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    Fault identification techniques for high resistance grounded systems
    5.
    发明授权
    Fault identification techniques for high resistance grounded systems 有权
    高电阻接地系统的故障识别技术

    公开(公告)号：US09091742B2

    公开(公告)日：2015-07-28

    申请号：US13400537

    申请日：2012-02-20

    申请人： Lixiang Wei ,  Zhijun Liu

    发明人： Lixiang Wei ,  Zhijun Liu

    IPC分类号： G01R31/00 ,  G01R31/42 ,  G01R31/02

    CPC分类号： G01R31/42 ,  G01R31/025

    摘要： The present techniques include methods and systems for detecting a high resistive ground fault condition in an HRG system. Embodiments include systems and methods of measuring drive voltages and detecting voltage changes in the drive once the drive is in operation, particularly for drives operating at relatively low voltages and frequencies. In some embodiments, an integrator is utilized to detect peaks in the measured voltage changes. Relatively small ground currents are also measured to determine HRG faults. Moreover, in some embodiments, the detection of an HRG fault for one of several motor drives provide indication for the particular motor drive in fault.

    摘要翻译： 本技术包括用于检测HRG系统中的高电阻接地故障状况的方法和系统。 实施例包括测量驱动电压并检测驱动器运行中的电压变化的系统和方法，特别是对于在较低电压和频率下工作的驱动器。 在一些实施例中，使用积分器来检测所测量的电压变化中的峰值。 还测量相对较小的接地电流以确定HRG故障。 此外，在一些实施例中，几个电动机驱动器之一的HRG故障的检测为故障中的特定电机驱动器提供指示。

    FAULT IDENTIFICATION TECHNIQUES FOR HIGH RESISTANCE GROUNDED SYSTEMS
    6.
    发明申请
    FAULT IDENTIFICATION TECHNIQUES FOR HIGH RESISTANCE GROUNDED SYSTEMS 有权
    高电压接地系统的故障识别技术

    公开(公告)号：US20130218491A1

    公开(公告)日：2013-08-22

    申请号：US13400537

    申请日：2012-02-20

    申请人： Lixiang Wei ,  Zhijun Liu

    发明人： Lixiang Wei ,  Zhijun Liu

    IPC分类号： G01R31/12 ,  G01R31/14

    CPC分类号： G01R31/42 ,  G01R31/025

    摘要： The present techniques include methods and systems for detecting a high resistive ground fault condition in an HRG system. Embodiments include systems and methods of measuring drive voltages and detecting voltage changes in the drive once the drive is in operation, particularly for drives operating at relatively low voltages and frequencies. In some embodiments, an integrator is utilized to detect peaks in the measured voltage changes. Relatively small ground currents are also measured to determine HRG faults. Moreover, in some embodiments, the detection of an HRG fault for one of several motor drives provide indication for the particular motor drive in fault.

    摘要翻译： 本技术包括用于检测HRG系统中的高电阻接地故障状况的方法和系统。 实施例包括测量驱动电压并检测驱动器运行中的电压变化的系统和方法，特别是对于在较低电压和频率下工作的驱动器。 在一些实施例中，使用积分器来检测所测量的电压变化中的峰值。 还测量相对较小的接地电流以确定HRG故障。 此外，在一些实施例中，几个电动机驱动器之一的HRG故障的检测为故障中的特定电机驱动器提供指示。

    DC bus clamp circuit to prevent over voltage failure of adjustable speed drives
    7.
    发明授权
    DC bus clamp circuit to prevent over voltage failure of adjustable speed drives 有权
    直流母线钳位电路可防止变频器过电压故障

    公开(公告)号：US08233258B2

    公开(公告)日：2012-07-31

    申请号：US12354109

    申请日：2009-01-15

    申请人： Lixiang Wei ,  Zhijun Liu ,  Gary L. Skibinski

    发明人： Lixiang Wei ,  Zhijun Liu ,  Gary L. Skibinski

    IPC分类号： H02H3/22

    CPC分类号： H02P29/02 ,  H02M1/32 ,  H02P27/06

    摘要： The present invention relates to a protective circuit to provide over voltage protection for an ASD. The protective circuit provides the benefits of fewer components with lower power ratings than existing protective circuits. The protective circuit may be incorporated directly in the ASD for continuous protection or mounted externally and connected to the ASD under operating conditions that require the circuit. This flexibility for mounting the protective circuit allows the capacitor of the protective circuit to be sized either in relation to capacitive elements on the DC bus within the ASD or according to external capacitance observed at the output of the ASD. In addition, the circuit is only operative during an overvoltage condition allowing for power ratings lower than would be required for continuous operation.

    摘要翻译： 本发明涉及一种为ASD提供过电压保护的保护电路。 保护电路具有较少的额定功率比现有保护电路更少的元件的优点。 保护电路可以直接并入ASD，用于连续保护或外部安装，并在需要电路的工作条件下连接到ASD。 安装保护电路的这种灵活性允许保护电路的电容器的尺寸与ASD内的DC总线上的电容元件或ASD的输出端所观察到的外部电容相匹配。 此外，该电路仅在过压状态下工作，允许额定电压低于连续工作所需的额定功率。

    DC BUS CLAMP CIRCUIT TO PREVENT OVER VOLTAGE FAILURE OF ADJUSTABLE SPEED DRIVES
    8.
    发明申请
    DC BUS CLAMP CIRCUIT TO PREVENT OVER VOLTAGE FAILURE OF ADJUSTABLE SPEED DRIVES 有权
    DC BUS钳位电路，以防止可调节速度驱动器的电压故障

    公开(公告)号：US20100177452A1

    公开(公告)日：2010-07-15

    申请号：US12354109

    申请日：2009-01-15

    申请人： Lixiang Wei ,  Zhijun Liu ,  Gary L. Skibinski

    发明人： Lixiang Wei ,  Zhijun Liu ,  Gary L. Skibinski

    IPC分类号： H02H9/04

    CPC分类号： H02P29/02 ,  H02M1/32 ,  H02P27/06

    摘要： The present invention relates to a protective circuit to provide over voltage protection for an ASD. The protective circuit provides the benefits of fewer components with lower power ratings than existing protective circuits. The protective circuit may be incorporated directly in the ASD for continuous protection or mounted externally and connected to the ASD under operating conditions that require the circuit. This flexibility for mounting the protective circuit allows the capacitor of the protective circuit to be sized either in relation to capacitive elements on the DC bus within the ASD or according to external capacitance observed at the output of the ASD. In addition, the circuit is only operative during an overvoltage condition allowing for power ratings lower than would be required for continuous operation.

    摘要翻译： 本发明涉及一种为ASD提供过电压保护的保护电路。 保护电路具有较少的额定功率比现有保护电路更少的元件的优点。 保护电路可以直接并入ASD，用于连续保护或外部安装，并在需要电路的工作条件下连接到ASD。 安装保护电路的这种灵活性允许保护电路的电容器的尺寸与ASD内的DC总线上的电容元件或ASD的输出端所观察到的外部电容相匹配。 此外，该电路仅在过压状态下工作，允许额定电压低于连续工作所需的额定功率。