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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Physicochemical origin of space charge dynamics for aged XLPE cable insulation
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Physicochemical origin of space charge dynamics for aged XLPE cable insulation

机译:老化XLPE电缆绝缘的空间电荷动力学的理化起源

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摘要

The occurrence of ageing of cross-linked polyethylene (XLPE) cable insulation greatly affects the safe operation of cable system. The influence of different ageing modes on the space charge dynamics and physicochemical properties of insulating materials in highvoltage alternating current (HVAC) XLPE cables was investigated. The XLPE specimens were obtained from un-aged cables, 1-year laboratory accelerated aged cables, and 22- year practical cables. Pulsed Electro-Acoustic (PEA) technique was used to measure the space charge dynamics and accumulation properties in the aged XLPE insulation. Differential Scanning Calorimetry (DSC) and Fourier-Transform Infrared (FTIR) were used to reveal the details of their physicochemical properties. It was found that the homocharge accumulated at the aluminum (Al) electrode for the un-aged cables, while the hetero-charge for aged cable insulations. The total amount of homo-charge near anode decreases with temperature for un-aged specimens, while the amount of hetero-charge increases with temperature for aged specimens. It was suggested that, the homo-charge results from charge injection of electrodes, and the hetero-charge appear to be intimately related with the ionization of ageing products in XLPE insulation. Additionally, the total charge of un-aged cables and 22-year practical cables increased along the radial direction from inner to outer, whereas the total charge of 1-year accelerated aged cables decreased. It was suggested that accelerated ageing of cables starts from the inside of the insulating materials, while ageing of 22-year practical cables starts from the outside. It was also found that two new absorption peaks appeared in FTIR spectrums of aged specimens around 1720 cm-1 and 3500 cm-1, and the carbonyl groups increase with ageing time. The crystallization morphology, impurity particles ionization, injection and transportation of charges show great effect on the space charge dynamics.
机译:交联聚乙烯(XLPE)电缆绝缘层的老化会极大地影响电缆系统的安全运行。研究了不同老化模式对高压交流(HVAC)XLPE电缆中绝缘材料的空间电荷动力学和理化性质的影响。 XLPE标本来自未老化的电缆,1年实验室加速老化的电缆和22年实用的电缆。脉冲电声(PEA)技术用于测量老化XLPE绝缘体中的空间电荷动力学和累积特性。差示扫描量热法(DSC)和傅立叶变换红外(FTIR)用于揭示其理化性质的详细信息。发现未老化电缆的铝(Al)电极上积累的均电荷,而老化电缆绝缘的杂电荷则积累在铝电极上。对于未老化的试样,阳极附近的均电荷总量随温度降低,而对于老化的试样,杂电荷量随温度升高。有人认为,均电荷是由电极的电荷注入引起的,杂电荷似乎与XLPE绝缘中老化产物的电离密切相关。此外,未老化电缆和22年实用电缆的总电荷沿径向从内到外增加,而1年加速老化电缆的总电荷减少。建议从绝缘材料的内部开始加速电缆的老化,而从外部开始22年实用电缆的老化。还发现在老化样品的FTIR光谱中,在1720 cm-1和3500 cm-1附近出现了两个新的吸收峰,羰基随老化时间的增加而增加。结晶形态,杂质粒子的电离,电荷的注入和输运对空间电荷动力学有很大影响。

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