公开(公告)号：US20210111565A1

公开(公告)日：2021-04-15

申请号：US17122623

申请日：2020-12-15

申请人： Landis+Gyr Innovations, Inc.

发明人： Matt Karlgaard ,  Keith Torpy

IPC分类号： H02J3/38 ,  H02J13/00 ,  G01R22/06 ,  H02H3/52

摘要： A DER (distributed energy resource) device includes a metrology module and a communications module. The metrology module monitors the output of the DER device and the communications module provides bidirectional communications across a communications network to control the DER device. The control of the DER devices may include commands to connect the DER device to the grid, to disconnect the DER device to the grid, to connect the DER device to the premises, or to adjust a power characteristic of the output of the DER device.

公开(公告)号：US10742018B2

公开(公告)日：2020-08-11

申请号：US16193861

申请日：2018-11-16

申请人： LSIS CO., LTD.

发明人： Jaeshik Yoon ,  Hyunyoung Jung ,  Jaeyoung Yu

IPC分类号： H02H3/33 ,  H02H3/52 ,  H02H3/32 ,  H02H1/00 ,  H02H3/05

摘要： An earth leakage circuit breaker includes a current sensing unit configured to sense current in a circuit, a converter configured to detect a fundamental wave component and a specific harmonic component from the sensed current, the specific harmonic component being one of a plurality of harmonic components, and a controller. The controller is configured to compare a harmonic component ratio with a threshold component ratio, to determine whether the sensed current is abnormal current, and to control cutoff of the circuit according to the result of determination. The harmonic component ratio is a ratio of the specific harmonic component to the fundamental wave component. The converter is configured to convert the sensed current from an analog signal into digital data and to perform Fourier transform with respect to the converted digital data to detect the fundamental wave component and the specific harmonic component.

公开(公告)号：US10649020B2

公开(公告)日：2020-05-12

申请号：US15590164

申请日：2017-05-09

申请人： Schweitzer Engineering Laboratories, Inc.

发明人： Shankar V. Achanta

IPC分类号： G01R31/08 ,  H02H3/08 ,  H02H3/52 ,  H02H7/26 ,  H02H3/033

摘要： A conductor-mounted device (CMD) used to signal an intelligent electronic device (IED) of the existence of a fault on a portion of the electric power delivery system is described herein. The CMD may provide a heartbeat signal to the IED. The CMD may provide a fault signal to the IED. The CMD may be powered via a parasitic current draw on the conductor to which it is mounted. An IED may use a fault signal and/or LOC signal from a CMD to coordinate a high-impedance fault detection and/or downed line events.

公开(公告)号：US10530144B2

公开(公告)日：2020-01-07

申请号：US16364408

申请日：2019-03-26

申请人： Mohd Hasan Ali

发明人： Mohd Hasan Ali

IPC分类号： H02H9/08 ,  H02H3/16 ,  H01F27/34 ,  H02H3/52 ,  H02H5/00 ,  H02H1/04 ,  H02H1/00 ,  H02H7/04 ,  H02H9/00

摘要： An apparatus for mitigating GIC (geomagnetically induced current) effects through a fuzzy logic controlled variable resistor. Under GIC conditions (or any unbalanced fault current condition), the GIC or unbalanced fault current flows through the neutral of a power transformer. It is detected by the fuzzy logic controller, which sends a signal to a switch to open. The resistor is in the circuit and impedes the flow of current through the neutral, thereby protecting the transformer from getting overheated.

公开(公告)号：US09664723B2

公开(公告)日：2017-05-30

申请号：US14605207

申请日：2015-01-26

申请人： Hamilton Sundstrand Corporation

发明人： Michael Krenz ,  Carl A. Wagner

IPC分类号： G01R31/02 ,  H02H1/00 ,  G01R17/02 ,  G01R23/02 ,  H02H3/28 ,  H02H3/52

CPC分类号： G01R31/025 ,  G01R17/02 ,  G01R23/02 ,  G01R31/02 ,  H02H1/0015 ,  H02H3/28 ,  H02H3/52

摘要： An arc fault detection system includes a first current sensor, a second current sensor, a band-pass filter, and a comparator module. The first current sensor, the second current sensor, and the comparator module are each connected to the comparator module by direct leads for biasing a current differential between the first current sensor and the second current sensor using a bias calculated from a frequency component indicative of arc events received from the frequency selector.

