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：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）。

公开(公告)号：US5956220A

公开(公告)日：1999-09-21

申请号：US19321

申请日：1998-02-05

申请人： Damir Novosel ,  Yi Hu ,  Murari M. Saha

发明人： Damir Novosel ,  Yi Hu ,  Murari M. Saha

IPC分类号： H02H3/40 ,  H02H7/26 ,  H02H3/00

CPC分类号： H02H7/267 ,  H02H3/40

摘要： An adaptive distance relaying system provides improved performance for parallel circuit distance protection. The system utilizes the parallel circuit's current, when available, in conjunction with measurements of voltage and current on the protected line to compensate for the zero sequence current mutual coupling effect. The sequence current ratio (zero or negative sequence) is used to avoid incorrect compensation for relays on the healthy circuit. If the parallel circuit current is not available and the line operating status is, the best zero sequence current compensation factors are selected accordingly as a next level adaptation. If both the parallel circuit current and line operating status are unavailable, a fallback scheme that offers better results than classical distance protection schemes is employed.

摘要翻译： 自适应距离中继系统为并联电路距离保护提供了改进的性能。 该系统在可用时利用并联电路的电流与受保护线路上的电压和电流的测量结合，以补偿零序电流互耦效应。 顺序电流比（零或负序）用于避免健康电路上继电器的不正确补偿。 如果并联电路电流不可用并且线路运行状态是，则最佳的零序电流补偿因子被相应地选择为下一级适配。 如果并联电路电流和线路运行状态都不可用，则采用比传统距离保护方案更好的结果的回退方案。

公开(公告)号：US5805395A

公开(公告)日：1998-09-08

申请号：US766715

申请日：1996-12-13

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： H02H7/04 ,  H02H7/06

CPC分类号： H02H7/04 ,  H02H7/06

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. The half-cycle summation technique of the invention is a non-recursive digital technique which measures the per unit V/Hz value by summing the sampled data points in every half cycle of a sinusoidal input signal and dividing the sum with the ideal base sum value. When the input voltage signal is sampled at a reasonable frequency, the technique of the invention approximates the accurate per unit V/Hz value of the input voltage signal and thus obtains an accurate V/Hz characteristic directly without computing voltage and frequency separately.

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。 本发明的半周期求和技术是一种非递归数字技术，其通过将正弦输入信号的每半个周期中的采样数据点相加并且将和除以理想基本和值来测量每单位V / Hz值 。 当以合理的频率对输入电压信号进行采样时，本发明的技术近似于输入电压信号的每单位V / Hz值的准确度，从而直接获得精确的V / Hz特性，而不分别计算电压和频率。

公开(公告)号：US20110226072A1

公开(公告)日：2011-09-22

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

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：US06219591B1

公开(公告)日：2001-04-17

申请号：US09079983

申请日：1998-05-15

申请人： Khoi Tien Vu ,  Damir Novosel

发明人： Khoi Tien Vu ,  Damir Novosel

IPC分类号： G05D500

CPC分类号： G01R31/085 ,  H02J3/24

摘要： A Voltage Instability Predictor (VIP) estimates the proximity of a power system to voltage collapse in real time. The VIP can be implemented in a microprocessor-based relay whose settings are changed adaptively to reflect system changes. Only local measurements (voltage and current) at the bus terminal are required. Contrary to the most common strategy to maintain voltage stability, which is to shed blocks of load when the voltage drops below a certain fixed threshold, which threshold is difficult to select since voltage magnitudes are a poor indicator of how close the system is to a collapse, the inventive VIP detects this proximity to collapse by monitoring the relationship between the apparent impedance {overscore (Z)}app and the Thevenin-impedance circle.

