750 kV同塔双回输电线路中感应电压、感应电流的研究以及接地开关的选取

同塔双回输电线路中,当一回线路正常运行、另一回线路停电检修时,由于2回输电线路间的静电感应和电磁感应作用,在检修回路中会产生感应电压和感应电流.为确保运行检修时的可靠性和安全性,要求线路上采用的接地开关必须具有开合感应电流的能力.推导了接地开关在4种工况下感应电压和感应电流的大小,利用EMTP计算了750 kV电压等级同塔双回线路的感应电压和感应电流以及开关接地时所产生的瞬态恢复电压(TRV)的大小,为750 kV电压等级接地开关的选型提供了依据.     

深度强化学习在多传感器融合下的无人机视觉感知巡检中的应用

文中利用深度强化学习,实现了基于视觉感知的无人机全光谱自主巡检功能。在全光谱巡检系统技术部分,详细介绍了多传感器融合的数学模型和公式,并深入探讨了卷积神经网络（CNN）在目标检测中的应用,提出了一种基于特征金字塔网络（FPN）的多尺度目标识别方法。最后,进一步阐述了无人机云台相机的稳定性控制方法,包括PID控制器,并分析了如何将目标检测结果与飞行控制系统相结合,实现自动化的云台相机联动拍摄技术。通过对实验结果的分析,深入讨论了各项技术的优劣势,并提出了改进方向,为未来实现无人机自主巡检提供了参考,为实现高效、精准的工程巡检提供了新的技术路径。     

Experimental investigation of thermal transfer coefficient by a simplified energy balance of fault arc in a closed air vessel

The themial transfer coefficient that represents the portion of energy heating the surrounding gas of fault arc is a key parameter in evaluating the pressure effects due to fault arcing in a closed electrical installation.This paper presents experimental research on the thermal transfer coefficient in a closed air vessel for Cu,Fe and A1 electrode materials over a currcni range from 1-20 kA with an electrode gap from 10-50 mm and gas pressure from 0.05-0.4 MPa.With a simplified energy balance including Joule heating,arc radiation,ihc energies related to electrode melting,vaporization and oxidation constructed,and the influences of different factors on thermal transfer coefficient are studied and evaluated.This quantitative estimation of the energy components confirmed that the pressure rise is closely related to the change in heat transport process of fault arc.particularly in consideration of the evaluation of Joule healing and radiation.Factors such as the electrode material,arc current,filling pressure and gap length between electrodes have a considerable effect on the thermal transfer coefficient and thus,the pressure rise due to the differences in the energy balance of fault arc.