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Spacer flashover in Gas Insulated Switchgear (GIS) with humid SF6 under different electrical stresses. / Purnomoadi, A.P.; Mor, A. Rodrigo; Smit, J.J.

In: International Journal of Electrical Power & Energy Systems, Vol. 116, 2019, p. 105559.

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@article{30039fd931f4421e9d6723869fee74c8,
title = "Spacer flashover in Gas Insulated Switchgear (GIS) with humid SF6 under different electrical stresses",
abstract = "Humid insulating gas (SF6) has been observed in a case study of 631 CB-bays of Gas Insulated Switchgear (GIS) operating under tropical conditions. The routine gas quality check in the case study reported that 20{\%} of the non-Circuit Breaker enclosures have humidity above the value recommended by the IEEE and IEC standards. Therefore, an investigation into the flashover characteristics of a spacer in humid SF6 has been initiated in the High Voltage Laboratory of TU Delft, The Netherlands. The setup is a small model resembling the insulation system of a GIS with controlled parameters of humidity content and gas pressure. The electrical stresses in the test are AC, LI+, LI−, and SI with homogeneous, quasi-homogeneous-, and inhomogeneous field configurations. In general, the humidity does not influence the withstand strength of the spacer as long there is no condensation. When condensation occurred, the flashover voltage dropped by 28{\%} during the test under AC at 2.6 bars, and by 38{\%} during the test under LI+ at 2.5 bars; both with quasi-homogeneous field configuration. In the test with homogeneous field setup, the flashover voltage was dropped by 67{\%} under LI+ at 3.4 bars. In our setup, it has also been observed that the flashover-drop due to condensation is higher than due to a 2-mm aluminum particle attached to the sample close to the high electric field region simulating the inhomogeneous field configuration.",
keywords = "Gas insulated switchgear, Gas insulated substation, GIS, Tropical conditions, Humid insulting gas, Spacer flashover, SF6",
author = "A.P. Purnomoadi and Mor, {A. Rodrigo} and J.J. Smit",
year = "2019",
doi = "10.1016/j.ijepes.2019.105559",
language = "English",
volume = "116",
pages = "105559",
journal = "International Journal of Electrical Power & Energy Systems",
issn = "0142-0615",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Spacer flashover in Gas Insulated Switchgear (GIS) with humid SF6 under different electrical stresses

AU - Purnomoadi, A.P.

AU - Mor, A. Rodrigo

AU - Smit, J.J.

PY - 2019

Y1 - 2019

N2 - Humid insulating gas (SF6) has been observed in a case study of 631 CB-bays of Gas Insulated Switchgear (GIS) operating under tropical conditions. The routine gas quality check in the case study reported that 20% of the non-Circuit Breaker enclosures have humidity above the value recommended by the IEEE and IEC standards. Therefore, an investigation into the flashover characteristics of a spacer in humid SF6 has been initiated in the High Voltage Laboratory of TU Delft, The Netherlands. The setup is a small model resembling the insulation system of a GIS with controlled parameters of humidity content and gas pressure. The electrical stresses in the test are AC, LI+, LI−, and SI with homogeneous, quasi-homogeneous-, and inhomogeneous field configurations. In general, the humidity does not influence the withstand strength of the spacer as long there is no condensation. When condensation occurred, the flashover voltage dropped by 28% during the test under AC at 2.6 bars, and by 38% during the test under LI+ at 2.5 bars; both with quasi-homogeneous field configuration. In the test with homogeneous field setup, the flashover voltage was dropped by 67% under LI+ at 3.4 bars. In our setup, it has also been observed that the flashover-drop due to condensation is higher than due to a 2-mm aluminum particle attached to the sample close to the high electric field region simulating the inhomogeneous field configuration.

AB - Humid insulating gas (SF6) has been observed in a case study of 631 CB-bays of Gas Insulated Switchgear (GIS) operating under tropical conditions. The routine gas quality check in the case study reported that 20% of the non-Circuit Breaker enclosures have humidity above the value recommended by the IEEE and IEC standards. Therefore, an investigation into the flashover characteristics of a spacer in humid SF6 has been initiated in the High Voltage Laboratory of TU Delft, The Netherlands. The setup is a small model resembling the insulation system of a GIS with controlled parameters of humidity content and gas pressure. The electrical stresses in the test are AC, LI+, LI−, and SI with homogeneous, quasi-homogeneous-, and inhomogeneous field configurations. In general, the humidity does not influence the withstand strength of the spacer as long there is no condensation. When condensation occurred, the flashover voltage dropped by 28% during the test under AC at 2.6 bars, and by 38% during the test under LI+ at 2.5 bars; both with quasi-homogeneous field configuration. In the test with homogeneous field setup, the flashover voltage was dropped by 67% under LI+ at 3.4 bars. In our setup, it has also been observed that the flashover-drop due to condensation is higher than due to a 2-mm aluminum particle attached to the sample close to the high electric field region simulating the inhomogeneous field configuration.

KW - Gas insulated switchgear

KW - Gas insulated substation

KW - GIS

KW - Tropical conditions

KW - Humid insulting gas

KW - Spacer flashover

KW - SF6

U2 - 10.1016/j.ijepes.2019.105559

DO - 10.1016/j.ijepes.2019.105559

M3 - Article

VL - 116

SP - 105559

JO - International Journal of Electrical Power & Energy Systems

T2 - International Journal of Electrical Power & Energy Systems

JF - International Journal of Electrical Power & Energy Systems

SN - 0142-0615

ER -

ID: 57242827