Measurement and analysis of partial discharges in SF 6 gas under HVDC

Wang, Guo‐Ming; Jo, Hyang-Eun; Kim, Sun–Jae; Kim, Sung-Wook; Kil, Gyung-Suk

doi:10.1016/j.measurement.2016.05.033

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…The electrode system and detection resistor were placed in a shielding room to reduce external interface. Signal acquisition was achieved by using a digital storage oscilloscope (DSO) with a samplingrate of 5 GS/s and NI PXI with a sampling rate of 250 MS/s [33,34].…”

Section: Experiments and Methodsmentioning

confidence: 99%

Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

Wang¹,

Shen²,

Liu³

et al. 2020

Journal of Electrical Engineering

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This paper dealt with characteristics of partial discharge (PD) initiated by metallic particles under DC voltage in green gas for grid (g3), which is an emerging and promising eco-friendly alternative insulation gas to SF6. Experimental setup was configured to simulate PD under DC in gas-insulated power facilities. Two types of particle, namely rectangle particle and sphere particle were used. The results indicated that the discharge inception voltages in g3 gas were 90.1-92.5% of that in SF6. In two particles, PD occurred with higher average apparent charge and discharge repetition rate in g3 compared with those in SF6 gas. The time-resolved partial discharge presented similar characteristics in g3 and SF6 gas. The time interval between two successive discharge pulses were 0.1 ms-10 ms and 5 ms-15 ms in the rectangle particle and sphere particle, respectively. Results from this paper are expected to provide fundamental material for the development of SF6 -free gas-insulated power apparatus.

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Section: Experiments and Methodsmentioning

confidence: 99%

Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

Wang¹,

Shen²,

Liu³

et al. 2020

Journal of Electrical Engineering

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“…A HVDC source was generated by a rectifier circuit that was composed of a dry-type transformer, a 100 kV diode, and a 0.5 µF capacitor. The transformer with a Artificial defects filled with SF6 gas were placed inside a shielding box to reduce the external interference [3,11]. The applied voltage was measured by a high-voltage capacitive divider (Div., North Star High Voltage, VD-100).…”

Section: Methodsmentioning

confidence: 99%

“…In addition, PD source can be localized using the absolute and relative time of arrival of acoustic emission or ultra-high frequency signal. However, owing to the absence of phase information and the different recurrence mechanism, PD analysis methods under direct current (DC) are totally different from those under AC, although the detection methods are the same [11][12][13]. The pulse repetition rate and frequency under DC are much lower than those under AC [14].…”

Section: Introductionmentioning

confidence: 99%

De-noising of partial discharge signal using wavelet transform for GIS under HVDC

Wang¹,

Hu²,

Tang³

et al. 2020

Journal of Electrical Engineering

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Detection and analysis of partial discharge (PD) have been regard as the most effective method for condition monitoring and asset management of gas-insulated structures (GIS) in the power system. However, PD detection sensitivity and accuracy are greatly influenced by on-site noise and interference, resulting in failures in PD severity assessment, defect identification or localization. Although de-noising of PD signal under AC was well studied, related investigations under DC have not been carried out. With the rapid development of HVDC technology, it is a new challenge to eliminate noise from PD signal under DC for diagnosis of related power facilities. Therefore, this paper dealt with the discrimination of PD signal based on wavelet transform (WT) techniques for HVDC GIS, aiming to improve the sensitivity and accuracy of insulation diagnosis. Experimental setup was configured to generate PD signal under DC and four types of artificial defects were fabricated to simulate typical insulation defects in GIS. The WT techniques were used to discriminate PD pulse sequences from background noise, amplitude modulation radio interference, non-sinusoidal noise, and switching impulse and the effectiveness was compared with a high-pass filter.

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“…It occurs at any point in the insulation system where the electric field strength exceeds the breakdown strength of gas. Therefore, PD is regarded as an early stage of breakdown [39][40][41]. PD characteristics, in terms of partial discharge inception voltage (PDIV), discharge magnitude, and pulse count as a function of gas pressure and insulation distance, are used to compare the insulation performance of alternative gases [42][43][44].…”

Section: Dielectric Strengthmentioning

confidence: 99%

Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review

Pan

Wang²,

Shi

et al. 2020

Applied Sciences

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This paper deals with a review of the state-of-the-art performance investigations of green gas for grid (g3) gas, which is an emerging eco-friendly alternative insulation gas for sulfur hexafluoride (SF6) that will be used in gas-insulated power facilities for reducing environmental concerns. The required physical and chemical properties of insulation gas for high-voltage applications are discussed, including dielectric strength, arc-quenching capability, heat dissipation, boiling point, vapor pressure, compatibility, and environmental and safety requirements. Current studies and results on AC, DC, and lightning impulse breakdown voltage, as well as the partial discharge of g3 gas, are provided, which indicate an equivalent dielectric strength of g3 gas with SF6 after a proper design change or an increase in gas pressure. The switching bus-transfer current test, temperature rise test, and liquefaction temperature calculation also verify the possibility of replacing SF6 with g3 gas. In addition, the use of g3 gas significantly reduces theabovementioned environmental concerns in terms of global warming potential and atmosphere lifetime. In recent years, g3 gas-insulated power facilities, including switchgear, transmission line, circuit breaker, and transformer, have been commercially available in the electric power industry.

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Measurement and analysis of partial discharges in SF 6 gas under HVDC

Cited by 25 publications

References 9 publications

Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

De-noising of partial discharge signal using wavelet transform for GIS under HVDC

Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review

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Measurement and analysis of partial discharges in SF 6 gas under HVDC

Cited by 25 publications

References 9 publications

Green gas for grid as an eco-friendly alternative insulation gas to SF6: From the perspective of PD initiated by metallic particles under DC

Green gas for grid as an eco-friendly alternative insulation gas to SF6: From the perspective of PD initiated by metallic particles under DC

De-noising of partial discharge signal using wavelet transform for GIS under HVDC

Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review

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Product

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Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC