Discharge Process on Long Rod-Rod Electrodes Under Positive Lightning Impulse Voltage

Gürlek, Akif; Shirvani, Ali; Hoshmeh, Abdullah; Schufft, Wolfgang

doi:10.1007/978-3-030-31680-8_82

Cited by 3 publications

(9 citation statements)

References 11 publications

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“…Analogue to the standardised lightning impulse voltage [21], the measured currents at both rod electrodes, as shown in Fig. 3 a consist of two components, which are separated in Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…The curves or the amount of the current

i_{normale}

in Fig. 3 b is comparable to the standardised lightning impulse voltage at the same voltage peak value [21].…”

Section: Measurement Resultsmentioning

confidence: 99%

“…At crest values of the oscillating lightning impulse voltage near the breakdown voltage, not only the phase of the streamer discharge occurs, but also the other phases which were described for the standardised lightning voltage [21]. These are the channel transition and channel formation.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…The capacitive current i c is given by the geometry of the electrode configuration and the applied voltage according: Fig. 3b is comparable to the standardised lightning impulse voltage at the same voltage peak value [21]. However, the waveform of the capacitive current i c differs from the standardised lightning impulse voltage.…”

Section: Voltage and Current Waveformsmentioning

confidence: 92%

“…For this purpose, the currents of discharge should be measured at both rod electrodes simultaneously. In [20, 21], three consecutive phases of the discharge processes have also been identified: streamer discharge, channel transition and channel formation.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Analogue to the standardised lightning impulse voltage [21], the measured currents at both rod electrodes, as shown in Fig. 3 a consist of two components, which are separated in Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…The curves or the amount of the current

i_{normale}

in Fig. 3 b is comparable to the standardised lightning impulse voltage at the same voltage peak value [21].…”

Section: Measurement Resultsmentioning

confidence: 99%

Section: Measurement Resultsmentioning

confidence: 99%

Section: Voltage and Current Waveformsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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

Gürlek

2020

High 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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Experimental Platform for Measuring Electrical Discharges in Long Air Gaps With Floating Objects and Its Applications Under Lightning Impulse

Gao

Wang

et al. 2023

IEEE Sensors J.

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Discharge Process on Long Rod-Rod Electrodes Under Positive Lightning Impulse Voltage

Cited by 3 publications

References 11 publications

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

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

Experimental Platform for Measuring Electrical Discharges in Long Air Gaps With Floating Objects and Its Applications Under Lightning Impulse

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