不平衡样本数据下电缆缺陷时域诊断特征波形  

Time domain diagnostic characteristic waveform of cable defects under imbalanced sample data

作　　者：熊力 魏云彬 XIONG Li;WEI Yunbin(Zhongshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Zhongshan 528400,China)

机构地区：[1]广东电网有限责任公司中山供电局,广东中山528400

出　　处：《电子设计工程》2024年第24期95-99,共5页Electronic Design Engineering

基　　金：南方电网科技项目(032000KK52190148)。

摘　　要：电缆缺陷是局部放电量过大的主要原因,为有效控制局部放电量,维持电力网络的运行稳定性,在不平衡样本数据下提出电缆缺陷时域诊断特征波形识别方法。在不平衡样本数据的支持下,引入线性时域诊断特征确定与时域诊断特征相关的映射条件,完成对电缆缺陷时域诊断特征的提取。对已提取诊断特征波形进行变换处理,通过计算熵阈值指标的方式,完成不平衡样本数据下的电缆缺陷时域诊断特征波形识别。实验结果表明,应用所提方法后,可将由电缆缺陷引起的局部放电量控制在4.18×109 kW下,有效解决了局部放电量过大的问题,在维持电力网络运行稳定性方面具有突出作用价值。Cable defects are the main cause of excessive partial discharge.In order to effectively control partial discharge and maintain the stability of power network operation,a method of identifying the characteristic waveform of cable defects in time domain diagnosis is proposed based on imbalanced sample data.Supported by imbalanced sample data,linear time-domain diagnostic features are introduced to determine mapping conditions related to time-domain diagnostic features,and the extraction of time-domain diagnostic features for cable defects is completed.Transform the extracted diagnostic feature waveform and complete the time-domain diagnostic feature waveform recognition of cable defects under imbalanced sample data by calculating the entropy threshold index.The experimental results show that the proposed method can control the partial discharge caused by cable defects under 4.18×109 kW,effectively solve the problem of excessive partial discharge,and has outstanding value in maintaining the stability of power network operation.

关 键 词：不平衡样本数据 电缆缺陷 时域诊断 特征波形 局部放电量 

分 类 号：TN04[电子电信—物理电子学]