Thirty-Six Years of Service Experience with a National Population of Gas-Insulated Substations

Istad, Maren Kristine; Runde, M.

doi:10.1109/tpwrd.2010.2050705

Cited by 74 publications

(25 citation statements)

References 1 publication

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“…Service experience indicates that the main defects in real GIS in service include four typical ones, namely, metallic protrusion, free metallic particle, contamination on the surface of the spacer, and the gap at electrode/epoxy interface [1]. These four typical insulation defects are established for UHF and chemical detection.…”

Section: Joint Electro-chemical Detection Methodsmentioning

confidence: 99%

“…GIS offers advantages such as higher reliability, less maintenance, and more compact size. However, service experience also indicates incidents of GIS failure in recent years [1]. The operation of GIS equipment does not only affect its own stability of functioning but also has a direct impact on the power grid, causing economic losses to industry and inconvenience to people's daily life.…”

Section: Introductionmentioning

confidence: 99%

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Application of Joint Electro-Chemical Detection for Gas Insulated Switchgear Fault Diagnosis

Li¹,

Tang²,

Li³

2015

Journal of Electrical Engineering and Technology

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-The integrity of the gas insulated switchgear (GIS) is vital to the safety of an entire power grid. However, there are some limitations on the techniques of detecting and diagnosing partial discharge (PD) induced by insulation defects in GIS. This paper proposes a joint electro-chemical detection method to resolve the problems of incomplete PD data source and also investigates a new unique fault diagnosis method to enhance the reliability of data processing. By employing ultra-high frequency method for online monitoring and the chemical method for detecting SF6 decomposition offline, the acquired data can form a more complete interpretation of PD signals. By utilizing DS evidence theory, the diagnostic results with tests on the four typical defects show the validity of the new fault diagnosis system. With higher accuracy and lower computation cost, the present research provides a promising way to make a more accurate decision in practical application.

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Section: Joint Electro-chemical Detection Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Joint Electro-Chemical Detection for Gas Insulated Switchgear Fault Diagnosis

Li¹,

Tang²,

Li³

2015

Journal of Electrical Engineering and Technology

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“…The population of Norwegian gas-insulated substations (GIS) has been investigated by Istad and Runde [27]. It comprises 618 circuit breakers with about 12000 circuit-breaker years, with 180 failures during the 36 years that GIS have been installed in Norway.…”

Section: A Failure Statistics About Circuit Breakersmentioning

confidence: 99%

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Westerlund

Hilber

Lindquist

et al. 2014

2014 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

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Abstract-There is a need for a new survey of conditionmonitoring methods for circuit breakers and disconnectors, since during the last two decades less than ten surveys have been carried out. The paper presents several statistical surveys and analyses. The methods of condition monitoring found are reviewed and classified according to the different types of failure identified in the surveys. Some research gaps are identified, such as the prediction of the degradation of the contacts, the signal processing of coil and motor currents and the switching.

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“…However, under the effect of the partial discharge (PD), spark discharge, arc discharge, overheating, and other factors, SF 6 gas is decomposed into various low-fluoride sulfides (such as SF 5 , SF 4 , SF 3 , SF 2 , and SF). These low-fluoride sulfides then react with the trace air and moisture that inevitably exist in the DC-GIE to produce stable decomposition products, such as sulfuryl fluoride (SO 2 F 2 ), thionyl fluoride (SOF 2 ), thionyl tetrafluoride (SOF 4 ), sulfur dioxide (SO 2 ), carbon tetrafluoride (CF 4 ), carbon dioxide (CO 2 ), hydrogen fluoride (HF), and hydrogen sulfide (H 2 S) [7][8][9][10][11][12]. Some of these products, particularly SO 2 , HF, and H 2 S, can corrode metal parts and solid insulation in equipment, thereby accelerating insulation aging and reducing the overall insulation performance of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Decomposition Characteristics of SF6 and Partial Discharge Recognition under Negative DC Conditions

Tang

Yang

et al. 2017

Energies

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Four typical types of artificial defects are designed in conducting the decomposition experiments of SF 6 gas to obtain and understand the decomposition characteristics of SF 6 gas-insulated medium under different types of negative DC partial discharge (DC-PD), and use the obtained decomposition characteristics of SF 6 in diagnosing the type and severity of insulation fault in DC SF 6 gas-insulated equipment. Experimental results show that the negative DC partial discharges caused by the four defects decompose the SF 6 gas and generate five stable decomposed components, namely, CF 4 , CO 2 , SO 2 F 2 , SOF 2 , and SO 2 . The concentration, effective formation rate, and concentration ratio of SF 6 decomposed components can be associated with the PD types. Furthermore, back propagation neural network algorithm is used to recognize the PD types. The recognition results show that compared with the concentrations of SF 6 decomposed components, their concentration ratios are more suitable as the characteristic quantities for PD recognition, and using those concentration ratios in recognizing the PD types can obtain a good effect.

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Thirty-Six Years of Service Experience with a National Population of Gas-Insulated Substations

Cited by 74 publications

References 1 publication

Application of Joint Electro-Chemical Detection for Gas Insulated Switchgear Fault Diagnosis

Application of Joint Electro-Chemical Detection for Gas Insulated Switchgear Fault Diagnosis

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Decomposition Characteristics of SF6 and Partial Discharge Recognition under Negative DC Conditions

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