Electromagnetic disturbances in gas-insulated substations and VFT calculations

Ametani, Akihiro; Xue, Haoyan; Natsui, Masashi; Mahseredjian, Jean

doi:10.1016/j.epsr.2018.02.014

Cited by 20 publications

(2 citation statements)

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“…When the isolating switch of GIS is operated with power, its contact gap voltage drops rapidly. With multiple breakdowns and discharge of SF 6 gas, a very fast transient (VFT) of several megahertz to tens of megahertz is generated between the contacts [1][2][3]. VFT propagates in the form of a traveling wave and forms a very fast transient overvoltage (VFTO) with a short rise time and large amplitude after multiple refractions in GIS [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Interference to the Secondary Cable Caused by a Very Fast Transient Overvoltage in a Gas-Insulated Switchgear Substation

Lin

Zhang

Liu

et al. 2022

Mathematical Problems in Engineering

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When a very fast transient overvoltage (VFTO) propagates in a high-voltage bus, the capacitive voltage transformer (CVT) causes considerable interference on its secondary side, which will affect the normal operation of the secondary equipment. In this article, a CVT equivalent calculation circuit model was established, and the disturbance voltage of the secondary cable was deduced and calculated. Using electromagnetic transient simulation software, a simulation model of the secondary cable disturbance caused by the VFTO in a 500 kV gas-insulated switchgear (GIS) substation was established, the disturbance voltage at the end of the secondary cable was simulated and analyzed, and the effects of the length of the secondary cable and the grounding mode of the shield on the disturbance were studied. Combined anti-interference measures are also suggested, which use a spiral tube damping busbar, grounding at both ends of the shield using multistrand conductors and installing filter capacitors, all of which greatly reduce the amplitude and harmonic components of the disturbance voltage of the secondary cable.

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Section: Introductionmentioning

confidence: 99%

Interference to the Secondary Cable Caused by a Very Fast Transient Overvoltage in a Gas-Insulated Switchgear Substation

Lin

Zhang

Liu

et al. 2022

Mathematical Problems in Engineering

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“…Very fast transient overvoltage (VFTO) is one of the main factors affecting the stable operation and insulated intension designs of primary electric power equipment in substations, and it is also the main electromagnetic disturbance source of secondary equipment [ 1 , 2 , 3 ]. When the disconnector in gas-insulated switchgear (GIS) is operated, a repeated breakdown process occurs between the contact gaps, resulting in a steep pulse traveling wave.…”

Section: Introductionmentioning

confidence: 99%

Development and Experimental Research of VFTO Measuring Sensor

Teng¹,

Zhao²,

Wang³

et al. 2022

Sensors

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Very fast transient overvoltage (VFTO) generated by an operating disconnector is one of the main reasons for electromagnetic disturbance in gas-insulated switchgear (GIS) substations. Generally, the amplitude of VFTO can be used as one of the references for the insulation design of GIS primary electric power equipment, so it is necessary to obtain its accurate amplitude. In this study, a new VFTO measuring sensor is developed and its measurement performance is demonstrated through hundreds of operations by a disconnector in a 220 kV GIS test circuit. The validation shows that the low cut-off frequency of the new VFTO measuring sensor has been greatly expanded to 0.01 mHz, which is improved by about 50% compared with the old sensor. The measurement accuracy of amplitude of VFTO micro-pulse improves greatly by about 80% compared with the old one. Thus, the new VFTO measuring sensor can fully meet the measurement needs of trapped charge voltage, power frequency voltage, and high-frequency transient voltage in VFTO waveform. It can be used to provide more accurate data support for insulation design of GIS primary power electric equipment in extra-high voltage (EHV) and ultra-high voltage (UHV) GIS substations.

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