公开(公告)号：US5661664A

公开(公告)日：1997-08-26

申请号：US515274

申请日：1995-08-15

申请人： Damir Novosel ,  Arun G. Phadke

发明人： Damir Novosel ,  Arun G. Phadke

IPC分类号： G01R31/08 ,  H02H3/40

CPC分类号： H02H3/402 ,  G01R31/088

摘要： A one-terminal process for locating a fault associated with a transmission system is disclosed. The process is based on the principle fault sequence can be determined by a distribution factor in positive faults may be any defect among phases or ground. The process begins by one end of a transmission line. If the data is oscillographic data, measured data is in phasor form, or after phasors have been calculated determined. Thereafter, a decision is made whether the pre-fault data data is sound, an equation is selected to calculate the fault location decision is made whether the phase is a three-phase fault. Then, a employed to compensate for the fault through a resistance by measuring part of the apparent line impedance. If the fault is not a three-phase formula is not employed and the appropriate equation is selected for the fault location parameter. Accurate fault location techniques for also disclose. The system is insensitive to the zero sequence current information about the system source impedances is required.

摘要翻译： 公开了一种用于定位与传输系统相关的故障的单终端过程。 该过程是基于原理故障序列可以由分布因子确定的，在正断层中可能是相间或地面有任何缺陷。 该过程从传输线的一端开始。 如果数据是示波数据，则测量数据是相量形式，或者在相量计算确定之后。 此后，判定故障前数据是否为声音，选择方程式来计算故障位置判定是否为三相故障。 然后，通过测量表观线路阻抗的一部分，通过电阻来补偿故障。 如果故障不是三相公式，则不使用故障定位参数选择适当的方程。 准确的故障定位技术也披露。 系统对零序电流信息不敏感，需要系统源阻抗。

公开(公告)号：US08869637B2

公开(公告)日：2014-10-28

申请号：US13038523

申请日：2011-03-02

申请人： Hossein Safari Zadeh ,  Damir Novosel

发明人： Hossein Safari Zadeh ,  Damir Novosel

IPC分类号： H02K5/22 ,  H02K5/04 ,  H02K15/14 ,  H02K15/00

CPC分类号： H02K5/22 ,  H02K5/04 ,  H02K15/00 ,  H02K15/14

摘要： An electric generator (1) includes a casing (2) that envelops a stator (3) and a rotor (4). The casing (2) has an aperture (5) through which the generator casing inside (7) is inspectable during generator operation. A method includes inspecting during generator operation, through the aperture (5) of the casing (2), the casing inside (7).

摘要翻译： 发电机（1）包括包围定子（3）和转子（4）的壳体（2）。 壳体（2）具有孔（5），在发电机运行期间可以检查发电机壳体（7）内的孔（5）。 一种方法包括在发电机操作期间，通过壳体（2）的孔（5），壳体（7）内的检查。

公开(公告)号：US20130066480A1

公开(公告)日：2013-03-14

申请号：US13607496

申请日：2012-09-07

申请人： Mevludin Glavic ,  Muhidin Lelic ,  Damir Novosel

发明人： Mevludin Glavic ,  Muhidin Lelic ,  Damir Novosel

IPC分类号： G05F5/00

CPC分类号： H02J3/14 ,  H02J3/24 ,  H02J13/0006 ,  H02J2003/007 ,  Y02B70/3225 ,  Y02E60/728 ,  Y02E60/74 ,  Y02E60/76 ,  Y04S10/265 ,  Y04S10/30 ,  Y04S20/222 ,  Y04S40/22

摘要： The disclosure relates to a method of detecting and managing voltage instability in power systems operations. The disclosed method identifies and follows Thevenin and load impedance values as they fluctuate in a power system using synchrophasor measurements. The values are recursively estimated and entered into calculations to identify stability margins through a simple P-Q plane representation to determine if load shedding is necessary.

