The Experts below are selected from a list of 3435 Experts worldwide ranked by ideXlab platform

Weidong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Study on Influence of Electromagnetic Disturbance on Wireless Sensor Unit in Substation
    2018 IEEE Symposium on Electromagnetic Compatibility Signal Integrity and Power Integrity (EMC SI & PI), 2018
    Co-Authors: Weidong Zhang
    Abstract:

    This paper mainly focuses on feature of the Electromagnetic Disturbance generated by power system and influence on wireless sensor unit. Wireless sensor unit works in substation for signal acquisition and transmission. Influence of Electromagnetic Disturbance, which is generated in substations of different voltage levels and of different insulation types, on wireless sensors is studied in order to ensure reliability and security. After field measurement and analysis, simulation and immunity test are performed based on extensive field measurement data. Statistical characteristics of Electromagnetic Disturbance are obtained. Immunity of wireless sensor unit in substation is studied.

  • Analysis of MMC-HVDC System Structures Influence on Radiated Electromagnetic Disturbance
    2018 IEEE Symposium on Electromagnetic Compatibility Signal Integrity and Power Integrity (EMC SI & PI), 2018
    Co-Authors: Jian Zhang, Weidong Zhang, Xiuwu Zhang
    Abstract:

    The radiated Electromagnetic Disturbance models of HVDC modular multilevel converter (MMC-HVDC) system in different structures were established under the condition of determined capacity of the system. The electric field distribution at 5 meters from the valve towers in the valve hall and the electric field at 200 meters from the valve hall were calculated in the frequency domain. The radiated Electromagnetic characteristics of converter system in different structures were obtained, which provides a reference for the design of MMC-HVDC converter system Electromagnetic compatibility.

  • measurement system and measurement method for Disturbance voltage and Disturbance current of gis gas insulated switchgear secondary system
    2012
    Co-Authors: Xiang Cui, Weidong Zhang, Rong Hu, Weijiang Chen, Lei Qi, Peilong Chen, Min Dai, Weidong Shi
    Abstract:

    The invention discloses a measurement system and a measurement method for Disturbance voltage and Disturbance current of a GIS (gas insulated switchgear) secondary system, which belong to the field of measurement of Disturbance voltage and Disturbance current. The measurement system for Disturbance voltage and Disturbance current is all shielded so as to reduce measurement errors caused by external Electromagnetic interference. The invention has the advantages that a shielding method and a shielding device for measuring Disturbance voltage and Disturbance current of a substation secondary system are provided, influence of field Electromagnetic Disturbance of substation GIS equipment on measurement of the Disturbance voltage and Disturbance current of the secondary system can be greatly reduced, measurement accuracy is improved, and the field measurement method and the field measurement system for Disturbance voltage and Disturbance current of the substation GIS equipment secondary system are provided.

Cui Xiang - One of the best experts on this subject based on the ideXlab platform.

  • A study on Electromagnetic Disturbance and immunity of wireless sensor unit in substation
    2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
    Co-Authors: Zhang Weidong, Cui Xiang, Ma Haijie, Jin Yang, Meng Fanbo
    Abstract:

    Wireless sensor unit is important part of the Internet of Things, which is responsible for signal acquisition and transmission. In order to ensure reliability and security of the Internet of Things, Electromagnetic Disturbance issue in substation where wireless sensors are usually located is studied. This paper focuses on the Electromagnetic Disturbance to wireless sensor unit generated by power system and immunity of wireless sensor unit. Research on characteristics of steady-state Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is performed, through field measurements. Statistical characteristics of Electromagnetic Disturbance in frequency domain are obtained, based on extensive field measurement data. Simulation is applied to reveal influence of Electromagnetic Disturbance to wireless sensor unit. Immunity of wireless sensor unit in the Internet of Things in substation is studied. Experiment indicates that wireless sensor unit is influenced by Electromagnetic Disturbance and immunity test of wireless sensor unit are performed.

