Network protector relay and method of controlling a circuit breaker employing two trip characteristics

    公开(公告)号:US06671151B2

    公开(公告)日:2003-12-30

    申请号:US09971317

    申请日:2001-10-03

    IPC分类号: H02H308

    CPC分类号: H02H3/385

    摘要: A network protector relay controls a circuit breaker connected between polyphase feeder and network busses. A circuit samples polyphase circuit breaker current and network voltage to generate digital polyphase current and voltage samples. A microcontroller generates positive sequence current and voltage vectors from the current and voltage samples. A first trip algorithm trips the breaker in response to the positive sequence current vector being in a first trip region of a first trip characteristic with respect to the positive sequence voltage vector. The first trip characteristic is defined by a reverse trip setpoint and a first positive angle. A second trip algorithm trips the breaker in response to the positive sequence current vector being in a second trip region of a second trip characteristic with respect to the positive sequence voltage vector. The second trip characteristic is defined by the reverse trip setpoint and a second negative angle.

    SYSTEM FOR FACILITATING THE COLLABORATIVE CREATION OF MUSIC
    3.
    发明申请
    SYSTEM FOR FACILITATING THE COLLABORATIVE CREATION OF MUSIC 审中-公开
    促进音乐创作的系统

    公开(公告)号:US20160085846A1

    公开(公告)日:2016-03-24

    申请号:US14889024

    申请日:2014-05-13

    IPC分类号: G06F17/30 G07C13/00 G10H1/00

    摘要: The system comprises a taxonomy for classifying a music recording and can further comprise a computing functionality. The functionality can: provide for the dissemination of identities of recordings that have been classified in accordance with the taxonomy and the classifications thereof; allow users to identify recordings that have been classified in accordance with the taxonomy; allow user to classify recordings in accordance with the taxonomy; permit users to identify music projects and to associate music recordings to projects; in respect of projects to which recordings have been associated having differing proprietors, provide a mechanism by which those proprietors can submit votes on a division of rights in a Master defined by those recordings; provide for dissemination of the recordings and the classifications by a scatterplot graph wherein each point represents a music recording, each of the dimensions of the plot being associated with a relatively highly-variable characteristic of the recording.

    摘要翻译: 该系统包括用于分类音乐记录的分类法,并且还可以包括计算功能。 功能可以:规定传播根据分类和分类进行分类的记录的身份; 允许用户识别根据分类法分类的录音; 允许用户根据分类法对录音进行分类; 允许用户识别音乐项目并将音乐录音与项目相关联; 关于与不同所有者有关的录像的项目,提供一种机制,通过这种机制,所有者可以通过记录中定义的主人分享权利来提交投票; 通过散点图提供记录和分类的传播,其中每个点表示音乐记录,该图的每个维度与记录的相对高度可变的特征相关联。

    System and method for locating faults in electric power cables
    4.
    发明授权
    System and method for locating faults in electric power cables 失效
    电力电缆故障定位系统及方法

    公开(公告)号:US5682100A

    公开(公告)日:1997-10-28

    申请号:US524033

    申请日:1995-09-06

    IPC分类号: G01R31/08

    CPC分类号: G01R31/083

    摘要: There is provided a system and method for locating faults in power distribution systems with complex topology, such as multi-phase urban networks (6), utilizing reliable time-delay techniques as well as a transponder (22) at a monitoring point to sense the arrival of the transient fault pulse and for transmitting a timing pulse a known time delay after sensing the arrival of the transient fault pulse and a calibration pulse a known time delay after transmitting the timing pulse. Installed along the power distribution system at key locations are receiver stations (4, 4a, 4b) capable of sensing the arrival of the transient fault pulse, timing pulse and calibration pulse and measuring the time intervals occurring between each. The location of the fault is then determined based on these timing intervals, known time delays and the known propagation velocity of the electric power cables in the power distribution system. Fault location accuracy is further enhanced by factoring rise-time effects of the sensed pulses into the time interval measurements.

    摘要翻译: 提供了一种用于定位具有复杂拓扑的配电系统中的故障的系统和方法,例如多阶段城市网络(6),利用可靠的时间延迟技术以及在监测点处的应答器(22)来感测 瞬时故障脉冲的到达,并且用于在传送定时脉冲之后感测到瞬态故障脉冲的到达和校准脉冲已知的时间延迟之后发送已知的时间延迟。 沿着配电系统在关键位置安装的是能够感测瞬态故障脉冲到达的定时脉冲和定时脉冲和校准脉冲的接收站(4,4a,4b),并测量每个发生的时间间隔。 然后基于这些定时间隔,已知的时间延迟和配电系统中电力电缆的已知传播速度来确定故障的位置。 通过将感测到的脉冲的上升时间效应分解为时间间隔测量值来进一步提高故障定位精度。