Estimation and Analysis of VFTO at Various Locations in 132kV GIS Substation

Bamne, Sharique; Kinhekar, Nandkishor

doi:10.1109/iccpeic.2018.8525215

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…e expression for the suppression effect α in this article is given by (7), where U 1 and U 2 represent, respectively, the initial disturbance voltage and the disturbance voltage after adopting protective measures.…”

Section: Effect Of a Spiral Tube Damped Bus On The Vftomentioning

confidence: 99%

“…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]. Due to the distributed capacitance between the transformer and the high-voltage bus, a VFTO will invade the secondary side of the transformer through the distributed capacitance and then enter the control chamber through the cable in the form of conduction, interfering with the secondary equipment and threatening the safe operation of the whole system [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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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: Effect Of a Spiral Tube Damped Bus On The Vftomentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Various types of transient voltages can be found in a power grid. The fastest transient voltages (i.e., very fast front overvoltage, VFFO) usually appear at a gas-insulated switchgear (GIS), which is caused by the operation of the GIS disconnectors [2][3][4]. A VFFO commonly has high frequency components of approximately 100 MHz and a rising time of several nanoseconds [5].…”

Section: Introductionmentioning

confidence: 99%

Application of Integrated Optical Electric-Field Sensor on the Measurements of Transient Voltages in AC High-Voltage Power Grids

Xie¹,

Yang

et al. 2019

Applied Sciences

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Transient voltages in the power grid are the key for the fault analysis of a power grid, optimized insulation design, and the standardization of the high-voltage testing method. The traditional measuring equipment, based on electrical engineering, normally has a limited bandwidth and response speed, which are also featured by a huge size and heavy weight. In this paper, an integrated optical electric-field sensor based on the Pockels effect was developed and applied to measure the transient voltages on the high-voltage conductors in a non-contact measuring mode. The measuring system has a response speed faster than 6 ns and a wide bandwidth ranging from 5 Hz to 100 MHz. Moreover, the sensors have the dimensions of 18 mm by 18 mm by 48 mm and a light weight of dozens of grams. The measuring systems were employed to monitor the lightning transient voltages on a 220 kV overhead transmission line. The switching transient voltages were also measured by the measuring system during the commissioning of the 500 kV middle Tibet power grid. In 2017, 307 lightning transient voltages caused by induction stroke were recorded. The characteristics of these voltage waveforms are different from the standard lightning impulse voltage proposed by IEC standards. Three types of typical switching transient voltage in 500 kV AC power grid were measured, and the peak values of these overvoltages can reach 1.73 times rated voltage.

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Mitigation of VFTO from a Power Transformer bushing in a 275 kV Gas Insulated Substation

Ahmed,

Illias,

Mokhlis

et al. 2024

2024 International Seminar on Intelligent Technology and Its Applications (ISITIA)

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Estimation and Analysis of VFTO at Various Locations in 132kV GIS Substation

Cited by 5 publications

References 7 publications

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

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

Application of Integrated Optical Electric-Field Sensor on the Measurements of Transient Voltages in AC High-Voltage Power Grids

Mitigation of VFTO from a Power Transformer bushing in a 275 kV Gas Insulated Substation

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