Breakdown under impulse voltages of solid and liquid dielectrics in combination

Standring, W.G.; Hughes, R. C.

doi:10.1049/pi-a.1956.0143

Cited by 23 publications

(4 citation statements)

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“…where L is the number of surges required to initiate a tree; V is the surge voltage in kV; and R is the number of surges applied to the insulation per second. Equations (1) and 2, respectively, relate to positive and negative surges. Guastavino et al [40] pointed out that the lifetime of the dielectric is directly related to the frequency and amplitude of the impulse voltage and temperature.…”

Section: Factors Affecting the Failure Characteristics Of Turn-toturnmentioning

confidence: 99%

“…In 1956, the concept of the accumulative effect was first proposed for use in electrical engineering research by Standring. He studied the breakdown characteristics of synthetic resin‐bonded paper sheets and found that the solid dielectric broke down under application of repetitive impulse voltages, despite the amplitude of the applied impulse voltage is much lower than that of the breakdown voltage of the dielectric [1]. In the following decades, the accumulative effect of repetitive impulse voltages on insulation did not draw much attention until the 1990s, when researchers found that premature failure may occur when the winding insulation of inverter‐fed motors was subjected to repetitive impulse voltages caused by pulse‐width modulation (PWM)‐type inverters.…”

Section: Introductionmentioning

confidence: 99%

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Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

et al. 2019

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The premature failure phenomenon that occurs in solid insulation under the application of repetitive impulse voltages is known as the accumulative effect of impulse voltages on a solid dielectric. The accumulative failure of winding insulation is considered to be a core problem resulting from this phenomenon. The main problems include the accumulative failure of motor winding insulation under pulse-width modulation impulses and the accumulative failure of transformer winding insulation under the application of overvoltages, and these problems represent new challenges in the safe and stable operation of power grids. With regards to the above problems, this study reviews the results of recent research on the accumulative failure characteristics and mechanisms of winding insulation when subjected to repetitive impulse voltages. The challenges faced are discussed at the end of this study.

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Section: Factors Affecting the Failure Characteristics Of Turn-toturnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

et al. 2019

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“…In 1956, Standring firstly proposed the phenomenon whereby the insulation state of a dielectric will degenerate under the action of impulse voltages, which he named "accumulative effect" [5]. However, his study concept was limited to solid and liquid dielectrics in combination.…”

Section: Introductionmentioning

confidence: 99%

Research on the Time-Domain Dielectric Response of Multiple Impulse Voltage Aging Oil-Film Dielectrics

Zhang¹,

Zhao

Xie³

et al. 2021

Energies

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Power capacitors suffer multiple impulse voltages during their lifetime. With the multiple impulse voltage aging, the internal insulation, oil-film dielectric may deteriorate and even fail in the early stage, which is called accumulative effect. Hence, the time-domain dielectric response of oil-film dielectric with multiple impulse voltage aging is studied in this paper. At first, the procedure of the preparation of the tested samples were introduced. Secondly, an aging platform, impulse voltage generator was built to test the accumulative effect of capacitor under multiple impulse voltage. Then, a device was used to test the time-domain dielectric response (polarization depolarization current, PDC) of oil-film dielectric in different aging states. And finally, according to the PDC data, extended Debye model and characteristic parameters were obtained by matrix pencil algorithm identification. The results indicated that with the increase of impulse voltage times, the time-domain dielectric response of oil-film dielectric changed accordingly. The polarization current curve moved up gradually, the insulation resistance decreased when subjected to the repeated impulses. In frequency domain, the frequency spectrum of tan δ changed along with the impulse accumulation aging, especially at low frequency. At last, combined with the aging mechanism of oil-film dielectric under multiple impulse voltage, the test results were discussed.

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“…Transformers are the most important equipment in the power station, whose damage could lead to serious consequences [1][2][3][4]. At present, there are many accidents occurred in the substation equipment, which contains a large number of unidentified insulation accident.…”

Section: Introductionmentioning

confidence: 99%

Research on Evaluation Method of Transient Overvoltage Hazard Based on S-Transform

Tian¹,

Wu²,

Li³

et al. 2017

Proceedings of the 2017 2nd International Symposium on Advances in Electrical, Electronics and Computer Engineering (ISAEECE 20

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In field operation, the transformer with good insulation design and insulation condition may failure caused by transient over-voltage. The accumulation of transient overvoltage reduces the reliability of transformer internal insulation without signs. Therefore, it is necessary to assess the over-voltage hazards on the transformer. In order to evaluate the transient damage of transformers in operation, the transient overvoltage evaluation method based on S transform is proposed in this paper. Firstly, a method based on traditional Fourier transform is introduced. Secondly, the defects of traditional Fourier transform are analyzed. Finally, a transient overvoltage evaluation based on S transform is proposed to overcome the shortcomings of traditional Fourier transform method.

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Breakdown under impulse voltages of solid and liquid dielectrics in combination

Cited by 23 publications

References 0 publications

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

Research on the Time-Domain Dielectric Response of Multiple Impulse Voltage Aging Oil-Film Dielectrics

Research on Evaluation Method of Transient Overvoltage Hazard Based on S-Transform

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