电—热—力多场老化对500 kV直流XLPE电缆绝缘特性的影响

刘嘉浩; 彭维龙; 于锦程; 张磊; 宋家乐; 张添胤; 陈向荣

doi:10.13296/j.1001-1609.hva.2026.10.019

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电—热—力多场老化对500 kV直流XLPE电缆绝缘特性的影响

研究与分析 | 更新时间：2026-10-14

- 电—热—力多场老化对500 kV直流XLPE电缆绝缘特性的影响
- Effect of Electro-thermal-mechanical Multi-physics Aging on the Insulation Performance of 500 kV DC XLPE Cables
- 高压电器 2026年62卷第10期页码：168-174
- 作者机构：
  
  浙江大学电气工程学院，杭州 310027
  国网浙江省电力有限公司舟山供电公司，浙江舟山 316000
- 作者简介：
  
  刘嘉浩（2000—），男，硕士研究生，研究方向为电力电缆绝缘测试和可靠性分析等（通信作者）（E-mail：jiahaoliu@zju.edu.cn）。
  陈向荣（1982—），男，教授，博导，研究方向为先进电气材料与高压绝缘测试技术、先进电力装备与新型电力系统、高电压新技术等（E-mail：chenxiangrongxh@zju.edu.cn）。
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.10.019
  中图分类号：
- 收稿：2026-05-15，
  
  修回：2026-07-24，
  
  纸质出版：2026-10-16
- 稿件说明：
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刘嘉浩, 彭维龙, 于锦程, 等. 电—热—力多场老化对500 kV直流XLPE电缆绝缘特性的影响[J]. 高压电器, 2026,62(10):168-174.

LIU Jiahao, PENG Weilong, YU Jincheng, et al. Effect of Electro-thermal-mechanical Multi-physics Aging on the Insulation Performance of 500 kV DC XLPE Cables[J]. High Voltage Apparatus, 2026, 62(10): 168-174.
刘嘉浩, 彭维龙, 于锦程, 等. 电—热—力多场老化对500 kV直流XLPE电缆绝缘特性的影响[J]. 高压电器, 2026,62(10):168-174. DOI： 10.13296/j.1001-1609.hva.2026.10.019.

LIU Jiahao, PENG Weilong, YU Jincheng, et al. Effect of Electro-thermal-mechanical Multi-physics Aging on the Insulation Performance of 500 kV DC XLPE Cables[J]. High Voltage Apparatus, 2026, 62(10): 168-174. DOI： 10.13296/j.1001-1609.hva.2026.10.019.

摘要

为了研究电、热、力多物理场老化对500 kV直流交联聚乙烯（cross-linked polyethylene，XLPE）电缆绝缘特性的影响，文中建立电—热—力联合老化实验平台，采用500 kV直流XLPE电缆绝缘环切试样，在110℃条件下，分别施加30、50、80 N拉伸应力，根据不同实验条件分组对XLPE绝缘试样进行7天的加速老化，采用差示扫描量热法、宽频介电谱仪和直流击穿测试对试样进行实验，研究XLPE试样在高温、电场和拉伸应力协同老化作用下的绝缘性能。结果表明：在电—热—力多场老化作用下，XLPE试样的结晶度老化7天后降至24.47%，片晶厚度增加到5.94 nm，施加更大的拉伸应力使结晶度进一步下降，片晶厚度增加。老化作用下试样的相对介电常数和介质损耗角正切随老化时间以及拉伸应力的增加而增大，老化7天后均达到最大值；施加80 N拉伸应力时，相对介电常数增加到3.54，介质损耗角正切增加了250.28%。XLPE试样的直流击穿强度随老化时间增加而降低，施加80 N的拉伸应力时XLPE试样击穿强度降低了45.64%。研究工作为500 kV直流XLPE电缆的可靠运行提供了实验数据和参考。

Abstract

To investigate the effects of electro-thermal-mechanical multi-physics aging on the insulation characteristics of 500 kV DC cross-linked polyethylene(XLPE)cables

in this paper a combined electro-thermal-mechanical aging experimental platform is established. Ring-cut specimens of 500 kV DC XLPE cables are adopted and the tensile stress of 30 N

50 N

and 80 N are applied respectively at 110℃. The XLPE insulation specimens are divided into different groupsin accordance with the experimental conditions and underwent aging for 7 days. The insulation performance of the XLPE specimens under synergistic aging effects of high temperature

electric field

and tensile stress is evaluated using differential scanning calorimetry(DSC)

broadband dielectric spectroscopy

and DC breakdown testing. The results show that under the action of electro-thermal-mechanical multi-field aging

the crystallinity of XLPE specimensis decreased to 24.47% after 7 days of aging

while the lamerllar thickness is increased to 5.94 nm. Thecrystallinity is reduced and the lamellar thickness is increased further by the application of hgiher tensile stress. The relative dielectric constant and dielectric loss tangent of the specimens is increased with aging time and tensile stress

reaching the maximum values after 7 days of aging. In case of applying a tensile stress of 80 N

the relative dielectric constant is increased to 3.54 and dielectric loss tangent is increased by 250.28% .The DC breakdown strength of XLPE samples is decreased with increasing aging time and

in case of applying a tensile stress of 80 N

the breakdown strength of XLPE samples is decreased by 45.64%. The research work provides experimental data and reference for the reliable operation of 500 kV DC XLPE cables.

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