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Physical Science, Measurement and Instrumentation, Management and Education - Reviews, IEE Proceedings A

Issue 8 • Date November 1986

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Displaying Results 1 - 11 of 11
  • Study of airgap breakdown characteristics under ambient conditions of reduced air density

    Publication Year: 1986 , Page(s): 485 - 492
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (706 KB)  

    The paper summarises data and preliminary observations arising out of engineering and physical studies of airgap breakdown at a moderately high altitude (1425 m), outdoor high-voltage research laboratory in South Africa. It is shown that in the case of positive switching impulses, the application of the present standard IEC atmospheric correction procedures can yield results which lie above the ex... View full abstract»

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  • Electrical test results of UHV airgaps and insulator configurations

    Publication Year: 1986 , Page(s): 493 - 500
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (835 KB)  

    The paper summarises BPA's (Bonneville Power Administration) 60 Hz and impulse test results on UHV airgaps and insulator configurations performed to evaluate the insulation requirements for 1100 kV transmission lines. Information is presented on the effects of switching impulse waveshape and polarity, the number and type of insulators, grading devices and tower configurations, weather conditions, ... View full abstract»

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  • Design and operation perspective of a British UHV laboratory

    Publication Year: 1986 , Page(s): 501 - 522
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (4017 KB)  

    The authors have, in the past, been directly involved in the design, planning and supervision of the construction, of a new ultra-high-voltage laboratory. The main purpose of the laboratory was to provide a major facility in the UK for the development of switchgear rated up to 765 kV and in the dielectric research required for such an undertaking. Following the opening of the laboratory in 1970, t... View full abstract»

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  • Measuring properties of IREQ's 5.4 MV voltage divider

    Publication Year: 1986 , Page(s): 523 - 533
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1245 KB)  

    The paper presents the results of an investigation into the response characteristics of the Institut de recherche d'Hydro Qu¿¿ebec's 5.4 MV voltage divider, which is suspended from the ceiling of the laboratory. The results obtained differ from those obtained by the Les Renardi¿¿res Group for their floor standing voltage divider. The properties of the divider with three different load geometries w... View full abstract»

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  • Switching-impulse strength of the external insulation of three-phase power transformers

    Publication Year: 1986 , Page(s): 534 - 542
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (765 KB)  

    The switching-impulse strength phase-to-phase and phase-to-earth has been investigated on a power transformer dummy to provide data for the design of its external clearances. The dummy was equipped with 420 kV bushings, but also simulations were used to obtain smaller or larger distances to earth. The clearances were varied between 2 m and 6 m. The influence of rain is included. The report offers ... View full abstract»

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  • Generalised characteristics for the electric strength of phase-to-phase insulation in EHV overhead transmission lines and substations

    Publication Year: 1986 , Page(s): 543 - 546
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (361 KB)  

    The electric strength characteristics of a multi-electrode insulation system can be defined by considering those of a grounded neighbouring electrode (or grounded neighbouring electrodes in a three-phase system). A form for generalising the characteristics is given, and it is hoped that this will simplify both the execution of experimental investigations and the selection of necessary dimensions f... View full abstract»

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  • Statistical design of large UHV electrodes in air

    Publication Year: 1986 , Page(s): 547 - 551
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (690 KB)  

    The large electrodes of UHV testing equipment are usually designed on the basis of the optimisation of their electric fields. But it is necessary to consider the inception of the streamer and leader discharges. The paper deals with basic models of the statistics of the streamer and leader inception. Examples for the design of UHV electrodes are given. View full abstract»

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  • Breakdown characteristics of insulator strings stressed by short tail waves

    Publication Year: 1986 , Page(s): 552 - 561
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (799 KB)  

    Traditionally, the withstand voltage of an insulator string to lightning impacts is checked using the standard impulse 1.2/50 ¿¿s. First, the authors show that when a lightning stroke hits the tower or a ground wire, the resulting overvoltages are characterised by much shorter tail durations than the tail of incident lightning currents. The analysis of wave shapes, in particular tail durations of ... View full abstract»

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  • Corona, breakdown and humidity in the rod-plane gap

    Publication Year: 1986 , Page(s): 562 - 568
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (719 KB)  

    A survey is given of our knowledge of the effects of humidity on corona and breakdown when a positive impulse is applied to a rod-plane gap. It is shown that the minimum in the humidity correction factor Kh which exists, when the impulse wavefront is increased in the range 1 < Tcr < 1000 ¿s, is now substantiated by a number of experimental observations. The potential gradient for streamer p... View full abstract»

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  • Observation of corona phenomena at very high direct voltages

    Publication Year: 1986 , Page(s): 569 - 572
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (316 KB)  

    Corona currents of negative polarity flowing from a variety of earthed electrodes of small radii of curvature have been measured up to direct voltages of 1000 kV. The upper, high-voltage electrode has been either a sphere of 2 m diameter or a plane of 130 cm diameter (with curved edges). Over a current range extending from 0.5 ¿¿A to 2500 ¿¿A the current rises very nearly according to the fairly w... View full abstract»

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  • Evaluation of space-charge behaviour in long airgap using Pockels' cells

    Publication Year: 1986 , Page(s): 573 - 576
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (484 KB)  

    The behaviour of space charge produced by the first corona in a long rod-plane gap under a negative switching impulse voltage was analysed based on the measurements of electric field using Pockels' effect. After examining the reproducibility of the discharge phenomena, the radial and axial electric-field intensities in the gap were measured. The electric-field distribution was obtained based on th... View full abstract»

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