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Discussion on ``Protection of Cables from Arcs Due to Failure of Adjacent Cables''

1904; Institute of Electrical and Electronics Engineers; Volume: XXIII; Linguagem: Inglês

10.1109/t-aiee.1904.4764473

2330-9431

Ralph D. Mershon,

Electrical Fault Detection and Protection

RALPH D. MERSHON: In addition to the protection of cables in manholes, there is also the question of the protection of cables in power-stations.It is not always easy to install cables in such a way that they will be protected from each other, es- pecially if the power-house has not been laid out with reference to them.The question of protecting cables bymeans of asbestos and similar wrappings has for its chief objection that there is no chiance to get rid of the heat in the cable.For that reason, and for the greater one of reliability, the speaker very much prefers either tile or brick protection to asbestos.Mr. Carlton speaks of using a voltmeter for determining the current being carried by the cable sheath.Will Mr. Carlton please explain a little, more fully the method of using the volt- meter, and also the method he prefers for permanent grounding of metal sheaths?W. F. WELLS: Mr. Carlton refers to two independent lines of subway as being an insurance against trouble on a Ilngh-pressure cable system.In New York this practice lhas been carried a little further, and four separate and inde- pendent trunk subways lhave been installed, leading from the generating station along four different routes.From these trunk subways run brancdes arranged so as to give each sub- station two or more feeders, following entirely different subway routes.In case of a manhole caving in, or general trouble on any subway line, not more than one quarter of the high-pressure cable system can be affected.