The computer vision technology based on deep learning provides a new perspective on equipment inspection in power system. The intelligent technologies are now widely used in substations and definitely achieve positive effects, but they also face the problem of poor accuracy due to small samples. To improve the defect recognition in substations, this paper presents an improved YOLOv7 model that additionally includes the domain adaptation module, the SimAM attention module and the auxiliary detection head. The domain adaptation module strengthens the domain invariant features to improve the adaptability to unknown data. The SimAM attention module focuses on the key area and the objects. The auxiliary detection head can reduce the influence of large differences in object scale. The experiments on real-world data demonstrate that the improved model can better deal with the small samples and achieve better performance in the detection rate and the error rate.

在电厂及变电站基扩建工程建成投运前,需对电流互感器变比、极性及接线进行检查,为避免负荷测试和一次通流试验交替多次试验,提高工作效率,本文设计了具有无线同步二次电压源的一次升流装置,可实现系统启动前CT变比极性和接线的准确判断和保护装置的带负荷工作测试.为满足现场一、二次之间距离要求、二次电压源同步跟随一次电流的频率和相位的同步要求,采用无线、有线方式来保证同步性,适用不同情况下为保护装置提供所需的同步电压,且相位可调.装置设计完成后进行了性能试验,效果良好.

变电站二次设备验收周期较长,现有的验收方法存在遗漏或多组重复验收的情况,影响二次验收质量,本文针对变电站二次设备回路全检式辅助验收方法展开研究.基于变电站二次设备回路全检式辅助验收项目,制定二次设备的验收流程,并设计二次设备全检式辅助验收小程序,显示设备验收结果,实现全检式辅助验收.实验结果表明,设计方法下的变电站二次设备回路全检式辅助验收结果与实际情况相符,证实了该方法的合理性.

本文研究了一种互感器二次回路测试装置,通过无线通信实现三个单相电压电流源和一个测试终端的多点同步输出和测量,同步进行多个电压、电流互感器二次回路接线的极性、变比、相序、通断的核对,结果可通过高分辨率人机交互界面以表格、向量图等直观显示.