  • A study on immunity of wireless sensor unit in substation
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: An Bo, Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    This paper studies on immunity of wireless sensor unit in the Internet of Things in substation, which is responsible for signal acquisition and transmission. Field measurement and experiment indicate that the wireless sensor unit is influenced by Electromagnetic Disturbance in substation. Analysis of the measurement data shows that frequency range of Electromagnetic Disturbance includes the communication frequency of the wireless sensor unit. In order to reveal the distribution of induced voltage under Electromagnetic Disturbance in the wireless sensor unit and ensure reliability and security of the Internet of Things in substation, simulation and immunity test of the wireless sensor unit are performed.

  • A study on Electromagnetic Disturbance in substation to wireless sensor unit
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    Wireless sensor unit is a vital part of the Internet of Things, which is responsible for signal acquisition and transmission. Electromagnetic Disturbance issue in substation where wireless sensors are usually located be studied to ensure reliability and security of the Internet of Things. This paper focuses on the Electromagnetic Disturbance to the wireless sensor unit generated by operation of power system. Through field measurements, research on characteristics of steady-state and transient Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is carried out. Moreover, experiments of partial discharge and flashover in a high-voltage experimental hall are performed and transient Electromagnetic Disturbance characteristics are gained. Through statistical analysis based on extensive field measurement data, statistical characteristics of Electromagnetic Disturbance in time domain and frequency domain are, therefore, obtained. Simulation is applied to reveal influence of Electromagnetic Disturbance to the wireless sensor unit.

  • Small Sample Statistics for Transient Electromagnetic Disturbance Characteristics of HVDC Converter Stations
    Power system technology, 2012
    Co-Authors: Cui Xiang
    Abstract:

    In view of limited operation times of circuit breakers in HVDC converter station,there was limited data of transient Electromagnetic Disturbance measured in the converter station and for such an occasion traditional statistics for large samples was no longer applicable,so it was necessary to adopt small sample statistics for the analysis.Firstly,two kinds of recently widely applied small sample statistical methods were presented;then through case study the superiority of the two methods in processing small sample problems was summarized;finally,according to measured data of transient Electromagnetic Disturbances in relay protection chamber of a certain converter station the statistical results of characteristic values of transient Electromagnetic Disturbances were attained by random weighting method.Analyzing characteristics of transient Electromagnetic Disturbances was favorable for the assessment on total level of Electromagnetic Disturbances within converter station as well as for proposing or perfecting the transient noise immunity standard for secondary equipments.

Xiang Cui - One of the best experts on this subject based on the ideXlab platform.

  • Electromagnetic Disturbance Characteristics and Influence Factors of PETT Oscillation in High-Voltage IGBT Devices
    IEEE Transactions on Power Electronics, 2021
    Co-Authors: Jiayu Fan, Zhibin Zhao, Jinqiang Zhang, Cheng Peng, Xinling Tang, Xiang Cui
    Abstract:

    Plasma extraction transit time (PETT) oscillation occurs when insulated gate bipolar transistor (IGBT) devices turn off, whose frequency can reach hundreds of MHz. This high-frequency oscillation can induce Electromagnetic interference problems and may exceed relevant IEC limits for Electromagnetic emission. As one of the Electromagnetic Disturbance sources from internal IGBT, the PETT oscillation has not attracted much attention in the Electromagnetic compatibility (EMC) problems of application and development of high-voltage IGBT devices yet. In this article, the detailed characteristics of PETT oscillation, i.e., oscillation frequency, duration time, and oscillation peak, in high-voltage IGBT devices are systematically investigated by experiments. From the results, oscillation frequency increases with the increase of reverse voltage, whereas decreases with the increase of the temperature. Then, more complex dependencies of the PETT oscillation characteristics on IGBT's commutation conditions are presented. It is shown that its characteristics vary greatly under different reverse voltage, forward current, and temperature. The hazard of PETT oscillation to electronic components is discussed as well. PETT oscillation occurs during the turn-on process, which is first reported. Based on the experiment results, the EMC test related to PETT oscillation is suggested to be performed under different commutation conditions.

