Investigation of Effects of Thermal Ageing on Dielectric Properties of Low Voltage Cable Samples by using Dielectric Response Analyzer

Bal, Semih; Tamus, Zoltán Ádám

doi:10.1109/diagnostika55131.2022.9905157

Cited by 4 publications

(7 citation statements)

References 18 publications

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“…However, in the case of AC voltage, the amplitude and phase of the current are assessed across a wide frequency spectrum. DRM is used to monitor the degradation of LV cables [42].…”

Section: Measurement Techniques 231 Dielectric Response Measurementmentioning

confidence: 99%

A Method for Assessing the Degradation of PVC-Insulated Low-Voltage Distribution Cables Exposed to Short-Term Cyclic Aging

Bal,

Tamus

2024

Electronics

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The distribution grid comprises cables with diverse constructions. The insulating material used in low-voltage (LV) distribution cables is predominantly PVC. Furthermore, the presence of cables with different structures in the grid poses challenges in detecting the aging of the cable network. Finding a universal and dependable condition-monitoring technique that can be applied to various types of cables is indeed a challenge. The diverse construction and materials used in different cables make it difficult to identify a single monitoring approach that can effectively assess the condition of all cables. To address this issue, this study aims to compare the thermal aging behavior of different LV distribution cables with various structures, i.e., one cable contains a PVC belting layer, while the other contains filler material. The growing adoption of distributed generation sources, electric vehicles, and new consumer appliances in low-voltage distribution grids can lead to short, repetitive overloads on the low-voltage cable network. Hence, these cable samples were exposed to short-term cyclic accelerated aging in the climate chamber at 110 °C. The cable’s overall behavior under thermal stress was evaluated through frequency and time domain electrical measurements (including tan δ and extended voltage response) and a mechanical measurement (Shore D). The tan δ was measured in the frequency range of 20 Hz–500 kHz by using the Wayne-Kerr impedance analyzer. The extended voltage response measurement was conducted using a C# application developed in-house specifically for laboratory measurements in the .NET environment. The study observed a strong correlation between the different measurement methods used, indicating that electrical methods have the potential to be adopted as a non-destructive condition-monitoring technique.

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“…However, in the case of AC voltage, the amplitude and phase of the current are assessed across a wide frequency spectrum. DRM is used to monitor the degradation of LV cables [42].…”

Section: Measurement Techniques 231 Dielectric Response Measurementmentioning

confidence: 99%

A Method for Assessing the Degradation of PVC-Insulated Low-Voltage Distribution Cables Exposed to Short-Term Cyclic Aging

Bal,

Tamus

2024

Electronics

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“…In general, tan δ and capacitance are measured in the frequency domain, and polarizationdepolarization currents are measured in the time domain [30]. These measurements are capable of monitoring the degradation of LV cables [25,26].…”

Section: Dielectric Response Measurementsmentioning

confidence: 99%

“…Respective information can be seen in Figure 6. The temperature for thermal aging was set to 110 • C. This temperature was chosen for easier comparison with the previous studies, and it was intended to use a temperature higher than specified in the standard [13,18,19,25,34,35]. Eighteen hours of aging have been reached.…”

Section: Thermal Ageingmentioning

confidence: 99%

“…Then short-term artificial cyclic ageing was applied to simulate the short-term temperature changes due to the load variation. Previous studies have successfully adopted dielectric spectroscopy measurements on LV cables [21,[25][26][27][28]. Therefore dielectric parameters, tan δ, capacitance, polarization and depolarization currents were measured after each ageing cycle.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Structural Dependence of Cyclical Thermal Ageing of Low Voltage PVC Insulated Cables

Bal¹,

Tamus²

2023

Preprint

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The widespread use of renewable energy sources has considerably expanded distributed generation. An unbalanced load on distribution cables may also result from the recent increase in novel appliances and electric vehicles, the reverse power flow may create short-term overloads. These transient overloads increase the temperature for a short time beyond the limit, which causes degradation. However, the temperature distribution on the cable is not even. Therefore, the cable components are not degraded evenly and similarly. This publication describes the change in electrical properties of low-voltage cables caused by short-term cyclic artificial ageing to track the impact of these brief temperature rises. This study examines how cable structure affects the dielectric characteristics of cable specimens. Four cable samples, each measuring 50 cm in length (SZAMKAM 0.6/1 kV 16 mm2× 4 manufactured by Prysmian MKM Kft, Hungary) put through an accelerated ageing test in a temperature-controlled oven after changing their structures by removing their layers. Three rounds, each of six hours, accelerated thermal ageing were applied. After each round of ageing, the dielectric parameter tanδ and capacitance were measured by Dirana Dielectric Response Analyzer in the laboratory at room temperature 24±0.5∘C. Furthermore, the polarization and depolarization currents were also studied. The results show that changing the cable structure impacts the dielectric parameters, especially the effect of belting layer is significant. From point of view of aging the PVC belting layer protects the diffusion of plasticizers of inner structure.

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“…By executing the aging in this way, the asymmetric aging of the cable components was not affected by their different temperatures but by their different positions inside the cable cross section, causing, e.g., differences in contact with the atmosphere or the interdiffusion of additives among them. Previous studies have successfully adopted dielectric spectroscopy measurements on LV cables [21,[25][26][27][28]. Therefore, the dielectric parameters, tan δ, the capacitance, and the polarization and depolarization currents were measured after each aging cycle.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Dependence of the Cyclical Thermal Aging of Low-Voltage PVC-Insulated Cables

Bal

Tamus

2023

Symmetry

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The increasing penetration of distributed generation sources in low-voltage distribution grids, electric vehicles, and new appliances from the consumer side can generate short repetitive overloads on the low-voltage cable network. This work investigates the change in the dielectric properties of low-voltage cable insulation caused by short-term overloads, examining how the cable structure affects the dielectric characteristics of the cable specimens in the case of cyclic short-term thermal aging. PVC-insulated low-voltage cable samples were exposed to an accelerated aging test in a temperature-controlled oven after changing their structures by removing different layers. Three aging cycles, each of six hours, were applied to the samples. After each cycle, the tan δ and capacitance were measured by an Omicron DIRANA Dielectric Response Analyzer in the laboratory at room temperature 24 ± 0.5 °C. Furthermore, the polarization and depolarization currents were also studied. The results show that changing the cable structure impacts the dielectric parameters; in particular, the effect of the belting layer is significant. From the point of view of aging, the PVC belting layer protects the diffusion of the plasticizers of the inner structure. The findings of the study show that an asymmetric aging phenomenon can be observed in different polymeric components of the cables, even though the cables were aged in an air-circulated oven ensuring a homogeneous temperature distribution in the samples.

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Investigation of Effects of Thermal Ageing on Dielectric Properties of Low Voltage Cable Samples by using Dielectric Response Analyzer

Cited by 4 publications

References 18 publications

A Method for Assessing the Degradation of PVC-Insulated Low-Voltage Distribution Cables Exposed to Short-Term Cyclic Aging

A Method for Assessing the Degradation of PVC-Insulated Low-Voltage Distribution Cables Exposed to Short-Term Cyclic Aging

Investigation of Structural Dependence of Cyclical Thermal Ageing of Low Voltage PVC Insulated Cables

Investigation of the Structural Dependence of the Cyclical Thermal Aging of Low-Voltage PVC-Insulated Cables

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