Determination of Breakdown Voltage Characteristics of 1'100 kV Disconnector for Modeling of VFTO in Gas-Insulated Switchgear

Szewczyk, Marcin; Kuniewski, Maciej; Piasecki, Wojciech; Florkowski, Marek; Straumann, U.

doi:10.1109/tpwrd.2015.2513080

Cited by 21 publications

(26 citation statements)

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“…2. In the multi-spark modeling approach [4], voltage conditions are simulated for the entire process of the GIS disconnector operation, and then all of the VFTO events are represented in the model as occurring for specific times of the spark ignitions.…”

Section: Voltage Conditions and Breakdown Flashovers (Sparks)mentioning

confidence: 99%

“…Full approach to VFTO modeling involves multi-spark simulations with design-specific breakdown voltage (BDV) characteristics, as reported in [4]. BDV can be obtained from full-scale measurements of VFTO waveforms as originating from the operations of a real GIS disconnector.…”

Section: Breakdown Voltage Characteristicsmentioning

confidence: 99%

“…The full measurement data obtained from fullvoltage w across the disconnector insolating distance , where w is the equipment nameplate's rated voltage and the value of is provided by the manufacturer. With these assumptions, the simplified BDV can be described with the following formulas: M. Szewczyk [20] for type testing can be used, however other test set-ups that are established as a part of development tests can be utilized as well [4]. Also, VFTO waveforms can be used as obtained from the measuring campaigns that are executed in the test set-ups according to customer specifications, as reported in e.g.…”

Section: Voltage Characteristicsmentioning

confidence: 99%

“…[3]). Consequently, VFTO analyses are now being increasingly employed for design work and to support type testing of (primarily) GIS disconnectors [4,5]. Furthermore, the VFTO analyses results are often used to support a decision on application, selection and dimensioning of the VFTO damping solutions [6,7], which in some cases are required to maintain the VFTO peak values at an 872 Bull.…”

Section: Introductionmentioning

confidence: 99%

“…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, arcing time and number of sparks -and the mutual effect of these qualities and the GIS disconnector design.…”

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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: Voltage Conditions and Breakdown Flashovers (Sparks)mentioning

confidence: 99%

Section: Breakdown Voltage Characteristicsmentioning

confidence: 99%

Section: Voltage Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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