摘要翻译： 电压不稳定性预测器（VIP）估计电力系统与电压崩溃的实时接近。 VIP可以在基于微处理器的继电器中实现，其设置自适应地改变以反映系统变化。 只需要总线端子的局部测量（电压和电流）。 与维持电压稳定性最常见的策略相反，当电压下降到一定的固定阈值以下时，这是阻止负载的块，因为电压幅度是系统接近崩溃的一个很差的指标 ，本发明的VIP通过监视视在阻抗（过滤（Z）} app和戴维南 - 阻抗圈之间的关系来检测这种接近于崩溃。

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：US5455776A

公开(公告)日：1995-10-03

申请号：US118000

申请日：1993-09-08

申请人： Damir Novosel

发明人： Damir Novosel

IPC分类号： G01R31/08 ,  G01R31/00

CPC分类号： G01R31/088

摘要： A fault location system comprises voltage/current transducers 10A, 10B located at terminals A and B, respectively; digital relays 12A and 12B respectively coupled to transducer blocks 10A and 10B; and a fault location estimation processor 14, which may comprise a substation controller at substation S.sub.A or substation S.sub.B, a relay at A or B, a stand alone computer at A or B, or a computer at a central location. The digital relays receive analog voltage and current signals (V.sub.A, I.sub.A, V.sub.B, I.sub.B) from the respective transducers and output digital phasor or oscillographic data to the fault location estimation block. The fault location estimation block is programmed to provide the fault location parameter m. The fault location estimation provided by the inventive technique is unaffected by the fault resistance, load current, mutual coupling effects from a parallel line, uncertainties in zero sequence values, shunt elements, and X/R characteristic of the system. The fault location can be estimated accurately even in cases of substantial resistance and load flow. In addition, the invention does not require synchronization of the data received from the respective A and B terminals, nor does it require pre-fault data or fault type selection.

摘要翻译： 故障定位系统分别包括位于端子A和B处的电压/电流换能器10A，10B; 分别耦合到换能器块10A和10B的数字继电器12A和12B; 以及故障位置估计处理器14，其可以包括在变电站SA或变电站SB处的变电站控制器，A或B处的继电器，A或B处的独立计算机，或位于中央位置的计算机。 数字继电器从相应的传感器接收模拟电压和电流信号（VA，IA，VB，IB），并将数字相量或示波数据输出到故障位置估计块。 故障定位估计块被编程为提供故障定位参数m。 由本发明技术提供的故障定位估计不受来自并行线路的故障电阻，负载电流，互耦效应，零序值，分流元件和系统的X / R特性的不确定性的影响。 即使在实质的电阻和负载流量的情况下，也可以准确地估计故障位置。 此外，本发明不要求从相应的A和B终端接收的数据同步，也不需要故障前数据或故障类型选择。

公开(公告)号：US08853897B2

公开(公告)日：2014-10-07

申请号：US13462606

申请日：2012-05-02

申请人： Hossein Safari Zadeh ,  Damir Novosel ,  Jesus Contreras-Espada

发明人： Hossein Safari Zadeh ,  Damir Novosel ,  Jesus Contreras-Espada

IPC分类号： H02K9/28 ,  H02K3/50 ,  H02K5/22

CPC分类号： H02K3/50 ,  H02K5/225 ,  H02K9/06 ,  H02K2203/09

摘要： A cooling system for bushings of an electric generator, which includes a casing housing a stator and a rotor connected to a rotor shaft activating at least a fan defining at least a high pressure zone and a low pressure zone. The generator has a plurality of phases electrically connected to hollow phase rings that are electrically connected to bushings supported by the casing and having cooling circuits to let a cooling medium pass through them to cool them. The outlets of the bushing cooling circuits are housed in the high pressure zone and are connected to inlets of the hollow phase rings. A method for cooling the bushings of an electric generator is also provided.

摘要翻译： 一种用于发电机衬套的冷却系统，其包括容纳定子的壳体和连接到转子轴的转子，所述转子轴至少激活至少限定至少高压区和低压区的风扇。 发电机具有电连接到中空相位环的多相，其电连接到由壳体支撑的衬套，并具有使冷却介质通过它们以冷却它们的冷却回路。 衬套冷却回路的出口被容纳在高压区中，并连接到空心相环的入口。 还提供了一种冷却发电机衬套的方法。