Measurements on screened twin cable with an earthed measuring instrument
作者:
A.S.Gladwin,
期刊:
Proceedings of the IEE - Part II: Power Engineering
(IET Available online 1951)
卷期:
Volume 98,
issue 64
页码: 547-556
年代: 1951
DOI:10.1049/pi-2.1951.0149
出版商: IEE
数据来源: IET
摘要:
Various methods of connecting a screened twin cable and an earthed measuring instrument are examined. It is shown that the cable characteristics can be most easily and accurately measured when the connections are such as to produce a nearly symmetrical potential distribution in the cable. In this condition, the impedance measured depends almost entirely upon the constants of the twin system and is only slightly influenced by the earthed system formed by the inner conductors and the screen.Capacitance, attenuation and phase unbalance are discussed. It is shown that a method in which connections are made to both ends of the cable is particularly useful with unbalanced cables, for it automatically takes the average of the two readings which would otherwise be required.
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