Detection of intense partial discharge of epoxy insulation in sf6 insulated equipment using carbonyl sulfide

Zhou, Wenjun; Zheng, Yu; Yang, Shuai; Li, Han; Wang, Baoshan; Qiao, Shengya

doi:10.1109/tdei.2016.7736856

Cited by 20 publications

(11 citation statements)

References 11 publications

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“…Numerous studies have indicated that SF 6 decomposes under PD through a series of chemical reactions by which the low-fluorinated sulfur species react with metal vapor, trace H 2 O, and O 2 . The reaction products include SO 2 F 2 , SOF 2 , CF 4 , SO 2 , SOF 4 , HF, CS 2 , and SF 4 [25]- [27]. However, HF is a corrosive acid that can react with metal and organic solid insulating materials.…”

Section: Influence Of Metal Materials On the Pd Decomposition Of mentioning

confidence: 99%

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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Section: Influence Of Metal Materials On the Pd Decomposition Of mentioning

confidence: 99%

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

et al. 2020

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“…Under the effect of the electric field, the charged particles hit the surface of the stainless-steel electrodes and aluminum balls to release the C atoms, as well as hit the SF 6 molecules and break six S-F bonds to generate F atoms; both processes require high-energy collision ionization. By calculation [50], the energy of the charged particle is low when the voltage U ≤ 36 kV [26,27]. Therefore, when the voltage U ≤ 36 kV, only a small amount of C atoms and F atoms are generated from the collision ionization, and the CF 4 concentration increases slowly with time ( Figure 8a).…”

Section: Formation Characteristics Of Carbon-containing Componentsmentioning

confidence: 99%

Using SF6 Decomposed Component Analysis for the Diagnosis of Partial Discharge Severity Initiated by Free Metal Particle Defect

Tang

Yang

et al. 2017

Energies

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Abstract:The decomposition characteristics of a SF 6 gas-insulated medium were used to diagnose the partial discharge (PD) severity in DC gas-insulated equipment (DC-GIE). First, the PD characteristics of the whole process were studied from the initial PD to the breakdown initiated by a free metal particle defect. The average discharge magnitude in a second was used to characterize the PD severity and the PD was divided into three levels: mild PD, medium PD, and dangerous PD. Second, two kinds of voltage in each of the above PD levels were selected for the decomposition experiments of SF 6 . Results show that the negative DC-PD in these six experiments decomposes the SF 6 gas and generates five stable decomposed components, namely, CF 4 , CO 2 , SO 2 F 2 , SOF 2 , and SO 2 . The concentrations and concentration ratios of the SF 6 decomposed components can be associated with the PD severity. A minimum-redundancy-maximum-relevance (mRMR)-based feature selection algorithm was used to sort the concentrations and concentration ratios of the SF 6 decomposed components. Back propagation neural network (BPNN) and support vector machine (SVM) algorithms were used to diagnose the PD severity. The use of C(CO 2 )/CT 1 , C(CF 4 )/C(SO 2 ), C(CO 2 )/C(SOF 2 ), and C(CF 4 )/C(CO 2 ) shows good performance in diagnosing PD severity. This finding serves as a foundation in using the SF 6 decomposed component analysis (DCA) method to diagnose the insulation faults in DC-GIE and assess its insulation status.

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“…Indeed, when a discharge occurs, there is a chemical change in the material due to hot electrons in the avalanche which can decompose the surrounding materials into different chemical components. Thus, a gas analyzer could be exploited to detect its presence (Yaacobi et al, 2014;Zhou et al, 2016). Optical methods are used as well since the light emitted due to ED/PD is generally in the UV-visible range.…”

Section: Partial Discharge Detection Overviewmentioning

confidence: 99%

Magnetic-field CMOS microsensor for low-energy electric discharge detection

Said¹,

Tounsi²,

Rufer³

et al. 2018

J. Sens. Sens. Syst.

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Abstract. This paper addresses the development and characterization of a non-intrusive silicon-based microsensor, which can detect electric partial discharges in electrical insulation equipment. Early partial discharge detection prevents failures and can be used to optimize maintenance operations. Despite the potential that CMOS technology offers, miniaturized electric discharge detector has neither been investigated nor implemented, until now. The developed microsensor demonstrates its ability to record electric discharge emission thanks to the presence of a miniaturized planar inductor. The squared inductor of 50 turns with a side length of 1.5 mm used in our sensor has been fabricated on top of a silicon substrate in a CMOS technology. The total inductor wire length of loop antenna is 30 cm to achieve 100 MHz bandwidth. Using the microsensor at 1 cm from the discharge site, a damped sinusoidal induced voltage with an amplitude of 2 V has been measured at its output. We observed that the output signal spectrum is highly concentrated around a central resonance frequency, which remains constant. The main advantage of such design resides in its monolithic integration added to the high autonomy, which improves the microsensor efficiency.

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Detection of intense partial discharge of epoxy insulation in sf6 insulated equipment using carbonyl sulfide

Cited by 20 publications

References 11 publications

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

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

Using SF6 Decomposed Component Analysis for the Diagnosis of Partial Discharge Severity Initiated by Free Metal Particle Defect

Magnetic-field CMOS microsensor for low-energy electric discharge detection

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Detection of intense partial discharge of epoxy insulation in sf6 insulated equipment using carbonyl sulfide

Cited by 20 publications

References 11 publications

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

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

Using SF6 Decomposed Component Analysis for the Diagnosis of Partial Discharge Severity Initiated by Free Metal Particle Defect

Magnetic-field CMOS microsensor for low-energy electric discharge detection

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Product

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

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