摘要翻译： 本公开涉及一种检测和管理电力系统操作中的电压不稳定性的方法。 所公开的方法在使用同步相机测量​​的电力系统中波动时识别和跟随戴维南和负载阻抗值。 这些值被递归地估计并输入到计算中以通过简单的P-Q平面表示来确定稳定裕度，以确定是否需要负载脱落。

公开(公告)号：US06397156B1

公开(公告)日：2002-05-28

申请号：US09192851

申请日：1998-11-17

申请人： Bernhard Bachmann ,  David G. Hart ,  Yi Hu ,  Damir Novosel ,  Murari M. Saha

发明人： Bernhard Bachmann ,  David G. Hart ,  Yi Hu ,  Damir Novosel ,  Murari M. Saha

IPC分类号： G01R2500

CPC分类号： H02H3/40 ,  H02H1/04

摘要： An accurate impedance measurement method for a power system transmission line is disclosed for improving various protection functions, i.e., distance protection and/or fault location estimation. The method is less sensitive to harmonics and other transient problems introduced to power systems by series capacitance and the like, and is easily incorporated into existing protective relays. In the method, a number (n) of current and voltage samples (Ik, Vk) representative of values of current and voltage waveforms are measured, respectively, at successive instants of time on a conductor in a power system. The number n is an integer greater than I and the index k takes on values of 1 to n. Resistance (R) and inductance (L) values are computed in accordance with an equation in which R and L are related to sums of differences in values of successive current and voltage samples. A prescribed power system function is then performed based on the computed R and L values.

摘要翻译： 公开了一种用于电力系统传输线路的精确阻抗测量方法，用于改进各种保护功能，即距离保护和/或故障位置估计。 该方法对通过串联电容等引入电力系统的谐波和其他瞬态问题较不敏感，并且容易地并入现有的保护继电器中。 在该方法中，分别在电力系统中的导体上的连续时刻分别测量表示电流和电压波形值的电流和电压样本数（Ik，Vk）的数量（n）。 数字n是大于I的整数，索引k取值为1到n。 电阻（R）和电感（L）值根据其中R和L与连续电流和电压样本的值的差的和相关的方程式来计算。 然后根据计算的R和L值执行规定的电力系统功能。

公开(公告)号：US06249230B1

公开(公告)日：2001-06-19

申请号：US09272017

申请日：1999-03-18

申请人： Thomas L. Baldwin ,  Damir Novosel ,  Ali F. Imece

发明人： Thomas L. Baldwin ,  Damir Novosel ,  Ali F. Imece

IPC分类号： G08B2100

CPC分类号： H02H3/17 ,  G01R31/025 ,  H02H3/042 ,  H02H3/165 ,  H02H3/33

摘要： A ground fault location system is used in a multi-phase ungrounded or high-impedance grounded power network. A signal generator is coupled to the network at a first location and generates for each network phase an individual non-DC voltage signal between such phase and ground. A ground fault detector is coupled to the network at a second location and has a summing device and an annunciator. The summing device is coupled to all of the phases of the network at such second location, sums any current passing therethrough, and produces a sum signal. The annunciator receives the sum signal and provides an indication when such signal is non-zero. Each phase of the network at the second location has a distribution current passing therethrough, the sum thereof normally being substantially zero and resulting in a substantially zero sum signal and the lack of an indication from the annunciator based on such distribution currents. When the second location is on a path between the first location and a ground fault, the individual voltage signal on at least one of the phases generates a fault current thereon through such path and results in a non-zero sum signal and an indication from the annunciator. When the second location is not on such path, none of the individual voltage signals generates a fault current on any phase through such path, resulting in a substantially zero sum signal and the lack of an indication from the annunciator.