  • characteristics of Electromagnetic Disturbance for intelligent component due to switching operations via a 1100 kv ac gis test circuit
    IEEE Transactions on Power Delivery, 2017
    Co-Authors: Xiang Cui, Xiao Fan Liu, Chong Qing Jiao, Weijiang Chen, Lei Wang
    Abstract:

    Switching operation of the disconnector in gas-insulated switchgear (GIS) results in very fast transient overvoltage in GIS pipes. In a smart substation, this process induces Disturbance voltage on the port of the intelligent component fixed on GIS pipes or placed in the local cabinet nearby, which then may lead to the failure of the equipment. The experimental results of the port Disturbance voltage during the switching operation via a 1100 kV test circuit are first reported in this paper. The test arrangement, including both 70 opening operations and 70 closing operations, had been performed. The influences of different grounding schemes of cable shield on port Disturbance had been investigated. Three different cases of the terminal load had also been considered: open circuit, short circuit, and 50 Ω. Over 100 000 micro-pulses had been extracted from the Disturbance voltage waveforms. The waveform characteristics including peak voltage, rise-time, oscillation frequency, and decaying had been obtained by statistical analysis of these micro-pulses. Furthermore, the differences between measured waveforms and the IEC 61000-4-18 immunity test standard waveform had been discussed.

  • measurement system and measurement method for Disturbance voltage and Disturbance current of gis gas insulated switchgear secondary system
    2012
    Co-Authors: Xiang Cui, Weidong Zhang, Rong Hu, Weijiang Chen, Lei Qi, Peilong Chen, Min Dai, Weidong Shi
    Abstract:

    The invention discloses a measurement system and a measurement method for Disturbance voltage and Disturbance current of a GIS (gas insulated switchgear) secondary system, which belong to the field of measurement of Disturbance voltage and Disturbance current. The measurement system for Disturbance voltage and Disturbance current is all shielded so as to reduce measurement errors caused by external Electromagnetic interference. The invention has the advantages that a shielding method and a shielding device for measuring Disturbance voltage and Disturbance current of a substation secondary system are provided, influence of field Electromagnetic Disturbance of substation GIS equipment on measurement of the Disturbance voltage and Disturbance current of the secondary system can be greatly reduced, measurement accuracy is improved, and the field measurement method and the field measurement system for Disturbance voltage and Disturbance current of the substation GIS equipment secondary system are provided.

  • Measurement and calculation of the transient Electromagnetic Disturbances of secondary system in HVDC converter station
    2008
    Co-Authors: Lei Liu, Qi Wang, Xiang Cui, Haifeng Sun
    Abstract:

    Many new technologies especially micro electronic components have been widely used in the secondary system of the HVDC converter stations. When switch operated there would be kinds of actuating of relay in secondary system. The action of relay tip will generated Electromagnetic Disturbance (EMD) which will transmit to the protect devices along the secondary cables. The results of an experimental study on the EMD of secondary system in HVDC converter station are presented in this paper. The model of secondary cable and calculation of EMD are also presented. Based on the experimental and calculation results, the characteristics of EMI in secondary system are analyzed. The results of this paper has certain reference value for the device of the anti EMD of the secondary system.

Zhang Weidong - One of the best experts on this subject based on the ideXlab platform.

  • Study on influence of Electromagnetic Disturbance on wireless sensor unit in substation
    2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2015
    Co-Authors: Zhang Weidong, Z. Wang
    Abstract:

    Wireless sensor unit is vital part of the Internet of Things, which is applied for signal acquisition and transmission. Electromagnetic Disturbance issue in substation where wireless sensor unit is located is studied, in order to ensure reliability and security of the Internet of Things. Through field measurements, research on characteristics of steady-state Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is performed. Simulation of Electromagnetic Disturbance and location of electrical equipment is applied to reveal influence on communication quality of wireless sensor unit.

