Air insulation at large spacings

The nature of recent international research collaboration is described. Breakdown data obtained on a wide variety of air clearances are comprehensively summarised; the effects of the polarity and shape of the testing impulse, the geometry of the electrodes and the condition of the atmosphere are considered separately. Recent improvements in the physical understanding of the pre-breakdown phenomena are discussed in some detail, and their application to engineering problems, by means of models, is considered. Newly developed methods of field calculation are applied to complex configurations subjected to more than one voltage stress. Statistical methods are used, both in assigning confidence intervals to test data, and in predicting risks of failure.

[1]  T. Suzuki,et al.  Breakdown process of long air gaps with positive switching impulses , 1975, IEEE Transactions on Power Apparatus and Systems.

[2]  J. E. Matthews,et al.  Prebreakdown phenomena in standard rod gaps subjected to impulse voltages , 1971 .

[3]  J. H. Park,et al.  Surge voltage breakdown of air in a nonuniform field , 1956 .

[4]  G. Carrara,et al.  A Statistical Aspect of the Coordination of Two Gaps , 1965 .

[5]  J. M. Meek,et al.  The development of the spark discharge , 1938 .

[6]  L. E. Zaffanella,et al.  Switching Surge Flashover of UHV Transmission Line Insulation , 1971 .

[7]  M. M. Kekez,et al.  CORRIGENDA: A hypersonic interpretation of the development of the spark channel in gases , 1974 .

[8]  C. Menemenlis,et al.  Coefficient of Variation of the Positive-Impulse Breakdown of Long Air-Gaps , 1974 .

[9]  G. A. Dawson,et al.  A model for streamer propagation , 1965 .

[10]  G. Carrara,et al.  Switching Surges with Very Long Fronts (above 1500 μs): Effect of Front Shape on Discharge Voltage , 1970 .

[11]  W. J. Roberts,et al.  Switching-impulse flashover of air gaps and insulators in an artificially polluted atmosphere , 1968 .

[12]  I. Gallimberti.  A computer model for streamer propagation , 1972 .

[13]  T. Udo.  Switching Surge and Impulse Sparkover Characteristics of Large Gap Spacings and Long Insulator Strings , 1965 .

[14]  John Samuel Forrest,et al.  A Discussion on recent advances in heavy electrical plant - Switching surges and air insulation , 1973, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[15]  J. Dutton,et al.  A survey of electron swarm data , 1975 .

[16]  J. K. Wright.  A contribution to the theory of impulse corona and the long spark , 1964, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[17]  C. T. Phelps.  Positive streamer system intensification and its possible role in lightning initiation , 1974 .

[18]  Tatsuya Harada,et al.  Influence of Air Density on Flashover Voltages of Air Gaps and Insulators , 1970 .

[19]  T. E. Allibone,et al.  Variation of ion density in a high-voltage laboratory during impulse-voltage testing , 1974 .

[20]  R C Klewe,et al.  Impulse breakdown of large sphere-plane gaps , 1972 .

[21]  O. Tassicker.  Boundary probe for measurement of current density and electric-field strength - with special reference to ionised gases , 1974 .

[23]  G. Carrara,et al.  Switching surge strength of large air gaps: A physical approach , 1976, IEEE Transactions on Power Apparatus and Systems.

[24]  J. M. Meek,et al.  The initiation mechanism of long sparks in point-plane gaps , 1955 .

[25]  C. Menemenlis.  Growth of Positive Channels in Non-uniform Fields during Impulse Breakdown , 1962, Nature.

[27]  G. Petropoulos.  Constriction of a spark discharge during impulse breakdown , 1964 .

[28]  J. H. Pickles,et al.  Monte Carlo field calculations , 1977 .

[29]  David J. Rose,et al.  Basic Processes of Gaseous Electronics , 1956 .

[30]  J. Kritzinger.  Impulse Corona and the Pre-Breakdown Mechanism of Long Sparks , 1963, Nature.

[31]  Luigi Paris.  Influence of Air Gap Characteristics on Line-to-Ground Switching Surge Strength , 1967 .

[32]  W. G. Standring,et al.  Breakdown under impulse voltages of solid and liquid dielectrics in combination , 1956 .

[33]  J. M. Meek.  The vital spark , 1968 .

[34]  T. E. Allibone,et al.  The development of the spark discharge. II , 1938 .

[35]  B. F. Hampton,et al.  Flashover mechanism of polluted insulation , 1964 .

[36]  J D Craggs,et al.  High voltage laboratory technique , 1954 .

[37]  Berthold E. Ganger,et al.  Studies of Spark Formation at High Switching Voltages of Positive Polarity , 1972 .

[38]  H. C. Barnes,et al.  UHV Transmission Design Requirements - Switching Surge Flashover Characteristics of Extra Long Air Gaps , 1971 .