公开(公告)号：US4489358A

公开(公告)日：1984-12-18

申请号：US423330

申请日：1982-09-24

申请人： William R. Davis ,  David G. Hart

发明人： William R. Davis ,  David G. Hart

IPC分类号： G11B33/02 ,  G11B33/12 ,  G11B33/14 ,  H05K7/16 ,  H05K7/18 ,  H05K7/20 ,  H02B1/02

CPC分类号： G11B33/02 ,  G11B33/12 ,  G11B33/1406 ,  H05K7/16 ,  H05K7/18 ,  H05K7/20009

摘要： To mimimize the weight of a magnetic tape recorder chassis and cabinet assembly, a wire frame chassis (18) carrying printed circuit board guides (20) and connectors (22) is mounted to one side of a sand cast bezel (24), and polyurethane wall panels (16) are secured to the wire frame. A cabinet cover and underlying tape transport assembly are hinged to the bezel to enable pivoting away from the wire frame, exposing circuit boards for servicing. The "open air flow" characteristic of the wire frame chassis (18) helps cool critical electrical components.

摘要翻译： 为了模拟磁带录音机机架和机柜组件的重量，承载印刷电路板引导件（20）和连接器（22）的线框底架（18）安装在砂铸表圈（24）的一侧，聚氨酯 墙板（16）固定在线框上。 机柜盖和下层带运输组件铰接到挡板上以使得能够远离线框架转动，露出用于维修的电路板。 线框架底架（18）的“露天气流”特性有助于冷却关键的电气部件。

公开(公告)号：US20100278187A1

公开(公告)日：2010-11-04

申请号：US12433400

申请日：2009-04-30

申请人： David G. Hart ,  Edward J. Beroset ,  Carl J. LaPlace

发明人： David G. Hart ,  Edward J. Beroset ,  Carl J. LaPlace

IPC分类号： H04J3/16 ,  H04L12/56

CPC分类号： H04L45/00 ,  H04L67/12 ,  H04L69/18

摘要： Techniques for using an Advanced Metering Infrastructure (AMI) system for Utility Automation (UA) purposes in a utility distribution system are disclosed herein. In an AMI system, a metering node often includes a communications option board for connecting to a wide area network (WAN), which can be shared between the AMI system and a UA system. The metering node may be near other devices that can be controlled by a utility company to monitor and control components of the utility distribution system. A data packet is received in a communication device. The communication device determines whether the received data packet is formatted according to a first protocol employed by the AMI system. If so, then the data packet is forwarded to a first device in communication with the AMI system. If not, then the data packet is forwarded to a second device in communication with the UA system.

摘要翻译： 本文公开了在公用设施分配系统中使用用于实用自动化（UA）的高级计量基础设施（AMI）系统的技术。 在AMI系统中，计费节点通常包括用于连接到可以在AMI系统和UA系统之间共享的广域网（WAN）的通信选件板。 计量节点可能靠近可由公用事业公司控制以监视和控制公用设施分配系统的组件的其他设备。 在通信设备中接收数据分组。 通信设备确定接收到的数据分组是否根据AMI系统采用的第一协议进行格式化。 如果是，则将数据分组转发到与AMI系统通信的第一设备。 如果不是，则将数据分组转发到与UA系统通信的第二设备。

公开(公告)号：US06687573B2

公开(公告)日：2004-02-03

申请号：US09803839

申请日：2001-03-12

申请人： William M. Egolf ,  David G. Hart ,  Carl J. LaPlace ,  Graeme N. McClure

发明人： William M. Egolf ,  David G. Hart ,  Carl J. LaPlace ,  Graeme N. McClure

IPC分类号： H02H3093

CPC分类号： H02H3/07 ,  H02H3/006 ,  H02H3/063 ,  H02H7/30

摘要： An automatic power restoration device has a modifiable end point. The end point is indicative of the operational parameters of the automatic power restoration device. A user can modify the end point and thus the operational parameters of the automatic power restoration device. The end point can be modified according to the protection characteristics of other fault protection devices within a power system.