  • A study on Electromagnetic Disturbance and immunity of wireless sensor unit in substation
    2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
    Co-Authors: Zhang Weidong, Cui Xiang, Ma Haijie, Jin Yang, Meng Fanbo
    Abstract:

    Wireless sensor unit is important part of the Internet of Things, which is responsible for signal acquisition and transmission. In order to ensure reliability and security of the Internet of Things, Electromagnetic Disturbance issue in substation where wireless sensors are usually located is studied. This paper focuses on the Electromagnetic Disturbance to wireless sensor unit generated by power system and immunity of wireless sensor unit. Research on characteristics of steady-state Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is performed, through field measurements. Statistical characteristics of Electromagnetic Disturbance in frequency domain are obtained, based on extensive field measurement data. Simulation is applied to reveal influence of Electromagnetic Disturbance to wireless sensor unit. Immunity of wireless sensor unit in the Internet of Things in substation is studied. Experiment indicates that wireless sensor unit is influenced by Electromagnetic Disturbance and immunity test of wireless sensor unit are performed.

  • A study on immunity of wireless sensor unit in substation
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: An Bo, Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    This paper studies on immunity of wireless sensor unit in the Internet of Things in substation, which is responsible for signal acquisition and transmission. Field measurement and experiment indicate that the wireless sensor unit is influenced by Electromagnetic Disturbance in substation. Analysis of the measurement data shows that frequency range of Electromagnetic Disturbance includes the communication frequency of the wireless sensor unit. In order to reveal the distribution of induced voltage under Electromagnetic Disturbance in the wireless sensor unit and ensure reliability and security of the Internet of Things in substation, simulation and immunity test of the wireless sensor unit are performed.

  • A study on Electromagnetic Disturbance in substation to wireless sensor unit
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    Wireless sensor unit is a vital part of the Internet of Things, which is responsible for signal acquisition and transmission. Electromagnetic Disturbance issue in substation where wireless sensors are usually located be studied to ensure reliability and security of the Internet of Things. This paper focuses on the Electromagnetic Disturbance to the wireless sensor unit generated by operation of power system. Through field measurements, research on characteristics of steady-state and transient Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is carried out. Moreover, experiments of partial discharge and flashover in a high-voltage experimental hall are performed and transient Electromagnetic Disturbance characteristics are gained. Through statistical analysis based on extensive field measurement data, statistical characteristics of Electromagnetic Disturbance in time domain and frequency domain are, therefore, obtained. Simulation is applied to reveal influence of Electromagnetic Disturbance to the wireless sensor unit.

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

  • A study on immunity of wireless sensor unit in substation
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: An Bo, Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    This paper studies on immunity of wireless sensor unit in the Internet of Things in substation, which is responsible for signal acquisition and transmission. Field measurement and experiment indicate that the wireless sensor unit is influenced by Electromagnetic Disturbance in substation. Analysis of the measurement data shows that frequency range of Electromagnetic Disturbance includes the communication frequency of the wireless sensor unit. In order to reveal the distribution of induced voltage under Electromagnetic Disturbance in the wireless sensor unit and ensure reliability and security of the Internet of Things in substation, simulation and immunity test of the wireless sensor unit are performed.

  • A study on Electromagnetic Disturbance in substation to wireless sensor unit
    International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
    Co-Authors: Zhang Weidong, Cui Xiang, Li Jikun, Shi Yingbin, Liu Shaoyu
    Abstract:

    Wireless sensor unit is a vital part of the Internet of Things, which is responsible for signal acquisition and transmission. Electromagnetic Disturbance issue in substation where wireless sensors are usually located be studied to ensure reliability and security of the Internet of Things. This paper focuses on the Electromagnetic Disturbance to the wireless sensor unit generated by operation of power system. Through field measurements, research on characteristics of steady-state and transient Electromagnetic Disturbance in substations of different voltage levels and of different insulation types is carried out. Moreover, experiments of partial discharge and flashover in a high-voltage experimental hall are performed and transient Electromagnetic Disturbance characteristics are gained. Through statistical analysis based on extensive field measurement data, statistical characteristics of Electromagnetic Disturbance in time domain and frequency domain are, therefore, obtained. Simulation is applied to reveal influence of Electromagnetic Disturbance to the wireless sensor unit.