The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform

Xu Luwen - One of the best experts on this subject based on the ideXlab platform.

  • Simulation Analysis on Power Frequency Electric Field at Ground Surface Near EHV Power Transmission Tower
    Power system technology, 2013
    Co-Authors: Xu Luwen
    Abstract:

    Based on actual structure of Power Transmission tower and parabolic equation of Transmission lines,a three-dimensional model to compute Power frequency electric field at ground surface near Transmission tower is built.According to charge simulation method,the distribution of Power frequency electric field at ground surface near 500kV Transmission tower as well as the impacts of Transmission tower on nearby electric field is analyzed,and the factors impacting computational results of electric field are discussed.Research results show that there is a certain screening effect of Transmission tower on ground surface electric field nearby the tower,so the electric field intensity beneath the tower decreases obviously and electric field distortion appears at the positions where metal frameworks are erected.The impacting area is related to the height of the tower and the size of tower foundation;computational result of electric field will be impacted by the equivalent radius of tower framework,the number of line segments and different simplified models of the tower.

Hongguang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Human-Robot Interaction System Research for 500kV EHV Power Transmission Line Inspection Robot
    Advanced Engineering Forum, 2011
    Co-Authors: Wei Bin Guo, Hongguang Wang, Peng Sun, Lie Ling
    Abstract:

    An assisted and secure interaction system is developed for 500kV EHV Power Transmission Line Inspection Robot. The challenges on amenity, assistance and security of interactive operation are emphasized. Due to the unpredictable line structure and the incomplete sensory, the robot is controlled in remote and locally autonomous mode. Based on the Finite State Machine (FSM), the automatic crossing interface is designed for protecting operators from memorizing redundancy sequences. Measures for friendly operating and avoiding errors are concerned. The architectures for fully autonomous are also engaged. The lab and field experiments validated the interaction system reliable and easy to use.

  • development of an inspection robot for 500 kv EHV Power Transmission lines
    Intelligent Robots and Systems, 2010
    Co-Authors: Hongguang Wang, Fei Zhang, Yong Jiang, Guangjun Liu, Xiaojie Peng
    Abstract:

    The developments in mobile robotics have increasingly played an important role in the inspection and maintenance work of Power Transmission Lines (PTLs). This paper presents the research and development of the inspection robots for 500kV PTLs in Shenyang Institute of Automation, Chinese Academy of Sciences (SIACAS). An overview of the research work and the development of an inspection robot AApe-B, are introduced, respectively. The AApe-B can run on the Overhead Ground Wires (OGWs) and navigate different types of obstacles in remote and locally autonomous control mode. A novel dual-wheel-arm hybrid mechanism with the excellent locomotion and obstacle-navigation performance is designed, and obstacle navigation process is analyzed. An embedded control system which can withstand the strong electromagnetic interference has been developed. A lot of field experiments have been carried out, and the experimental results have shown that the inspection robot can reliably work during the 500kV Extra High Voltage (EHV) electromagnetic environment and possess the primary ability to implement the inspection task of the 500kV PTLs.

  • IROS - Development of an inspection robot for 500 kV EHV Power Transmission lines
    2010 IEEE RSJ International Conference on Intelligent Robots and Systems, 2010
    Co-Authors: Hongguang Wang, Fei Zhang, Yong Jiang, Guangjun Liu, Xiaojie Peng
    Abstract:

    The developments in mobile robotics have increasingly played an important role in the inspection and maintenance work of Power Transmission Lines (PTLs). This paper presents the research and development of the inspection robots for 500kV PTLs in Shenyang Institute of Automation, Chinese Academy of Sciences (SIACAS). An overview of the research work and the development of an inspection robot AApe-B, are introduced, respectively. The AApe-B can run on the Overhead Ground Wires (OGWs) and navigate different types of obstacles in remote and locally autonomous control mode. A novel dual-wheel-arm hybrid mechanism with the excellent locomotion and obstacle-navigation performance is designed, and obstacle navigation process is analyzed. An embedded control system which can withstand the strong electromagnetic interference has been developed. A lot of field experiments have been carried out, and the experimental results have shown that the inspection robot can reliably work during the 500kV Extra High Voltage (EHV) electromagnetic environment and possess the primary ability to implement the inspection task of the 500kV PTLs.

  • research on obstacle navigation control of a mobile robot for inspection of the Power Transmission lines based on expert system
    CLAWAR, 2006
    Co-Authors: Ludan Wang, Hongguang Wang, Lijin Fang, Mingyang Zhao
    Abstract:

    This paper presents an obstacle-navigation control strategy for a mobile robot suspended on overhead ground wires of 500Kv extra-high voltage (EHV) Power Transmission lines, based on a novel movement mechanism. The control system of the mobile robot is based on a hybrid architecture expert system, which is mainly composed of a knowledge base and inference engine and can be applied to obstacle-navigation autonomously. In the control system, environment state data and fuzzified obstacle-data are input to the expert system so that the process of obstacle-navigation can be generated. Hence, joints variables can be calculated by solving the robot kinematics equations. According to the obstacle-navigation process and the calculated joints variables, the controller drives the motor rotations and the robot can overcome the obstacles.

  • CLAWAR - Research on Obstacle-navigation Control of a Mobile Robot for Inspection of the Power Transmission Lines Based on Expert System
    Climbing and Walking Robots, 2006
    Co-Authors: Ludan Wang, Hongguang Wang, Lijin Fang, Mingyang Zhao
    Abstract:

    This paper presents an obstacle-navigation control strategy for a mobile robot suspended on overhead ground wires of 500Kv extra-high voltage (EHV) Power Transmission lines, based on a novel movement mechanism. The control system of the mobile robot is based on a hybrid architecture expert system, which is mainly composed of a knowledge base and inference engine and can be applied to obstacle-navigation autonomously. In the control system, environment state data and fuzzified obstacle-data are input to the expert system so that the process of obstacle-navigation can be generated. Hence, joints variables can be calculated by solving the robot kinematics equations. According to the obstacle-navigation process and the calculated joints variables, the controller drives the motor rotations and the robot can overcome the obstacles.

