公开(公告)号：US08847603B2

公开(公告)日：2014-09-30

申请号：US13747188

申请日：2013-01-22

申请人： Zoran Gajic

发明人： Zoran Gajic

IPC分类号： G01R31/14 ,  G01R31/02 ,  G01R31/34 ,  H02H3/17

CPC分类号： G01R31/025 ,  G01R31/34 ,  H02H3/17

摘要： An arrangement to detect a ground fault in an AC electric circuit including an electric machine having a neutral point connecting to a neutral point and a terminal side, and a unit transformer connected to the terminal side of the machine, wherein the arrangement includes a signal injection unit, a voltage transformer having a primary winding connected to the terminal side of the electric machine and a secondary winding that is open delta-connected, an instrument transformer having a primary winding connected to the neutral point of the electric machine and a secondary winding, and a ground fault detecting unit. The signal injection unit is configured to inject a signal to the secondary winding of the voltage transformer. The instrument transformer is configured to measure the resultant injected signal at its secondary winding The ground fault detecting unit is configured to detect a ground fault based on the measured signal.

摘要翻译： 一种用于检测包括具有连接到中性点和终端侧的中性点的电机的交流电路中的接地故障的装置以及连接到所述机器的端子侧的单元变压器，其中所述装置包括信号注入 单元，具有连接到电机的端子侧的初级绕组的电压互感器和开放式三角形连接的次级绕组，具有连接到电机的中性点的初级绕组的仪表变压器和次级绕组， 和接地故障检测单元。 信号注入单元被配置为向变压器的次级绕组注入信号。 仪表变压器被配置为在其次级绕组处测量合成的注入信号。接地故障检测单元被配置为基于测量的信号来检测接地故障。

公开(公告)号：US20140117912A1

公开(公告)日：2014-05-01

申请号：US14147017

申请日：2014-01-03

申请人： Zoran Gajic ,  Mustafa Ibrahim ,  Antonis Marinopoulos ,  Pedro Rodriguez ,  Jianping Wang ,  Liwei Wang

发明人： Zoran Gajic ,  Mustafa Ibrahim ,  Antonis Marinopoulos ,  Pedro Rodriguez ,  Jianping Wang ,  Liwei Wang

IPC分类号： H02H3/04

CPC分类号： H02H3/04 ,  G01R31/343 ,  H02H7/06 ,  H02P29/0241

摘要： A system, method and computer program product for monitoring including detecting internal faults especially inter-turn faults of a synchronous generator and thus protecting the synchronous generator. The synchronous generator includes a winding for each phase of a power network, a terminal for each phase arranged on a terminal side of the synchronous generator, and connected to the respective winding, the terminals on the terminal side are connected to an electrical power network, and the synchronous generator is arranged to input power to the electrical power network by means of the terminals.

摘要翻译： 一种用于监测的系统，方法和计算机程序产品，包括检测内部故障，特别是同步发电机的匝间故障，从而保护同步发电机。 同步发电机包括用于电网的每相的绕组，布置在同步发电机的端子侧的每相的端子，并连接到各个绕组，端子侧的端子连接到电力网络， 并且同步发电机被设置成通过端子向电力网络输入电力。

公开(公告)号：US07873496B2

公开(公告)日：2011-01-18

申请号：US11629775

申请日：2006-08-24

申请人： Zoran Gajic

发明人： Zoran Gajic

IPC分类号： G06F19/00

CPC分类号： H02H7/045 ,  H02H3/286

摘要： A method and a device for fault detection in an n-winding, three-phase power transformer. For each of the windings (Wi) the three phase currents (IL1—Wi; IL2—Wi; IL3—Wi) are measured. For each of the windings (Wi) deciding if a zero sequence current (I0—Wi) reduction is to be performed depending on at least one user setting (kWi) and if so, deducting the zero sequence current (I0—Wi) from each of the three phase currents (IL1—Wi; IL2—Wi; IL3—Wi). For each of the windings (Wi) generating normalized currents by performing a magnitude compensation and a phase angle shift compensation on the results of the previous step. For each of the three phases (Lx) comparing the normalized current of a single winding with the normalized currents of all other windings. For each phase (Lx) generating a fault signal, if a difference between the single winding (W1) and all other windings (W2, . . . , Wn) exceeds a predefined level.

