公开(公告)号：US5959243A

公开(公告)日：1999-09-28

申请号：US8690

申请日：1998-01-16

申请人： Patrick L. Thiel

发明人： Patrick L. Thiel

IPC分类号： G01R11/04 ,  H05K5/03

CPC分类号： G01R11/04

摘要： There is disclosed a plastic mating ring for a meter cover and base assembly. The mating ring includes provisions for attaching the meter cover to the mating ring and the mating ring also includes provisions for reducing distortions of the cylindrical wall of the mating ring when the ring is pulled tight against the edge of the meter cover during twisting of the cover onto the meter base.

摘要翻译： 公开了一种用于仪表盖和基座组件的塑料配合环。 配合环包括用于将仪表盖附接到配合环的配置，并且配合环还包括用于减小当将环在盖子的扭转期间紧紧地抵靠在仪表盖的边缘处被拉紧时配合环的圆柱形壁的变形的设置 到仪表底座。

公开(公告)号：US5912604A

公开(公告)日：1999-06-15

申请号：US794491

申请日：1997-02-04

申请人： Ian James Harvey ,  Aftab H. Khan ,  Robert A. Smith ,  James E. Smith

发明人： Ian James Harvey ,  Aftab H. Khan ,  Robert A. Smith ,  James E. Smith

IPC分类号： H01H9/16 ,  H01H33/666 ,  H01H75/00 ,  H01H75/04 ,  H01H33/66

CPC分类号： H01H33/6662 ,  H01F2007/1669 ,  H01H2009/0292 ,  H01H2033/6623 ,  H01H33/027 ,  H01H75/00 ,  H01H75/04 ,  H01H9/16

摘要： An electromagnetic actuator and an automatic recloser incorporating such actuator are disclosed. The actuator is shown to include a housing, a permanent magnet member, a coil, an armature, mounted to move axially within the housing between first and second positions, and a non-magnetic spacer. The armature, when in the second position, is spaced a distance from the housing by the spacer. The spacer is mounted to stop movement of the armature in the second position. In the preferred embodiment, the permanent magnet member includes a core and a number of magnet segments attached thereto. It is especially preferred for each of the permanent magnet segments to be arcuate shaped and that each segment be polarized substantially radially or in a direction parallel to the center radius of each segment. In a preferred embodiment, the housing is formed from a material having a high permeability and the spacer is formed from material having a relative permeability close to one or from a substantially non-magnetic material, such as acetal resin.The circuit recloser is shown to include the bistable magnetic actuator, a contact switch, a connecting member, connected between the actuator the contact switch and a spring, connected to bias the connecting member in relation to the contact switch. When the actuator is in its second position the end of the connecting member is spaced from the end of the contact switch, i.e., over travel is present. An indicator is provided for indicating whether the contact switch is open or closed.

摘要翻译： 公开了一种电磁致动器和包括这种致动器的自动重合器。 致动器被示出为包括壳体，永磁体构件，线圈，衔铁，安装成在第一和第二位置之间轴向移动，以及非磁性间隔件。 当处于第二位置时，电枢通过间隔件与壳体隔开一段距离。 安装间隔件以阻止衔铁在第二位置的移动。 在优选实施例中，永磁体构件包括芯部和附接到其上的多个磁体段。 特别优选的是，每个永磁体段都是弧形的，并且每个段基本上径向地或者在平行于每个段的中心半径的方向上极化。 在优选实施例中，壳体由具有高磁导率的材料形成，并且间隔件由具有接近于1的相对磁导率或基本上非磁性材料（例如缩醛树脂）的材料形成。 电路重合器被示为包括双稳态磁致动器，接触开关，连接构件，连接在致动器接触开关和弹簧之间，连接到相对于接触开关偏压连接构件。 当致动器处于其第二位置时，连接构件的端部与接触开关的端部间隔开，即存在过度行程。 提供一个指示器，用于指示接触开关是打开还是关闭。

