High temperature PD degradation characteristics in bulk and interfaces of insulating materials for power cables

Maruyama, A.; Komori, F.; Suzuoki, Yasuo; Okamoto, Tatsuki; Nagata, T.

doi:10.1109/icpadm.2000.875682

Cited by 2 publications

(4 citation statements)

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“…Parameters of the extended Debye model of cables are calculated by equation (8), while the aging factor of the four tested cables is calculated by equation (10) and equation (11), as shown in Table 4. If the insulation state of the XLPE is worse, the branch resistance will be larger and the time constant of the extended Debye model will be smaller.…”

Section: Verification Of Experimental Resultsmentioning

confidence: 99%

“…The end of the depolarization current curve mainly depends on the resistance and capacitance of j-max branch [32]. According to this principle, parameters of branch j = 3 can be obtained by fitting the end of idep(t) with equation (8). Subtracting the current generated by branch j = 3 from idep(t), the end of the residual current curve is used to fit branch j = 2.…”

Section: B Influence Of Thermal Aging On Depolarization Charge and Parameters Of Extended Debye Model 1) Variation Of Depolarization Charmentioning

confidence: 99%

“…According to IEC-60502, during operation, the maximum temperature of cable insulation can reach 90 ℃, even up to 250 ℃ when faults occur. The thermal aging caused by cable overheating will bring irreversible damage to the XLPE insulation, and the high temperature will promote the formation of water trees and electricity tree to a certain extent, which leads to the decline of cable insulation performance eventually [6]- [8]. The degradation of the insulation capacity will reduce the reliability of power transmission and even affect the safe operation of the power grid.…”

Section: Introductionmentioning

confidence: 99%

“…There are three types of polarization process in the XLPE, and their equivalent circuit models are shown in Fig.3. If the time constant τj=RjCj, the depolarization current fits into the equation(8…”

mentioning

confidence: 99%

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Assessment of Thermal Aging Degree of 10kV Cross-Linked Polyethylene Cable Based on Depolarization Current

Zhang

Jiang

et al. 2021

IEEE Access

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During the long-term operation of high-voltage cross-linked polyethylene (XLPE) cables, the cable will gradually deteriorate under the effect of various aging factors. Thermal aging is one of the key factors directly related to the long-term operation reliability of the XLPE cables. In this paper, the thermal aging samples are prepared for PDC measurement. Based on the polymer trap theory and the extended Debye model, the shape of PDC curve, depolarization charge, parameters of the extended Debye model, aging factor (A), elongation at break retention rate (EB%) and their relationships under different thermal aging degrees are analyzed. The results show that the depolarization current curve and the depolarization charge can preliminarily judge the aging condition of the XLPE, but it is not accurate enough. R3 and τ3 of the branch, with the largest time constant must be the most sensitive to cable aging. With the increase of aging degree, the A shows an upward trend, and has a nonlinear relationship with EB%. Under the aging temperature of 140 ℃, after 15-25 days of aging, the A suggests the samples are in the moderate to severe aging stage, and the PDC test should be performed on carried out for the cables with that have been used for 21 years of operation to evaluate the insulation aging condition. The study reveals that the PDC-based parameters can be serviced as an effective tool for the aging condition prediction of XLPE cable insulation.INDEX TERMS XLPE cable, polarization/depolarization current (PDC), thermal aging, insulation diagnosis, aging factor, elongation at break.

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Section: Verification Of Experimental Resultsmentioning

confidence: 99%

Section: B Influence Of Thermal Aging On Depolarization Charge and Parameters Of Extended Debye Model 1) Variation Of Depolarization Charmentioning

confidence: 99%