Partial discharge detection of free moving particles in GIS by the UHF method: recognition pattern depending on the particle movement and location

Irwin, T.; Lopez-Roldan, J.; Charlson, C.

doi:10.1109/pesw.2000.847683

Cited by 12 publications

(3 citation statements)

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“…Figure 14b seems to show that particle contamination appears to exacerbate the electric field concentration in the region identified in the clean system in Figure 14a and also shows that there were PD events further along the whole length of the central gas insulated line. The observed PD is consistent with the expected behaviour of free metallic particles in GIL free motion, where particles bounce on the outer enclosure of a section [31] when measurements are made using UHF sensors. Figure 14b,c can be used to analyse the differences between the UHF and HFCT sensors; for the example shown, 85 kV is applied on the central conductor insulated by 3 bar CO 2 and both UHF and HFCT sensors are used to measure the same events.…”

Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 82%

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A Comparison of Partial Discharge Sensors for Natural Gas Insulated High Voltage Equipment

Widger

Carr

Hills

et al. 2020

Sensors

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The research in this paper consists of practical experimentation on a gas insulated section of high voltage equipment filled with carbon dioxide and technical air as a direct replacement to sulphur hexafluoride (SF6) and analyses the results of PD measurement by way of internal UHF sensors and external HFCTs. The results contribute to ongoing efforts to replace the global warming gas SF6 with an alternative such as pure carbon dioxide or technical air and are applicable to mixtures of electronegative gases that have a high content of buffer gas including carbon dioxide. The experiments undertaken involved filling a full-scale gas insulated line demonstrator with different pressures of CO2 or technical air and applying voltages up to 242 kV in both clean conditions and particle contaminated conditions. The results show that carbon dioxide and technical air can insulate a gas section normally insulated with SF6 at phase-to-earth voltage of 242 kV and that both HFCT and UHF sensors can be used to detect partial discharge with natural gases. The internal UHF sensors show the most accurate PD location results but external HFCTs offer a good compromise and very similar location accuracy.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 82%

A Comparison of Partial Discharge Sensors for Natural Gas Insulated High Voltage Equipment

Widger

Carr

Hills

et al. 2020

Sensors

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show abstract

“…At the peak of the AC wave, the electric field is highest, so free particles will gain the highest charge which proportional to the value of voltage at that point and so the PD pattern shape will form an envelope inside the AC wave, as shown in [19]. The observed PD patterns shown in Figure 9 are consistent with the expected behaviour of free metallic particles in SF6 insulated GIL free motion, where particles bounce on the outer enclosure of a section [20]. Bouncing particles on the enclosure do not form an AC wave envelope as a particle does during liftoff but rather PD across all phase angles, which is similar to those seen in the findings in this paper.…”

Section: Uhf Partial Discharge Measurement-clean and Particle-contaminated Systemsupporting

confidence: 68%

Partial Discharge Measurements in a High Voltage Gas Insulated Transmission Line Insulated with CO2

et al. 2020

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This paper uses practical experimentation to analyse the effect of replacing SF6 with pure CO2 in conventional gas insulated transmission line sections by studying partial discharge measurements taken with applied voltages up to 242 kV (rms). The results can also help in understanding the properties of new alternative gas mixtures which can be utilised with a ratio of up to and over 95% CO2. The experiments undertaken involved filling a gas insulated line demonstrator with 3 bars of CO2 and applying voltages up to 242 kV in both clean conditions and particle-contaminated enclosure conditions. The results demonstrate that CO2 can be used to insulate gas equipment without breakdown at high voltage, however, a higher gas-filling pressure may be needed to reduce the partial discharge found in the tests presented in this paper. Another aspect of the work showed that partial discharge (PD) measurements from internal ultra-high frequency (UHF) sensors compared with a direct measurement from a capacitive divider both clearly showed the effect of contaminating particles in CO2. However, the PD divider measurements also showed considerable external PD on the outside of the gas compartment, leading to the conclusion that UHF sensors are still regarded as having the highest sensitivity and noise immunity for gas insulated switchgear (GIS) or gas insulated transmission line (GIL) systems including when the equipment is insulated with CO2.

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Recognition of partial discharge waveshape patterns for gas insulated switchgear

Lee

Chang

2005

Australian Journal of Electrical and Electronics Engineering

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Partial discharge detection of free moving particles in GIS by the UHF method: recognition pattern depending on the particle movement and location

Cited by 12 publications

References 0 publications

A Comparison of Partial Discharge Sensors for Natural Gas Insulated High Voltage Equipment

A Comparison of Partial Discharge Sensors for Natural Gas Insulated High Voltage Equipment

Partial Discharge Measurements in a High Voltage Gas Insulated Transmission Line Insulated with CO2

Recognition of partial discharge waveshape patterns for gas insulated switchgear

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