Results 51 to 60 of about 95 (94)

基于随机决策森林的高压电缆局部放电模式识别

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, 吴毅江, 李文泽, 王洪雨, Ashfaque Ahmed Bhatti, 彭小圣, 何顺姬   +6 more
doaj  

油纸绝缘气隙模型局部放电特性试验研究

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, 孙振权, 赵学风, 李彦明   +3 more
doaj  

Guided Ultrasound Horn-Enhanced Fiber Bragg Grating Sensor for Partial Discharge Detection in HV Equipment

Energies
Insulation 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, Chiranjib Koley, Nirmal Kumar Roy, Aashish Kumar Bohre, Akshay Kumar Saha   +4 more
doaj   +1 more source

Graph-Based Framework with Waveform-Informed Connectivity for Multi-Label Partial Discharge Source-Type Classification

Sensors
Partial discharge (PD) source-type classification is essential for condition-based maintenance of high-voltage apparatus. Existing approaches based on grid discretizations of phase-resolved partial discharge (PRPD) patterns suffer from performance ...
Leandro José Duarte, Andréia Coelho Domingos, Alan Petrônio Pinheiro, Lorenço Santos Vasconcelos, Fabrício Augusto Matheus Moura, Fernando Elias de Freitas Fadel, Patrícia Naomi Sakai   +6 more
doaj   +1 more source

Analysis of the deterioration process of DC XLPE cable with protrusion defect based on the development of partial discharge.

PLoS ONE
High-voltage direct current (HVDC) cables are essential for long-distance power transmission, particularly in renewable energy applications. Cross-linked polyethylene (XLPE) insulation is commonly used in these cables, but protrusion defects that occur ...
Yunjie Zhou, Shuting Yang, Jiamin Xu, Haosheng Lv, Jialiang Yuan, Baiyu Li   +5 more
doaj   +1 more source

Partial Discharge Behavior of Natural Origin Gases Depending on Gas Pressure and Electric Field Homogeneity

Energies
Gas-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, Michael Beltle, Stefan Tenbohlen   +2 more
doaj   +1 more source

Experimental Analysis of Electrical Degradation in Eco-Friendly Insulating Oil Using a Scaled-Down Transformer Internal Structure

IEEE Access
This 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, Se-Hee Park, Chul-Sang Hwang, Young-Woo Youn   +3 more
doaj   +1 more source

Partial Discharge Severity Classification for Transformer Condition Monitoring Using Feature Engineering, PCA, and ANN

Machines
Partial discharge (PD) is a key indicator of insulation degradation in high-voltage transformers and can provide early warning of incipient failure. Although artificial neural networks (ANNs) have been applied to PD classification, their performance may ...
Lucas Thobejane, Bonginkosi A. Thango
doaj   +1 more source

Dynamic Severity Assessment of Partial Discharge in HV Bushings Based on the Evolution Characteristics of Dense Clusters in PRPD Patterns

Sensors
High-voltage bushings are critical insulation components, yet conventional PRPD-based severity assessment methods that rely on global pattern morphologies such as “rabbit ears” and “tortoise shell” remain coarse, lack local sensitivity, and fail to track
Xiang Gao, Zhiyu Li, Zuoming Xu, Pengbo Yin, Xiongjie Xie, Xiaochen Yang, Baoquan Wan   +6 more
doaj   +1 more source

An Automated CNN–BiLSTM Pipeline for Online Detection of Partial Discharge Pulses From HFCT Measurements With PRPD-Based Experimental Validation

IEEE Access
Reliable 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, Marcel Antonionni De Andrade Romano, Andre Melo De Morais, Marcus Vinnicius Alves Nunes, Ubiratan Holanda Bezerra   +4 more
doaj   +1 more source