摘要翻译： 自动电源恢复装置具有可修改的端点。 终点表示自动电力恢复装置的运行参数。 用户可以修改终点，从而修改自动电源恢复装置的操作参数。 终点可以根据电力系统内其他故障保护装置的保护特性进行修改。

公开(公告)号：US06584417B1

公开(公告)日：2003-06-24

申请号：US09425661

申请日：1999-10-22

申请人： Yi Hu ,  Damir Novosel ,  David G. Hart

发明人： Yi Hu ,  Damir Novosel ,  David G. Hart

IPC分类号： G01R3108

CPC分类号： G01R31/085 ,  H02H3/081 ,  H02H3/405

摘要： An electrical power system includes a transmission line for transmitting electrical power, series capacitance compensation series-coupled to the transmission line adjacent one end thereof, where the series compensation includes a capacitance having a value (−j XCAP), and a protective relay at the one end of the transmission line for monitoring line voltages and line currents on the transmission line. Upon sensing a fault, an impedance Z of the line is calculated based on the monitored line voltages and line currents. The calculated impedance Z is adjusted according to the value of the capacitance of the series compensation (−j XCAP) to result in a modified impedance ZMOD, and the phasor angle Of ZMOD is examined to determine the direction of the sensed fault. The fault is in a first direction if the phasor angle is between X and X+180 degrees and is in a second direction opposite the first direction if the phasor angle is between X+180 and X+360 degrees.

摘要翻译： 电力系统包括用于发送电力的传输线，串联耦合到其一端附近的传输线的串联电容补偿，其中串联补偿包括具有值（-j XCAP）的电容，以及保护继电器 传输线的一端用于监测传输线上的线路电压和线路电流。 在检测到故障时，根据被监测的线路电压和线路电流计算线路的阻抗Z。 根据串联补偿（-j XCAP）的电容值调整计算阻抗Z，得到修正的阻抗ZMOD，并检查ZMOD的相量角以确定感测故障的方向。 如果相量角在X和X + 180度之间，并且如果相量角在X + 180和X + 360度之间，并且处于与第一方向相反的第二方向，则故障处于第一方向。

公开(公告)号：US06185482B2

公开(公告)日：2001-02-06

申请号：US09037359

申请日：1998-03-10

申请人： Michael Egolf ,  David G. Hart ,  James D. Stoupis

发明人： Michael Egolf ,  David G. Hart ,  James D. Stoupis

IPC分类号： H02J114

CPC分类号： H02H3/05 ,  H02H7/06

摘要： A method and apparatus for over current backup protection is provided. The method generates a set of root mean square (rms) values from samples that are taken from the system current. Several rms current values are averaged to generate an estimated rms over current value. The estimated over current value is compared with a predetermined threshold value. If the estimated current is above the predetermined threshold value, a fault protection mechanism, such as opening a circuit breaker, is activated. A generator protection unit having digital signal processing capabilities executes the inventive method to provide protection from over current episodes.

摘要翻译： 提供了一种用于过流备份保护的方法和装置。 该方法从从系统电流获取的样本中生成一组均方根（rms）值。 将几个均方根电流值平均以产生超过电流值的估计有效值。 将估计的过电流值与预定阈值进行比较。 如果估计电流高于预定阈值，则启动诸如断路器之类的故障保护机构。 具有数字信号处理能力的发生器保护单元执行本发明的方法以提供对过去电流的保护。

公开(公告)号：US06173216B2

公开(公告)日：2001-01-09

申请号：US09060508

申请日：1998-04-15

申请人： Khoi Vu ,  David G. Hart ,  Damir Novosel

发明人： Khoi Vu ,  David G. Hart ,  Damir Novosel

IPC分类号： H02J114

CPC分类号： H02H1/0092 ,  G01R19/2513

摘要： As a variation of the non-orthogonal filter, a phasor estimate is computed by using an N-point window. An aspect of the sub-window cosine filter is to repeat the basic cosine filter for only selected points of the window. In the end, a least-squares fit is used to obtain an estimate for the phasors components. Previous cosine techniques use a data window whose length is greater than 1 cycle while the present invention requires only 1 cycle.

摘要翻译： 作为非正交滤波器的变型，通过使用N点窗口来计算相量估计。 子窗口余弦滤波器的一个方面是仅对窗口的选定点重复基本余弦滤波器。 最后，使用最小二乘拟合来获得相量分量的估计。 以前的余弦技术使用长度大于1周期的数据窗口，而本发明仅需要1个周期。

公开(公告)号：US6154687A

公开(公告)日：2000-11-28

申请号：US60458

申请日：1998-04-15

申请人： David G. Hart ,  Damir Novosel ,  Robert A. Smith

发明人： David G. Hart ,  Damir Novosel ,  Robert A. Smith

IPC分类号： G01R19/25 ,  H02H3/38 ,  H02J1/14 ,  H02H7/00 ,  H02H9/00 ,  H02J3/02 ,  H02J17/00

CPC分类号： G01R19/2513 ,  H02H3/38

摘要： A high sample rate cosine filter eliminates DC components by summing them such that they sum to zero. A non-orthogonal cosine filter is also provided. When the cosine filter is applied for N=4 samples per cycle, the samples are separated by 90 degrees. However, at higher sampling rates, it is not necessary to wait for 90 degrees to estimate the phasor value. Non-orthogonal components are used to estimate the phasor value. The time delay associated with the cosine filter is reduced in the process.

