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Your search keyword '"Shahrtash, S. Mohammad"' showing total 4 results
Start Over Author "Shahrtash, S. Mohammad" Topic partial discharge
4 results on '"Shahrtash, S. Mohammad"'

1. On-line partial discharge defected phase selection and localization in cross-bonded single core cables.

Author

Babaee, Abbas and Shahrtash, S. Mohammad

Subjects
*PARTIAL discharges, *POINT defects, *ELECTRIC cables, *SEMICONDUCTOR junctions, *ELECTROMAGNETIC shielding
Abstract

In this paper, a practical rule-based guideline has been presented for on-line detection of partial discharge (PD) defected phase (i.e., phase selection) followed by discriminating PD defected cable section (i.e., localization) in cross-bonded single core cable networks. Both goals are met by relying on the proposed rules that take the advantages of an energy-based index, calculated/measured at different junctions of cable network. The whole process provides practicability needs, as it requires neither synchronized measurements at different junctions of a network nor any PD pulse detection. Moreover, the proposed procedure derives the required indices from the measurements out of the link boxes, which provides enough safety in practical applications. Simulating and investigating four popular cross-bonding schemes (including sectionalized and continuous by coaxial cable and single core cable) as well as various characteristics of PD sources, different source locations, and noisy condition have proven acceptable performance of the proposed method in both tasks of phase selection and localization. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Evaluation of shielded Rogowski coil for measuring partial discharge signals.

Author

Hemmati, Esmaeil and Shahrtash, S. Mohammad

Abstract

In this paper, the performance of constructed shielded Rogowski coil for measuring partial discharge signals is investigated under different conditions of terminating impedance and the deviation of current carrying conductor (CCC) from central position. The studies are made in both frequency and time domain. Also the Rogowski coil model is brought and its verification is done. [ABSTRACT FROM PUBLISHER]

Published
2012
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3. Evaluation of unshielded Rogowski coil for measuring partial discharge signals.

Author

Hemmati, Esmaeil and Shahrtash, S. Mohammad

Abstract

Due to low magnitude of partial discharge signals, special instruments are needed for measuring these signals. Traditional instruments for measuring partial discharge signals, in electrical cables, are capacitive sensors and High frequency Current transformers. Recently using Rogowski coil for measuring partial discharge signals have attracted more attention. In this paper Rogowski coil performance in wide frequency range, between 1 kHz up to 12 MHz, is investigated. As shielding has significant effect on Rogowski coil performance, here Rogowski coil performance without existence of shielding is investigated. The effect of different parameters, such as terminating impedances and deviation of current carrying conductor from central position, is investigated on Rogowski coil performance not only in frequency domain but also in time domain. Also the model of Rogowski coil is presented and its verification is studied. [ABSTRACT FROM PUBLISHER]

Published
2012
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4. Comprehensive 3-capacitors model for partial discharge in power cables.

Author

Haghjoo, Farhad, Khanahmadloo, Esmaeel, and Shahrtash, S. Mohammad

Subjects
ELECTRIC cables, ELECTRIC circuits, INTEGRATED circuits, REDUCED instruction set computers, ELECTRONIC circuits, MICROELECTRONICS
Abstract

Purpose |!|#8211; The paper proposes and presents a comprehensive and integrated circuit model for investigating the behaviour of partial discharges occurring in voids inside the solid insulations of medium and high voltage cables. Design/methodology/approach |!|#8211; The model is based on the well-known three capacitors model, which is remarkably improved to handle physical parameters such as cavity size, position, shape and pressure, environmental parameters such as cable temperature, in addition to operational parameters such as the contributions of the avalanche of free electrons inside the cavity through considering stochastic time delays. Findings |!|#8211; A complete, flexible and reliable model for partial discharges in voids inside the solid insulation of medium and high voltage cables is presented whose output agrees with experimental reported results. Research limitations/implications |!|#8211; The proposed model deals only with single voids, and the semiconductor layers in the insulation of cables are not considered. Practical implications |!|#8211; The model can be used in different physical, environmental and operational conditions in order to investigate the characteristics of partial discharge signals to be used as the bases for partial discharge detection and classification in power cables. Originality/value |!|#8211; This paper presents a novel comprehensive and integrated circuit model with controlling functions to propose the behaviour of partial discharge occurring in voids inside the solid insulation of power cables. The model provides the contribution of geometrical parameters of the void, and operational conditions such as cable temperature and source frequency in partial discharge analysis. [ABSTRACT FROM AUTHOR]

Published
2012
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