公开(公告)号：US5909656A

公开(公告)日：1999-06-01

申请号：US811646

申请日：1997-03-05

申请人： Lifeng Yang

发明人： Lifeng Yang

IPC分类号： G06F17/14

CPC分类号： G06F17/14

摘要： A method for applying a modified Discrete Fourier Transform (DFT) in a protective relaying system involves five basic steps: The first step, S1, comprises measuring voltage and current time-domain samples v(k), i(k). The next step, S2, involves the computation of the DFT of the DC component(s) (V.sub.DC (k), I.sub.DC (k)) of the voltage and current samples. The next step, S3, comprises the computation of the regular DFT (V(k), I(k)). Next, in step S4, the modified DFTs are computed as, V.sub.m (k)=V(k)-V.sub.DC (k), and I.sub.m (k)=I(k)-I.sub.DC (k). In step S5 the modified DFT values representing the desired phasors are employed to carry out various protective relaying functions.

摘要翻译： 在保护性中继系统中应用修正离散傅立叶变换（DFT）的方法包括五个基本步骤：第一步骤S1包括测量电压和当前时域样本v（k），i（k）。 下一步骤S2涉及对电压和电流样本的DC分量（VDC（k），IDC（k））的DFT的计算。 下一步骤S3包括常规DFT（V（k），I（k））的计算。 接下来，在步骤S4中，修正的DFT被计算为Vm（k）= V（k）-VDC（k），Im（k）= I（k）-IDC（k）。 在步骤S5中，采用表示期望相量的修正DFT值来执行各种保护中继功能。

公开(公告)号：US5835331A

公开(公告)日：1998-11-10

申请号：US984204

申请日：1997-12-03

申请人： Kenneth C. Shuey

发明人： Kenneth C. Shuey

IPC分类号： H02J13/00 ,  H01H47/26

CPC分类号： H02J13/00 ,  Y10T307/766 ,  Y10T307/858 ,  Y10T307/865

摘要： A very low cost method of driving the coil of a meter disconnect switch utilizes the 60 Hz signals from an existing power supply rectifier to generate properly phased gate drive signals to SCRS, with only one stage of isolation.

摘要翻译： 驱动仪表断路开关的线圈的非常低成本的方法利用来自现有电源整流器的60Hz信号来产生适当的相位栅极驱动信号到SCRS，只有一个隔离级。

公开(公告)号：US5832413A

公开(公告)日：1998-11-03

申请号：US939514

申请日：1997-09-29

申请人： Joseph P. Benco ,  Frederick P. Perfect ,  David G. Hart ,  James D. Stoupis

发明人： Joseph P. Benco ,  Frederick P. Perfect ,  David G. Hart ,  James D. Stoupis

IPC分类号： G01R19/25 ,  G01R23/00 ,  G01R23/16 ,  G01R23/10

CPC分类号： G01R19/2513 ,  G01R23/16 ,  G01R23/00

摘要： A method for estimating phasors and tracking the frequency of a signal during frequency ramping is provided. The method uses a variable N-point DFT periodically to compute one or more phasors based on data acquired from one or more sampled signals. The period between DFT computations is a predetermined number of sample periods. After each DFT computation, the change in phasor angle between the current phasor estimate and the most previous phasor estimate is determined and used to estimate the instantaneous frequency of the signal. The current instantaneous frequency estimate and the most previous instantaneous frequency estimate are averaged to compute an average cycle frequency. In addition, a number of discrete frequencies and corresponding DFT windows based on a fixed sampling rate and a predetermined fundamental frequency of the signal are defined and used in estimating the instantaneous frequency. Once the average cycle frequency is determined the DFT window is adjusted by setting it equal to the DFT window corresponding to the discrete frequency closest to the average cycle frequency. A generator protection system analyzing voltage and current signals output from a generator is also provided. The voltage and current signals are monitored by respective voltage and current sensors to produce a plurality of signals representative of voltage and current characteristics of the generator. The system comprises components for receiving and sampling signal input, and for processing the samples according to the inventive method.

