A transient model of lightning breakdown process based on photographic measurements

Shirvani, Ali; Malekian, Kaveh; Schufft, Wolfgang

doi:10.1109/eic.2013.6554210

Cited by 5 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, it was shown that the pre-discharge current can be calculated through the measured voltage and evaluated streamer and leader lengths. Even more, it is possible to compute the electrical field of a configuration in its temporal and spatial dependence through optical evaluation of the generated space charges, illustrated in Figure 8 [27]. In summary, the findings have shown that the sub-processes streamer and leader are present in all voltage forms, even in LI.…”

Section: Recent Dedicated Groundworkmentioning

confidence: 83%

“…In this regard, the authors postulate that the configuration factor C C can be ascertained via already known factors and functions (like gap factor K, factor G 0 , the Schwaiger factor η, etc. ), yet also via the calculation models of [27] (confer Appendix B.6).…”

Section: Hypothetical Atmospheric Correction Methods Based On Physicalmentioning

confidence: 99%

“…However, for the illustrated correction method of the paper at hand, a general gradient independence is assumed. Should the investigations refute this assumption, the necessary gradient correction functions shall either be determined by the evaluation of separate gradient correction functions in analogy to C S (X) and C L (X), or through usage of the calculation models of [27].…”

Section: Hypothetical Atmospheric Correction Methods Based On Physicalmentioning

confidence: 99%

“…The key premise of the proposed research is the following hypothesis, based upon the findings of [3,[25][26][27] (respectively [24]): in the determination of breakdown and withstand voltages, the influences of atmosphere can be decoupled from the influences of voltage form and configuration through a sub-process differentiated evaluation of the entire breakdown process, thereby quantifying these influences on streamer and leader separately. The proposed future investigations can then roughly be divided into the following three major steps:…”

Section: Research Proposal Outlinementioning

confidence: 99%

“…Recent related groundwork of the authors mainly refers to the sub-process differentiated evaluation of breakdown processes in small and large air-gaps with lightning impulse (LI) voltage at standard atmospheric conditions (in context of the PhD thesis [24], respectively [3,[25][26][27]). This includes the development of a joint measurement system, which allows the synchronous measurement of electrical time signals (voltage and pre-discharge current) and optical signals, the latter being the photographic captured propagation of streamer and leader through a high-speed camera [25,26].…”

Section: Recent Dedicated Groundworkmentioning

confidence: 99%

See 4 more Smart Citations

Proposal for a General Atmospheric Correction Method of Breakdown and Withstand Voltages of Air-Gap Insulated Configurations Based on a Streamer–Leader Differentiated Model of the Breakdown Process

Schubert¹,

Shirvani²,

Schmidt

et al. 2018

Energies

Self Cite

View full text Add to dashboard Cite

Current atmospheric correction methods for breakdown and withstand voltages in long air-gap configurations show deviations in comparison to measurement data when applied to correct for unusual or atypical atmospheric conditions (i.e., altitudes above 2000 m a.s.l.). The corresponding standards IEC 60060 and IEC 60071 show inconsistencies, although both are being based upon the same measurements and empirical models. In its first part, the concept paper at hand presents the current knowledge and problems of atmospheric correction. In the second part, the authors outline the possible steps for a necessary new investigation as well as the algorithm of a hypothetical correction method. The proposed research is based upon the recent knowledge that any breakdown process in air-gap insulation consists of the sub-processes streamer and leader. While their characteristics seem to be independent of configuration and voltage form, their ratio and proportion varies, which, in turn, defines the value of breakdown voltage. Therefore, the authors propose a sub-process differentiated, measurement-based evaluation of the atmospheric influences air pressure, air humidity, air conductivity and temperature. The main goal is to develop a generic physical model of the breakdown process.

show abstract

Section: Recent Dedicated Groundworkmentioning

confidence: 83%

Section: Hypothetical Atmospheric Correction Methods Based On Physicalmentioning

confidence: 99%

Section: Hypothetical Atmospheric Correction Methods Based On Physicalmentioning

confidence: 99%

Section: Research Proposal Outlinementioning

confidence: 99%

Section: Recent Dedicated Groundworkmentioning

confidence: 99%

See 3 more Smart Citations

Proposal for a General Atmospheric Correction Method of Breakdown and Withstand Voltages of Air-Gap Insulated Configurations Based on a Streamer–Leader Differentiated Model of the Breakdown Process

Schubert¹,

Shirvani²,

Schmidt

et al. 2018

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

Breakdown process on rod–rod air gap under oscillating lightning impulse voltage

Gürlek

2020

High Voltage

View full text Add to dashboard Cite

This study presents the discharge process on rod-rod electrodes under oscillating lightning impulse voltage. For this purpose, a measurement system has been developed to record the discharge currents at both rod electrodes simultaneously and to photograph the spatial propagation of the discharges. The measurement results of the discharge process are shown for an air gap of s = 150 cm and for a superimposed frequency of f = 200 kHz. Like the standardised lightning impulse voltage, three consecutive phases of discharge have been identified before a breakdown occurs. These are streamer discharge phase, channel transition phase and channel formation phase. The three phases are described, interpreted and their correlation is shown. On the basis of the oscillations, the discharge processes recur periodically if the momentary voltage is higher than the mean curve of the oscillating lightning impulse voltage. The streamer discharge emerges foremost at the positive rod electrode and propagates toward the grounded rod electrode. Its propagation depends on the voltage crest value. Arriving at the grounded rod electrode, the channel transition phase begins. There the discharge moves back to the positive rod electrode due to recombination and generation. Then the discharge constricts to the positive rod electrode, which forms a channel. Simultaneously, at the grounded rod electrode, a channel is also emerging. In each period, the channel will build up stepwise. The channel leads to the main discharge of the oscillating lightning impulse voltage.

show abstract

Stochastic character modelling of breakdown under lightning impulse voltage

Gürlek

Malekian

Schufft

2016

2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

View full text Add to dashboard Cite

A transient model of lightning breakdown process based on photographic measurements

Cited by 5 publications

References 6 publications

Proposal for a General Atmospheric Correction Method of Breakdown and Withstand Voltages of Air-Gap Insulated Configurations Based on a Streamer–Leader Differentiated Model of the Breakdown Process

Proposal for a General Atmospheric Correction Method of Breakdown and Withstand Voltages of Air-Gap Insulated Configurations Based on a Streamer–Leader Differentiated Model of the Breakdown Process

Breakdown process on rod–rod air gap under oscillating lightning impulse voltage

Stochastic character modelling of breakdown under lightning impulse voltage

Contact Info

Product

Resources

About