Influence of Metallic Materials on SF6 Decomposition Components under Positive DC Partial Discharge

Tang, Ju; Cao, Zhengqin; Zeng, Fuping; Yao, Qiang; Miao, Yanwei; Qiu, Ni

doi:10.1007/s11090-017-9841-7

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…In our previous researches, it is found that the concentration of SF 6 decomposition component induced by coronas changed with time after the voltage application [24][25][26]. This behaviour may lead to the evolution of discharge characteristics with time according to the analysis about the formation of pulse burst occurring in coronas, and further affect the discharge magnitude distribution.…”

Section: Effect Of Voltage Duration Time On Discharge Magnitude Distrmentioning

confidence: 95%

Relationship between PD magnitude distribution and pulse burst for positive coronas

Tang

Luo

Pan

2018

IET Science, Measurement & Technology

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Section: Effect Of Voltage Duration Time On Discharge Magnitude Distrmentioning

confidence: 95%

Relationship between PD magnitude distribution and pulse burst for positive coronas

Tang

Luo

Pan

2018

IET Science, Measurement & Technology

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“…In Formula (17), (18), and (19), m is the electronic mass, K is the Boltzmann constant, T is the temperature, h is the Planck constant,h = h/2π , and…”

Section: Computational Study and Theoretical Analysis Of The Effecmentioning

confidence: 99%

“…Belmadan et al [15], Vijh [16], and Hirooka et al [17] studied the influence of metal materials on SF 6 decomposition under arc and found that the generation rate of metal fluoride is proportional to the electrode potential of metal, and metal plays a catalytic role. Tang et al [19] studied the influence of metal materials on SF 6 decomposition under corona discharge and specified that the types of metal materials affect the decomposition characteristics of sulfur-containing decomposition gases, such as S 2 F 10 , SOF 2 , and SO 2 F 2 ; however, almost no correlation was observed with carbon-containing decomposition characteristic gases, such as CF 4 . Tang et al [19], [20] studied the influence of metal materials on SF 6 under positive DC PD; the difference in surface passivation film and metal halogenation resistance among metal materials resulted in different SF 6 decomposition characteristics.…”

mentioning

confidence: 99%

“…Tang et al [19] studied the influence of metal materials on SF 6 decomposition under corona discharge and specified that the types of metal materials affect the decomposition characteristics of sulfur-containing decomposition gases, such as S 2 F 10 , SOF 2 , and SO 2 F 2 ; however, almost no correlation was observed with carbon-containing decomposition characteristic gases, such as CF 4 . Tang et al [19], [20] studied the influence of metal materials on SF 6 under positive DC PD; the difference in surface passivation film and metal halogenation resistance among metal materials resulted in different SF 6 decomposition characteristics. Little study on the effect of metal materials on the SF 6 decomposition characteristics under negative DC PD is currently available, but most unipolar HVDC transmissions use negative DC.…”

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confidence: 99%

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An Investigation of Negative DC Partial Discharge Decomposition of SF₆ Under Different Metal Materials

et al. 2020

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For determine the influence of metal materials on the negative DC partial discharge (PD) decomposition of SF 6 and put forward for the method of SF 6 DC gas insulated equipment condition monitoring and fault diagnosis based on decomposed component analysis, this study investigates the decomposition characteristics of SF 6 under three common metal materials (Al, 304 stainless steel, and Cu) in gas insulated equipment by using SO 2 , SOF 2 , and SO 2 F 2 as characteristic component gases under negative DC PD. Results show that the types of metal materials have substantial effects on the negative DC PD decomposition characteristics of SF 6. The simulation results based on the first principles confirm the phenomena observed in the experiment: the amounts and generation rates of SOF 2 were the most abundant, followed by SO 2 F 2 and SO 2. The calculation based on free electron cloud and finite depth particle in a box model shows that the electron current density of field emission has the relationship with metal work function γ and electrical field E: j(0, E) ≈ (BE 2 /γ) exp(−Dγ 3/2 /E), where B and D is constants. The electron current density by field emission is inversely proportional to the work function of metal with constant electric field. The metal material with smaller work function means the greater electron current density, further promoting the decomposition of SF 6 to generate more characteristic component gases. The results can well explain the phenomena observed in the experiment, that is, the decomposition of SF 6 is the most serious under Al electrode with lowest work function, followed by 304 stainless steel, and Cu. INDEX TERMS Negative DC, metal materials, SF 6 , first principle, work function. I. INTRODUCTION With the development and trial operation of key ultra-high voltage DC (UHVDC) gas-insulated equipment, such as ± 800 and ± 1100 kV gas DC wall bushings [1]-[3], SF 6 DC gas-insulated equipment has been widely used in UHVDC power transmission projects [4], [6]. DC gas-insulated equipment has great advantages, such as simple and compact structure, light weight, and good heat dissipation [7]. However, harmful metal protrusion defects are inevitably observed in the production, transportation, installation, and operation of The associate editor coordinating the review of this manuscript and approving it for publication was Jenny Mahoney.

