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61 条记录 (耗时 0.016 秒)

    Method of detecting symmetrical components of supply-line three-phase voltage and device for carrying out same
    31.
    发明授权
    Method of detecting symmetrical components of supply-line three-phase voltage and device for carrying out same 失效
    检测供电线三相电压的对称分量的方法及其执行装置

    公开(公告)号：US4451783A

    公开(公告)日：1984-05-29

    申请号：US299088

    申请日：1981-09-03

    申请人： Anatoly K. Shidlovsky ,  Sergei G. Taranov ,  Voldmir V. Braiko ,  Isaak P. Grinberg ,  Jury F. Tesik ,  Oleg L. Karasinsky

    发明人： Anatoly K. Shidlovsky ,  Sergei G. Taranov ,  Voldmir V. Braiko ,  Isaak P. Grinberg ,  Jury F. Tesik ,  Oleg L. Karasinsky

    IPC分类号： G01R29/16 ,  G01R29/18 ,  H02H3/34 ,  H02H3/353 ,  G01R25/00

    CPC分类号： G01R29/18

    摘要： A method of detecting symmetrical components of a three-phase supply-line voltage comprises the steps of converting three-phase voltage to alternating single-phase voltage with the aid of at least two function generators (2), (3), with at least one of said function generators being an active-reactive circuit, which conversion of a three-phase voltage is effected by altering said supply-line voltage in amplitude and phase in said active-reactive circuits, and subsequently summing up output voltages of the function generators (2), (3), to produce symmetrical components of said three-phase voltage, forming a control signal proportional to a disturbance influencing the output voltages of the active-reactive circuits (4) and compensating said disturbance influence by control action, wherein according to the invention said control signal is formed from the difference in voltage drop between elements (5), (6) in each active-reactive circuit, and compensating said disturbance influence is done by summing up said control signal and said voltage drop across one of said elements (5), (6) in each active-reactive circuit (4).

    摘要翻译： 检测三相电源线电压的对称分量的方法包括以下步骤：借助于至少两个功能发生器（2），（3）将三相电压转换为交流单相电压，至少具有 所述功能发生器中的一个是有源电抗电路，三相电压的转换通过改变所述有功无功电路中的幅度和相位上的所述电源线电压来实现，并且随后将功能发生器的输出电压相加 （2），（3），以产生所述三相电压的对称分量，形成与影响有源电抗电路（4）的输出电压的扰动成比例的控制信号，并通过控制动作补偿所述扰动影响，其中 根据本发明，所述控制信号由每个有功反馈电路中的元件（5），（6）之间的电压差的差异形成，并且补偿所述干扰影响 通过将每个有源电抗电路（4）中的所述控制信号和所述元件（5），（6）之一上的所述电压降相加。

    Fault identification in electric power transmission systems
    32.
    发明授权
    Fault identification in electric power transmission systems 失效
    电力传输系统故障识别

    公开(公告)号：US4390835A

    公开(公告)日：1983-06-28

    申请号：US190268

    申请日：1980-09-24

    申请人： Makeen M. Elkateb ,  William J. Cheetham

    发明人： Makeen M. Elkateb ,  William J. Cheetham

    IPC分类号： H02H3/34 ,  H02H3/353 ,  G01R31/02

    CPC分类号： H02H3/353 ,  H02H3/34

    摘要： A method of identifying faults in a polyphase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring, using analogue techniques, the instantaneous values of quantities derived from superimposed currents and/or voltages arising in the system on occurrence of a fault. Apparatus for carrying out the method is also disclosed.

    摘要翻译： 一种识别多相交流电力传输系统中的故障的方法，其中通过使用模拟技术监视从发生在系统中的叠加电流和/或电压产生的量的瞬时值来确定发生的故障类型 的错误 还公开了用于执行该方法的装置。

    Automatic transfer control device and voltage sensor
    33.
    发明授权
    Automatic transfer control device and voltage sensor 失效
    自动传输控制装置和电压传感器

    公开(公告)号：US4096395A

    公开(公告)日：1978-06-20

    申请号：US706422

    申请日：1976-07-19

    申请人： George F. Bogel ,  Robert M. Oates

    发明人： George F. Bogel ,  Robert M. Oates

    IPC分类号： H02J3/04 ,  G01R19/165 ,  G01R29/16 ,  H02H3/00 ,  H02H3/24 ,  H02H3/353 ,  H02J9/06 ,  H02J9/00

    CPC分类号： G01R29/16 ,  G01R19/16547 ,  H02J9/061 ,  Y10T307/62 ,  Y10T307/625 ,  Y10T307/647 ,  Y10T307/696 ,  Y10T307/702 ,  Y10T307/735

    摘要： An automatic transfer control device for selectively energizing an electrical distribution system from a pair of electrical power sources. The device includes voltage sensors for sensing electrical conditions on each of the sources. The device may be used on either three-wire or four-wire systems. The voltage sensors comprise an operational amplifier for artificially generating a phase-to-phase voltage from two phase-to-ground voltages. The artificially generated voltage is used to detect sequence reversal on the sources being monitored. Separate means are provided to select a source from which to draw control power for the device, the control power criterion being different from the transfer criterion.

