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

AbstractThis 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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Partial Discharge Characteristics caused by Metallic Particles under DC voltage on Oil Immersed Insulation

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) ◽

10.1109/icdl.2019.8796590 ◽

2019 ◽

Author(s):

Yoshitaka Miyaji ◽

Soichiro Kainaga ◽

Manabu Yoshimura ◽

Hirotaka Muto ◽

Kenichi Suga

Keyword(s):

Partial Discharge ◽

Discharge Characteristics ◽

Dc Voltage ◽

Metallic Particles

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Influence of Insulating Material Properties on Partial Discharges at DC Voltage

Energies ◽

10.3390/en13174305 ◽

2020 ◽

Vol 13 (17) ◽

pp. 4305

Author(s):

Marek Florkowski

Keyword(s):

Material Properties ◽

Dielectric Material ◽

Partial Discharge ◽

Partial Discharges ◽

Time Interval ◽

Post Discharge ◽

Insulating Material ◽

Dc Voltage ◽

The Impact

Understanding a partial discharge mechanism at direct current (DC) is an actual research topic that requires both modeling, simulations and measurements. This paper describes an influence of insulating material properties on partial discharges at DC voltage. Modifications of the traditional model reflecting the conditions of partial discharges (PD) inception and post discharge processes at DC voltage have been proposed. The aim was to show the partial discharge mechanisms and draw attention to the role of parameters of insulation materials adjacent to the cavity at DC voltage. The investigations were performed on two kinds of dielectric material used in power cables. Various combinations of specimens were designed to reveal the effect of the material resistivity on the PD activity. Key observations referred to the impact of the void adjacent material resistance on the partial discharge inception voltage threshold at DC voltage. The modified PD model was applied to analyze both inception and post discharge recovery stage. The role of dielectric properties of material adjacent to the void was investigated, highlighting its impact during static inception stage and in charging stage. Despite many simplifications introduced in the model, measurement results have confirmed the role of the dielectric material surrounding the void on partial discharge dynamics. The average time interval between PD pulses revealed a systematic relationship with respect to the applied voltage and specimen resistivity. This value can be considered in the future research for diagnostic indicator at DC voltage.

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Numerical Simulation for DC PD in Void

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.448-453.1982 ◽

2013 ◽

Vol 448-453 ◽

pp. 1982-1987

Author(s):

Jin Zhong Li ◽

Shu Qi Zhang ◽

Rui Guo ◽

Hao Tang ◽

Tao Zhao ◽

...

Keyword(s):

Numerical Simulation ◽

Finite Difference ◽

Finite Difference Method ◽

Repetition Rate ◽

Electric Field Distribution ◽

Time Interval ◽

Stochastic Property ◽

Dc Voltage ◽

The Finite Difference Method ◽

The Relationship

A numerical simulation for DC PD in void is put forward based on the PD physical process. The finite difference method is used to calculate the electric field distribution, and both of the stochastic property and the accumulation of the charge after PD on the void surfaces are considering in the model. The time of PD occurring, the amount of discharge and the voltage across the void are calculated. Meanwhile, the relationship between the DC voltage and the PD time interval or repetition rate is also simulation, the results show that with the increase of the DC voltage, the PD interval corresponding decreases exponentially and the repetition rate increases exponentially.

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Experimental Challenges when Measuring Partial Discharges under Combined DC and High Frequency AC Voltage

Proceedings of the Nordic Insulation Symposium ◽

10.5324/nordis.v0i24.2290 ◽

2017 ◽

Cited By ~ 1

Author(s):

Pål Keim Olsen ◽

Ingrid Roen Velo ◽

Frank Mauseth

Keyword(s):

High Frequency ◽

Partial Discharge ◽

Partial Discharges ◽

Experimental Setup ◽

Faraday Cage ◽

Dc Voltage ◽

Low Pass ◽

High Frequency Ac ◽

Intermittent Noise ◽

Low Pass Filters

<p>The present paper reviews some of the challenges involved in designing and building an experimental setup for measurement of partial discharge under combined AC and DC voltage. A design of a modular test cell is discussed, as well as all parameters relevant to proper control of the experiment conditions. The described experimental setup is capable of producing sinusoidal AC voltage at a variable frequency up to 5 kHz superimposed a high DC voltage. The challenges related to intermittent noise reduction was remedied by placing the setup in a Faraday cage and controlling the setup from the outside by optical cables. All equipment in the test setup was connected to the power grid through low-pass filters.</p>

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