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Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

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Disturbances in The Power Supply Network of Bucharest Subway System 1252.2. DisturbancesDisturbances may be manifested in the two forms:- common mo<strong>de</strong> interference or longitu<strong>din</strong>al interference, which consists inthe appearance of a harmful energy relative to a common reference, usuallyweight, for both routes of signal or fee<strong>din</strong>g;- simple mo<strong>de</strong> interference or normal or serial interference.Harmful effects can be created by running resistance or mechanical movementsthat produces changes in capacity or by vibration of a current path in the magneticfield or by combined phenomena of electrical corrosion.Line scanning of TVs, if not treated against disturbances, emits interference on15,625 Hz and its harmonics.2.3. InfluencesIn case of electrical installations of subway we have the voltage between 1 - 20kV, on neighbouring wire telecommunication lines (CCTV cable), we have thefollowing influences:a) ELECTRIC INFLUENCE - effect of electric component of power line electricfield (LE);b) MAGNETIC INFLUENCE - effect of magnetic component of power lineelectric field;c) RESISTIV COUPLING - effect of current passage through the ground ofelectrical installations.Following the measurements and their processing it is <strong>de</strong>termined the allowablelimits and calculation conditions, as well as it is indicated the specific measures toreduce the effects of influences - for the protection of people, facilities andbroadcasting against hazardous and harmful effects of these influences.The works of protection against dangerous influences will be executed beforeputting into operation of the installations that make them necessary.3. Closed circuit television (CCTV)3.1. IntroductionEquipment of closed circuit television (CCTV) of Line II, sections 1 and 2. This isbased on a draft prepared by the projection <strong>de</strong>partment of subway. It is usedCCTV equipment on higher standards.Based on the project, the CCTV installation consists in fig. 1. We have:Copyright © Editura Aca<strong>de</strong>miei <strong>Oamenilor</strong> <strong>de</strong> Știință <strong>din</strong> România, <strong>2011</strong>Watermark Protected

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