Lightning Protection of Buried Toll Cable

Sunde, Erling

doi:10.1002/j.1538-7305.1945.tb00887.x

Bell System Technical Journal

1945

DOI: 10.1002/j.1538-7305.1945.tb00887.x

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Lightning Protection of Buried Toll Cable

Erling Sunde¹

Abstract: A theoretical study of lightning voltages in buried telephone cable, of the liability of such cable to damage by lightning and of remedial measures, together with the results of simulative surge tests, oscillographic observations of lightning voltages and lightning trouble experience.

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1945

1985

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Cited by 12 publications

References 17 publications

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Induced voltages on buried coaxial cable by direct lightning strokes

Nagano

Member²

1985

Electron. Comm. Jpn. Pt. I

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Large numbers of failures occur in coaxial line repeaters which are located in areas subject to high thunderstorm activity. J. Kemp [3] has calculated the voltage induced in coaxial cables which undergo direct lightning strokes, but it has been found that the failure rate that occurs in actual installations may, in some cases, be as great as 100 times the failure rate calculated by Kemp's method. Transient phenomena are generally calculated by means of transforms using Heaviside's operational method, but in the case of transmission lines, because of the need to employ approximations, very significant errors can be introduced. In particular, many of the buried cables installed in recent years have metallic sheaths which are insulated from the earth and it has become necessary to take this fact into account to arrive at accurate results. Using line constants which take into account the skin effect, the induced voltage is here determined by numerical computation of the inverse Laplace transform and from this the failure rate is computed. The results are in almost perfect agreement with actual conditions. In addition, comparing the results obtained by this method with those obtained by the conventional method, we see that when the metallic sheath is insulated from earth the induced voltage becomes large because the lightning wave flowing into the metallic sheath is not attenuated very much and a high excitation voltage is therefore distributed over a long distance. Since this method permits quite complicated computations, it is expected that its application will facilitate development of suitable lightning protection methods.

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Induced voltages on buried coaxial cable by direct lightning strokes

Nagano

Member²

1985

Electron. Comm. Jpn. Pt. I

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Lightning Current Observations in Buried Cable

Trueblood¹,

Sunde²

1949

Bell System Technical Journal

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Effects of Lightning Punctures on the Core-Shield Voltage of Buried Cable

Ungar¹

1980

Bell System Technical Journal

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A common form of lightning-inducedcable damage occurs when a lightning surge travels down the shield of a cable, inducing large voltages between the cable core and the shield and leading to possible insulation breakdown and arcing. The magnitude of this core-shield voltage is a function of how quickly the lightning current is shunted to the surrounding soil, either through a ground or by puncturing the protective jacket of the cable. Core-shield voltages are calculated for various combinations of cable length, cable diameter, soil conductiv ity, lightning pulse shape, and resistance of the cable jacket to puncturing and compared with results obtained by assuming that the cable jacket is punctured along its entire length. This latter assump tion, the "bare shield" model, has generally been used to predict coreshield voltages. We have found that the "bare shield" model can lead to a significant underestimation of the core-shield voltage, particu larly for small diameter cables with long distances between grounds (on the order of 10 kilometers).We present curves that provide an estimate of the peak core-shield voltage for a cable in which the jacket punctures for a portion of its length.

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Lightning Protection of Buried Toll Cable

Abstract: A theoretical study of lightning voltages in buried telephone cable, of the liability of such cable to damage by lightning and of remedial measures, together with the results of simulative surge tests, oscillographic observations of lightning voltages and lightning trouble experience.

Cited by 12 publications

References 17 publications

Induced voltages on buried coaxial cable by direct lightning strokes

Induced voltages on buried coaxial cable by direct lightning strokes

Lightning Current Observations in Buried Cable

Effects of Lightning Punctures on the Core-Shield Voltage of Buried Cable

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