Analysis of Suspended Potential Discharge Defects by SF6 Decomposition Products

Abstract The type and content of SF6 decomposition products are directly related to the type, location and degree of fault. Based on the analysis of the abnormal SF6 gas decomposition product content and discharge type of 126kV Porcelain Column type circuit breaker, the potential fault of the circuit breaker is judged to be suspension potential discharge fault. After disassembling the circuit breaker, it is found that the abnormal phase of the insulation rod is deformed, the pin become thin, and there are solid decomposition products, the sulfides and fluoride, which are mainly composed of iron, aluminum, chromium and manganese, further confirm that the potential fault of the circuit breaker is suspension potential discharge fault. The forming process and reaction mechanism of the suspended potential discharge fault are analyzed. Once the fault occurs, its function will promote the development of the fault. The influence of the suspension potential discharge fault on the performance of the circuit breaker is also analyzed. When the suspension potential discharge fault exists, it will cause the abnormality and even affect the normal operation of the circuit breake.

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Condition Assessment on Arc Nozzle of High Voltage Circuit Breaker Through SF6 Decomposition Products

2019 IEEE 8th International Conference on Advanced Power System Automation and Protection (APAP) ◽

10.1109/apap47170.2019.9224671 ◽

2019 ◽

Author(s):

Xu Yang ◽

Changhong Zhang ◽

Weiguo Li ◽

Zhongkang Huang ◽

Jinwei Chu ◽

...

Keyword(s):

High Voltage ◽

Circuit Breaker ◽

Condition Assessment ◽

Decomposition Products ◽

High Voltage Circuit Breaker ◽

Sf6 Decomposition

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Recognition of Protrusion Defect Fault in Gas Insulated Switchgear Base on SF6 Decomposition Product

International Journal of Advanced Research in Computer Science and Software Engineering ◽

10.23956/ijarcsse.v8i1.545 ◽

2018 ◽

Vol 8 (1) ◽

pp. 131

Author(s):

Visa Musa Ibrahim

Keyword(s):

Preventive Maintenance ◽

Decomposition Product ◽

Partial Discharge ◽

Sulphur Hexafluoride ◽

Decomposition Products ◽

Gas Insulated Switchgear ◽

Product Method ◽

Ftir Spectrometer ◽

Sf6 Decomposition ◽

The Impact

A solid analytic procedure of Gas insulated switchgear condition checking is utilized in this studies as a part of exploration for the detection of sulphur hexafluoride gas (SF6) decomposition by-product because of its high affectability, reliability and anti-electromagnetic obstruction. This is known as chemical decomposition by-product method. A simulated coaxial deterioration chamber was designed and used on the high voltage electrode to re-enact the decomposition of SF6 under the impact of protrusion defect that generates partial discharge in the coaxial chamber at a pressure of 0.2MPa.The chamber is energised at 50kv for the period of 50 hours and the generated partial discharge simulate the decomposition of SF6 gas. The deterioration decomposition products SO2, SOF2, SO2F2, SO2F10, SiF4, CO, C3F8, C2F6 were detected offline by FTIR spectrometer. These deteriorated items and its concentration can be utilized to recognize and distinguish the type and the magnitude of fault in gas insulated switchgear (protrusion fault) before failure occur for the aim of preventive maintenance.

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TiO2 Nanotube Array Sensor for Detecting the SF6 Decomposition Product SO2

Sensors ◽

10.3390/s120303302 ◽

2012 ◽

Vol 12 (3) ◽

pp. 3302-3313 ◽

Cited By ~ 80

Author(s):

Xiaoxing Zhang ◽

Jinbin Zhang ◽

Yichao Jia ◽

Peng Xiao ◽

Ju Tang

Keyword(s):

Decomposition Product ◽

Tio2 Nanotube ◽

Tio2 Nanotube Array ◽

Nanotube Array ◽

Array Sensor ◽

Sf6 Decomposition

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Detection of SO2F2 concentration of SF6 decomposition product in GIS gas chamber based on ICL-TDLAS

10.1117/12.2601827 ◽

2021 ◽

Author(s):

Qiang Yao ◽

Xianglian Yan ◽

Shukai He ◽

Rubin Qi ◽

Xintian Li ◽

...

Keyword(s):

Decomposition Product ◽

Sf6 Decomposition ◽

Gas Chamber

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Mono- and Bi-Molecular Adsorption of SF6 Decomposition Products on Pt Doped Graphene: A First-Principles Investigation

Applied Sciences ◽

10.3390/app8102010 ◽

2018 ◽

Vol 8 (10) ◽

pp. 2010 ◽

Cited By ~ 2

Author(s):

Yongqian Wu ◽

Shaojian Song ◽

Dachang Chen ◽

Xiaoxing Zhang

Keyword(s):

Single Molecule ◽

First Principles ◽

Density Functional ◽

Energy Gap ◽

Adsorption Parameters ◽

Functional Theory ◽

Decomposition Products ◽

Before And After ◽

Doped Graphene ◽

Sf6 Decomposition

Based on the first-principles of density functional theory, the SF6 decomposition products including single molecule (SO2F2, SOF2, SO2), double homogenous molecules (2SO2F2, 2SOF2, 2SO2) and double hetero molecules (SO2 and SOF2, SO2 and SO2F2, SOF2 and SO2F2) adsorbed on Pt doped graphene were discussed. The adsorption parameters, electron transfer, electronic properties and energy gap was investigated. The adsorption of SO2, SOF2 and SO2F2 on the surface of Pt-doped graphene was a strong chemisorption process. The intensity of chemical interactions between the molecule and the Pt-graphene for the above three molecules was SO2F2 > SOF2 > SO2. The change of energy gap was also studied and according to the value of energy gap, the conductivity of Pt-graphene before and after adsorbing different gas molecules can be evaluated.

