Computation of very fast transient overvoltages (VFTO) in a 1000 kV gas insulated substation

Haseeb, Muhammad; Thomas, M. Joy

doi:10.1109/appeec.2017.8308964

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…Ma and Li et al [4] show that the maximum amplitude of VFTO generated in 1100-kV substation is less than 1.5 p.u. We calculated that the VFTO amplitude range of 500-kV substation with long GIS busbar is 1.01 to 2.52 p.u., which is consistent with the maximum amplitude range reported in other literature [5,18]. Since the stage of reburning is random, the theoretical maximum surge rarely occurs in practical operation.…”

Section: Maximum Value Of Vfto Voltage Waveformsupporting

confidence: 91%

“…[14] reported that the dominant oscillating frequencies of the VFTO are 3.5 MHz, 1.6 MHz, and 650 kHz. Haseeb and Thomas [5] using EMTP reported that major frequency components in the simulated VFTO lie in the range of 840 kHz to 30 MHz. Povh and Schmitt et al.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

“…Ma et al [14] reported that the dominant oscillating frequencies of the VFTO are 3.5 MHz, 1.6 MHz, and 650 kHz. Haseeb and Thomas [5] using EMTP reported that major frequency components in the simulated VFTO lie in the range of 840 kHz to 30 MHz. Povh and Schmitt et al [17] figured that the main frequencies of the VFT depend on the length of the GIS section affected by the disconnector switch operation and are in the range of 1 MHz up to 40 MHz for the basic component.…”

Section: Vfto Voltage Waveform Frequency Analysismentioning

confidence: 99%

“…The peak value of VFTO calculated by simulation may reach 3 p.u. [5,7], and the frequency of VFTO is usually 100 kHz to 100 MHz [17,20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their frequent occurrence, it will lead to the ageing of system insulation [3,4]. In addition to causing faults in the gas-insulated bus duct of the substation, VFTO may also lead to the faults in protection and control circuit [5]. The insulation fault of GIS caused by VFTO has attracted the attention of researchers and becomes a research hotspot all over the world [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Very fast transient overvoltage calculation and evaluation for 500‐kV gas insulated substation power substation with double circuit and long gas insulated substation busbar

Wang

et al. 2022

IET Generation Trans & Dist

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The operation of disconnectors in gas insulated substation (GIS) or power plant will produce very fast transient overvoltage (VFTO), which is considered to have serious harm to transformer longitudinal insulation and other high‐voltage equipment insulation. VFTO may also lead to secondary circuit failure. In this paper, the holistic modelling of 500 kV GIS step‐up substation equipment with a double circuit and long GIS busbar in a coastal power plant is established using Electromagnetic Transient Program (EMTP). The authors calculated the VFTO waveform that may be generated in different operations of the GIS substation. The authors analyze the amplitude and frequency characteristics of the VFTO waveform at lightning arresters and the entrance of transformers and find that the amplitude of VFTO at the entrance of #1 MT is less than its impulse withstand voltage. In some cases, the VFTO waveform at the entrance of #1 MT has high‐frequency content with fast attenuation. The VFTO waveform generated when operating the disconnector close to the arrester will cause the arrester to act many times and count frequently in a short time.

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Section: Maximum Value Of Vfto Voltage Waveformsupporting

confidence: 91%

Section: Results Analysis and Discussionmentioning

confidence: 99%

Section: Vfto Voltage Waveform Frequency Analysismentioning

confidence: 99%

“…The peak value of VFTO calculated by simulation may reach 3 p.u. [5,7], and the frequency of VFTO is usually 100 kHz to 100 MHz [17,20,21].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Very fast transient overvoltage calculation and evaluation for 500‐kV gas insulated substation power substation with double circuit and long gas insulated substation busbar

Wang

et al. 2022

IET Generation Trans & Dist

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Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

et al. 2023

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The switching operation of gas insulated switchgear (GIS) disconnector will produce multiple random spark discharges between the gas gaps of the disconnector. Each spark discharge can be affected by various random factors, such as trapped charge on the load side, the initial operating phase, gap distance and operating speed of the disconnector, leading to dispersion characteristics. At present, some studies have mentioned this dispersion, but its impact is still unclear due to the lack of experimental data, resulting in a deviation between the simulation results and the measured results. In this study, thousands of switching operations were carried out based on the 1100 kV full‐scale GIS circuit in Wuhan ultra‐high voltage alternating current Test Base. The maximal information coefficient analysis, linear regression fitting and other statistical methods were used to discuss the dispersion characteristics of very fast transient overvoltage (VFTO) and transient enclosure voltage (TEV) from large‐scale experimental data. The results show that the dispersion of VFTO and TEV in amplitude aspects both increase gradually as the breakdown voltage increases, with the maximum difference of five times of TEV amplitude at normalised breakdown voltage. In terms of frequency characteristics, the dispersion of different frequency components in TEV is always greater than that of VFTO, especially for the high‐frequency components. Moreover, by comparing the frequency characteristics of TEV at different positions, we notice that the dispersion is almost independent of the spatial position but only determined by the randomness of spark discharges. These discoveries reveal the importance of the dispersion in switching transients and make up for the lack of theoretical understanding of the correlation among them.

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Experimental Research on Strong Transient Electromagnetic Interference in Substation

Lin¹,

Naiyong²,

Ma³

et al. 2021

2021 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

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Computation of very fast transient overvoltages (VFTO) in a 1000 kV gas insulated substation

Cited by 4 publications

References 16 publications

Very fast transient overvoltage calculation and evaluation for 500‐kV gas insulated substation power substation with double circuit and long gas insulated substation busbar

Very fast transient overvoltage calculation and evaluation for 500‐kV gas insulated substation power substation with double circuit and long gas insulated substation busbar

Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

Experimental Research on Strong Transient Electromagnetic Interference in Substation

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