Effects of Temperature Gradient on Electrical Tree Initiation and Breakdown Phenomenon in XLPE Under Harmonic Superimposed DC Voltage

Zhu, Lewei; Du, B. X.; Hou, Kai

doi:10.1109/access.2020.3049089

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…The breakdown strength was slightly larger for CV@GT-Cs rather than CV@GT-As in Figure 8 b. The difference between the heated cathode and anode cases has been reported in previous studies [ 44 , 45 ]. The difference between @GT-Cs and @GT-As originated from the position of the maximum electric field, as depicted in Figure 3 and Figure 4 .…”

Section: Prediction Of Breakdown Strength With Electro-mechanical Threshold Energy Conditionsupporting

confidence: 67%

“…Numbers 1 to 3 indicate the cases at 30 °C~50 °C; 30 °C~70 °C; and 50 °C~70 °C, respectively. The breakdown strength decreased as the temperature gradient increased [ 44 ]. The breakdown strength was slightly larger for CV@GT-Cs rather than CV@GT-As in Figure 8 b.…”

Section: Prediction Of Breakdown Strength With Electro-mechanical Threshold Energy Conditionmentioning

confidence: 99%

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Modified Molecular Chain Displacement Analysis Employing Electro-Mechanical Threshold Energy Condition for Direct Current Breakdown of Low-Density Polyethylene

Kim

Lee

2021

Polymers

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In an HVDC environment, space charge accumulated in polymeric insulators causes severe electric field distortion and degradation of breakdown strength. To analyze the breakdown characteristics, here, the space charge distribution was numerically evaluated using the bipolar charge transport (BCT) model, considering the temperature gradient inside the polymeric insulator. In particular, we proposed an electro-mechanical threshold energy condition, resulting in the modified molecular chain displacement model. The temperature gradient accelerates to reduce the breakdown strength with the polarity-reversal voltage, except during the harshest condition, when the temperature of the entire polymeric insulator was 70 °C. The energy imbalance inside the insulator caused by polarity-reversal voltage reduced the breakdown strength by 82%. Finally, this numerical analysis model can be used universally to predict the breakdown strength of polymeric insulators in various environments, and help in evaluating the electrical performance of polymeric insulators.

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Section: Prediction Of Breakdown Strength With Electro-mechanical Threshold Energy Conditionsupporting

confidence: 67%

Section: Prediction Of Breakdown Strength With Electro-mechanical Threshold Energy Conditionmentioning

confidence: 99%

Modified Molecular Chain Displacement Analysis Employing Electro-Mechanical Threshold Energy Condition for Direct Current Breakdown of Low-Density Polyethylene

Kim

Lee

2021

Polymers

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“…In our previous work, we found that compared with 1st, 5th, 7th, 9th harmonic order, the electrical tree length and the inception probability reached the maximum values at 3rd harmonic voltage [18], implying that 3rd harmonic voltage has a great influence on the growth of electrical tree, so we select 150 Hz as the harmonic frequency in this paper. Specific electrical tree experimental platform diagrams, voltage waveform diagrams and other details of the electrical tree experimental setup can be referred to [14,16]. Two kinds of temperature gradients are set in the experiment: (1) The temperature on ground side is fixed at 20°C, and the temperature on high voltage side varies from 20 to 80°C;…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…Each experimental group contains 20 test samples to ensure accuracy. More details could be referred to [14,16].…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…Studies showed that electrical trees grew faster under harmonic superimposed DC voltage [13][14][15]. When harmonics and temperature gradient act on the insulation at the same time, they will work together to accelerate the electrical tree degradation, and the safety of insulation under this special condition should be paid special attention [16]. Therefore, the effects of radical scavengers on electrical tree under this special condition should be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of radical scavenger on electrical tree in cross‐linked polyethylene with large harmonic superimposed DC voltage

Zhu

Hou

2022

High Voltage

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In this study, three kinds of radical scavenger Chimassorb 944, Tinuvin 622, and Tinuvin 770 are used to suppress the growth of electrical trees in cross‐linked polyethylene (XLPE) with transient superimposed voltage under the temperature gradient. The tree morphology, tree length, accumulated damage, and time to breakdown are used to investigate the effect of radical scavenger on the electrical treeing process. It is found that under the temperature gradient caused by the temperature rise on the high voltage side, only Tinuvin 622 can always suppress the electrical tree as the temperature gradient rises. Under the temperature gradient caused by the temperature rise on the ground side, the three radical scavengers can all suppress the electrical tree. The breakdown of electrical tree exhibits the strong DC polarity dependence. Meanwhile, energy levels of these three radical scavengers are calculated through quantum chemistry, and the results indicate that radical scavengers have greater electron affinity, smaller ionisation energy, and smaller energy gap than XLPE. According to the surface potential decay test results at 60°C, it is found that all three radical scavengers can introduce deep traps. The different performances of radical scavengers under different temperature gradients and voltages are determined by the trap distribution characteristics, the molecular structure and chemical reaction of the additives themselves. It is concluded that Tinuvin 622 has potential for use in high voltage direct current XLPE cable application.

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Tree Growth in Epoxy Resin Under Unipolar and Bipolar Square-Wave Voltages

Aldawsari

Liu

McDonald

et al. 2022

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Effects of Temperature Gradient on Electrical Tree Initiation and Breakdown Phenomenon in XLPE Under Harmonic Superimposed DC Voltage

Cited by 4 publications

References 36 publications

Modified Molecular Chain Displacement Analysis Employing Electro-Mechanical Threshold Energy Condition for Direct Current Breakdown of Low-Density Polyethylene

Modified Molecular Chain Displacement Analysis Employing Electro-Mechanical Threshold Energy Condition for Direct Current Breakdown of Low-Density Polyethylene

Effect of radical scavenger on electrical tree in cross‐linked polyethylene with large harmonic superimposed DC voltage

Tree Growth in Epoxy Resin Under Unipolar and Bipolar Square-Wave Voltages

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