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First-Principle Study of Rh-Doped Nitrogen Vacancy Boron Nitride Monolayer for Scavenging and Detecting SF6 Decomposition Products

Polymers ◽

10.3390/polym13203507 ◽

2021 ◽

Vol 13 (20) ◽

pp. 3507

Author(s):

Zhen Shi ◽

Sheng-Yuan Xia

Keyword(s):

Boron Nitride ◽

Sulfur Hexafluoride ◽

Nitrogen Vacancy ◽

First Principle ◽

Density Of State ◽

Decomposition Products ◽

Status Assessment ◽

Sf6 Decomposition ◽

Computational Processes ◽

Potential Use

The scavenging and detection of sulfur hexafluoride (SF6) decomposition products (SO2, H2S, SO2F2, SOF2) critically matters to the stable and safe operation of gas-insulated switchgear (GIS) equipment. In this paper, the Rh-doped nitrogen vacancy boron nitride monolayer (Rh-VNBN) is proposed as a gas scavenger and sensor for the above products. The computational processes are applied to investigate the configurations, adsorption and sensing processes, and electronic properties in the gas/Rh-VNBN systems based on the first-principle calculations. The binding energy (Eb) of the Rh-VNBN reaches −8.437 eV, while the adsorption energy (Ead) and band gap (BG) indicate that Rh-VNBN exhibits outstanding adsorption and sensing capabilities. The density of state (DOS) analysis further explains the mechanisms of adsorption and sensing, demonstrating the potential use of Rh-VNBN in sensors and scavengers of SF6 decomposition products. This study is meaningful as it explores new gas scavengers and sensors of SF6 decomposition products to allow the operational status assessment of GIS equipment.

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Development of Gas Sensors for Detecting SF6 Decomposition Products and Locating Faults in GIS

IEEJ Transactions on Sensors and Micromachines ◽

10.1541/ieejsmas.117.526 ◽

1997 ◽

Vol 117 (10) ◽

pp. 526-531 ◽

Cited By ~ 2

Author(s):

Shigemitsu Okabe ◽

Takahiro Ohno ◽

Shiro Yamauchi ◽

Tadao Minagawa ◽

Mitsuhito Kamei ◽

...

Keyword(s):

Gas Sensors ◽

Decomposition Products ◽

Sf6 Decomposition

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Explosive Thermal Decomposition Mechanism of NTO

MRS Proceedings ◽

10.1557/proc-418-379 ◽

1995 ◽

Vol 418 ◽

Cited By ~ 5

Author(s):

David J. Beardall ◽

Tod R. Botcher ◽

Charles A. Wight

Keyword(s):

Thin Films ◽

Thermal Decomposition ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Condensed Phase ◽

Decomposition Product ◽

Rapid Heating ◽

Initial Step ◽

Thermal Decomposition Mechanism ◽

Decomposition Products

AbstractThe initial step of the thermal decomposition of NTO (5-nitro-2,4-dihydro-3H-1,2,4- triazol-3-one) is determined by pulsed infrared laser pyrolysis of thin films. Rapid heating of the film and quenching to 77 K allows one to trap the initial decomposition products in the condensed phase and analyze them using transmission Fourier-transform infrared spectroscopy. The initial decomposition product is CO2; NO2 and HONO are not observed. We propose a new mechanism for NTO decomposition in which CO2 is formed.

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Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Energies ◽

10.3390/en12132512 ◽

2019 ◽

Vol 12 (13) ◽

pp. 2512 ◽

Cited By ~ 1

Author(s):

Xiao Yu ◽

Fan Yang ◽

Xing Li ◽

Shaogui Ai ◽

Yongning Huang ◽

...

Keyword(s):

Electric Field ◽

Circuit Simulation ◽

Short Circuit ◽

Circuit Breaker ◽

Normal Operation ◽

Parallel Structure ◽

Voltage Distribution ◽

Fem Model ◽

Vacuum Circuit Breaker ◽

A Minor

A balanced voltage distribution for each break is required for normal operation of a multi-break vacuum circuit breaker (VCB) This paper presented a novel 363 kV/5000 A/63 kA sextuple-break VCB with a series-parallel structure. To determine the static voltage distribution of each break, a 3D finite element method (FEM) model was established to calculate the voltage distribution and the electric field of each break at the fully open state. Our results showed that the applied voltage was unevenly distributed at each break, and that the first break shared the most voltage, about 86.3%. The maximum electric field of the first break was 18.9 kV/mm, which contributed to the reduction of the breaking capacity. The distributed and stray capacitance parameters of the proposed structure were calculated based on the FEM model. According to the distributed capacitance parameters, the equivalent circuit simulation model of the static voltage distribution of this 363 kV VCB was established in PSCAD. Subsequently, the influence of the grading capacitor on the voltage distribution of each break was investigated, and the best value of the grading capacitors for the 363 kV sextuple-break VCB was confirmed to be 10 nF. Finally, the breaking tests of a single-phase unit was conducted both in a minor loop and a major loop. The 363 kV VCB prototype broke both the 63 kA and the 80 kA short circuit currents successfully, which confirmed the validity of the voltage sharing design.

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