Very Fast Transients in a 500 kV Gas-Insulated Substation

Xue, Haoyan; Ametani, Akihiro; Mahseredjian, Jean

doi:10.1109/tpwrd.2018.2874331

Cited by 20 publications

(7 citation statements)

References 35 publications

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“…We observe that the VFTO obtained by the new measuring sensor have roughly the same characteristics as the typical VFTO waveforms given in the Refs. [ 4 , 9 ], which means that the measuring sensor can completely record VFTO signals.…”

Section: Vfto Measurement Resultsmentioning

confidence: 99%

“…The wave propagates along the GIS pipeline and refracts or reflects many times at the place where the wave impedance is discontinuous, and forms very fast transient overvoltage [ 4 , 5 , 6 , 7 ]. Especially in extra-high voltage (EHV) and ultra-high voltage (UHV) substations, the high amplitude of VFTO will cause more series faults such as insulation damage to the GIS main circuit and adjacent equipment due to the decrease in insulation margin of the primary electric power equipment [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Vfto Measurement Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and Experimental Research of VFTO Measuring Sensor

Teng¹,

Zhao²,

Wang³

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…For completely enclosed sections of bus, the skin effect confines the transients internally for the VFT frequency range and above. Meshing of the entire metallic domain can thus be avoided and metal losses can be accounted for by applying an impedance boundary condition, represented by Equation (5).…”

Section: Of 17mentioning

confidence: 99%

“…However, existing frequency-dependent line models available in alternative transients program-electromagnetic transients program (ATP-EMTP) [3] have proven to be numerically unstable at very high frequencies [4]. New methods reported in [5], adopt a modified transmission line approximation, due to the possible mode conversion for waves propagating over a lossy ground from transverse electromagnetic (TEM) mode to surface wave propagation in the VFT frequency range, which are subject to lower attenuation. This finding could impact the extent of the region under study and also allow numerically stable, frequency-dependent line or cable parameters to be produced directly in ATP-EMTP.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Very Fast Transients Using Black Box Macromodels in ATP-EMTP

et al. 2020

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Modelling for very fast transients (VFTs) requires good knowledge of the behaviour of gas insulated substation (GIS) components when subjected to high frequencies. Modelling usually takes the form of circuit-based insulation coordination type studies, in an effort to determine the maximum overvoltages and waveshapes present around the system. At very high frequencies, standard transmission line modelling assumptions may not be valid. Therefore, the approach to modelling of these transients must be re-evaluated. In this work, the high frequency finite element analysis (FEA) was used to enhance circuit-based models, allowing direct computation of parameters from geometric and material characteristics. Equivalent models that replicate a finite element model’s frequency response for bus-spacer and 90° elbow components were incorporated in alternative transients program-electromagnetic transients program (ATP-EMTP) using a pole-residue equivalent circuit derived following rational fitting using the well-established and robust method of vector fitting (VF). A large model order is often required to represent this frequency dependent behaviour through admittance matrices, leading to increased computational burden. Moreover, while highly accurate models can be derived, the data extracted from finite element solutions can be non-passive, leading to instability when included in time domain simulations. A simple method of improved stability for FEA derived responses along with a method for identification of a minimum required model order for stability of transient simulations is proposed.

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“…Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problems in power systems have been paid more and more attention [9]. Transient electromagnetic field generated during switching operation is one of the important sources of electromagnetic interference in substations [10].…”

Section: Introductionmentioning

confidence: 99%