摘要翻译： 提供了一种用于在频率斜坡期间估计相量并跟踪信号频率的方法。 该方法使用可变N点DFT周期性地基于从一个或多个采样信号获取的数据来计算一个或多个相量。 DFT计算之间的周期是预定数量的采样周期。 在每个DFT计算之后，确定当前相量估计与最先前相量估计之间的相量角的变化，并用于估计信号的瞬时频率。 对当前瞬时频率估计和最先前的瞬时频率估计进行平均以计算平均周期频率。 另外，基于固定采样率和信号的预定基频定义了多个离散频率和相应的DFT窗口，并用于估计瞬时频率。 一旦确定平均周期频率，则通过将DFT窗口设置为等于最接近平均周期频率的离散频率的DFT窗口来调整DFT窗口。 还提供了分析从发电机输出的电压和电流信号的发电机保护系统。 电压和电流信号由相应的电压和电流传感器监测，以产生代表发电机的电压和电流特性的多个信号。 该系统包括用于接收和采样信号输入的组件，并且用于根据本发明的方法处理样本。

公开(公告)号：USD398313S

公开(公告)日：1998-09-15

申请号：US66810

申请日：1997-02-21

申请人： Jimmie R. Allen

设计人： Jimmie R. Allen

公开(公告)号：US5798939A

公开(公告)日：1998-08-25

申请号：US950333

申请日：1997-10-14

申请人： J. Rafael Ochoa ,  Robert L. Hirt

发明人： J. Rafael Ochoa ,  Robert L. Hirt

IPC分类号： H02J3/00 ,  G06F17/00

CPC分类号： H02J3/00 ,  G06Q30/0283 ,  H02J3/14 ,  H02J2003/007 ,  Y02B70/3225 ,  Y02E40/76 ,  Y02E60/76 ,  Y04S10/545 ,  Y04S20/222 ,  Y04S40/22 ,  Y04S50/14

摘要： A computer workstation-based interactive tool for assessing the reliability of power systems is disclosed. This tool can be used to determine the effect on the reliability of both substations and bulk generation and transmission systems of system additions, design alternatives, maintenance practices, substation configurations, and spare part policies. Each utility using the present invention is modeled analytically. The model includes load characteristics, demand projections, voltage profiles, energy and operating constraints, operator and automatic responses to the occurrence of contingent events, generating unit dispatch, contingency remedial actions, load shedding practices, demand-side management, and equipment failure modes including planned and unplanned maintenance.

摘要翻译： 公开了一种用于评估电力系统可靠性的基于计算机工作站的交互式工具。 该工具可用于确定变电所的可靠性，系统添加的批量生成和传输系统，设计备选方案，维护做法，变电站配置和备件策略的影响。 使用本发明的每个实用程序被分析地建模。 该模型包括负载特性，需求预测，电压曲线，能量和操作限制，运营商和自动应对或有事件的发生，生成单元调度，应急补救措施，卸载实践，需求侧管理和设备故障模式，包括 计划和计划外的维护。

公开(公告)号：US5770897A

公开(公告)日：1998-06-23

申请号：US714757

申请日：1996-09-16

申请人： Vinod N. Bapat ,  John G. Reckleff ,  Per A. Danfors

发明人： Vinod N. Bapat ,  John G. Reckleff ,  Per A. Danfors

IPC分类号： H01H9/54 ,  H02J3/38 ,  H02J9/06 ,  H01H83/00

CPC分类号： H02J9/06 ,  H02J3/38 ,  H01H2300/018 ,  H01H9/548 ,  Y10T307/615 ,  Y10T307/647 ,  Y10T307/735 ,  Y10T307/826 ,  Y10T307/839

摘要： Methods and apparatus for switching a load between first and second sources is shown to include first and second solid state switches connected to the load. First and second mechanical breakers are connected between the switches and the sources so that each source is connected to the load through a circuit breaker and solid state switch. A controller is connected to sense the voltage from the first and second sources. The controller is connected to the first and second switches and the first and second mechanical breakers. The controller senses the phase difference between the voltages from the first and second sources. The controller causes the first and second mechanical breakers to open and close in response to sensing the phase difference between the sources. The first and second mechanical breakers can include medium voltage vacuum breakers. In a preferred embodiment, when the controller senses that the phase difference between sources is more than 30 degrees out of phase, the controller will open the circuit breaker connected to the alternate source. In this manner voltage stress on the solid state switching devices is minimized.

