Simulation, Generation and Measurement of Oscillated Lightning Impulse Voltage

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

doi:10.1007/978-3-030-31680-8_83

Cited by 1 publication

(1 citation statement)

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“…This paper presents the further development of the measurement system in [19] to investigate the discharge behaviour under a non‐standardised lightning impulse voltage. Therefore, the Marx generator has been modified to generate a standardised lightning impulse voltage with superimposed oscillations [34, 35]. In the following section, the extended measurement system will briefly be described.…”

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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Section: Introductionmentioning

confidence: 99%