Estimation of Restriking Transient Overvoltage on Disconnecting Switch for GIS

Ogawa, Soichi; Haginomori, Eiichi; Nishiwaki, S.; Yoshida, Takeshi; Terasaka, Kenichiro

doi:10.1109/tpwrd.1986.4307939

Cited by 40 publications

(10 citation statements)

References 3 publications

(3 reference statements)

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“…Elbows, spacers, and spherical shields are modeled by a lumped capacitance of 15 pF. Here, the surge arrester is represented by a capacitance of 200 pF when simulating VFT resulting from DS . Different model has been selected for open and closed states of switches.…”

Section: Modeling Of Gas‐insulated Substation Componentsmentioning

confidence: 99%

“…The most onerous condition in a switching operation happens during a voltage collapse of 2 per unit (1 per unit on the source side and 1 per unit on the load side). This has been simulated in the present study .…”

Section: Modeling Of Gas‐insulated Substation Componentsmentioning

confidence: 99%

“…During the closing operation of switches, the sparks are modeled by a fixed resistance in series with an exponentially decreasing resistance .

R (t) = R_{0} e^{- (\frac{t}{τ})} + r

where R 0 is taken as 10 12 , τ is 1 ns, and r = 0.5 Ω.…”

Section: Modeling Of Gas‐insulated Substation Componentsmentioning

confidence: 99%

See 2 more Smart Citations

Suppression of very fast transients in gas‐insulated substation via terminal and capacitance components—feasibility study

Tavakoli

Gholami

Alamuti

2011

Int Trans Elec Energy Syst

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SUMMARY Reportedly, the switching operation in a gas‐insulated substation (GIS) can lead to deformation of transformer winding. Also, electromagnetic fields radiated because of switching operations get coupled to the control equipment or data cables present in the GIS. These problems during switching operations in the GIS depend on the wave shape of the very fast transient overvoltages (VFTOs) and the associated very fast transient currents (VFTCs). Available methods are utilizing ferromagnetic rings and resistors to suppress the stresses created by very fast transient (VFT) from the source side. These equipment are mounted on the conductors linked to the disconnector. However, current methods are only applicable before installation period and during the substation design stage. The aim of this paper is to investigate feasible methods for mitigation of the overvoltage magnitude of VFT and suppression of the resonant frequencies amplitude at the power transformer. The proposed method utilizes terminal and capacitance components to suppress VFTs in GIS. Its advantages are their simplicity and low cost of implementation along with producing minimal changes in the installed GIS. The effectiveness of the proposed method to mitigate overvoltage magnitude and resonant frequencies amplitude of VFT is presented via simulation. In addition, the amplitude and frequency spectrum of the VFTO and VFTC at the various locations have been analyzed in this paper. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Modeling Of Gas‐insulated Substation Componentsmentioning

confidence: 99%

Section: Modeling Of Gas‐insulated Substation Componentsmentioning

confidence: 99%

See 1 more Smart Citation

Suppression of very fast transients in gas‐insulated substation via terminal and capacitance components—feasibility study

Tavakoli

Gholami

Alamuti

2011

Int Trans Elec Energy Syst

View full text Add to dashboard Cite

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“…Other problems such as erroneous operation and failure of electronic control circuits connected to GIS units are subjected to electromagnetic interference by VFTO. Furthermore, it has been reported that the dielectric strengths of non-uniform electric fields formed by the metallic particles involved are reduced when VFTO are applied [5].…”

Section: Introductionmentioning

confidence: 99%

Spark model for 1100kV GIS disconnecting switch

Ji-ling

Zhan

Duan

et al. 2011

2011 1st International Conference on Electric Power Equipment - Switching Technology

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In order to make the VFTO simulation more accurate, the spark characteristic of disconnecting switch and modeling is studied. The experimental circuit of the 1100kV GIS is simulated, and according to various computing resistance formulas of spark channels, the spark generated by disconnecting switch operation is modeled. The simulated voltage waveforms of the load side are compared with the measurement results. The simulated VFTO is obtained when different disconnecting switch spark models are adopted, with low-frequency oscillations of 200 kHz and 6 MHz, high-frequency of 36 MHz and 56 MHz, and the frequency range is basically consistent with the experimental results. The circuit oscillation frequency is mainly the same compared to different high-frequency decay rate with different spark models. The comparison shows that the simulated voltage waveforms of the load side match the experimental data better than others when Kushner model is adopted. However, the high-frequency attenuation rate of the simulated voltage at the load side is slower than that of the measuring voltage when Kushner model is used. Therefore, further developments in Kushner model are needed in order to reproduce with better accuracy the dynamic behavior of the disconnecting switch spark resistance.I.

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“…Due to the excellent insulation characteristics of SF~ gas, gas-insulated switchgear (GIS) is used widely at high-voltage substations. It is well known that fast transient overvo1tages (FTO) with risetimes of several nanoseconds are generated as a result of operation of the disconnector installed in GIS [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%