Liu Bei - One of the best experts on this subject based on the ideXlab platform.

  • Analysis on DC Component in Short-Circuit Current of Power Grid and Its Influence on Breaking Ability of Circuit Breakers
    Power system technology, 2012
    Co-Authors: Liu Bei
    Abstract:

    There are two main components in short-circuit current of Power system,i.e.,the periodical component and direct current(DC) component,however in engineering application there is no special attention paid to the latter.The attenuation of DC component of short-circuit current in EHV Power Transmission network is presented in two aspects,namely simulation and actual recorded fault data,and the influence of DC component on breaking ability of circuit breakers being operated.Finally,the breaking ability and making capability of circuit breakers being operated are synthetically evaluated,and following conclusion are obtained: if the breaking ability of circuit breaker is checked by periodical component in short-circuit current,it is necessary to keep out the margin of breaking ability in the range from 10% to 30% to take possibly existing DC component in the fault current to be switched off;as for the circuit breaker being operated in limited operation mode,the breaking ability of circuit breaker to be considered is its rated breaking capacity,but not the making capability.

Mingyang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • research on obstacle navigation control of a mobile robot for inspection of the Power Transmission lines based on expert system
    CLAWAR, 2006
    Co-Authors: Ludan Wang, Hongguang Wang, Lijin Fang, Mingyang Zhao
    Abstract:

    This paper presents an obstacle-navigation control strategy for a mobile robot suspended on overhead ground wires of 500Kv extra-high voltage (EHV) Power Transmission lines, based on a novel movement mechanism. The control system of the mobile robot is based on a hybrid architecture expert system, which is mainly composed of a knowledge base and inference engine and can be applied to obstacle-navigation autonomously. In the control system, environment state data and fuzzified obstacle-data are input to the expert system so that the process of obstacle-navigation can be generated. Hence, joints variables can be calculated by solving the robot kinematics equations. According to the obstacle-navigation process and the calculated joints variables, the controller drives the motor rotations and the robot can overcome the obstacles.

  • CLAWAR - Research on Obstacle-navigation Control of a Mobile Robot for Inspection of the Power Transmission Lines Based on Expert System
    Climbing and Walking Robots, 2006
    Co-Authors: Ludan Wang, Hongguang Wang, Lijin Fang, Mingyang Zhao
    Abstract:

    This paper presents an obstacle-navigation control strategy for a mobile robot suspended on overhead ground wires of 500Kv extra-high voltage (EHV) Power Transmission lines, based on a novel movement mechanism. The control system of the mobile robot is based on a hybrid architecture expert system, which is mainly composed of a knowledge base and inference engine and can be applied to obstacle-navigation autonomously. In the control system, environment state data and fuzzified obstacle-data are input to the expert system so that the process of obstacle-navigation can be generated. Hence, joints variables can be calculated by solving the robot kinematics equations. According to the obstacle-navigation process and the calculated joints variables, the controller drives the motor rotations and the robot can overcome the obstacles.

  • ICARCV - An Autonomous Obstacles Negotiating Inspection Robot for Extra-High Voltage Power Transmission Lines
    2006 9th International Conference on Control Automation Robotics and Vision, 2006
    Co-Authors: Xinglong Zhu, Hongguang Wang, Lijin Fang, Jiping Zhou, Mingyang Zhao
    Abstract:

    The purpose of inspection tasks for Power Transmission lines is to check running state and find damages of extra-high voltage (EHV) Power Transmission lines equipment. Obviously, inspection tasks are very important for normal operation of Power Transmission lines. So far, there are two methods for checking Power Transmission lines. One method is that Power Transmission line equipment has been checked manually by workers with a telescope on the ground. Another method is that Power Transmission line equipment has been inspected by helicopter with the checking devices which are thermal infrared imager, visible light camera and so on. After inspection robot configuration is described, the centroid adjustment principle of inspection robot is introduced. Then the control strategy of inspection robot is investigated. From the experiments, we find that the centriod adjustment method proposed and the control strategy presented is feasible.

Thanh Long Duong - One of the best experts on this subject based on the ideXlab platform.

  • A new method for non-unit protection of Power Transmission lines based on fault resistance and fault angle reduction
    International Journal of Electrical Power & Energy Systems, 2014
    Co-Authors: Zhenwei Guo, Jiangang Yao, Shengjie Yang, Hong Zhang, Tian Mao, Thanh Long Duong
    Abstract:

    Abstract In the paper, a new non-unit transient protection method suitable for single-phase faults of EHV Power Transmission lines was proposed based on the analysis of the propagation characteristics induced by fault transient current, the transition resistance and the fault angle on corresponding energy values of high-frequency transient current in extra high voltage (EHV) network. In the procedure, the transient current energy values from both sides of the bus were primarily normalized on the basis of transition resistance and fault angle, and then the characteristic value with functions of direction judge and value comparison was obtained by calculating their difference. By utilizing the characteristic value, the methodology came into being, by which the impacts of both transition resistance and fault angle were eliminated. The overall design has a high reliability level and owns twice the scope of the conventional protection. Simulations were performed and analyzed upon a three-phase 500 kV Power system by utilizing ATP/EMTP, with various kinds of typical faults being taken into account. Plenty of results verify the feasibility of the algorithm for ultra-high speed protection of EHV Power Transmission lines.