CN116125215A - A Method of Distribution Cable Status Detection Based on Partial Discharge - Google Patents
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- G01R31/12—Testing 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
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- G01R31/1272—Testing 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
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Abstract
Description
技术领域technical field
本发明涉及电缆检测技术领域，具体涉及一种基于局部放电的配电电缆状态检测方法。The invention relates to the technical field of cable detection, in particular to a method for detecting the state of distribution cables based on partial discharge.
背景技术Background technique
配电电缆故障已成为影响电网供电可靠性的重要问题之一，为了提高电网供电可靠性，需要定期对配电电缆进行状态检测，以便于根据电缆状态对电缆进行维护更换。Distribution cable failure has become one of the important issues affecting the reliability of power grid power supply. In order to improve the reliability of power grid power supply, it is necessary to regularly detect the status of distribution cables, so that the cables can be maintained and replaced according to the status of the cables.
发明内容Contents of the invention
本发明的目的在于提出一种基于局部放电的配电电缆状态检测方法，以提高电网供电可靠性。The purpose of the present invention is to propose a method for detecting the state of distribution cables based on partial discharge, so as to improve the reliability of power supply of the power grid.
为实现上述目的，本发明提出一种基于局部放电的配电电缆状态检测方法，包括如下步骤：In order to achieve the above object, the present invention proposes a distribution cable state detection method based on partial discharge, comprising the following steps:
进行电缆局部放电检测试验得到局部放电数据；所述局部放电数据包括多个离散采样点的局部放电量；performing a cable partial discharge detection test to obtain partial discharge data; the partial discharge data includes partial discharge quantities at multiple discrete sampling points;
对所述局部放电数据进行统计分析，拟合电缆应力的概率分布函数f(s)和电缆强度的概率分布函数h(s)；所述应力为电缆当前缺陷的最大放电量，所述强度为发生严重局放缺陷的电缆的最大局放量；Statistical analysis is carried out to described partial discharge data, the probability distribution function f (s) of fitting cable stress and the probability distribution function h (s) of cable strength; Described stress is the maximum discharge capacity of current defect of cable, and described strength is The maximum PD capacity of cables with serious PD defects;
根据所述局部放电数据、所述概率分布函数f(s)和概率分布函数h(s)计算故障指标F；calculating a fault index F according to the partial discharge data, the probability distribution function f(s) and the probability distribution function h(s);
根据所述故障指标F反推最大局部放电量s；Reversely deduce the maximum partial discharge amount s according to the fault index F;
根据所述最大局部放电量s与预设阈值的比较结果确定电缆状态。The status of the cable is determined according to a comparison result of the maximum partial discharge s with a preset threshold.
优选地，所述电缆强度的概率分布函数h(s)为：Preferably, the probability distribution function h(s) of the cable strength is:
所述电缆应力的概率分布函数f(s)为：The probability distribution function f(s) of the cable stress is:
其中，通过对所述局部放电数据进行统计分析，可以得到参数μ1、σ1、μ2、σ2。Wherein, the parameters μ 1 , σ 1 , μ 2 , and σ 2 can be obtained by statistically analyzing the partial discharge data.
优选地，所述根据所述局部放电数据、所述概率分布函数f(s)和概率分布函数h(s)计算故障指标F，包括：Preferably, the calculation of the fault index F according to the partial discharge data, the probability distribution function f(s) and the probability distribution function h(s) includes:
根据所述局部放电数据以及公式
优选地，所述根据所述故障指标F反推最大局部放电量s，包括：Preferably, the derivation of the maximum partial discharge s according to the fault index F includes:
根据公式
优选地，所述根据所述最大局部放电量s与预设阈值的比较结果确定电缆状态，包括：Preferably, the determining the cable status according to the comparison result of the maximum partial discharge s and a preset threshold includes:
对于普通电缆，若本体的最大局部放电量s小于等于100pC，则本体状态正常，否则本体状态异常；若接头的最大局部放电量s小于等于200pC，则接头状态正常，否则接头状态异常；若终端的最大局部放电量s小于等于2000pC，则终端状态正常，否则终端状态异常。For ordinary cables, if the maximum partial discharge s of the main body is less than or equal to 100pC, the main body is in normal state, otherwise the main body state is abnormal; if the maximum partial discharge s of the joint is less than or equal to 200pC, the joint is in normal state, otherwise the joint state is abnormal; if the terminal If the maximum partial discharge capacity s is less than or equal to 2000pC, the terminal state is normal, otherwise the terminal state is abnormal.