摘要翻译： 一种用于n绕组三相电力变压器故障检测的方法和装置。 对于每个绕组（Wi），测量三相电流（IL1-Wi; IL2-Wi; IL3-Wi）。 对于每个绕组（Wi），决定是否根据至少一个用户设置（kWi）执行零序电流（I0-Wi）减小，并且如果是，则从每一个减去零序电流（I0-Wi） 的三相电流（IL1-Wi; IL2-Wi; IL3-Wi）。 对于通过对前一步骤的结果执行幅度补偿和相位角偏移补偿来产生归一化电流的每个绕组（Wi）。 将单个绕组的归一化电流与所有其他绕组的归一化电流进行比较的三相（Lx）中的每一个相位。 对于产生故障信号的每个相位（Lx），如果单绕组（W1）与所有其它绕组（W2，...，Wn）之间的差超过预定义的电平。

公开(公告)号：US20050239489A1

公开(公告)日：2005-10-27

申请号：US11056077

申请日：2005-02-11

申请人： Lijun Qian ,  Zoran Gajic

发明人： Lijun Qian ,  Zoran Gajic

IPC分类号： H04B7/005 ,  H04Q7/20

CPC分类号： H04W52/24 ,  H04W52/08 ,  H04W52/223 ,  H04W52/226 ,  H04W52/58

摘要： The present invention relates to a method and system for closed loop power control in a mobile communication system. Error is determined between a target signal-to-interference (SIR) and a received SIR. A power control scheme at a power controller of a base station determines a power change that is proportional to the error. Gain of the power controller is selected to achieve minimum error at a subsequent time instant.

摘要翻译： 本发明涉及移动通信系统中闭环功率控制的方法和系统。 在目标信号干扰（SIR）和接收SIR之间确定误差。 在基站的功率控制器处的功率控制方案确定与误差成正比的功率变化。 选择功率控制器的增益以在随后的时刻实现最小误差。

公开(公告)号：US06944470B2

公开(公告)日：2005-09-13

申请号：US10240924

申请日：2001-04-06

申请人： Lijun Qian ,  Zoran Gajic

发明人： Lijun Qian ,  Zoran Gajic

IPC分类号： H04B7/005 ,  H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/24 ,  H04W52/08 ,  H04W52/223 ,  H04W52/226 ,  H04W52/58

摘要： A system for closed loop power control in a mobile communication system comprises error determination process for determining an error between a target SIR and a received SIR (12, 14) and a power control scheme for determining a power change associated with error (18). As a result, the system controls the gain of power transmission (19) in order to achieve minimum error at a subsequent time instant.

摘要翻译： 用于移动通信系统中的闭环功率控制的系统包括用于确定目标SIR与接收SIR（12,14）之间的误差的误差确定处理和用于确定与误差（18）相关联的功率变化的功率控制方案。 因此，系统控制电力传输的增益（19），以便在随后的时刻实现最小误差。

公开(公告)号：US08791730B2

公开(公告)日：2014-07-29

申请号：US13876320

申请日：2010-11-09

申请人： Youyi Li ,  Bin Su ,  Ying Yang ,  Torbjorn Einarsson ,  Zoran Gajic

发明人： Youyi Li ,  Bin Su ,  Ying Yang ,  Torbjorn Einarsson ,  Zoran Gajic

IPC分类号： H03L7/00

CPC分类号： H03L7/08 ,  H02H3/283 ,  H02H3/30 ,  H02H7/263 ,  H04J3/0667

摘要： A synchronization method for current differential protection comprises: selecting a point on the transmission line protected by the current differential protection; measuring the current and the voltage of each of the terminals of said transmission line; calculating the compensating voltage at the selected point respectively according to the measured current and the voltage of the each terminal; detecting and calculating the synchronization error by comparing all the compensating voltages.

摘要翻译： 电流差动保护的同步方法包括：选择由电流差动保护保护的传输线上的点; 测量所述传输线的每个端子的电流和电压; 根据测量的电流和每个端子的电压分别计算所选点处的补偿电压; 通过比较所有补偿电压来检测和计算同步误差。

公开(公告)号：US20130193979A1

公开(公告)日：2013-08-01

申请号：US13747188

申请日：2013-01-22

申请人： Zoran Gajic

发明人： Zoran Gajic

IPC分类号： G01R31/02

CPC分类号： G01R31/025 ,  G01R31/34 ,  H02H3/17

摘要： An arrangement to detect a ground fault in an AC electric circuit including an electric machine having a neutral point connecting to a neutral point and a terminal side, and a unit transformer connected to the terminal side of the machine, wherein the arrangement includes a signal injection unit, a voltage transformer having a primary winding connected to the terminal side of the electric machine and a secondary winding that is open delta-connected, an instrument transformer having a primary winding connected to the neutral point of the electric machine and a secondary winding, and a ground fault detecting unit. The signal injection unit is configured to inject a signal to the secondary winding of the voltage transformer. The instrument transformer is configured to measure the resultant injected signal at its secondary winding The ground fault detecting unit is configured to detect a ground fault based on the measured signal.

