Electrical Tree Driven Breakdown of XLPE Under Step Stress Breakdown Test at Multiple Frequencies

Arachchige, Thanuja Gawasingha; Xin, Zhong; Ekanayake, Chandima; Ma, Hui; Saha, Tapan Kumar

doi:10.1109/tdei.2021.009903

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…In the test, the voltage is increased at a uniform rate of 1 kV/s until the breakdown of the samples, and the results obtained from the test are shown in Figure 9. The two-parameter Weibull distribution model shown in Equation (12) analyzes the short-time breakdown electric field strength data [19].…”

Section: Obtaining N Values By Constant Stress Testmentioning

confidence: 99%

“…In the test, the voltage is increased at a uniform rate of 1 kV/s until the breakdown of the samples, and the results obtained from the test are shown in Figure 9. The two‐parameter Weibull distribution model shown in Equation (12) analyzes the short‐time breakdown electric field strength data [19].

\begin{equation}F\left( E \right) = 1 - \exp \left[ { - {{\left( {E/a} \right)}}^\beta } \right],\end{equation}

where F ( E ) is the failure rate when the external applied electric field strength is E , and α and β represent the scale and shape parameters.…”

Section: Tests and Data Validationmentioning

confidence: 99%

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Impact of step voltage parameters on accuracy of evaluating XLPE insulation DC voltage endurance coefficient

Ma,

Li,

Chen

et al. 2023

IET Generation Trans & Dist

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The voltage endurance coefficient n of cross‐linked polyethylene (XLPE) insulation is an important indicator for the analysis of insulation failure mechanism. Accurately obtaining the value of n can provide technical support for the reliability evaluation of cable operation. The constant stress method and the step stress method are used to obtain the values of n, but the test parameters can influence the accuracy of the obtained n values. Two methods for selecting test parameters are proposed. The equivalence between the two methods is established, providing theoretical support for the accurate evaluation of the n value of solid insulation materials by using the step stress method. The accuracy of the evaluation results is verified by analyzing the test data. The test results show that the nstep = 13.04 evaluated by the step stress test with the proposed parameter selection method is consistent with the test result of constant stress nconstant = 12.83.

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Section: Obtaining N Values By Constant Stress Testmentioning

confidence: 99%

\begin{equation}F\left( E \right) = 1 - \exp \left[ { - {{\left( {E/a} \right)}}^\beta } \right],\end{equation}

where F ( E ) is the failure rate when the external applied electric field strength is E , and α and β represent the scale and shape parameters.…”

Section: Tests and Data Validationmentioning

confidence: 99%

Impact of step voltage parameters on accuracy of evaluating XLPE insulation DC voltage endurance coefficient

Ma,

Li,

Chen

et al. 2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

Characterization of Electrical Tree Initiation and Growth in XLPE Under Harmonic Waveforms

Arachchige¹,

Xin²,

Ekanayake³

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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Locating Method for Electrical Tree Degradation in XLPE Cable Insulation Based on Broadband Impedance Spectrum

Han

Yao

et al. 2022

Polymers

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Electrical treeing is one of the main causes of crosslinked polyethylene (XLPE) cable failure. The current methods for locating electrical trees are mainly based on the partial discharge (PD) signal. However, PD signals are easily attenuated in the long cable and the PD test voltage may cause damage to the insulation. This work proposes an improved broadband impedance spectrum (BIS) method to locate electrical trees in XLPE cable. A mathematical model of a long cable containing local electrical tree degradation is established. The Gaussian signal is chosen as the simulated incident signal to reduce the spectral leakage. The location spectrum is obtained by multiplying the frequency domain function of the single-ended reflection coefficient and the Gaussian pulse. It has been found that the location spectrum of the local capacitance change can be characterized as a typical double-peak waveform and the spectrum of the local conductance change can be regarded as a typical single-peak waveform. Electrical tree experiments at different temperatures were carried out to initiate different types of electrical trees. A vector network analyzer (VNA) was used to test the high frequency capacitance characteristics in the treeing process. The location spectra of the 20 m long cable containing different types of electrical trees was calculated by the improved location algorithm. The results show that the location error of local electrical tree degradation is less than 3%. The capacitance of the sliced sample decreases with treeing time. The effect of the bush-pine tree on capacitance parameters is greater than that of the branch-pine tree. A typical double-peak is found in the bush-pine tree location spectrum and a single-peak is found in the branch-pine tree spectrum.

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Electrical Tree Driven Breakdown of XLPE Under Step Stress Breakdown Test at Multiple Frequencies

Cited by 3 publications

References 24 publications

Impact of step voltage parameters on accuracy of evaluating XLPE insulation DC voltage endurance coefficient

Impact of step voltage parameters on accuracy of evaluating XLPE insulation DC voltage endurance coefficient

Characterization of Electrical Tree Initiation and Growth in XLPE Under Harmonic Waveforms

Locating Method for Electrical Tree Degradation in XLPE Cable Insulation Based on Broadband Impedance Spectrum

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