameter errors during the real-time operation of state estimators. Relationships with other methods are also discussed. Simulation results on a real-life system are reported View full abstract»

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  • Supertension or superconducting cables. 20 years on-can the UK regain the lead?

    Publication Year: 1988 , Page(s): 9 - 23
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2780 KB)  

    Progress made since 1967 is reviewed and it is found that the UK has lost the lead in all areas of high power cable technology except for paper insulated oil-filled cables. Activities during this period are summarised with special regard to superconducting cables where the recent discovery of high-temperature superconductors has stimulated interest again. The future prospects for the UK high-power cable industry are analysed in the light of the downtrend in the UK in both the supply of research and development staff and of research funding from both industry and Government sources View full abstract»

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