Experimental Study of Multiple-Reignition Features of Secondary Arcs on EHV/UHV Transmission Lines

When a single-phase-to-ground fault occurs in a power system, a secondary arc will normally be generated at the fault position after the fault phase has been interrupted. A detailed investigation of multiple-reignition features of secondary arcs on extra-high-voltage/ultra-high-voltage transmission...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 66; no. 4; pp. 3247 - 3255
Main Authors Liu, Hongshun, Li, Runchang, He, Dongxin, Wei, Jianchun, Li, Qingquan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Biological evolution
Circuit breakers
Circuit faults
Discharge
Discharges (electric)
Electric arcs
Electric potential
Extinction mechanism
High voltages
Ignition
Insulators
Magnetic compression
multiple-reignition feature
Numerical models
Power transmission lines
secondary arc
Short-circuit currents
single-phase-to-ground fault
Transmission lines
Volt-ampere characteristics
volt–ampere characteristic
Waveforms
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Summary:When a single-phase-to-ground fault occurs in a power system, a secondary arc will normally be generated at the fault position after the fault phase has been interrupted. A detailed investigation of multiple-reignition features of secondary arcs on extra-high-voltage/ultra-high-voltage transmission lines is, therefore, very important. In this paper, an experimental setup for generating a secondary arc across a transmission-line insulator string is presented, and both the discharge waveforms and images are synchronously recorded. According to the properties of the discharge waveforms, the discharge process is divided into two stages and each stage is analyzed. The evolution of the volt-ampere characteristic and the resistance-current curve of the secondary arc is found to exhibit hysteresis during the discharge process. Multiple-reignition images of the secondary arcs are converted into binary images using image threshold processing. The arc length and breakdown voltage are discussed in association with the discharge images. Morphological changes in the secondary arc during a single discharge process are analyzed in terms of self-magnetic compression theory, and the extinction mechanism of the arc discharge is discussed on the basis of two theoretical approaches.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2844782