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“…SF 6 -gas-insulated equipment is extensively applied in power electrical systems because of its high reliability, compact construction, and small land occupation [1]- [5]. However, under partial discharge (PD), SF 6 gas generates SOF 2 , SO 2 F 2 , H 2 S, and other toxic substances with a small amount of impurity gases, such as moisture and oxygen [6]- [9], which corrode and reduce the insulation of gas-insulated equipment [10]. To eliminate this effect, using special adsorbent to absorb moisture and various toxic SF 6 decomposition products in the gas chambers of SF 6 -insulated equipment can maintain the dryness and purity of SF 6 and ensure the insulation strength of SF 6 [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Research on Environmental Protection Treatment for Ex-Service SF₆ Adsorbent

Gang

Bai

et al. 2020

IEEE Access

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SF 6 adsorbents absorb many toxic SF 6 decomposition products, such as SOF 2 , SO 2 F 2 , and H 2 S. Ex-service SF 6 adsorbents that did not undergo environmentally friendly processing will seriously harm the environment. In this work, thermogravimetric analysis and Fourier transform infrared spectroscopy were used to investigate the adsorbates of ex-service SF 6 adsorbents. Adsorbent recycling based on the thermal method was also studied. The vacuum thermal method increased the recycling efficiency of ex-service SF 6 adsorbents to 85%-90%. In addition, the adsorbents recovered through thermal method could be reused in SF 6-gas-insulated equipment. Considering their influence on equipment operation and maintenance, a harmless treatment technology for ex-service SF 6 adsorbents with Ca(OH) 2 was proposed. The adsorption and desorption behaviors of SF 6 adsorbents were predicted via destiny functional theory. The best treatment effect could be obtained when the Ca(OH) 2 amount was equal to 20% of the treatment weight of the adsorbents, and the treatment temperature was maintained at 90 • C. The economic feasibility of the harmless treatment for ex-service SF 6 adsorbents with Ca(OH) 2 was higher than that of the thermal method. INDEX TERMS SF 6 adsorbent, Fourier transform infrared spectroscopy, harmless treatment. II. ANALYSIS OF THE ADSORPTION COMPONENTS OF EX-SERVICE SF 6 ADSORBENTS A. EXPERIMENTAL OBJECT

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Influence of Metallic Materials on SF6 Decomposition Components under Positive DC Partial Discharge

Cited by 9 publications

References 12 publications

Relationship between PD magnitude distribution and pulse burst for positive coronas

Relationship between PD magnitude distribution and pulse burst for positive coronas

An Investigation of Negative DC Partial Discharge Decomposition of SF₆ Under Different Metal Materials

Research on Environmental Protection Treatment for Ex-Service SF₆ Adsorbent

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Influence of Metallic Materials on SF6 Decomposition Components under Positive DC Partial Discharge

Cited by 9 publications

References 12 publications

Relationship between PD magnitude distribution and pulse burst for positive coronas

Relationship between PD magnitude distribution and pulse burst for positive coronas

An Investigation of Negative DC Partial Discharge Decomposition of SF6 Under Different Metal Materials

Research on Environmental Protection Treatment for Ex-Service SF6 Adsorbent

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Product

Resources

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An Investigation of Negative DC Partial Discharge Decomposition of SF₆ Under Different Metal Materials

Research on Environmental Protection Treatment for Ex-Service SF₆ Adsorbent