公开(公告)号：US09568535B2

公开(公告)日：2017-02-14

申请号：US14354936

申请日：2012-10-31

申请人： ABB RESEARCH LTD

发明人： Roy Ball

IPC分类号： G01R31/02 ,  H02H3/52 ,  H02H7/04 ,  H02H3/04 ,  G01R15/18

CPC分类号： G01R31/027 ,  G01R15/18 ,  G01R31/026 ,  H02H3/044 ,  H02H3/52 ,  H02H7/042

摘要： A method for detecting an open current transformer in an electrical power system includes measuring for a voltage value on a secondary side of a current transformer. The method continues with observing the voltage value for a predetermined waveform and initiating corrective action in the electrical power system upon detection of the predetermined waveform.

摘要翻译： 一种用于检测电力系统中的开路电流互感器的方法包括测量电流互感器的次级侧上的电压值。 该方法继续观察预定波形的电压值，并且在检测到预定波形时启动电力系统中的校正动作。

公开(公告)号：US08878396B2

公开(公告)日：2014-11-04

申请号：US13159374

申请日：2011-06-13

申请人： Frederick R. Faxvog ,  Wallace Jensen ,  Gale Nordling ,  Greg Fuchs ,  David Blake Jackson ,  Terry Lee Volkmann ,  James Nicholas Ruehl ,  Brian Groh

发明人： Frederick R. Faxvog ,  Wallace Jensen ,  Gale Nordling ,  Greg Fuchs ,  David Blake Jackson ,  Terry Lee Volkmann ,  James Nicholas Ruehl ,  Brian Groh

IPC分类号： H01H47/00 ,  H02H3/52 ,  H02H7/04 ,  H02H1/04 ,  H02H5/00

CPC分类号： H02H3/52 ,  H02H1/04 ,  H02H5/005 ,  H02H7/04 ,  Y10T307/625 ,  Y10T307/707 ,  Y10T307/735 ,  Y10T307/832

摘要： A continuous grounding system for use in an alternating current system including a transformer is disclosed. The system includes a switch assembly connected between a transformer neutral of a transformer and a ground, the switch assembly having an open position and a closed position, the open position disrupting the path through the switch assembly between the electrical connection and the transformer neutral, and the closed position establishing a path connecting the electrical connection to the transformer neutral through the switch assembly, wherein in normal operation of the alternating current electrical device the switch assembly remains in a closed position. The system also includes a DC blocking component positioned in parallel with the switch assembly and connected between the transformer neutral and the ground. The system further includes a control circuit configured to control the switch assembly, the control circuit including a sensor configured to actuate the switch assembly to an open position upon detection of a predetermined harmonic signal threshold at one of the transformer phases or a predetermined threshold of DC current between the transformer neutral and ground.

摘要翻译： 公开了一种用于包括变压器的交流系统的连续接地系统。 该系统包括连接在变压器的变压器空档与接地之间的开关组件，开关组件具有打开位置和闭合位置，打开位置中断通过开关组件在电连接和变压器空档之间的路径，以及 所述关闭位置建立通过所述开关组件将所述电连接件连接到所述变压器中性点的路径，其中在所述交流电气装置的正常操作中，所述开关组件保持在关闭位置。 该系统还包括与开关组件并联设置并连接在变压器中性线和地之间的直流阻塞部件。 所述系统还包括配置成控制开关组件的控制电路，所述控制电路包括传感器，所述传感器被配置为在检测到所述变压器相之一处的预定谐波信号阈值或DC的预定阈值时将所述开关组件致动到打开位置 变压器中性点和地之间的电流。

公开(公告)号：US5691869A

公开(公告)日：1997-11-25

申请号：US471132

申请日：1995-06-06

申请人： Joseph C. Engel ,  Raymond W. MacKenzie

发明人： Joseph C. Engel ,  Raymond W. MacKenzie

IPC分类号： G01R19/165 ,  H02H1/00 ,  H02H1/04 ,  H02H3/16 ,  H02H3/33 ,  H02H3/52 ,  H02H3/00

CPC分类号： H02H1/0015 ,  H02H1/043 ,  H02H3/33

摘要： A low cost analog arcing detector and a circuit breaker incorporating such a detector provide a variable response time to arcing faults based upon the amplitude of the arcing current. A filter generates pulses having an amplitude proportional to the amplitude of the step increase in current generated by the striking of the arc. The pulses are rectified and the amount by which the single polarity pulses exceed a threshold value, selected to eliminate nuisance trips on current step increases characteristic of some common loads, is integrated by a capacitor connected to a resistor which continually adjusts the capacitor voltage in a sense opposite to that of the pulses. The capacitor and resistor are selected to generate a trip signal as a function of the accumulated, time attenuated magnitude of the step increases in current associated with each striking of the arc current. Preferably, the pulses are squared before the reference current is subtracted to provide faster response for large amplitude arc currents, while avoiding false trips caused by known loads. Preferably, the arcing detector is used with a ground current detector which provides further protection by tripping on ground currents flowing through carbon tracks deposited by arcing currents below the threshold of the arcing fault detector.

