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

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138 Alexandru Ionuț Chiuță, Liviu Mihai Sima, Nicoleta Doriana Secăreanu4.6.2. CCTV cable (perturbed route): Dispatcher Unirii station –IMGB 1U 40 mV : (Train on starting in Tineretului – Eroii Revolutiei)PRU 50 mV : (Tain on starting in Eroii Revolutiei – Brancoveanu)PRU 60 mV : (Train on starting in Brancoveanu – Eroii Revolutiei)PRU 40 mV : (Train on starting in Brancoveanu – Piata Sudului)PRU 55 mV : (Train on starting in Piata Sudului – Aparatorii Patriei)PRU 30 mV : (Train on starting in Aparatorii Patriei – IMGB 1)PRU 30 mV : (Train on starting in IMGB 1 – Aparatorii Patriei)PRU 50 mV : (Train on starting in Aparatorii Patriei – Piata Sudului)PR4.6.3. CCTV cable (perturbed route): Dispatcher Unirii station –Piaţa SuduluiU 20 mV : (Basic level with no train on starting)PRU 30 mV : (Train on starting in IMGB – Aparatorii Patriei)PRU 20 mV : (Train on starting in Aparatorii Patriei – Piata Sudului)PRU 30...40 mV : (Train on starting in Piata Sudului – Aparatorii Patriei)PRU 25 mV : (Train on starting in Tineretului)PRU 25 mV : (Train on starting in Piata Sudului)PRU 30 mV : (Train on starting in IMGB – Piata Sudului)PRU 35...40 mV : (Train on starting in Tineretului – Unirii)PR4.6.4. CCTV cable (perturbed route): Dispatcher Unirii station –BrancoveanuU 20 mV : (Train on starting in Eroii Revolutiei – Unirii)PRU 20 mV : (Train on starting in Brancoveanu – Unirii)PRU 20 mV : (Train on starting in Unirii – IMGB)PRU 30 mV : (Train on starting in Unirii – Depot)PRU 30 mV : (Train on starting in Tineretului – Unirii)PRCopyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected
Disturbances in The Power Supply Network of Bucharest Subway System 1395. Capacitive unbalance, neutral displacement, influence of CCTV –Subway system5.1. Influence of systemElectric (power) cable lines (ECL), regardless of the treatment of neutral,influence CCTV cables because of the electromagnetic field.Influences depend on the nominal voltage of electric cable lines (20 kV),distances of ECL and CCTV cables.Electromagnetic influences depend on the current value of grounding, treatment ofneutral and homopolar current component (e.g. Harmonics of order 3k = 3, 6, 9,12, ...).Unbalance exists even at normal operating regime on the non-transposed lines.Unbalance current is much smaller than the single-phase short circuit if ECL hasthe neutral grounded.Influences on telecommunications lines have two aspects: the risk of accident anddisturbances.In term of risk of accident – the measures that are expected to avoid the inductionof hazardous voltages in case of short-circuits, are usually sufficient for lowercurrents.In terms of disturbance - the effects of short - circuit currents, that takes very littletime, are not normally taken into account, but only in special cases.For disturbances, the asymmetry currents are important under normal operatingregime or grounding currents regime, when the ECL operates longer undergrounding currents regime.5.2. Neutral displacementAny movement of the neutral results in the appearance of a homopolar voltage.This voltage V is due to existence of a transversal admittance:Y , Y , Y different on the three phases:ABCVVVABC V U V U V UThese admittances are determined by the capacities of phases from the ground.For a fully transposed line, for which capacities from the ground are equal, then:ABCCopyright © 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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Two-dimensional Modelling of Accide
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Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

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