Spatial-temporal investigation of breakdown of long air gaps by lightning voltages up to 2.4 MV

Shirvani, Ali; Schufft, Wolfgang; Pampel, Hans-Peter; Schmidt, Uwe

doi:10.1109/eic.2013.6554265

Cited by 10 publications

(14 citation statements)

References 7 publications

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“…The physical characteristics of streamer and leader seem to be independent of voltage form and configuration and exhibit no significant variance at standard atmospheric conditions. Therefore, the authors propose a sub-process-differentiated, measurement-based evaluation of the atmospheric influences on streamer and leader, employing the measurement system and models introduced in [25,26]. As a key element, it is hypothesized that the influences of the atmospheric conditions can be decoupled from the influences of voltage form and configuration.…”

Section: Discussionmentioning

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%

“…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]. The principle block diagram of that measurement system is depicted in Figure 5.…”

Section: Recent Dedicated Groundworkmentioning

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%

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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

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Research Proposal Outlinementioning

confidence: 99%

Section: Recent Dedicated Groundworkmentioning

confidence: 99%

Section: Recent Dedicated Groundworkmentioning

confidence: 99%

See 2 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

“…Through the development of the measurement technique, the discharge process under standardised lightning impulse voltage can be precisely recorded [12][13][14][15][16]. In [12], a measurement system was developed for a rod-plane electrode configuration, which is also able to record the discharge current from milliampere to ampere in the nanosecond range.…”

Section: Introductionmentioning

confidence: 99%

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

Gürlek

2020

High Voltage

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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.

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Modelling of dielectric strength in long air gaps: application to a complex geometry

Konate¹,

Béroual²,

Maciela³

2020

J. Phys. D: Appl. Phys.

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This paper presents new contributions to the study of the positive discharge in large air gaps. A model enabling us to determine the voltage U50 and the kfactor in nonstandard geometry using the circuit model developed by Beroual's group for long positive and negative discharges is presented. This model is based on an equivalent circuit diagram, the parameters of which vary with time according to the leader channel characteristics and the geometry/ morphology of the discharge. The propagation of the leader is based on a criterion related to the calculation of the electric field at its head and that takes into account the randomness of the discharge path. As with most of models found in the literature, this model applies only to the pointplane type electrodes gap. This paper consists of two parts: (1) the first part, presents how to extend the proposed model to complex geometries such as rod-rod electrode gaps; and (2) the second part presents the experimental tests we achieved for rodplane and rod-rod geometries. The experimental results especially the values of U50 and kfactor are compared with the simulated ones deduced from our model, for two types of voltage waveforms: the lightning impulse shape and the switching impulse shape (precisely, the critical impulse shape).

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Spatial-temporal investigation of breakdown of long air gaps by lightning voltages up to 2.4 MV

Cited by 10 publications

References 7 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

Modelling of dielectric strength in long air gaps: application to a complex geometry

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