Estimation of Restriking Transient Overvoltage on Disconnecting Switch for GIS

Ogawa, Takumi; Haginomori,; Nishiwaki,; Yoshida, Minoru; Terasaka,

doi:10.1109/mper.1986.5527717

Cited by 11 publications

(10 citation statements)

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“…VFTO is the phenomenon of transient overvoltage generated during switching operation characterized by very short rise-time of 4 to 100 ns and has been covered by various literatures [3,[12][13][14][15][16][17][18][19][20][21][22]. The phenomenon is particularly significant during Disconnect Switch (DS) operation due to multiple-restriking in the DS due to lack of arc-suppressing chamber.…”

Section: Switching Surges and Very Fast Transient Overvoltage (Vfto)mentioning

confidence: 99%

Power System Protection Design for NPP

Lee¹,

Chen²

2012

Nuclear Power- Practical Aspects

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Section: Switching Surges and Very Fast Transient Overvoltage (Vfto)mentioning

confidence: 99%

Power System Protection Design for NPP

Lee¹,

Chen²

2012

Nuclear Power- Practical Aspects

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“…With cable-based substations, lightning surges penetrating from outside are small, and overvoltages related to disconnector surges and other internal reignition surges gain importance. Disconnector charges normally have sharp oscillatory waveforms with rapid damping, which is very different from the standard lightning impulse waveforms [10,11]. This paper deals with typical single-frequency oscillatory waveforms obtained by transient analysis (EMTP) of GIS surges in a 500-kV cable-based model substation.…”

Section: Introductionmentioning

confidence: 99%

Insulation characteristics of GIS under nonstandard lightning‐impulse oscillations: Insulation characteristics under single‐frequency oscillations with various frequencies and damping ratios

Yuasa

Suzuki

Okabe

2003

Electrical Engineering Japan

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SUMMARYTo improve GIS insulation specifications, it is important to recognize the insulation characteristics under oscillatory overvoltage waveforms occurring in the field. This paper describes investigations of insulation characteristics for single-frequency oscillatory waveforms with various frequencies and damping ratios. It was found that minimum breakdown voltages (V min ) rose with frequency rising under the same damping condition and V min rose with damping ratio rising under the same frequency condition. From an analysis of actual breakdown voltage characteristics, the probability of breakdown at a valley of oscillation rose with damping increasing. It was found that the insulation characteristics were treated all-inclusively based on the characteristics of V min for rise time or damping time.

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“…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%

“…These traveling waves repeat reflections at the GIS ends and branches, finally becoming highly complicated waveforms. At the same time, it has been noted that there is a possibility that the levels of FTO exceed 3.0 pu (1 pu is the crest value of operating voltage) [2]. Further, as problems involving FTO, not only is the phenomenon of flashover to ground from interpo1e arcs of operating disconnectors [3,4] discussed, but also the influences on transformers, bushings, and other devices [5].…”

Section: Introductionmentioning

confidence: 99%