POWRE: Wavelet Decomposition of Inrush and Arc Currents

电力变压器对大电流（即电弧电流）的保护通常基于差动继电器。这些继电器用于20mva及以上的变压器，约占该国配电变压器的40%。这些变压器的保护很重要，因为更换这样的变压器的成本是每千伏安1-5美元。虽然这些继电器确实提供保护，但在应用中存在很大的困难。本研究的目的是开发一种新的、复杂的基于小波的信号处理算法，以一种不受浪涌电流影响的快速检测方式可靠地检测内部故障。简要回顾了小波的理论，并给出了一些初步的仿真结果。结果表明，小波与特定时频瓦片中所含的百分比能量一起，显示了手头任务的希望。拟议的研究分为两个主要阶段。第一阶段是开发区分浪涌和电弧电流的算法。第二阶段是原型系统的设计和测试，该系统将以尽可能接近工业设置的方式实现第一阶段开发的算法。PI计划将她在材料和信号处理领域的优势和专业知识带入电力系统，这可以从她的知识中受益。power拨款将提供必要的设备、用品和时间，以帮助PI专注于她的新研究事业

ECS-9870456 Nicoletti Protection for power transformers against large currents, known as arc currents, is commonly based on differential relays. These relays are used on transformers of the size 20 MVA and up, which accounts for approximately 40% of the transformers used in electricity distribution in this country. The protection of these transformers is important because the cost of replacing such a transformer is $1-5 per kVA. While these relays do offer protection, there are substantial difficulties in application. The aim of this research to is to develop a new and sophisticated signal processing algorithm based on wavelets that will reliably detect internal faults in a way that will provide rapid detection not effected by inrush currents. A brief review of the theory of wavelets is provided along with some preliminary results of simulations. It is shown that wavelets, along with percentage energy contained in certain time-frequency tiles, show promise for the task at hand. The proposed research has two major phases. Phase I is the development of algorithms that will distinguish inrush versus arc currents. Phase II is the design and testing of a prototype system that will implement the algorithms developed in Phase I in a way that is as close to the industrial set-up as possible. The PI plans to bring her strengths and expertise from the materials and signal processing areas into the electrical power systems which can benefit from her knowledge. A POWRE grant will provide the essential equipment, supplies and time to help keep the PI focused in her new research ventures