Moisture content is a fundamental physical index that quantifies soil property and is closely associatedwith the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisturecontents, a ...Moisture content is a fundamental physical index that quantifies soil property and is closely associatedwith the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisturecontents, a distributed measurement system for in-situ soil moisture content （SM-DTS） is introduced.The system is based on carbon-fiber heated cable （CFHC） technology that has been developed to enhancethe measuring accuracy of in-situ soil moisture content. Using CFHC technique, a temperature characteristicvalue （Tt） can be defined from temperatureetime curves. A relationship among Tt, soil thermalimpedance coefficient and soil moisture content is then established in laboratory. The feasibility of theSM-DTS technology to provide distributed measurements of in-situ soil moisture content is verifiedthrough field tests. The research reported herein indicates that the proposed SM-DTS is capable ofmeasuring in-situ soil moisture content over long distances and large areas.展开更多
零值绝缘子威胁输电线路安全稳定运行。通过光纤电场检测方式可以获得绝缘子串局部电场分布,从而识别零值片。设计了一款光纤电场检测履带机器人,并为分析其在检测过程中可能产生的误差和影响,提出识别判据,建立了220 k V绝缘子串真型...零值绝缘子威胁输电线路安全稳定运行。通过光纤电场检测方式可以获得绝缘子串局部电场分布,从而识别零值片。设计了一款光纤电场检测履带机器人,并为分析其在检测过程中可能产生的误差和影响,提出识别判据,建立了220 k V绝缘子串真型模型以及检测机器人等效模型,仿真分析了机器人构架在绝缘子串不同位置时的电场分布特性,并且研究了机器人材质、位置、尺寸等因素对局部电场畸变特征的影响,尤其是零值和非零值情况下的局部电场变化规律。研究结果揭示了光纤电场检测机器人对零值绝缘子局部电场畸变的影响,可为输配电外绝缘智慧运维提供技术支撑。展开更多
基金The financial supports provided by the National Natural Science Foundation of China(Grant Nos.41230636,41372265,41427801)National Basic Research Program of China(973 Project)(Grant No.2011CB710605)
文摘Moisture content is a fundamental physical index that quantifies soil property and is closely associatedwith the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisturecontents, a distributed measurement system for in-situ soil moisture content （SM-DTS） is introduced.The system is based on carbon-fiber heated cable （CFHC） technology that has been developed to enhancethe measuring accuracy of in-situ soil moisture content. Using CFHC technique, a temperature characteristicvalue （Tt） can be defined from temperatureetime curves. A relationship among Tt, soil thermalimpedance coefficient and soil moisture content is then established in laboratory. The feasibility of theSM-DTS technology to provide distributed measurements of in-situ soil moisture content is verifiedthrough field tests. The research reported herein indicates that the proposed SM-DTS is capable ofmeasuring in-situ soil moisture content over long distances and large areas.
文摘零值绝缘子威胁输电线路安全稳定运行。通过光纤电场检测方式可以获得绝缘子串局部电场分布,从而识别零值片。设计了一款光纤电场检测履带机器人,并为分析其在检测过程中可能产生的误差和影响,提出识别判据,建立了220 k V绝缘子串真型模型以及检测机器人等效模型,仿真分析了机器人构架在绝缘子串不同位置时的电场分布特性,并且研究了机器人材质、位置、尺寸等因素对局部电场畸变特征的影响,尤其是零值和非零值情况下的局部电场变化规律。研究结果揭示了光纤电场检测机器人对零值绝缘子局部电场畸变的影响,可为输配电外绝缘智慧运维提供技术支撑。
