Partial discharge of cable termination on electric multiple unit of China high‐speed railway below zero‐degree centigrade

Bai, Longlei; Zhou, Lijun; Li, Lini; Chen, Yuanhu; Che, Yuxuan; Yu, Yan; Guo, Lan-Ping

doi:10.1049/iet-smt.2018.5277

Cited by 17 publications

(5 citation statements)

References 29 publications

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“…Ethylene-propylene rubber (EPR) material has excellent dielectric properties, and has outstanding performance in highand low-temperature resistance, ageing resistance, and sufficient flexibility. It has become the most widely used cable insulation material in high-speed rail [1,2].…”

Section: Introductionmentioning

confidence: 99%

Influence of surface discharge on the deterioration characteristics of ethylene‐propylene rubber cable insulation under alternating current high voltage

Bai

Fan

et al. 2022

IET Science Measure & Tech

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To investigate partial discharge-induced deterioration characteristics of ethylene-propylene rubber (EPR) cable insulation under repeated alternating current (AC) voltage on highspeed trains, an experimental platform with a column-plate EPR insulation model is established. The surface condition and breakdown voltage of insulation samples after discharge treatment are observed and measured. In addition, a fitting formula to evaluate the deterioration extent of EPR samples is proposed. The results show that under repeated discharge pretreatments, the volume resistivity increases first and decreases afterwards when discharge magnitude is low. When partial discharge (PD) intensity increases to 100 pC, the volume and surface resistivity decrease monotonously, and the decreasing rate is positively correlated with PD intensity. During PD pre-treatment, a white circle appears near the electrode and turns to pale yellow with PD intensity. For PD pretreatments of 50 and 100 pC, withstand voltage of EPR insulation increase first and decrease afterwards, and the downward trend is slow. For PD pre-treatments of 200 and 400 pC, the withstand voltage decreases significantly with the degradation time. The fitting formula model shows that under the action of a strong electric field, the relationship between the reliability of EPR insulation samples, the probability and rate of molecular chain breakage, and the intensity of discharge activity is not linear.

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Section: Introductionmentioning

confidence: 99%

Influence of surface discharge on the deterioration characteristics of ethylene‐propylene rubber cable insulation under alternating current high voltage

Bai

Fan

et al. 2022

IET Science Measure & Tech

Self Cite

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“…The cable of the high-speed electric multiple unit (EMU) plays a critical role in the power supply system of high-speed trains, directly impacting the safety of train operations. The terminal, as a vulnerable component of the high-speed EMU cable, is particularly susceptible to partial discharge (PD), which poses a threat to the efficient functioning of high-speed trains [ 1 , 2 , 3 , 4 ]. Detecting PD is crucial for assessing the insulation condition of cable terminals.…”

Section: Introductionmentioning

confidence: 99%

Convolutional Neural Network-Based Pattern Recognition of Partial Discharge in High-Speed Electric-Multiple-Unit Cable Termination

Sun,

Wu,

Pan

et al. 2024

Sensors

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Partial discharge detection is considered a crucial technique for evaluating insulation performance and identifying defect types in cable terminals of high-speed electric multiple units (EMUs). In this study, terminal samples exhibiting four typical defects were prepared from high-speed EMUs. A cable discharge testing system, utilizing high-frequency current sensing, was developed to collect discharge signals, and datasets corresponding to these defects were established. This study proposes the use of the convolutional neural network (CNN) for the classification of discharge signals associated with specific defects, comparing this method with two existing neural network (NN)-based classification models that employ the back-propagation NN and the radial basis function NN, respectively. The comparative results demonstrate that the CNN-based model excels in accurately identifying signals from various defect types in the cable terminals of high-speed EMUs, surpassing the two existing NN-based classification models.

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“…Ethylene propylene rubber (EPR) has become one of the fastest developing synthetic rubbers in the past 20 years and has been widely used as the train-mounted cable insulation material for electric locomotive due to its excellent mechanical properties, ozone resistance, thermal resistance, electrical insulation and chemical corrosion resistance [1][2][3]. The service status of EPR cables onboard electric locomotive is directly related to the safe and reliable operation of trains, and the reliability of EPR cable largely depends on the ageing degree of insulation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on ageing characteristics of electric locomotive ethylene propylene rubber cable under mechanical–thermal combined action

et al. 2022

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The train-mounted ethylene propylene rubber (EPR) cables of electric locomotive are partly restricted by the body structure and spatial layout and are in a combined environment of strong mechanical bending and thermal ageing. The degradation characteristics of the insulation layer have not yet received sufficient attention. In order to study the ageing characteristics of EPR cables of electric locomotive under the combined action of machine and thermal, this paper designs a bending-thermal combined ageing test platform for cables with a temperature of 135°C, bending diameter of 393.52 mm, 590.28 mm and unbending cables, and tests after ageing. The product has been tested by infrared spectroscopy, scanning electron microscopy, elongation at break and broadband dielectric spectroscopy. The research results show that the bending outer part of the train-mounted EPR cable is a pain point. Under the combined action of bending and thermal, whether it is microstructure or macro performance, the degradation rate and degree of the bending of outer insulation layer are greater than the value under a single thermal ageing condition. Mechanical bending has an accelerating effect on the ageing of the EPR insulation layer. The research results can provide a reference for the ageing characteristics of the train-mounted EPR cable under the bending-thermal synergy and the evaluation of operating state of the train-mounted EPR cable under bending-thermal operating conditions.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Partial discharge of cable termination on electric multiple unit of China high‐speed railway below zero‐degree centigrade

Cited by 17 publications

References 29 publications

Influence of surface discharge on the deterioration characteristics of ethylene‐propylene rubber cable insulation under alternating current high voltage

Influence of surface discharge on the deterioration characteristics of ethylene‐propylene rubber cable insulation under alternating current high voltage

Convolutional Neural Network-Based Pattern Recognition of Partial Discharge in High-Speed Electric-Multiple-Unit Cable Termination

Experimental study on ageing characteristics of electric locomotive ethylene propylene rubber cable under mechanical–thermal combined action

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