Digital algorithm based on orthogonal decomposition for measurement of dielectric loss factor

Duan, Dengping; Zeng, Yan; Huang, Chunyi; Sheng, Gehao; Jiang, Xiuchen; Sun, Chuan

doi:10.1049/iet-gtd:20080097

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…11 (b) can be obtained by calculating the curve of Fig. 11 (a) using equation (5). With the increase of aging time, the increment of Q4 is obviously larger than that of Q3.…”

Section: Verification Of Experimental Resultsmentioning

confidence: 99%

“…The discharge quantity of two parts is directly affected by the aging degree. The discharge capacity of the two parts can be calculated by equation (5), and the change with aging time is shown in Fig. 8.…”

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

confidence: 99%

“…Existing researches have indicated that longterm exposure of the power cable to high temperature, water and electric field for a long time that will cause insulation problem [3], [4]. Among them, thermal aging is key factor for insulation performance [5]. According to IEC-60502, during operation, the maximum temperature of cable insulation can reach 90 ℃, even up to 250 ℃ when faults occur.…”

Section: Introductionmentioning

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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“…11 (b) can be obtained by calculating the curve of Fig. 11 (a) using equation (5). With the increase of aging time, the increment of Q4 is obviously larger than that of Q3.…”

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%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…, q − 1. According to (11), the polynomial of cubic spline interpolation can be got by two times integration of y (k), then the cubic spline interpolation function can be expressed as follows: where k ∈ [k i , k i+1 ] (i = 0, 1, . .…”

Section: B Theory Of Time-domain Quasi-synchronousmentioning

confidence: 99%

“…One is the hardware realization method with zero crossing comparator and balance bridge method, which requires high cost to achieve a high accuracy and has a weak disturbance resistance [7]. The other is the software realization method, such as fast Fourier transform (FFT) method [8], [9], Manuscript orthogonal filtering technique [10], [11], and so on. Moreover, FFT has been widely used owing to its stability and quality of disturbance resistance [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

Fast Measurement of Dielectric Loss Angle With Time-Domain Quasi-Synchronous Algorithm

Wang

Teng

Wen

et al. 2015

IEEE Trans. Instrum. Meas.

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Fast Fourier transform (FFT) algorithm inevitably suffers from spectral leakage and picket-fence effect under asynchronous sampling and nonintegral period truncation. So the FFT-based dielectric loss angle (DLA) measurement needs window functions and spectral lines interpolation algorithm, which requires massive sampled data and high computational cost. Therefore, this paper proposes a DLA measurement method on the basis of time-domain quasi-synchronous sampling technique to achieve fast measurement and high accuracy. First, the fundamental frequencies of the original voltage and current sampled signals were estimated accurately with the time-domain Newton interpolation algorithm. Then, the quasi-synchronous sampled sequences (QSSA) of the original asynchronous sampled signals were reconstructed using cubic spline interpolation algorithm. Finally, the DLA was calculated according to the equivalent circuit model and frequency-domain analysis of voltage and current QSSA based on FFT. The proposed method in this paper can perfectly restrain spectral leakage and picket-fence effect without window functions and spectral lines interpolation algorithm. The results of simulation and the implementation on the embedded system have confirmed the effectiveness of the proposed algorithm in this paper with less sampled data and lower computational cost. Index Terms-Cubic spline interpolation, dielectric loss angle (DLA), fast Fourier transform (FFT), Newton interpolation, time-domain quasi-synchronous (TDQS).

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Active power coefficient control for grid-tied photovoltaic system under voltage distortions

Kumar

Patel

Gupta

et al. 2020

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Digital algorithm based on orthogonal decomposition for measurement of dielectric loss factor

Cited by 8 publications

References 5 publications

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

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

Fast Measurement of Dielectric Loss Angle With Time-Domain Quasi-Synchronous Algorithm

Active power coefficient control for grid-tied photovoltaic system under voltage distortions

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