关键词： 双目视觉   高压变压器   安装点   三维定位技术  

摘要： 由于传统变压器安装点定位技术的精度较低,影响配网高质量运行及用电安全,提出基于双目视觉的高压变压器安装三维定位技术。通过双目摄像机成像模型采集变压器安装点双目图像,利用直方图均衡化增强双目图像,立体匹配双目图像计算视差信息,根据双目立体几何原理求得变压器安装定位点的三维位置。实验结果表明:所提技术的平均绝对距离误差为0.57,验证该技术具有较高定位精度,满足高压变压器安装定位需求。

关键词： 直流变压器  

ISBN: (纸本)9787111719519

摘要： 本书针对面向中压直流配电场景的高效高功率密度直流变压器技术，从拓扑结构、设计方法、控制策略与实际应用研究几个层面进行了系统阐述。本书共11章，除第1章绪论外，其余章节主要分为三个部分：第2-6章重点讨论了输入串联、输出并联型直流变压器的改进拓扑结构、工作原理、参数设计方法与控制策略，探索了直流变压器在运行效率、功率密度与故障处理能力方面的提升方法；第7-9章探讨了面向宽电压运行场景的基于高频链路结构的直流变压器改进方案，详细介绍了其工作原理、设计方法与控制策略；第10、11章则针对典型中压配电场合，重点讨论了直流变压器的硬件参数、控制策略以及大功率高频变压器的优化设计方法。

摘要： The use of electronic nicotine delivery systems (ENDS) is continuously increasing both in the United States and the world as a whole. The lung epithelial cells and resident immune cells have an important role in maintaining the protective surfactant in the lungs, while macrophages play an important role in the immune response. Moreover, the balance of cell death, phagocytosis, and integrity of immune cells are crucial for the ability to properly respond to infectious challenges. Exposure to ENDS aerosol is associated with several adverse conditions like EVALI. However, there are still significant knowledge gaps pertaining to the mechanism of toxicity of ENDS and a full range of toxic effects. The purpose of our research study was to investigate the effect of ENDS on primary macrophages and epithelial cells to add to the scientific knowledge on the mechanism of toxicity of ENDS aerosol. To investigate the nature of cell death and measure the toxic effect associated with exposure to ENDS, we will perform a controlled exposure of cells to the ENDS vapor, while treating the other group of cells with HEPA-filtered air. To collect the data, we will perform flow cytometry. Finally, for the toxicological perspective on the vape automizer itself, which is a key component of the structural piece of the ENDS, we will perform a series of exposure experiments, followed by flow cytometry analysis. Results indicate that longer ENDS aerosol exposure induces greater pyroptotic activity and overall cell death in the sample of BMDMs. Moreover, longer incubation post- exposure gives macrophages time to respond to ENDS aerosol leading to stronger cell death and pyroptosis. Additionally, data indicate that the length of atomizer use is directly correlated to the degree of adverse response at a cellular level. These findings give us a new perspective on ENDS-associated toxic effects and, with further research, could play a role in the development of public health campaigns and development

关键词： 变压器  

ISBN: (纸本)9787519872816

摘要： 本书基于声学振动检测原理，针对有载分接开关的缺陷故障，开展了有载分接开关缺陷故障物理模型构建及试验研究、振动信号特征识别技术、典型故障诊断方法和机械性能评估技术、典型振动特征数据库技术等方面的论述。

关键词： 耐火实验   消防   变压器天然酯绝缘油   变压器  

摘要： 天然酯绝缘油是一种环保的变压器用绝缘材料.本文主要对变压器直接更换天然酯绝缘油进行研究,提出其在电力生产中的应用,分析了需要解决的实际问题并探讨了可能的解决方法.

摘要： Remote sensing is regarded as a rich source of data that is still very valuable for mapping (classification) and monitoring of this information using various methodologies. Convolutional Neural Networks (CNNs) are frequently employed by researchers in this field as one of the key feature extraction approaches in application to satellite pictures and have achieved good performance and efficacy. Yet, they face some problems, including the overfitting problem and the need for large datasets and expensive computational resources. As a result, it would be a good idea to experiment with various Deep Learning methods, investigate them, and compare them to existing methods while taking into account all of the elements that can affect the processing. Transformers, particularly vision Transformers, have just been offered as novel Deep Learning approaches and have demonstrated good performance in a variety of domains. Hence, experimenting with these new models would be a realistic strategy in terms of learning how they behave when processing data and what value they can contribute to the picture classification area. In relation with this, the present work aims to analyze the performance of different DL methods in classifying different land cover/land use types depending on their properties and the effect of the revolution level on this. Experimental results conducted on two main datasets "EuroSAT" and "UC Merced" indicates that some CNNs, such as, "ResNET50" and "EfficientNET B0" perform well with different resolutions while for "VGG16" and the Vision Transformer, the need for a huge amount of data for the learning task is unavoidable.

关键词： 变电所   干式变压器   噪声分析   减振降噪  

摘要： 绝大多数民用建筑的变电所安排在地下车库中,其内部干式变压器的噪声与震动会影响到租户与业主的正常生活。干式变压器在运行过程中,很容易产生噪声,所以需要加以改进与控制。本文阐述了干式变压器噪声形成的重要原因,同时提出变电所干式变压器的减震降噪处理对策、解决案例、实施情况等内容,从而有效降低干式变压器所产生的噪声,控制噪声的环境污染。

关键词： 特高压换流变压器   分布电容   移相作用   励磁阻抗  

摘要： 本文中作者介绍了一台±800kV特高压换流变压器介损测试数据异常的案例,发现不同的接线方式对现场介损测量结果有很大影响,分析并得出了移相作用和二次侧短接与否是造成测试结果异常的主要原因。

关键词： 变压器保护   励磁涌流   匝间短路   二次谐波分量   衰减特性  

摘要： 变压器空载合闸时将产生大的励磁涌流,受剩磁、合闸角、变压器参数等因素影响,涌流特性复杂,辨识困难。这一现象在包含变压器匝间短路场景下,体现尤为明显。目前尚缺少考虑匝间短路因素下励磁涌流特性的数学表征和辨识判据。本文笔者提出了一种基于二次谐波分量衰减特性的励磁涌流表征方法,采用基于变压器二次谐波分量与基波分量幅值比的涌流判定依据,可实现包含匝间短路等多场景下励磁涌流的快速辨识。