摘要翻译： 接地故障定位系统用于多相不接地或高阻抗接地电网。 信号发生器在第一位置处耦合到网络，并且为每个网络相位产生这种相位和地之间的单个非直流电压信号。 接地故障检测器在第二位置处耦合到网络，并具有求和装置和信号器。 求和装置在这样的第二位置处耦合到网络的所有相位，对通过其中的任何电流求和，并产生和信号。 信号器接收和信号，并在这种信号不为零时提供指示。 在第二位置处的网络的每个阶段具有通过其的分配电流，其总和通常基本为零，并且导致基本上为零的和信号，并且基于这种分配电流缺少来自信号器的指示。 当第二位置在第一位置和接地故障之间的路径上时，至少一个相位上的单个电压信号通过这样的路径在其上产生故障电流，并且产生非零和信号和来自 报警器 当第二位置不在这样的路径上时，没有一个单独的电压信号通过这样的路径在任何相位上产生故障电流，导致基本上为零的和信号，并且没有来自信号器的指示。

公开(公告)号：US06453248B1

公开(公告)日：2002-09-17

申请号：US09119792

申请日：1998-07-21

申请人： David G. Hart ,  Damir Novosel ,  Steven A. Kunsman

发明人： David G. Hart ,  Damir Novosel ,  Steven A. Kunsman

IPC分类号： G01R3100

CPC分类号： G01R31/088 ,  G01R31/085 ,  G01R31/086 ,  H02H1/0015 ,  Y04S10/522

摘要： An improved high impedance fault (HIF) detection system comprises an analyzer located at a circuit breaker or substation with feeders, wherein the analyzer analyzes current and/or voltage waveforms to detect a HIF on the feeder or on one of a plurality of laterals coupled to the feeder; a plurality of remote outage detectors located respectively at corresponding customer sites, each remote outage detector including a mechanism to detect a loss of potential or power at the corresponding site; and a computer in communication with the analyzer and the remote outage detectors.

摘要翻译： 改进的高阻抗故障（HIF）检测系统包括位于具有馈线的断路器或变电站的分析仪，其中分析器分析电流和/或电压波形，以检测馈线上的HIF或多个耦合到 进料器; 分别位于相应的客户位置的多个远程停机检测器，每个远程停电检测器包括用于检测对应站点的电位或电力损失的机构; 以及与分析仪和远程停机检测器通信的计算机。

公开(公告)号：US5839093A

公开(公告)日：1998-11-17

申请号：US777623

申请日：1996-12-31

申请人： Damir Novosel ,  David Hart ,  Yi Hu ,  Jorma Myllymaki

发明人： Damir Novosel ,  David Hart ,  Yi Hu ,  Jorma Myllymaki

IPC分类号： G01R31/08 ,  H02H3/26

CPC分类号： G01R31/086

摘要： Both fault location and fault resistance of a fault are calculated by the present method and system. The method and system takes into account the effects of fault resistance and load flow, thereby calculating fault resistance by taking into consideration the current flowing through the distribution network as well as the effect of fault impedance. A direct method calculates fault location and fault resistance directly while an iterative fashion method utilizes simpler calculations in an iterative fashion which first assumes that the phase angle of the current distribution factor D.sub.s is zero, calculates an estimate of fault location utilizing this assumption, and then iteratively calculates a new value of the phase angle .beta..sub.s of the current distribution factor D.sub.s and fault location m until a sufficiently accurate determination of fault location is ascertained. Fault resistance is then calculated based upon the calculated fault location. The techniques are equally applicable to a three-phase system once fault type is identified.

摘要翻译： 通过本方法和系统计算故障位置和故障故障电阻。 该方法和系统考虑了故障电阻和负载流量的影响，从而通过考虑流经配电网络的电流以及故障阻抗的影响来计算故障电阻。 直接方法直接计算故障位置和故障电阻，而迭代方法以迭代方式利用更简单的计算，首先假设电流分布因子Ds的相位角为零，使用该假设计算故障位置的估计，然后 迭代地计算当前分布因子Ds和故障位置m的相位角βs的新值，直到确定故障位置的足够精确的确定。 然后根据计算出的故障位置计算故障电阻。 一旦发现故障类型，这些技术同样适用于三相系统。