优选地，所述根据所述最大局部放电量s与预设阈值的比较结果确定电缆状态，包括：Preferably, the determining the cable status according to the comparison result of the maximum partial discharge s and a preset threshold includes:
对于老旧电缆，若本体的最大局部放电量s小于等于100pC，则本体状态正常，否则本体状态异常；若接头的最大局部放电量s小于等于300pC，则接头状态正常，否则接头状态异常；若终端的最大局部放电量s小于等于3000pC，则终端状态正常，否则终端状态异常。For old cables, if the maximum partial discharge s of the main body is less than or equal to 100pC, the main body is in normal state, otherwise the main body state is abnormal; if the maximum partial discharge s of the joint is less than or equal to 300pC, the joint state is normal, otherwise the joint state is abnormal; if If the maximum partial discharge capacity s of the terminal is less than or equal to 3000pC, the terminal state is normal, otherwise the terminal state is abnormal.
本发明具有以下优点：The present invention has the following advantages:
本发明借鉴机械可靠性领域常用的“应力-强度干涉模型”，利用现场实测的故障电缆的局放数据计算一定局放量下电缆局部放电缺陷的故障指标，提出一种更加准确的缺陷严重程度测算技术，从而使得状态评估结果能够以“故障指标”为表征参数而更加准确、定量，同时根据故障指标得出的配电电缆局放检测判据实现了在可靠性与运检成本中的科学、合理的平衡选择。The present invention draws on the commonly used "stress-strength interference model" in the field of mechanical reliability, uses field measured partial discharge data of faulty cables to calculate the fault index of cable partial discharge defects under a certain partial discharge, and proposes a more accurate defect severity measurement technology, so that the state assessment results can be more accurate and quantitative by using the "fault index" as the characterization parameter, and at the same time, the distribution cable partial discharge detection criterion obtained according to the fault index realizes the scientific and cost-effectiveness in reliability and operation inspection cost. Reasonably balanced choice.
本发明的其它特征和优点将在随后的说明书中阐述。Additional features and advantages of the invention will be set forth in the description which follows.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为本发明实施例中一种基于局部放电的配电电缆状态检测方法的流程图。Fig. 1 is a flow chart of a method for detecting the state of a distribution cable based on partial discharge in an embodiment of the present invention.
图2为本发明实施例中应力-强度干涉关系的示意图。Fig. 2 is a schematic diagram of the stress-strength interference relationship in the embodiment of the present invention.
具体实施方式Detailed ways
以下将参考附图详细说明本公开的各种示例性实施例、特征和方面。另外，为了更好的说明本发明，在下文的具体实施例中给出了众多的具体细节。本领域技术人员应当理解，没有某些具体细节，本发明同样可以实施。在一些实例中，对于本领域技术人员熟知的手段未作详细描述，以便于凸显本发明的主旨。Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In addition, in order to better illustrate the present invention, numerous specific details are given in the following specific examples. It will be understood by those skilled in the art that the present invention may be practiced without certain of the specific details. In some instances, means known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.
