摘 要
随着电力系统规模的不断扩大和电压等级的逐步提高，电气设备的安全稳定运行对整个电力系统的可靠性和稳定性至关重要，而局部放电是导致电气设备绝缘性能下降的重要因素之一。为此，本研究旨在深入探讨电气设备中局部放电检测技术，以实现对局部放电的有效监测与预警。基于此目的，本文综合运用多种先进的信号处理技术和模式识别算法，提出了一种融合超声波法、脉冲电流法以及特高频法的多参量联合检测方法，该方法能够克服单一方法存在的局限性，有效提高局部放电检测的准确性和灵敏度。通过搭建实验平台并开展大量实验验证，结果表明所提出的多参量联合检测方法可以准确区分不同类型电气设备内部发生的局部放电现象，并且对于微弱局部放电信号也具有良好的检测效果。此外，还建立了局部放电特征数据库，为后续深入分析提供了数据支撑。本研究不仅为电气设备的状态评估和故障诊断提供了新的思路和技术手段，而且在实际工程应用中具有较高的实用价值，有助于保障电力系统的安全稳定运行。
关键词：局部放电检测 多参量联合检测 超声波法
Abstract
As the scale of power systems continues to expand and voltage levels gradually increase, the safe and stable operation of electrical equipment has become critical for the reliability and stability of the entire power system. Partial discharge is one of the key factors leading to the degradation of insulation performance in electrical equipment. To address this issue, this study aims to explore partial discharge detection technologies in electrical equipment to achieve effective monitoring and early warning of partial discharges. For this purpose, a multi-parameter joint detection method that integrates ultrasonic methods, pulse current methods, and ultra-high frequency methods is proposed, utilizing advanced signal processing techniques and pattern recognition algorithms. This approach overcomes the limitations of single-method detection, significantly improving the accuracy and sensitivity of partial discharge detection. Extensive experimental validation on a specially constructed platform demonstrates that the proposed multi-parameter joint detection method can accurately differentiate various types of partial discharges occurring within different electrical equipment and exhibits excellent detection performance even for weak partial discharge signals. Additionally, a partial discharge feature database has been established, providing data support for subsequent in-depth analysis. This research not only offers new ideas and technical means for the condition assessment and fault diagnosis of electrical equipment but also holds significant practical value in real-world engineering applications, contributing to the safe and stable operation of power systems.
Keyword:Partial Discharge Detection Multi-parameter Joint Detection Ultrasonic Method
目 录
1绪论 1
1.1研究背景与意义 1
1.2国内外研究现状 1
1.3本文研究方法 1
2局部放电检测原理 2
2.1局部放电物理机制 2
2.2检测信号特征分析 3
2.3常用检测方法综述 3
3检测技术与设备 4
3.1传感器技术发展 4
3.2数据采集系统设计 4
3.3在线监测系统实现 5
4工程应用与案例分析 6
4.1变压器局部放电检测 6
4.3检测结果评估方法 7
结论 8
参考文献 9
致谢 10
