2012
DOI: 10.1109/tpwrd.2012.2194724
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Grounding System Transient Characteristics of Underground GIS Substations

Abstract: The transient grounding impedance of a gas-insulated switchgear (GIS) substation was investigated through measurements on a commercial 300-kV underground substation. Based on the results, the macroscopic transient impedance of the grounding grid was clarified to be the inductance component and estimated at approximately 0.2 H. In the low-frequency region where the frequency is almost zero or so, the impedance is shown to be lower than the general concrete resistance value by one digit due to the complexity of … Show more

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Cited by 12 publications
(6 citation statements)
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“…Three transient spikes occur within 100 us. Through testing, it can be concluded that during the normal switching operation of the substation, a transient VFTO of several kV/m is generated, and a transient current or voltage is also generated [24].…”
Section: Vfto Radiation Field Measurement Of a 330 Kv Substationmentioning
confidence: 99%
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“…Three transient spikes occur within 100 us. Through testing, it can be concluded that during the normal switching operation of the substation, a transient VFTO of several kV/m is generated, and a transient current or voltage is also generated [24].…”
Section: Vfto Radiation Field Measurement Of a 330 Kv Substationmentioning
confidence: 99%
“…The processed signal will transmit to the merge unit (MU) by the optical fiber port, where the MU inversely processes the optical signal to the analog signal again. The MU is shown in Figure 4c Through testing, it can be concluded that during the normal switching operation of the substation, a transient VFTO of several kV/m is generated, and a transient current or voltage is also generated [24].…”
Section: Introduction Of Electronic Current Transformer Acquisition Cardmentioning
confidence: 99%
“…For the same lightning strike current, the peak voltage is computed as 143.8 kV, which is far below those calculated above. The aforementioned analysis shows that using (5) to determine the inductance of the electrode is not accurate under fast and very fast transient conditions. This is because in the circuit models, the wave propagation delay and consequently its effects on the voltage response cannot be predicted.…”
Section: Analysis Of Transient Voltage Responsementioning
confidence: 99%
“…Therefore, the inductance cannot be computed using (18). Even though a formula for calculating electrode inductance is given in (5), the computed inductance is more suitable for distributed (where the inductance is distributed into many sections) rather than a lumped circuit element. Using this formula for a lumped circuit element will result in a significant error in the voltage response, especially when the maximum steepness occurs close to the maximum current, such as in the CIGRE current.…”
Section: ) Circuit Response Of the Iec Current Waveformmentioning
confidence: 99%
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