公开(公告)号：US5832414A

公开(公告)日：1998-11-03

申请号：US939932

申请日：1997-09-29

申请人： David G. Hart ,  James D. Stoupis ,  Damir Novosel

发明人： David G. Hart ,  James D. Stoupis ,  Damir Novosel

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 new method of compensating for errors in phasor estimation due to oscillations caused by discrete fourier transforms used to estimate signal frequency 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. A non-oscillating phasor indicative of the instantaneous magnitude, angular frequency, and phase angle of the signal is generated based on the instantaneous frequency estimate. Instantaneous frequencies are averaged over a cycle of the signal to generate 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. 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： 提供了一种补偿由于用于估计信号频率的离散傅立叶变换引起的振荡引起的相量估计误差的新方法。 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。 基于瞬时频率估计产生指示信号的瞬时幅度，角频率和相位角的非振荡相量。 瞬时频率在信号的周期上平均以产生平均周期频率。 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。 通过将DFT窗口设置为与最接近平均周期频率的离散频率对应的DFT窗口进行调整。 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：US5671112A

公开(公告)日：1997-09-23

申请号：US647589

申请日：1996-05-13

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

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

IPC分类号： G01R19/04 ,  H02H7/04 ,  H02H3/18

CPC分类号： H02H7/04 ,  G01R19/04

摘要： A system for implementing accurate V/Hz value measurement and trip time determination for generator/transformer overexcitation protection independent of the conventional frequency tracking and phasor estimation based on Discrete Fourier Transformation (DFT) techniques. A sampled sinusoidal voltage signal is passed through a digital integrator and the magnitude of the digital integrator's output is measured as representative of the V/Hz ratio. The digital integrator is implemented in software using a difference equation in a generator protection unit. The technique may be used with either a fixed or a variable sampling frequency. When the sampling frequency is variable, the filter coefficients of the digital integrator are recalculated on-line each time the sampling frequency is changed, and a new value for the peak magnitude of the output of the digital integrator is calculated using the recalculated filter coefficients. Non-linear frequency response characteristics of the voltage sensors and non-ideal characteristics of the digital integrator are also adjusted using the measured frequency and error-frequency characteristics of the particular digital integrator and voltage sensors used.

摘要翻译： 一种用于实现发电机/变压器过励磁保护的精确V / Hz值测量和跳闸时间确定的系统，与传统的基于离散傅里叶变换（DFT）技术的频率跟踪和相量估计无关。 采样的正弦电压信号通过数字积分器，并且数字积分器的输出的幅度被测量为代表V / Hz比。 数字积分器采用发电机保护单元中的差分方程软件实现。 该技术可以与固定或可变采样频率一起使用。 当采样频率可变时，每次采样频率改变时，数字积分器的滤波器系数在线重新计算，并且使用重新计算的滤波器系数计算数字积分器的输出的峰值幅度的新值。 电压传感器的非线性频率响应特性和数字积分器的非理想特性也使用所使用的特定数字积分器和电压传感器的测量频率和误差频率特性进行调整。

公开(公告)号：US20110215663A1

公开(公告)日：2011-09-08

申请号：US13033691

申请日：2011-02-24

申请人： Hossein Safari Zadeh ,  Damir Novosel

发明人： Hossein Safari Zadeh ,  Damir Novosel

IPC分类号： H02K11/00

CPC分类号： H02K3/505 ,  F16B2/04

摘要： A device (10) for connecting together end winding parts (1) of stator bars (2) of an electric generator includes a first and a second element (11, 12) having sloped facing surfaces (13) defining two trapezoidal seats each housing a trapezoidal cursor (14), and one or two screws (15), axially fixed and rotatably movable with respect to the first and second element (11, 12) and having a threaded portion inserted in a threaded through hole (17) of the cursor (14).

摘要翻译： 一种用于将发电机的定子线棒（2）的端部绕组部分（1）连接在一起的装置（10）包括具有倾斜面对表面（13）的第一和第二元件（11,12），该第一和第二元件限定两个梯形座， 梯形光标（14）和一个或两个螺钉（15），其相对于第一和第二元件（11,12）轴向固定和可旋转地移动，并且具有插入光标的螺纹通孔（17）中的螺纹部分 （14）。