摘要翻译： 低成本的模拟电弧检测器和结合这种检测器的断路器基于电弧电流的幅度提供对电弧故障的可变响应时间。 滤波器产生具有与通过触发电弧产生的电流的阶梯增加幅度成比例的幅度的脉冲。 脉冲被整流，并且单极性脉冲超过阈值的量被选择以消除电流阶跃上的麻烦跳闸增加一些常见负载的特性，通过连接到电阻器的电容器来集成，电阻器连续地调节电容器电压 感觉与脉冲相反。 选择电容器和电阻器来产生跳闸信号，作为与每次触发电弧电流相关联的电流的步长增加的累积时间衰减幅度的函数。 优选地，在减去参考电流之前对脉冲进行平方，以便对大幅度电弧电流提供更快的响应，同时避免由已知负载引起的错误跳闸。 优选地，电弧检测器与接地电流检测器一起使用，该接地电流检测器通过跳过在流过电弧电流故障检测器的阈值的电弧电流沉积的碳轨迹的接地电流来提供进一步的保护。

公开(公告)号：US5475314A

公开(公告)日：1995-12-12

申请号：US433540

申请日：1995-05-02

申请人： Naoki Kunihiro ,  Tadashi Naito

发明人： Naoki Kunihiro ,  Tadashi Naito

IPC分类号： G01R31/00 ,  G01R31/02 ,  H02H3/52 ,  H02J3/01 ,  G01R23/167

CPC分类号： H02J3/01 ,  G01R31/02 ,  Y02E40/40 ,  Y02P80/112

摘要： A method for improving accuracy of estimating natural frequency of a distribution system. The estimation is performed in order to identify a rectifier load that generates harmonics due to commutation oscillation. It includes the steps of measuring a charging current flowing into a power factor improving capacitor to obtain first data, removing fundamental frequency from the first data to obtain second data, determining, from the second data, a first time at which the amplitude of commutating oscillation components takes a maximum value, picking up third data in the interval beginning from the first time and ending at a second time later than the first time by T/N, where T is the period of the fundamental frequency, and N is the number of rectifier phases, performing frequency analysis on the third data to form fourth data by expanding the third data into a Fourier series, and determining a local peak frequency, that is, the natural frequency in the fourth data. This prevents frequency components of particular orders from being emphasized, and reduces interference between the commutation oscillations, thereby making it possible to obtain a local peak value, that is, the natural frequency with ease at high accuracy.

摘要翻译： 一种提高分配系统固有频率估计精度的方法。 执行该估计以便识别由于换向振荡而产生谐波的整流器负载。 它包括测量流入功率因数改善电容器的充电电流以获得第一数据，从第一数据中去除基频以获得第二数据的步骤，从第二数据确定换向振荡幅度的第一时间 组件获取最大值，从第一次开始的间隔中拾取第三个数据，并且比第一次晚一个时间结束T / N，其中T是基本频率的周期，N是 对第三数据执行频率分析，通过将第三数据扩展为傅立叶级数来形成第四数据，以及确定本地峰值频率，即第四数据中的固有频率。 这防止强调特定次序的频率分量，并且减小换向振荡之间的干扰，从而可以以高精度容易地获得局部峰值，即固有频率。

公开(公告)号：US4297738A

公开(公告)日：1981-10-27

申请号：US89202

申请日：1979-10-29

申请人： Ilyoul Lee

发明人： Ilyoul Lee

IPC分类号： H02H3/52 ,  H02H3/16

CPC分类号： H02H3/52

摘要： A technique for detecting high impedance faults on distribution circuits with delta connected loads is disclosed herein. This technique bases its detection on the status of the third harmonic component in each of the three-phase line currents of the distribution circuit and specifically on a predetermined minimum increase in the amplitude of any one of these components over a continuous predetermined period, whereby to discriminate between a true high impedance fault and a transient disturbance.

摘要翻译： 本文公开了一种用于检测具有三角形连接负载的配电电路上的高阻抗故障的技术。 该技术基于其在分配电路的三相线路电流中的三次谐波分量的状态的检测，并且具体地基于在连续的预定周期内这些组件中的任一个的幅度的预定的最小增加，由此， 区分真正的高阻抗故障和瞬态干扰。