Ageing Assessment of XLPE LV Cables for Nuclear Applications Through Physico-Chemical and Electrical Measurements

Suraci, Simone Vincenzo; Fabiani, Davide; Xu, Anne; Roland, Sébastien; Colin, Xavier

doi:10.1109/access.2020.2970833

Cited by 43 publications

(67 citation statements)

References 28 publications

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“…Also, the imaginary part of permittivity changed very little at 10 kHz while a decrease at 100 and 500 kHz was observed, Fig.12. These high frequencies, as reported in the literature [24], are related to the dipolar polarization of large species, such as oxidative products in the polymer matrix. The change in the real and imaginary part of permittivity at high frequencies shows that these large oxidative products have been inhibited to be generated due to the presence of anti-oxidants, having the responsibility of impeding the polymer degradation.…”

Section: A Dielectric Spectroscopysupporting

confidence: 66%

“…In these electrical methods, the researchers have aimed to study the effect of radiation stress on the insulation and jacket material separately, since the integrity of both components is critical to maintain the qualified conditions of cables [4,5]. Recently, most of the research has been focused on the LV shielded cables especially instrumentation and control (I&C) cables [24][25][26], since the measurement of electrical properties of insulation can be easily executed by the different connection of the test equipment to the shielding and conductors of tested cable. The on-site measurement capability and non-destructive nature of the dielectric measurement methods generate a need for the development of these methods to investigate unshielded cables, such as power cables.…”

Section: Introductionmentioning

confidence: 99%

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Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

2020

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In this paper, the effect of radiation stress on the overall degradation of jacket and insulation of low voltage unshielded power cable used in nuclear power plants is discussed. The XLPE insulated and CSPE jacketed cable samples were exposed to a total dose of 400 kGy γ-irradiation with 0.5 kGy/h dose-rate. Dielectric spectroscopy; complex permittivity, and extended voltage response; namely slopes of decay and return voltages were used to study the effect of the irradiation on the cable with an aim to establish the application of these techniques for a non-destructive condition monitoring of the unshielded cables. Shore D hardness was also used to investigate the mechanical characteristic of the cable. It was observed that the radiation stress affected the electrical and mechanical properties of the cable polymeric components i.e. insulation and jacket. The imaginary part of permittivity at low frequency; 100 Hz, the slope of return voltage, and hardness showed a significant increase with absorbed dose showing the effect of irradiation on the jacket and insulating material, as well. A strong correlation was observed between the imaginary part of permittivity at 100 Hz, slopes of return voltage, and hardness. The results show the dielectric measurement techniques are potential non-destructive condition monitoring methods for the unshielded low voltage nuclear power plant power cables for on-site diagnosis.

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Section: A Dielectric Spectroscopysupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

2020

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“…D. Fabiani studied XLPE cables aged under high temperature and different dose rates and evaluated the electrical properties of insulation. They found that the degradation of a polymer irradiated could saturate even though the higher irradiation was applied [9], [10].…”

Section: T W Dakin Evaluated the Aging State Of Insulating Materialmentioning

confidence: 99%

“…where H is the aging life of EPR, E is the activation energy of insulating materials, R is the molar gas constant, T is thermodynamic temperature, and B is the relevant constant. If y = lgH and x = 1/T , the above equation can be written as y = a + bx (10) According to the least square method, when the aging temperature is 100 • C, 120 • C and 135 • C, a and b can be calculated as follow…”

Section: Life Evaluation a Evaluation According To Aging Factor Amentioning

confidence: 99%

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

et al. 2020

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As important power cables for the mining mobile equipment, such as mining shearers, ethylene propylene rubber (EPR) cables often suffer from the combining effect of various stresses on site. In order to evaluate the aging state of EPR insulation, the paper carried out the multi-stress accelerated aging test on the insulation of coal mining flexible EPR cables. The infrared spectrum, elongation at break and polarization and depolarization current of cable insulation samples were measured. The insulation state of EPR cable was evaluated by using the aging factor obtained from isothermal relaxation current. Based on the failure standard of 50% elongation at break, the life formula of EPR insulation was deduced. The experimental and analytical results show that the tiny air gap was torn to the larger air gap under the mechanical stress, which leads to the increase of oxygen infiltration and promotes the thermo-oxygen reaction. The fracture energy of EPR decreases, and mechanical aging is accelerated. Aging factor and elongation at break can indicates the deterioration degree of EPR insulation. Based on the least square method and Arrhenius equation, the service life of the insulation of coal mining flexible EPR cables is deduced. INDEX TERMS Ethylene propylene rubber, cables, thermal aging, mechanical aging, life evaluation.

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“…The ageing condition of the power cables is always of concern to power industries [1]. If the assessment of the cable ageing conditions can be implemented nonintrusively, the outage caused by regular maintenance and even cable failure will be reduced greatly [2]- [3].…”

Section: Introductionmentioning

confidence: 99%

Transient Disturbances Based Non-Intrusive Ageing Condition Assessment for Cross-Bonded Cables

Yang

Luo

et al. 2020

IEEE Access

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The cross-bonding is the most common shield/sheath-bonding system now in use on singleconductor shielded power cables for long distance power transmission. But the complex bonding brings great challenges to the assessment of cable ageing conditions. This paper proposes a non-intrusive ageing assessment method using the transient disturbances originating from the system. The cable relative permittivities, instead of the traditional dielectric loss angle, were extracted from the responses of the transient disturbances to character the ageing state more sensitively. The decoupling analysis of the crossbonded cable and the corresponding relative permittivity identification model were investigated. Since the transient disturbances appear naturally and frequently, a continuous tracking of the cable ageing conditions can be established without interferences to the power system. Moreover, only the magnitudes rather than the phase angles of the cable currents/voltages are required in this method, which effectively simplifies the functions of the signal acquisition devices. The proposed method provides a new idea to assess the ageing conditions of the cross-bonded cables, and has the potential to be applied in industry. INDEX TERMS cross-bonded cable, ageing, transient disturbances, non-intrusive

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Ageing Assessment of XLPE LV Cables for Nuclear Applications Through Physico-Chemical and Electrical Measurements

Cited by 43 publications

References 28 publications

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

Aging Life Evaluation of Coal Mining Flexible EPR Cables Under Multi-Stresses

Transient Disturbances Based Non-Intrusive Ageing Condition Assessment for Cross-Bonded Cables

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