Accumulative effect of partial discharges at impulse voltage wave tail

Florkowski, Marek

doi:10.1049/iet-smt.2019.0310

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…Actually, in addition to the effects of DC and AC voltage on the insulation, power equipment can be affected by impulse voltage for switching and lightning. Researchers have studied the PD behaviours under the impulse voltage alone [16][17][18]. However, with the stress of switching or lightning impulse, the voltage applied on the equipment can be the superposition of impulse and DC/AC.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge measurement and analysis under lightning impulse superimposed DC voltage in SF6 gas

Wang

Guo

et al. 2021

High Voltage

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The presence of lightning impulses (LIs) on the DC waveform can seriously influence the insulation performance of a GIL system. The waveshape can be a superposition of the DC and impulse waveform. In this study, the behaviour of partial discharge (PD) on an epoxy surface is investigated under DC and LI superimposed voltage in SF 6 . The lightning impulses with different polarities are superimposed on the epoxy surface under both positive and negative DC voltages, respectively. Positive lightning impulses are superimposed on a negative DC voltage with a 90% of the partial discharge inception voltage (PDIV) magnitude. The number and amplitude of the PDs are used to evaluate the insulation performance. The experimental results show that the LI with a different polarity applied to DC can excite the PDs on the epoxy surface. The excitation effect of positive LI superimposed on negative DC is more significant. According to the impulse amplitude and PD characteristics, the influence of superimposed LI on PD excitation can be divided into three stages. As the superimposed LI increases, the amplitude of the excited PD increases gradually, while the PD number first increases and then decreases. This study is expected to provide reference for manufacture and protection of power equipment.

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Section: Introductionmentioning

confidence: 99%

Partial discharge measurement and analysis under lightning impulse superimposed DC voltage in SF6 gas

Wang

Guo

et al. 2021

High Voltage

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“…The BD occurrence during this multiple times lightning impulses has been reported. The cumulative effect of repeated impulses is considered to greatly affect insulation materials and electrical equipment, and it leads to degradation or even premature failure [2,[12][13][14]. Although the mechanism has not been clear until now, one of the cumulative effects is the thought to be driven by the residual space charge.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge observation of a complex insulation structure model and residual space charge characteristics investigation under repeated lightning impulses

Ichimura

Rokunohe

2021

IET Science Measure & Tech

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In this research, the authors concentrated on a rarely studied part in the power transformer's insulation structure: the connection part of radial and axial spacers. An experimental model was constructed to simulate this part. It was experimentally observed that the partial discharge starting in the oil gap created by the axial and radial spacers. Characteristics of the abovementioned partial discharge under repeated lightning impulses were also investigated. A longer interval time seemed to accelerate the insulation property deterioration of the constructed model, which is contrary to those reported in other studies. It was because that the partial discharge occurrence was prevented by the residual space charge at the surface of oil/insulation if the time interval of the repeated impulses was not long enough. Therefore, it is proposed that a long enough interval time or a polarity test is expected in the factory test to exclude the influence of the residual space charge and understand the real insulation property of power transformers.

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“…Xuanrui Zhang et al, in his recent work with oscillating impulses, highlighted the prospects of the frequency domain analysis of the test results, in detecting the partial discharges within transformer insulation [20]. Marek Florkowski has recently discussed the effect of impulse voltage parameters such as front time, tail times and peak voltage, on the PD attributes [21]. More experimental works are needed to understand the loading effects of the sources of PDs thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Extended Application for the Impulse-Based Frequency Response Analysis: Preliminary Diagnosis of Partial Discharges in Transformer

2020

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Accumulative effect of partial discharges at impulse voltage wave tail

Cited by 7 publications

References 40 publications

Partial discharge measurement and analysis under lightning impulse superimposed DC voltage in SF6 gas

Partial discharge measurement and analysis under lightning impulse superimposed DC voltage in SF6 gas

Partial discharge observation of a complex insulation structure model and residual space charge characteristics investigation under repeated lightning impulses

Extended Application for the Impulse-Based Frequency Response Analysis: Preliminary Diagnosis of Partial Discharges in Transformer

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