基于多维介电参数雷达谱图的XLPE电缆老化状态综合评估

Comprehensive evaluation for ageing condition of XLPE cable based on radar chart of multidimensional dielectric parameters

极化-去极化电流(PDC)法被广泛用于评估交联聚乙烯(XLPE)电缆的绝缘状态,但现有研究倾向于采用单一介电特征参数反映绝缘的老化情况,未充分利用PDC结果中丰富的介电响应信息,且单一介电参数难以适用于不同的老化类型。为解决上述问题,本文提出了一种改进的雷达谱图评估方法,以综合利用多维介电参数,全面评估XLPE电缆的绝缘状态。为验证所提方法的有效性,对人工加速热老化与水树老化的XLPE短电缆试样进行了PDC测试,并利用提出的多维介电参数雷达谱图方法对PDC测试结果进行分析。结果表明:雷达谱图中多边形面积参数能够较好地反映两种老化XLPE电缆的老化程度。

Polarization-depolarization current(PDC)method is widely used to evaluate the insulation status of cross-linked polyethylene(XLPE)cables.However,the existing studies tend to use a single dielectric characteristic parameter to reflect the ageing condition of insulation,which does not make full use of the rich dielectric response information in PDC results,and a single dielectric parameter is difficult to apply to different ageing types.To solve the above problems,an improved radar spectroscopy evaluation method was proposed to evaluate the insulation condition of XLPE cable by comprehensively utilizing multidimensional dielectric parameters.To verify the effectiveness of the proposed method,PDC test was conducted on short XLPE cable specimens after being artificially accelerated thermal and water tree ageing.Then the PDC results were analyzed by the proposed multidimensional dielectric parameter radar spectroscopy method.The results show that the area parameter of polygon in radar chart can effectively reflect the degree of ageing in both types of aged XLPE cables.