    摘要翻译： 一种用于从一对电源选择性地给配电系统供电的自动转移控制装置。 该装置包括用于感测每个源上的电气条件的电压传感器。 该设备可用于三线制或四线制系统。 电压传感器包括用于人工地从两个相对地电压产生相间电压的运算放大器。 人为产生的电压用于检测正在监测的源的顺序反转。 提供分离的装置来选择用于为设备绘制控制功率的源，控制功率标准不同于传输标准。

    Chiller controls
    34.
    发明授权
    Chiller controls 失效
    冷水机控制

    公开(公告)号：US4084406A

    公开(公告)日：1978-04-18

    申请号：US651386

    申请日：1976-01-22

    申请人： Daniel A. Brenneman

    发明人： Daniel A. Brenneman

    IPC分类号： F04D27/02 ,  F25B1/053 ,  F25B31/00 ,  F25B49/02 ,  H02H3/353 ,  H02H7/08 ,  H02H7/09 ,  H02H11/00 ,  H02K17/30 ,  H02P1/28 ,  H02P1/26 ,  F25B49/00

    CPC分类号： H02H7/0833 ,  F04D27/0284 ,  F25B31/006 ,  F25B49/025 ,  H02H11/004 ,  H02H3/353 ,  H02H7/09 ,  H02K17/30 ,  H02P1/28 ,  F25B1/053 ,  F25B2600/021 ,  Y02B30/741

    摘要： A solid state starter for a chiller compressor motor mounts directly on the compressor motor and comprises a bank of SCR's which are controllably switched to conduct current to the motor for starting and running. Electronic control modules are provided including a trigger module for triggering the SCR's, a current module (including current overload protection) for controlling the trigger module so that motor current is controllably delivered to the motor, and a voltage safety module for protecting against electrical faults. The SCR's are cooled by liquid refrigerant.

    摘要翻译： 用于冷却器压缩机电动机的固态起动器直接安装在压缩机电动机上，并且包括可控地切换以将电流传导到电动机以启动和运行的SCR组。 提供电子控制模块，包括用于触发SCR的触发模块，用于控制触发模块的电流模块（包括电流过载保护），使得电动机电流可控地传递到电动机;以及电压安全模块，用于防止电气故障。 SCR由液体制冷剂冷却。

    Ground connection monitoring apparatus for mobile machines
    35.
    发明授权
    Ground connection monitoring apparatus for mobile machines 失效
    移动机接地连接监控装置

    公开(公告)号：US3895264A

    公开(公告)日：1975-07-15

    申请号：US43177474

    申请日：1974-01-08

    申请人： MOSEBACH MFG CO

    发明人： KIRILLOFF VICTOR V

    IPC分类号： H02H3/353 ,  H02H11/00 ,  H02H3/08 ,  H02H3/24 ,  H02H3/28

    CPC分类号： H02H11/001 ,  H02H3/353

    摘要： Apparatus protected against ground faults for monitoring the ground connection between a grounded power source and a mobile machine provided with multi-phase power through a multi-conductor trailing cable has a star arrangement of impedances connected to the phase conductors at the power source and a like arrangement connected at the machine, the junctions of which are connected to the ground conductor at each end, through a silicon-controlled rectifier device which is paralleled by a monitoring impedance. At least one impedance of one of the star arrangement of impedances is adjusted to provide a low monitoring voltage which circulates a current through the ground conductor and monitoring impedance. The voltage across the latter actuates monitoring means. The silicon-controlled rectifier is adjusted to conduct when the voltage across it rises above the monitoring level. The monitoring current may be alternating current, or direct current obtained from a rectifier in circuit with the ground conductor.

    摘要翻译： 防止接地故障的设备用于监测接地电源和通过多导体拖缆电缆提供多相电力的移动机器之间的接地连接，具有连接到电源处的相位导体等的星形结构 通过与监控阻抗并联的硅控整流装置，在机器处连接的布置，其结点在每端连接到接地导体。 调整星形布置阻抗中的一个阻抗的至少一个阻抗以提供低电流，使电流循环通过接地导体并监测阻抗。 后者的电压驱动监控装置。 当其上的电压上升到监控电平以上时，可调节硅控整流器进行导通。 监控电流可以是交流电流，也可以是从与接地导体电路的整流器获得的直流电流。