参阅图1，本发明一实施例提出一种基于局部放电的配电电缆状态检测方法，包括如下步骤：Referring to Fig. 1, an embodiment of the present invention proposes a distribution cable state detection method based on partial discharge, including the following steps:
步骤S1、进行电缆局部放电检测试验得到局部放电数据；所述局部放电数据包括多个离散采样点的局部放电量s；Step S1, performing a cable partial discharge detection test to obtain partial discharge data; the partial discharge data includes partial discharge quantities s of multiple discrete sampling points;
步骤S2、对所述局部放电数据进行统计分析，拟合电缆应力的概率分布函数f(s)和电缆强度的概率分布函数h(s)；所述应力为电缆当前缺陷的最大放电量，所述强度为发生严重局放缺陷的电缆的最大局放量；Step S2, performing statistical analysis on the partial discharge data, fitting the probability distribution function f(s) of the cable stress and the probability distribution function h(s) of the cable strength; the stress is the maximum discharge capacity of the current defect of the cable, and the The strength mentioned above is the maximum partial discharge capacity of the cable with serious partial discharge defects;
具体而言，本实施例将应力-强度干涉模型应用于电路检测，“强度”为发生严重局放缺陷的电缆(处于寿命终结边缘)的最大局放量，表示电缆所能承受的最大局放量的水平，其概率分布用f(S)来表示；模型中的“应力”为当前缺陷的最大放电量，其概率分布用h(s)表示；发生严重局放缺陷的电缆的最大局放量近似服从对数正态分布，当前缺陷最大放电量也服从对数正态分布；如图2所示；p(s)曲线下的面积在数值上等于电缆的故障指标F；Specifically, in this embodiment, the stress-strength interference model is applied to circuit detection, and "strength" is the maximum PD amount of a cable (on the verge of end-of-life) in which serious PD defects occur, and represents the maximum PD amount that the cable can withstand level, its probability distribution is represented by f(S); the "stress" in the model is the maximum discharge capacity of the current defect, and its probability distribution is represented by h(s); the maximum PD capacity of a cable with severe PD defects approximately obeys The logarithmic normal distribution, the maximum discharge of the current defect also obeys the logarithmic normal distribution; as shown in Figure 2; the area under the p(s) curve is numerically equal to the fault index F of the cable;
具体地，所述电缆强度的概率分布函数h(s)为：Specifically, the probability distribution function h(s) of the cable strength is:
所述电缆应力的概率分布函数f(s)为：The probability distribution function f(s) of the cable stress is:
其中，通过对所述局部放电数据进行统计分析，可以得到参数μ1、σ1、μ2、σ2。Wherein, the parameters μ 1 , σ 1 , μ 2 , and σ 2 can be obtained by statistically analyzing the partial discharge data.
步骤S3、根据所述局部放电数据、所述概率分布函数f(s)和概率分布函数h(s)计算故障指标F；Step S3, calculating the fault index F according to the partial discharge data, the probability distribution function f(s) and the probability distribution function h(s);
具体地，根据所述局部放电数据以及公式
步骤S4、根据所述故障指标F反推最大局部放电量s；Step S4, inversely calculating the maximum partial discharge amount s according to the fault index F;
具体地，根据公式
步骤S5、根据所述最大局部放电量s与预设阈值的比较结果确定电缆状态。Step S5. Determine the cable state according to the comparison result of the maximum partial discharge s and a preset threshold.
对于普通电缆，若本体的最大局部放电量s小于等于100pC，则本体状态正常，否则本体状态异常；若接头的最大局部放电量s小于等于200pC，则接头状态正常，否则接头状态异常；若终端的最大局部放电量s小于等于2000pC，则终端状态正常，否则终端状态异常。For ordinary cables, if the maximum partial discharge s of the main body is less than or equal to 100pC, the main body is in normal state, otherwise the main body state is abnormal; if the maximum partial discharge s of the joint is less than or equal to 200pC, the joint is in normal state, otherwise the joint state is abnormal; if the terminal If the maximum partial discharge capacity s is less than or equal to 2000pC, the terminal state is normal, otherwise the terminal state is abnormal.
对于老旧电缆，若本体的最大局部放电量s小于等于100pC，则本体状态正常，否则本体状态异常；若接头的最大局部放电量s小于等于300pC，则接头状态正常，否则接头状态异常；若终端的最大局部放电量s小于等于3000pC，则终端状态正常，否则终端状态异常。For old cables, if the maximum partial discharge s of the main body is less than or equal to 100pC, the main body is in normal state, otherwise the main body state is abnormal; if the maximum partial discharge s of the joint is less than or equal to 300pC, the joint state is normal, otherwise the joint state is abnormal; if If the maximum partial discharge capacity s of the terminal is less than or equal to 3000pC, the terminal state is normal, otherwise the terminal state is abnormal.
需说明的是，步骤S1进行电缆局部放电检测试验过程中得到的相关局部放电量s不是连续值，本发明实施例中通过尽可能多的样本点来拟合出概率密度分布函数，因而步骤S3求出的F也不是连续的，故此，需要根据步骤S3求得的F以及公式
以上已经描述了本发明的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场中的技术改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。Having described various embodiments of the present invention, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principle of each embodiment, practical application or technical improvement in the market, or to enable other ordinary skilled in the art to understand each embodiment disclosed herein.
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