Transient Ground Potential Rise in Gas Insulated Substations??? Experimental Studies

Fujimoto,; Dick,; Boggs,; Ford,

doi:10.1109/mper.1982.5519873

Cited by 6 publications

(5 citation statements)

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“…The inside part constitutes VFTO, while the outside part constitutes the so-called transient enclosure voltages (TEV) [16]. Initially, the wave also crosses the disconnector gap being short-circuited by the electric arc of the spark.…”

Section: Travelling Waves Superimpositionmentioning

confidence: 99%

Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies

Szewczyk¹

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Very fast transient overvoltages (VFTO) originate from steep voltage breakdowns in SF 6 gas that are inherent to operation of any switching device of the gas-insulated switchgear (GIS) type. For power stations with voltage ratings exceeding 500 kV, the ratio between equipment rated-and withstand-voltage levels becomes relatively low, which causes the VFTO peak values to reach the component's insulation withstand-voltage levels, thus becoming a design factor for high-and ultra-high voltage GIS. While well-established approach to VFTO analyses involves only single VFTO events (the so-called single-spark approach), there is often the need to analyze the entire VFTO generation process, for which the multi-spark approach to VFTO modeling is to be employed. The multi-spark approach allows one to evaluate the VFTO impact on the GIS disconnector design along with the impact of the VFTO on selection and dimensioning of the VFTO damping solutions. As the multi-spark approach to VFTO modeling is now being increasingly used in UHV GIS developments as well as for the insulation co-ordination studies of power stations, the present paper is motivated by the need to report on the VFTO multi-spark modeling approach and to lay a common ground for development works that are supported extensively with VFTO simulations. The paper presents physical assumptions and modeling concepts that are in use in such modeling works. Development of the multi-spark GIS disconnector model for VFTO simulations is presented, followed by an overview of examples of the model application for the GIS development works and for insulation co-ordination studies.Key words: very fast transient overvoltages (VFTO), gas-insulated switchgear (GIS), disconnector switch (DS), modeling, simulations, transients, switching, mitigation, breakdown voltage (BDV) characteristics. Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgearand of conducting insulation co-ordination studies To explore the VFTO associated with the operation of the UHV GIS disconnectors, the State Grid Corporation of China (SGCC) has recently established two full-scale test set-ups at the 1100 kV station in Wuhan (China), and conducted measuring campaigns with the total number of disconnector operations of approximately 2000 [8]. Several papers have been published based on this work, addressing different aspects of VFTO measurements and simulations. As an example, in [9] the impact of the disconnectors moving contact speed on the variety of VFTO parameters is analyzed.Also in the previous works conducted by ABB, the VFTO have been investigated to support design work of the 1100 kV disconnector [10,11] and to analyze the impact of the VFTO on selection of the VFTO damping solutions [6]. These works utilized the so-called multi-spark approach [4,12] for modeling the entire process of disconnector operation and to analyze distributions of the VFTO, along with other parameters, such as trapped charge voltage distributions, ...

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Section: Travelling Waves Superimpositionmentioning

confidence: 99%

Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies

Szewczyk¹

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…2. The grounding grid includes two layers of 6 m × 6 m main mesh with a cross section of 100 mm 2 , and a 6.4 m × 9.6 m (in part, 2 m × 3 m) auxiliary mesh with a cross section of 100 mm 2 . The main mash is laid 3.5 m below the concrete floor, and the auxiliary mesh is embedded in concrete 500 mm below the ground surface.…”

Section: Construction Of Grounding Gridmentioning

confidence: 99%

“…Therefore, the grounding grid and transient impedance must be examined in terms of transient oscillations of the ground potential and tank potential. However, there are few reports on the measurement and analysis of these parameters in grounding systems of real substations [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Transient response of a grounding system in an underground GIS substation

Okabe

Yamada

Nojima

et al. 2003

Electrical Engineering Japan

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SUMMARYThe transient grounding impedance of a gas-insulated switchgear (GIS) substation was investigated through measurements on a commercial 300-kV underground substation. Using the results, the transient impedance of the grounding grid was investigated. The attenuation factor of the propagation line composed of the outer surface of the GIS tank and the concrete floor was also evaluated. The validity of EMTP analysis of surge phenomena in the GIS grounding system was confirmed.

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“…Just because of the characteristics of compact structure, complex nodes, and distinct wave propagation, the operation of disconnect switch or circuit breaker will cause very high‐frequency electromagnetic pulse (EMP) up to tens even hundreds of megahertz. As a result, high‐frequency EMP coupling to GIS enclosure leads to the transient enclosure voltage (TEV) which does harm to system insulation, secondary devices, and operating crew [1–3].…”

Section: Introductionmentioning

confidence: 99%

The electromagnetic effect study of GIS enclosure under high‐frequency electromagnetic pulse

Chen

Guo

et al. 2018

J. eng.

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Transient Ground Potential Rise in Gas Insulated Substations??? Experimental Studies

Cited by 6 publications

References 0 publications

Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies

Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies

Transient response of a grounding system in an underground GIS substation

The electromagnetic effect study of GIS enclosure under high‐frequency electromagnetic pulse

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