摘要翻译： 高采样率余弦滤波器通过将它们相加来消除DC分量，使得它们总和为零。 还提供了非正交余弦滤波器。 当每个循环使用余弦滤波器N = 4个样本时，样本被分离90度。 然而，在更高的采样率下，不需要等待90度来估计相量值。 非正交分量用于估计相量值。 与余弦滤波器相关的时间延迟在该过程中减少。

公开(公告)号：US4177922A

公开(公告)日：1979-12-11

申请号：US833175

申请日：1977-09-08

申请人： David G. Hart ,  Norman B. Venaas

发明人： David G. Hart ,  Norman B. Venaas

IPC分类号： G01R11/64 ,  G06C15/42 ,  G01R11/02

CPC分类号： G01R11/64

摘要： A meter includes a single sweep hand dial for indicating maximum demand in a predetermined time period as well as a multidial decade register for recording cumulative demand. The sweep hand dial is driven by a pusher gear. A pusher arm urges the pusher gear in a first rotational direction to record maximum demand during the period. To reset the mechanism, a button is pushed manually to axially displace a reset gear into meshing engagement with a relatively high speed gear train driven by the timer motor. As the reset gear is thus moved, pins on the reset gear are displaced from stowage slots in a plate, and as the reset gear rotates, the pins ride on the plate until the reset gear completes a full cycle of operation during which time another pin on the reset gear engages a second tab on the pusher gear to reset the pusher gear in a rotational direction counter to that in which the pusher arm had rotated the pusher gear. During reset, the pusher gear drives a memory gear train provided with a unidirectional drive to transfer the maximum period demand to the cumulative demand register. When the reset gear completes its cycle, the pins are forced back into their stowage slots to disengage the reset gear from its drive. A reset spring urges one of the pins on the reset gear against an edge of its stowage slot to insure accurate zero reset of the reset gear. One tab on the pusher gear is adjustable to facilitate synchronization between the pusher arm and the reset gear.

摘要翻译： 仪表包括单个扫描手指，用于指示预定时间段内的最大需求以及用于记录累积需求的多节点十进制寄存器。 扫把手表由推动器齿轮驱动。 推动臂在第一旋转方向上推动推动器齿轮以记录该期间的最大需求。 为了复位机构，手动推动按钮以将复位齿轮轴向移位成与由定时电机驱动的较高速齿轮系啮合。 当复位齿轮因此移动时，复位齿轮上的销钉从板上的装载槽移位，并且当复位齿轮旋转时，销钉骑在板上，直到复位齿轮完成整个操作周期，在此期间，另一个引脚 在复位齿轮上接合推动器齿轮上的第二突出部，以沿与推动臂旋转推动器齿轮相反的旋转方向复位推动器齿轮。 在复位期间，推动器齿轮驱动设置有单向驱动器的存储器齿轮系，以将最大周期需求传送到累积需求寄存器。 当复位齿轮完成其循环时，销被强制回到其存放槽中，以使复位齿轮从其驱动器脱离。 复位弹簧将复位齿轮上的一个销钉推压到其存储槽的边缘，以确保复位齿轮的精确零点复位。 推动器齿轮上的一个突片是可调节的，以便于推动臂和复位齿轮之间的同步。

公开(公告)号：US08212432B2

公开(公告)日：2012-07-03

申请号：US12696971

申请日：2010-01-29

申请人： David G. Hart ,  Charles H. Jones

发明人： David G. Hart ,  Charles H. Jones

IPC分类号： H01H9/20 ,  H01H67/00 ,  H01H63/36

CPC分类号： G01R22/061 ,  G01D4/02 ,  Y02B90/246 ,  Y04S20/42

摘要： Safety in an electricity metering environment is improved by providing an additional level of safety interlocking to disconnect switches and other control relays in electricity meters.

摘要翻译： 通过提供额外的安全联锁水平来改善电力计量环境中的安全性，以断开电表中的开关和其他控制继电器。

公开(公告)号：US06760670B2

公开(公告)日：2004-07-06

申请号：US09951689

申请日：2001-09-13

申请人： James D. Stoupis ,  David Lubkeman ,  Reto Buettner ,  David G. Hart

发明人： James D. Stoupis ,  David Lubkeman ,  Reto Buettner ,  David G. Hart

IPC分类号： G01R3100

CPC分类号： H02H1/00 ,  H02H3/36

摘要： The invention describes a method, system, device, and computer-readable medium having computer-executable instructions for classifying faults on an electrical power line. In particular, the invention permits the classification of crossover faults using a local measurement technique. The inventive method includes providing a first electrical power transmission line and a second electrical power transmission line, and monitoring the first electrical power transmission line to identify a crossover fault occurring between the first and the second electrical power transmission lines.