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

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124 Alexandru Ionuț Chiuță, Liviu Mihai Sima, Nicoleta Doriana Secăreanu2. General electromagnetic compatibility2.1. DefinitionsELECTROMAGNETIC COMPATIBILITY is the condition in which the level ofimmunity to disturbances of any device on the system is higher than the level ofdisturbances to which the device is subjected in the system. Concept ofelectromagnetic compatibility refers to the system in which the device is used (TVmonitor, TV room, TV cable), a device having the ability to be compatible in onesystem but not necessarily in another.COMPATIBILITY LEVEL is the level of disturbance, less than or equal to theimmunity of any undisturbed device in the system but equal to or greater than thedisturbance level generated by the system disrupters.NOMINAL COMPATIBILITY LEVEL is the estimated one under nominalconditions, with acceptable variations, e.g.: frequency, voltage and load.CRITICAL LEVEL OF COMPATIBILITY is the level of the best advantageousconditions. It should be considered in emergency or rare events, in which case theprotection and safety measures should be taken and enforced to prevent: humancasualties, scraping, interruption of work and damage to equipment.ELECTRIC IMMUNITY LEVEL of a device is defined as the maximum amountof disturbance that can be applied to, without losing its performance. The degreesof severity are:- functional immunity level;- failure immunity level;- damage immunity level.COMPATIBILITY MARGIN is defined as:- difference in decibels between the level of immunity to disturbance of thedevice or system and level of disturbance to which it is subjected. Compatibility isthe case of system or subsystem in which the margin in dB is positive;- ratio between the level of immunity to disturbance of the device or systemand level of disturbance to which it is subjected. Compatibility is the case ofsystem or subsystem in which the ratio is bigger than 1.INTERFERENCE lies in the effects due to disturbances, incompatible withachieving the performances required.SUSCEPTIBILITY is the capacity of a device, apparatus or system with thatresponds to the unwanted energy of disturbances.Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected
Disturbances in The Power Supply Network of Bucharest Subway System 1252.2. DisturbancesDisturbances may be manifested in the two forms:- common mode interference or longitudinal interference, which consists inthe appearance of a harmful energy relative to a common reference, usuallyweight, for both routes of signal or feeding;- simple mode 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 determined 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 department of subway. It is usedCCTV equipment on higher standards.Based on the project, the CCTV installation consists in fig. 1. We have:Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected
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3FOREWORDBased on a rich scientific
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Annals of the Academy of Romanian S
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The remanufacturing of an articulat
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Influence of Vibrations and Dynamic
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Products recovery opportunities at
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Products recovery opportunities at
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Recycling and Remanufacturing -Two
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Recycling and Remanufacturing -Two
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The Study of Heavy Metal from Envir
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mg/kg d.wThe Study of Heavy Metal f
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ConclusionsThe Study of Heavy Metal
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Analytical Evaluation of Crack Prop
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Y d Notations:Analytical Evaluation
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General Considerations Regardingthe
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Intelligent Networks, Smart Grids C
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Intelligent Networks, Smart Grids C
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Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

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