CN117538707B - 一种基于综合水树评估因子的10kV XLPE电缆水树老化程度评估方法 - Google Patents

一种基于综合水树评估因子的10kV XLPE电缆水树老化程度评估方法 Download PDF

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CN117538707B
CN117538707B CN202311662282.7A CN202311662282A CN117538707B CN 117538707 B CN117538707 B CN 117538707B CN 202311662282 A CN202311662282 A CN 202311662282A CN 117538707 B CN117538707 B CN 117538707B
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郭蕾
喻安星
赵晨
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Southwest Jiaotong University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract

本发明公开了一种基于综合水树评估因子的10kV XLPE电缆水树老化程度评估方法,其特征在于包括以下步骤:对待测电缆进行极化‑去极化电流测试得到极化‑去极化电流;测量电缆不同电压频率的复介电常数;分别计算电流因子、老化因子、极化因子;最后得到可表征电缆水树老化程度的综合水树评估因子,根据综合水树评估因子评估电缆水树老化程度。该方法的有益效果在于:可无损、准确地对XLPE电缆老化程度进行评估,能够判断电缆的老化程度,对保障电缆的可靠稳定运行具有重要意义。

Description

一种基于综合水树评估因子的10kV XLPE电缆水树老化程度 评估方法
技术领域
本发明属于评估10kVXLPE电缆老化状态评估领域,具体涉及一种XLPE电缆水树老化程度评估方法,该方法提供了一种电缆水树老化程度无损检测的新方法。
背景技术
交联聚乙烯(XLPE)电缆因其学稳定性好、耐寒、耐辐射、绝缘性好、载流能力大、导电性能好等优点而被广泛应用于输电线路中。截至到目前,我国城市新建的配电电缆中XLPE电缆占比已达90%以上。然而XLPE电缆在实际运行过程中会遭受到电流过载导致的发热、所处环境的水分侵蚀以及绝缘层的氧化反应等多种因素的影响,电缆中容易产生水树老化、热老化等一系列影响XLPE电缆安全运行的问题。电老化中的水树老化又是导致XLPE电缆绝缘性能下降、寿命缩短、影响电网安全运行的主要因素之一。
为了减少或避免电缆因绝缘层水树老化问题而导致的电网运行故障,降低经济损失。本发明方法在于通过无损检测的方法快速、准确地判别电缆绝缘的水树老化程度,寻找XLPE电缆宏观参数与综合水树评估因子的之间的联系,以便掌握运行电缆水树老化程度,避免电缆进一步劣化。
发明内容
本发明公开了一种基于综合水树评估因子的10kVXLPE电缆水树老化程度评估方法,其特征在于包括以下步骤:
第一步:对待测XLPE电缆进行极化-去极化电流测试,得到极化电流和去极化电流;根据公式(1)得到XLPE电缆的电流因子σ:
其中σ为电流因子;ε为真空介电常数;R1为XLPE绝缘层的内半径,m;R2为XLPE绝缘层的外半径,m;为直流电源U0,V;L为电缆绝缘层的纵向长度,m;ip(t)为电缆的极化电流,A;idep(t)为电缆的去极化电流,A;
第二步:对采集的去极化电流分解为如式(2)的3阶指数衰减的函数,并计算电缆的老化因子Af
其中Af为电缆的老化因子;ai为能够反映介质内的陷阱密度;τi为能够反映介质内的陷阱深度;I0为去极化电流的稳态值,A;e为自然常数;
第三步:对XLPE电缆进行电压频率分别为0.001Hz、0.01Hz、0.02Hz、0.1Hz、0.2Hz的5组复介电常数测试,记输入电压频率为:f1、f2、f3、f4、f5,将复介电常数实部值记为εi',复介电常数虚部值记为εi”(i=1,2…5);计算XLPE电缆的极化因子δ:
其中δ为电缆的极化因子;ε为真空介电常数;εi'为复介电常数实部值;εi”为复介电常数虚部值;fi为输入电压频率;
第四步:估计10kVXLPE电缆的水树密度:
其中ρ为电缆的综合水树评估因子;σ为电缆的电流因子;Af为电缆的老化因子,δ为电缆的极化因子;
第五步:评估10kVXLPE电缆的水树老化程度:
若ρ≤0.1547,则10kVXLPE电缆水树轻度老化;
若0.1547<ρ≤0.4362,则10kVXLPE电缆水树中度老化;
若ρ>0.4362,则10kVXLPE电缆水树重度老化。
本发明的有益效果在于:利用无损的极化-去极化电流测试和不同电压频率复介电常数测试,利用得到的数据进行计算分别得到电流因子、老化因子、极化因子,最后计算得到XLPE电缆的综合水树评估因子,从而实现了对XLPE电缆水树老化程度的无损评估,本发明方法可为XLPE电缆水树检测提供参考。
附图说明
图1为本发明涉及的一种基于综合水树评估因子相结合的10kV XLPE电缆水树老化程度评估方法的流程图
具体实施方式
下面结合附图对本发明作进一步说明:
本发明公开了一种基于综合水树评估因子的10kVXLPE电缆水树老化程度评估方法,其特征在于包括以下步骤:
第一步:对待测XLPE电缆进行极化-去极化电流测试,得到极化电流和去极化电流;根据公式(1)得到XLPE电缆的电流因子σ:
其中σ为电流因子;ε为真空介电常数;R1为XLPE绝缘层的内半径,m;R2为XLPE绝缘层的外半径,m;为直流电源U0,V;L为电缆绝缘层的纵向长度,m;ip(t)为电缆的极化电流,A;idep(t)为电缆的去极化电流,A;
第二步:对采集的去极化电流分解为如式(2)的3阶指数衰减的函数,并计算电缆的老化因子Af
其中Af为电缆的老化因子;ai为能够反映介质内的陷阱密度;τi为能够反映介质内的陷阱深度;I0为去极化电流的稳态值,A;e为自然常数;
第三步:对XLPE电缆进行电压频率分别为0.001Hz、0.01Hz、0.02Hz、0.1Hz、0.2Hz的5组复介电常数测试,记输入电压频率为:f1、f2、f3、f4、f5,将复介电常数实部值记为εi',复介电常数虚部值记为εi”(i=1,2…5);计算XLPE电缆的极化因子δ:
其中δ为电缆的极化因子;ε为真空介电常数;εi'为复介电常数实部值;εi”为复介电常数虚部值;fi为输入电压频率;
第四步:估计10kVXLPE电缆的水树密度:
其中ρ为电缆的综合水树评估因子;σ为电缆的电流因子;Af为电缆的老化因子,δ为电缆的极化因子;
第五步:评估10kVXLPE电缆的水树老化程度:
若ρ≤0.1547,则10kVXLPE电缆水树轻度老化;
若0.1547<ρ≤0.4362,则10kVXLPE电缆水树中度老化;
若ρ>0.4362,则10kVXLPE电缆水树重度老化。

