The Penetration of Electromagnetic Radiation Into Ferromagnetic Material [includes discussion]

Adams, Comfort A.

doi:10.1109/aieepas.1956.4499329

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The interesting feature is that the pipe impedance is always much less than its de resistance, being approximately only one third to one half of the dc value. The tests figures are considerably lower than the calculated values by Adams' method [2] as shown in Table III. System fault current taken as 10 kA rms (pipe impedance based on 9 kA).…”

Section: Resultsmentioning

confidence: 62%

“…(1) The longitudinal voltage induced between the conductor and the sheath in an auxiliary cable is equal to the resistive voltage drop of the sheath current. Thus, by the definition of the screening and coupling factors Is X Rs = krXmI.o (2) Therefore, the resultant screening factor of the auxiliary cable concerned is kr= IRs/IoXm.…”

Section: Appendixmentioning

confidence: 98%

“…The effect of one conductor-to-ground was substantially the same as three conductors in parallel inside the pipe. Adams [2] first developed a theory for approximating the steel pipe impedance-to-ground due to fault current in the cable systems, neglecting the internal shunit return path. The pipe internal resistance was given as a function of the pipe diameter, frequency, and inducing current flowing inside the pipe.…”

Section: Zero Sequence Impedance Of Steel Pipe-historical Surveymentioning

confidence: 99%

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Screening Factor of Pipe-Type Cable Systems

Chu¹

1969

IEEE Trans. Power Appar. Syst.

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After reviewing the background of zero sequence impedance of pipe-type cables, the paper describes in general the longitudinal voltages induced in adjacent auxiliary cables due to a fault in power transmission systems. The magnitude of the induced voltage is influenced by the screening effect of the power cables. The screening factor and the impedance of the steel pipe have been measured in the laboratory by short-circuit tests on a 275-kV cable sample with a simulated ground return path. The results are used to illustrate the application in induced voltage calculations in a typical example.It is shown that, owing to the very low impedance of the steel pipe, it gives a very low screening factor, i.e., low longitudinal induced voltages in neighboring auxiliary cables. Hence an economical design of auxiliary cables may be used.