摘要翻译： 示出了用于在第一和第二源之间切换负载的方法和装置，包括连接到负载的第一和第二固态开关。 第一和第二机械断路器连接在开关和源之间，使得每个源通过断路器和固态开关连接到负载。 连接控制器以感测来自第一和第二源的电压。 控制器连接到第一和第二开关以及第一和第二机械断路器。 控制器感测来自第一和第二源的电压之间的相位差。 响应于感测源之间的相位差，控制器使得第一和第二机械断路器打开和关闭。 第一和第二机械断路器可以包括中压真空断路器。 在优选实施例中，当控制器感测到源极之间的相位差超过30度异相时，控制器将打开连接到备用源的断路器。 以这种方式，固态开关器件的电压应力被最小化。

公开(公告)号：US5721689A

公开(公告)日：1998-02-24

申请号：US574357

申请日：1995-12-18

申请人： David Hart ,  Yi Hu ,  Damir Novosel ,  Robert Smith

发明人： David Hart ,  Yi Hu ,  Damir Novosel ,  Robert Smith

IPC分类号： G01R19/25 ,  G01R23/00 ,  G01R23/16 ,  G01R23/10 ,  H03M1/00

CPC分类号： G01R23/16 ,  G01R19/2513 ,  G01R23/00

摘要： A method and system for estimating phasors and tracking the frequency of a signal is provided. The method uses a variable N-point DFT to compute one or more phasors based on data acquired from one or more sampled signals. At each sampling interval the change in phasor angle between the current sampling interval and the previous sampling interval is determined and used to estimate the instantaneous frequency of the signal. Instantaneous frequencies are averaged over a cycle of the signal. In addition, a number of discrete frequencies and corresponding DFT windows based on a fixed sampling rate and a predetermined fundamental frequency of the signal are defined and used in estimating the instantaneous frequency. Once the average cycle frequency is determined the DFT window is adjusted by setting it equal to the DFT window corresponding to the discrete frequency closest to the average cycle frequency.

摘要翻译： 提供了一种用于估计相量并跟踪信号频率的方法和系统。 该方法使用可变N点DFT来基于从一个或多个采样信号获取的数据来计算一个或多个相量。 在每个采样间隔，确定当前采样间隔和先前采样间隔之间的相量角的变化，并用于估计信号的瞬时频率。 瞬时频率在信号的周期上平均。 另外，基于固定采样率和信号的预定基频定义了多个离散频率和相应的DFT窗口，并用于估计瞬时频率。 一旦确定平均周期频率，则通过将DFT窗口设置为等于最接近平均周期频率的离散频率的DFT窗口来调整DFT窗口。

公开(公告)号：US5694108A

公开(公告)日：1997-12-02

申请号：US637935

申请日：1996-05-01

申请人： Kenneth C. Shuey

发明人： Kenneth C. Shuey

IPC分类号： H04B3/56 ,  H04M11/04

CPC分类号： H04B3/56 ,  H04B2203/5408 ,  H04B2203/5425 ,  H04B2203/5445 ,  H04B2203/5458 ,  H04B2203/5483 ,  H04B2203/5491

摘要： Methods and apparatus for establishing communications between electrical and electronic devices utilizing existing power signal distribution networks are disclosed. In such methods and apparatus the transmitting and receiving components of such devices are coupled between line and ground. Such coupling is achieved utilizing a coupler, a first frequency reactive device, such as a drain coil or inductor, connected in series with neutral and a second frequency reactive device, such as a capacitor connected between neutral ground. For use with existing electronic equipment, an adaptor for coupling the communications signal to a power signal distribution network is also disclosed.

摘要翻译： 公开了利用现有功率信号分配网络在电气和电子设备之间建立通信的方法和装置。 在这种方法和装置中，这种装置的发射和接收部件在线路和地之间耦合。 这种耦合是利用耦合器，与中性点串联连接的第一频率无功装置，例如漏极线圈或电感器以及连接在中性线之间的电容器的第二频率无功装置来实现的。 为了与现有的电子设备一起使用，还公开了一种将通信信号耦合到电力信号分配网络的适配器。