基于局部放电的电力电缆状态监测技术研究

Research on Partial Discharge-Based Monitoring Technology of Power Cable Status

主要研究了基于局部放电电缆状态监测技术,指出电缆系统的健康状况对电网稳定性和安全性至关重要。分析了高压电缆运行故障的原因,如物理损伤、水分侵入和材料质量问题等。在局部放电原因分析部分,讨论了局部放电的形成机理,包括生产过程中的缺陷、长期运行中的绝缘老化以及外部因素如温度和湿度的影响。此外,还探讨了外施电压对局部放电出现可能性的影响。在局部放电监测方法分析中,介绍了几种常用的局放检测技术及其原理,如高频局放检测、特高频局放检测和超声波局放检测。这些技术对于识别和定位电缆中的局部放电现象至关重要,有助于及时发现潜在的绝缘缺陷并采取维护措施。通过分析现场采集的局放信号数据,结合历史测试数据,获取局放核心表征特征,为后续状态评估提供依据。

This paper mainly studies the partial discharge-based monitoring technology of cable status,pointing out that the health status of the cable system is crucial to the stability and safety of power grid.The paper first analyzes the causes for the operational faults of high-voltage cable,such as physical damage,moisture intrusion and material quality problems,and then,in the part of partial discharge cause analysis,discusses the formation mechanism of partial discharge,including defects in the production process,insulation aging in long-term operation and the influence of external factors such as temperature and humidity.In addition,the paper explores the influence of applied voltage on the partial discharge possibility,and in the analysis of partial discharge monitoring methods,introduces several commonly used partial discharge detection techniques and their principles,such as high-frequency partial discharge detection,ultra-high frequency partial discharge detection,and ultrasonic partial discharge detection.These technologies are crucial for identifying and locating partial discharge phenomena in cables,helping detect potential insulation defects and take maintenance measures in a timely manner.Finally,the paper analyzes the on-site collected partial discharge signal data and combines with historical test data to obtain the core characteristic features of partial discharge,thus providing a basis for the subsequent state evaluation.