摘要翻译： 一种用于检测包括具有连接到中性点和终端侧的中性点的电机的交流电路中的接地故障的装置以及连接到所述机器的端子侧的单元变压器，其中所述装置包括信号注入 单元，具有连接到电机的端子侧的初级绕组的电压互感器和开放式三角形连接的次级绕组，具有连接到电机的中性点的初级绕组的仪表变压器和次级绕组， 和接地故障检测单元。 信号注入单元被配置为向变压器的次级绕组注入信号。 仪表变压器被配置为在其次级绕组处测量合成的注入信号。接地故障检测单元被配置为基于测量的信号来检测接地故障。

公开(公告)号：US20130181755A1

公开(公告)日：2013-07-18

申请号：US13876320

申请日：2010-11-09

申请人： Youyi Li ,  Bin Su ,  Ying Yang ,  Torbjorn Einarsson ,  Zoran Gajic

发明人： Youyi Li ,  Bin Su ,  Ying Yang ,  Torbjorn Einarsson ,  Zoran Gajic

IPC分类号： H03L7/08

CPC分类号： H03L7/08 ,  H02H3/283 ,  H02H3/30 ,  H02H7/263 ,  H04J3/0667

摘要： A synchronization method for current differential protection comprises: selecting a point on the transmission line protected by the current differential protection; measuring the current and the voltage of each of the terminals of said transmission line; calculating the compensating voltage at the selected point respectively according to the measured current and the voltage of the each terminal; detecting and calculating the synchronization error by comparing all the compensating voltages.

摘要翻译： 电流差动保护的同步方法包括：选择由电流差动保护保护的传输线上的点; 测量所述传输线的每个端子的电流和电压; 根据测量的电流和每个端子的电压分别计算所选点处的补偿电压; 通过比较所有补偿电压来检测和计算同步误差。

公开(公告)号：US08972209B2

公开(公告)日：2015-03-03

申请号：US13968814

申请日：2013-08-16

申请人： Zoran Gajic ,  Jianping Wang ,  Mustafa Ibrahim

发明人： Zoran Gajic ,  Jianping Wang ,  Mustafa Ibrahim

IPC分类号： G01R31/00 ,  G01R31/02 ,  H02H7/16

CPC分类号： G01R31/028 ,  H02H7/16

摘要： A method for detecting an internal failure in a capacitor bank connected in one phase or more phases respectively to a power system. The capacitor bank includes a plurality of capacitor units. Each of the capacitor units includes a plurality of capacitor elements connected in parallel and/or series. The capacitor units are further divided into two strings and a current transformer is arranged in the midpoints of the two strings so that the capacitor units are further divided into four quadrants and the internal failure(s) may occur in one or more capacitor elements or units and involves one or more capacitor quadrants. The method includes initiating an alarm and/or a trip signal when the determined total number of internal elements failures exceeds a first or a second threshold value.

摘要翻译： 一种用于检测在一相或更多相中连接到电力系统的电容器组中的内部故障的方法。 电容器组包括多个电容器单元。 每个电容器单元包括并联和/或串联连接的多个电容器元件。 电容器单元进一步分成两个串，并且电流互感器布置在两个串的中点，使得电容器单元进一步分成四个象限，并且内部故障可能发生在一个或多个电容器元件或单元中 并涉及一个或多个电容器象限。 该方法包括当所确定的内部元件故障的总数超过第一或第二阈值时启动报警和/或跳闸信号。

公开(公告)号：US08792216B2

公开(公告)日：2014-07-29

申请号：US13743005

申请日：2013-01-16

申请人： Zoran Gajic

发明人： Zoran Gajic

IPC分类号： H02H7/16

CPC分类号： H02H7/16 ,  H02J3/1828 ,  Y02E40/30

摘要： A method for protecting against a failure within a multi-phase capacitor bank including a plurality of capacitor units each including a plurality of capacitor elements connected to each other, wherein capacitor units are connected to each other and the failure may involve two neighboring capacitor units. The method includes steps of measuring the current of each individual phase of the capacitor bank, calculating the magnitude of an unbalanced current based on the measured currents, measuring the voltage of each individual phase of the capacitor bank, calculating the magnitude of an unbalanced voltage based on the measured voltages, determining an operating point based on the calculated magnitudes of the unbalanced current and the unbalanced voltage, examining where the defined operating point is located in a specified operating region, and initializing a trip signal based on the location of the defined operating point in the specified operating region.

摘要翻译： 一种用于防止在多相电容器组中的故障的方法，包括多个电容器单元，每个电容器单元包括彼此连接的多个电容器元件，其中电容器单元彼此连接，并且故障可能涉及两个相邻的电容器单元。 该方法包括以下步骤：测量电容器组的每个单相的电流，基于测量的电流计算不平衡电流的大小，测量电容器组的每个相的电压，计算不平衡电压的幅度 在测量的电压上，基于计算出的不平衡电流的大小和不平衡电压来确定工作点，检查定义的工作点位于指定的工作区域中的位置，以及基于所定义的工作的位置初始化跳闸信号 指向指定的操作区域。