Statistical analysis on measured lightning overvoltage surges in a 110 kV air‐insulated substation

Sima, Wenxia; Xing, Lidan; Yang, Qing; Yuan, Tao

doi:10.1049/iet-smt.2013.0235

Cited by 29 publications

(19 citation statements)

References 24 publications

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“…However, impulse voltages, which include lightning impulse voltages and switching impulse voltages, occur frequently in power systems. Long-term monitoring results indicate that a typical power transformer may be subjected to tens of thousands of impulse voltages during its life cycle [89][90][91]. The oil-paper insulation that is used in power transformers may temporally maintain its electrical performance after the accumulation of repetitive impulse voltages.…”

Section: Introductionmentioning

confidence: 99%

“…The typical waveform of a transformer-invading impulse voltage is shown in Fig. 9 [ [89][90][91]. For example, Okabe et al presented four typical nonstandard impulse waveforms that were recorded at a power substation.…”

Section: Introductionmentioning

confidence: 99%

“…iii. Repeated application: An overvoltage monitoring system has been installed in a 110 kV substation located in China [89][90][91].…”

Section: Introductionmentioning

confidence: 99%

“…The voltage sensor was installed on the bushing tap of the main transformer. The monitoring work was performed for 11 years, and statistical data indicated that more than 50 lightning impulse voltages were recorded per year [89][90][91]. If we assume that the lifetime of a typical power transformer is 30 years, then the transformer will suffer more than 1500 lightning impulses during its lifetime.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…iii. Repeated application: An overvoltage monitoring system has been installed in a 110 kV substation located in China [89][90][91].…”

Section: Introductionmentioning

confidence: 99%

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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“…Different protection methods should be used according to the type of the lightning stroke fault. These stroke faults should be identified to efficiently adopt targeted measures against lightning and improve lightning protection design [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Jiang

Chen

et al. 2019

Energies

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Direct lightning strokes account for a large proportion of line faults. Lightning faults can be classified into several kinds, and the corresponding protection methods differ. The type of these lightning faults should be identified to establish targeted measures against lightning and improve lightning protection design. In this study, a non-contact multi-physical parameter lightning monitoring system is proposed. The voltage of the insulator string and the lightning grounding current of the transmission tower are chosen as two physical parameters to show the characteristic quantities of different lightning stroke types. These physical parameters are captured using a non-contact overvoltage sensor installed at the cross arm of the tower and several parallel Rogowski coils installed at the tower ground supports. An equivalent electromagnetic transient model of a 110 kV transmission line is developed to identify features of the signals under different lightning strokes. Based on time-domain and wavelet transform modulus maxima (WTMM) analyses, the polarity of insulator voltage, the polarity of tower current, and the mutation polarity of tower current when insulators flashover are extracted as characteristic quantities of polarity discrimination. Six kinds of direct lightning strokes can be identified based on the polarity discrimination method considering the lightning stroke point and the lightning current polarity. The identification method is verified by simulation data and application to an actual example.

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Study on Consistency of Failure Probability Characteristics of Oil-Paper Insulation Under Different Impulse Voltages

Xie¹,

Jiang

Lian

et al. 2019

Lecture Notes in Electrical Engineering

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Statistical analysis on measured lightning overvoltage surges in a 110 kV air‐insulated substation

Cited by 29 publications

References 24 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

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Study on Consistency of Failure Probability Characteristics of Oil-Paper Insulation Under Different Impulse Voltages

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