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Studies on the Effect of Accelerated Thermal Aging on Electrical and Physicochemical Properties of XLPE Cable
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作者 金天雄 金之俭 +3 位作者 江平开 朱子述 刘飞 金义天 《Journal of Shanghai Jiaotong university(Science)》 EI 2007年第1期91-95,共5页
The degradation of crosslinked polyethylene (XLPE) cable insulation during service, such as thermo-oxidation and water treeing may lead to a premature electrical breakdown of the XLPE insulation cables. Therefore, it ... The degradation of crosslinked polyethylene (XLPE) cable insulation during service, such as thermo-oxidation and water treeing may lead to a premature electrical breakdown of the XLPE insulation cables. Therefore, it is necessary to optimize the period of replacement to evenly distribute the replacement cost by ascertaining the deterioration degree. Estimation of the aging degree is at present the most important task for diagnosis of the residual lifetime of the power cable insulation. This paper presents a study on the changes in the dielectric properties of the thermally aged XLPE cables in the frequency range from 0.07~10 MHz. Based on electrical and physicochemical characterization, some new "dactylograms" for the thermally aged XLPE cable insulation have been proposed. 展开更多
关键词 electrical and physicochemical properties accelerated thermal aging crosslinked polyethylene xlpe cable insulation
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Aging Characteristics of XLPE Insulation of 110 kV Cables in the Initial Stage of Operation
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作者 Jie Chen Wei Zhang +4 位作者 Man Ding Libin Hu Jinpeng Wang Chenying Li Jingying Cao 《Energy Engineering》 EI 2021年第5期1537-1548,共12页
The aging characteristics of the XLPE insulation of 110 kV power cables in the initial stage of operation are studied in this paper.The XLPE insulation from cables with different running time was tested by using elect... The aging characteristics of the XLPE insulation of 110 kV power cables in the initial stage of operation are studied in this paper.The XLPE insulation from cables with different running time was tested by using electrical and physicochemical methods,from which the degradation state of XLPE under multiple stresses during operation was derived.The broadband dielectric spectrum test taken from 10–1 to 10^(6) Hz showed that the dielectric constant and dielectric loss of the XLPE insulation first decrease and then increase with the increase of cable running time,which show obvious variation until 10 years of operation.The AC breakdown strengths of the XLPE insulation of operated cables with the service year no longer than 10 years were higher than that of new cables.The mechanical properties of the XLPE insulation showed no dependence with the cable running time.The crystallinity and perfection of the crystallization area were found to be enhanced during operation and the polar functional groups inside the XLPE insulation were found to be determined not only by the cross-linking by-products but also by the oxidation process during cable operation.The experimental results in this paper are important for improving the operation reliability and reducing the maintenance costs of the cables. 展开更多
关键词 xlpe power cable AGING dielectric property aggregation structure
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Statistical Characteristics of Partial Discharge Caused by Typical Defects in Cable Joint under Oscillating Voltage
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作者 Guangmao Li Zuwei Luo +2 位作者 Jun Xiong Zucheng Huang Yajun Wang 《Journal of Energy and Power Engineering》 2015年第3期310-316,共7页
The oscillating voltage test is a nondestructive detection method for partial discharge of XLPE (cross linked polyethylene) cable and has been applied recently. This paper made three kinds of varying severity artifi... The oscillating voltage test is a nondestructive detection method for partial discharge of XLPE (cross linked polyethylene) cable and has been applied recently. This paper made three kinds of varying severity artificial defect models of cable joints in 10 kV XLPE cable. Oscillating voltage is applied to the model, by use of pulse current method to detect partial discharge signals. In order to study the statistical characteristics of partial discharge of cable joint under the oscillating voltage, three-dimensional statistical map has been made. The results show that for the same kind of defects, with the increases of the defect severity, the discharge interval extended, the magnitude and the number of partial discharge increase, for different kinds of defects, obvious differences exist among the maps, this may established a foundation for the further study of the partial discharge pattern recognition of XLPE cable under oscillating voltage. 展开更多
关键词 xlpe cable cable joint defect model partial discharge oscillating voltage three-dimensional statistical map.
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Line Differential Protection Scheme Modelling for Underground 420 kV Cable Systems
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作者 Michal Sztykiel Claus Leth Bak Sebastian Dollerup 《Journal of Energy and Power Engineering》 2012年第5期799-808,共10页
Based on the analysis of a specific relay model and an HVAC (high voltage alternating current) cable system, a detailed approach to EMTDC/PSCAD modelling of protective relays is presented. Such approach allows to cr... Based on the analysis of a specific relay model and an HVAC (high voltage alternating current) cable system, a detailed approach to EMTDC/PSCAD modelling of protective relays is presented. Such approach allows to create complex and accurate relay models derived from the original algorithms. Relay models can be applied with various systems, allowing to obtain the most optimal configuration of the protective relaying. The present paper describes modelling methodology on the basis of Siemens SIPROTEC 4 7SD522/610. Relay model was verified experimentally with its real equivalent by both EMTP-simulated and real world generated current signals connected to the relay. 展开更多
关键词 Line differential protection xlpe HVAC cable EMTDC/PSCAD relay model SIPROTEC 4 7SD522 7SD610.
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RECENT DEVELOPMENTS IN PHOTOINITIATED CROSSLINKING OF POLYETHYLENE AND ITS INDUSTRIAL APPLICATIONS 被引量:3
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作者 翟保钧 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2001年第2期189-207,共19页
The recent developments in the photoinitiated cross-linking of polyethylene and the significant breakthrough of its industrial application are reviewed. The enhanced photo-initiation system, the dynamics of photoiniti... The recent developments in the photoinitiated cross-linking of polyethylene and the significant breakthrough of its industrial application are reviewed. The enhanced photo-initiation system, the dynamics of photoinitiated crosslinking, the optimum conditions, the crystal morphological structures and related properties, and the photo- and thermo-oxidation stability of photocrosslinked polyethylene (XLPE) materials have been elucidated systematically. A new technique for producing photocrosslinked XLPE-insulated wire and cable is described in detail. It can be expected that the future applications of photocrosslinking technique of polyolefins will be very promising. 展开更多
关键词 POLYETHYLENE enhanced photocrosslinking systems morphological structures and properties photo- and thermooxidation stability photocrosslinked xlpe insulated wire and cable
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