Transient Ground Potential Rise in Gas Insulated Substations - Experimental Studies

Fujimoto, Noboru; Dick, E.P.; Boggs, S.A.; Ford, G. L.

doi:10.1109/tpas.1982.317033

Cited by 59 publications

(7 citation statements)

References 5 publications

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“…Strictly speaking, the characteristic impedance of the conductor configured vertical to the ground is not constant; however, the following equation is often used for the practical use [10]. (5) Here, h is the average height of the grounding wire and r is the equivalent radius of the grounding wire.…”

Section: Resultsmentioning

confidence: 99%

“…If partial discharge occurs in GIS caused by metallic particles or the like, electromagnetic waves with the frequency components up to several GHz are generated [1,2] inside the GIS tank and also high frequency surges ranging from several MHz up to 100 MHz are generated due to reignited arc when the switchgear operates [3,4]. These electromagnetic waves and high frequency surges cause the leakage of a high frequency surge voltage to the outside of the GIS tank through the part electrically divided, if any, such as the isolated flange part of the GIS tank and the cable connection part [5,6]. If these electromagnetic waves or high frequency surges leak to the outside of the tank, electromagnetic waves or high frequency surges are generated in the grounded system and in one sense can be used for partial discharge detection and, on the other hand, may cause the electromagnetic interference (EMI) with adjoining electronic devices via the grounded system [7].…”

Section: Introductionmentioning

confidence: 99%

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Circuit models of gas insulated switchgear elements for electromagnetic wave leakage analysis

Okabe

Takami

Nojima

2008

IEEE Trans. Dielect. Electr. Insul.

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The leakage of electromagnetic waves and high frequency surges caused by the partial discharge inside gas insulated switchgear (GIS) to the outside of its tank may become a signal for the partial discharge detection, and, on the other hand, possibly cause electromagnetic interference (EMI) to electronic equipment via the grounded system. It is, therefore, important to investigate and understand the leakage phenomenon of electromagnetic waves and high frequency surges to the grounded system of the GIS. In the present study, experiments of the characteristics of leaking electromagnetic waves and high frequency surges were conducted using test models for the cable connections, the disconnecting switch (DS), the earth switch (ES), the capacity type potential divider (PD) inside the GIS, and the grounding wire to clarify the characteristics of the respective elements. These results could be approximated using distributed parameter circuits, and models for the leakage surge analysis were proposed.Index Terms -Gas insulated switchgear (GIS), leaking electromagnetic waves, high frequency surges, cable connections, disconnecting switch (DS), earth switch (ES), capacity type potential divider (PD), grounding wire, framework, EMI.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circuit models of gas insulated switchgear elements for electromagnetic wave leakage analysis

Okabe

Takami

Nojima

2008

IEEE Trans. Dielect. Electr. Insul.

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“…(2) at least four data channels to correlate different EM1 measurements simultaneously. (3) each channel should have a bandwidth of at least 100 MHz and a dynamic range of at least 45 dB. (4) 100 m to 200 m long, remotely controllable, analog fiber optic data links for immunity from EM1 environment and installation flexibility.…”

Section: Substation Em1 Issues Have Been Investigated Inmentioning

confidence: 99%

Transient electromagnetic interference in substations

Wiggins¹,

Thomas²,

Nickel³

et al. 1994

IEEE Trans. Power Delivery

103

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Electromagnetic interference levels on sensitive electronic equipment are quantified experimentally and theoretically in air and gas insulated substations of different voltages. Measurement techniques for recording interference voltages and currents and electric and magnetic fields are reviewed and actual interference data are summarized. Conducted and radiated interference coupl ing mechanisms and levels in substation control wiring are described using both measurement results and electromagnetic models validated against measurements. The nominal maximum field and control wire interference levels expected in the switchyard and inside the control house from switching operations, faults, and an average lightning strike are estimated using high frequency transient coupl ing models. Comparisons with standards are made and recomnendations given concerning equipment shielding and surge protection.

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“…Ford and Geddes [3] calculated the mechanism of TEV increase in GIS based on the multiconductor transmission line theory and studied the influence of TEV on adjacent equipment and staff. Based on theoretical analysis and experimental measurement, Fujimoto et al [4] conducted in-depth research on TEV generation and propagation mechanisms and related characteristics in GIS. Dick et al [5] further analyzed, calculated, and simulated TEV; deduced transient potential from shell structure; and proposed modifications to operating procedures, changes to the GIS configuration, and other suppression measures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Discharge Faults Between Flanges Caused by Transient Enclosure Voltage

Li¹,

Wang

et al. 2020

IEEE Access

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An increase in transient enclosure voltage can threaten the personal safety of workers and the normal operation of secondary equipment and may cause discharge between the flanges of gas insulated switchgear (GIS) enclosures. This study considered the spark-discharge fault between GIS enclosure flanges of a 500-kV nuclear power plant in China when the disconnect switch is operated in the background. The dynamic arc model during the operation of the disconnect switch was improved in this study, and the equivalent calculation model of transient enclosure voltage (TEV) caused by very fast transient overvoltage generated during the operation of the disconnect switch was established using the electromagnetic transient program ATP-EMTP. Suppression measures of the discharge phenomena were also discussed. The results demonstrated that the transient enclosure voltage caused by the operation of the disconnect switch can reach 75 kV in the most severe case, which causes discharge between the flanges. Reducing the residual charge on the island side of the disconnect switch, installing a metal oxide arrester, and reducing the inductance of the ground wire have different inhibitory effects on this discharge phenomenon, but they all have their limitations. The most simple and effective control measure is to use a short joint between two flanges. The study conclusions can be used as reference for preventing such discharge phenomena. INDEX TERMS Transient enclosure voltage, discharge between flanges, improved arc model, inhibition of measures.

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Transient Ground Potential Rise in Gas Insulated Substations - Experimental Studies

Cited by 59 publications

References 5 publications

Circuit models of gas insulated switchgear elements for electromagnetic wave leakage analysis

Circuit models of gas insulated switchgear elements for electromagnetic wave leakage analysis

Transient electromagnetic interference in substations

Analysis of Discharge Faults Between Flanges Caused by Transient Enclosure Voltage

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