Claims (1)

1.一种基于综合水树评估因子的10kV XLPE电缆水树老化程度评估方法,具体包括以下步骤:
第一步:对待测XLPE电缆进行极化-去极化电流测试,得到极化电流和去极化电流;根据公式(1)得到XLPE电缆的电流因子σ:
其中σ为电流因子;ε为真空介电常数;R1为XLPE绝缘层的内半径,m;R2为XLPE绝缘层的外半径,m;为直流电源U0,V;L为电缆绝缘层的纵向长度,m;ip(t)为电缆的极化电流,A;idep(t)为电缆的去极化电流,A;
第二步:对采集的去极化电流分解为如式(2)的3阶指数衰减的函数,并计算电缆的老化因子Af
其中Af为电缆的老化因子;ai为能够反映介质内的陷阱密度;τi为能够反映介质内的陷阱深度;I0为去极化电流的稳态值,A;e为自然常数;
第三步:对XLPE电缆进行电压频率分别为0.001Hz、0.01Hz、0.02Hz、0.1Hz、0.2Hz的5组复介电常数测试,记输入电压频率为:f1、f2、f3、f4、f5,将复介电常数实部值记为εi',复介电常数虚部值记为εi”(i=1,2…5);计算XLPE电缆的极化因子δ:
其中δ为电缆的极化因子;ε为真空介电常数;εi'为复介电常数实部值;εi”为复介电常数虚部值;fi为输入电压频率;
第四步:估计10kVXLPE电缆的水树密度:
其中ρ为电缆的综合水树评估因子;σ为电缆的电流因子;Af为电缆的老化因子,δ为电缆的极化因子;
第五步:评估10kVXLPE电缆的水树老化程度:
若ρ≤0.1547,则10kVXLPE电缆水树轻度老化;
若0.1547<ρ≤0.4362,则10kVXLPE电缆水树中度老化;
若ρ>0.4362,则10kVXLPE电缆水树重度老化。
CN202311662282.7A 2023-12-06 2023-12-06 一种基于综合水树评估因子的10kV XLPE电缆水树老化程度评估方法 Active CN117538707B (zh)

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CN105548827A (zh) * 2015-12-04 2016-05-04 西安交通大学 一种用于评估电缆老化及运行状态的非破坏性方法
CN107843817A (zh) * 2017-11-06 2018-03-27 四川大学 一种基于极化去极化电流法的电缆绝缘老化检测方法

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JP2000292476A (ja) * 1999-04-12 2000-10-20 Furukawa Electric Co Ltd:The 電力ケーブルの劣化診断方法
JP4406193B2 (ja) * 2002-08-28 2010-01-27 財団法人電力中央研究所 電力ケーブルの劣化診断方法及び電力ケーブルの劣化診断用装置
CN109142992A (zh) * 2018-07-11 2019-01-04 国网上海市电力公司 一种35千伏交联电缆绝缘老化状态评估方法
CN112557843B (zh) * 2020-11-24 2021-08-13 西南交通大学 一种xlpe电缆绝缘层水树老化程度的评估方法

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Publication number Priority date Publication date Assignee Title
CN105548827A (zh) * 2015-12-04 2016-05-04 西安交通大学 一种用于评估电缆老化及运行状态的非破坏性方法
CN107843817A (zh) * 2017-11-06 2018-03-27 四川大学 一种基于极化去极化电流法的电缆绝缘老化检测方法

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