Results 51 to 60 of about 177 (121)
Gaoya dianqi, 2022 不同类型的高压电缆局部放电（简称局放）模式识别是该领域的难题。部分电缆局放类型之间相似度较大，识别困难。针对该问题，文中提出了一种基于随机决策森林（RF）的高压电缆局放模式识别方法。首先，制作了5种高压电缆人工缺陷，结合IEC 60270—2015系统和高频电流互感器（HFCT）进行实验，获取局放数据，并进行局放特征提取。其次，介绍了随机森林算法的原理和基于随机森林的高压电缆局放模式识别流程。最后，基于实验所得数据开展了局放模式识别方法有效性验证，确定了随机森林每个节点处特征子集中特征个数、节点分裂规则、
刘文浩 +6 more
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Gaoya dianqi, 2012 为了研究直流输电系统中换流变压器油纸绝缘的局部放电特性,设计构造了典型的油纸局部放电模型———气隙放电模型。针对同一模型分别施以交流电压、直流电压以及冲击衰减振荡电压,采用IEC 60270-2000推荐的脉冲电流法分别检测与分析该模型局部放电的不同特征参数。对比研究了在交流、直流及振荡冲击电压下油纸绝缘气隙放电模型的局部放电脉冲特征参量包括局部放电起始电压、熄灭电压、放电波形、放电水平、放电重复率等,对实现换流变压器的局部放电在线监测与绝缘状态综合评估有一定的指导意义。
徐春社 +3 more
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Gaoya dianqi, 2014 局部放电激发的特高频信号大小与放电严重程度紧密相关,笔者利用220 kV GIS设备,采用特高频检测法和IEC 60270—2000检测法同时对多种典型局部放电源进行试验。通过分析特高频信号的时域峰峰幅值与局部放电量之间的关联,发现不同类型局部放电源所激发的特高频信号峰峰值与视在放电量的对应关系存在显著差异。针对不同局部放电源特有的物理结构,通过对放电机理的对比分析,给出了不同缺陷激发的特高频信号峰峰值与视在放电量关系不一致原因的定性解释。
丁登伟, 高文胜, 刘卫东
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EnergiesInsulation deterioration is the leading cause of premature failures in high-voltage (HV) power equipment, with partial discharge (PD) serving as a key indicator of insulation health.
Krishanlal Adhikari +4 more
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The Design, Fabrication, and Evaluation of a Phase-Resolved Partial Discharge Sensor Embedded in a MV-Class Bushing. [PDF]
Sensors (Basel), 2023 Lee GY, Kim NH, Kim DE, Kil GS, Kim SW.
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EnergiesGas-insulated switchgear (GIS) offers multiple advantages compared to air-insulated switchgear (AIS); primarily, due to its more compact design and reduced maintenance requirements. In recent years, environmentally friendly replacement gases for SF6 have
Niclas Dölzer +2 more
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IEEE AccessThis study comparatively examines the electrical degradation characteristics of MIDEL 7131, a synthetic ester-based eco-friendly insulating oil, against conventional mineral oil through laboratory-scale experiments.
Keon-Hee Park +3 more
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IEEE AccessReliable detection of partial discharges (PD) is essential for condition monitoring of high-voltage electrical equipment. In applications based on high-frequency current transformer (HFCT) sensors, the construction of phase-resolved partial discharge ...
Eleanor Dias De Sousa +4 more
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IEEE AccessPartial discharge (PD) is a major cause of insulation aging and failure in high-voltage equipment, such as gas-insulated switchgears and transformers.
Daeryeong Baek +2 more
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Use of DSLR and Sonic Cameras to Detect and Locate High-Voltage Corona Discharges. [PDF]
Sensors (Basel), 2022 Riba JR, Bas-Calopa P.
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