基于Durbin Watson和Pearson对电流信号的相似性指数的数字保护方案实际上适用于功率变压器
1Department of Electrical Power and Machines Engineering (PME), College of Engineering Science & Technology, Misr University for Science and Technology (MUST), 6th of October City, Giza, Egypt. ragab.mahmoud@must.edu.eg.
Scientific reports
|April 10, 2025
概括
本研究引入了一种新的数值保护技术,使用德宾-沃森 (DW) 因子来检测电气故障并评估三相电力变压器中的电流失衡. 该方法实现了高精度和快速响应,以增强电力系统保护.
科学领域:
- 电气工程 电气工程
- 电力系统保护保护 电力系统保护
- 数字分析 数字分析
背景情况:
- 电气故障显著降低了电力系统中的电力质量.
- 准确和快速的故障检测对于功率变压器保护至关重要.
- 现有的方法可能难以区分各种故障类型和电流失衡.
研究的目的:
- 提出一种新的数值保护技术,用于检测故障和评估三相功率变压器电流中的不平衡.
- 整合德宾-沃森 (DW) 因素和皮尔森相似性算法,以加强故障识别.
- 在实际的三相电力变压器设置中评估该方案的有效性.
主要方法:
- 开发了一个集成德宾-沃森 (DW) 和皮尔森相似算法的保护方案.
- 使用模拟数字转换器和LABVIEW软件进行数据处理.
- 在一个三相功率变压器上进行了全面的测试,该变压器具有触摸式绕线和三相负载.
主要成果:
- 实现了大约99%的安全性,可靠性和精度比率.
- 在单个功率频率周期内表现出快速响应,即使有轻故障电流.
- 成功地区分了平衡和不平衡的电流,并确定了各种故障类型 (转向转向,绕向中性,绕向绕向).
结论:
- 拟议的数值保护方案对于三相变压器来说是非常有效,安全和可靠的.
- 这种技术提供了对声绕线的坚固性,并提供了保护冗余.
- 它准确评估故障严重程度,并选择性地运行,在正常条件下保持不活跃.
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