公开(公告)号：US11329589B2

公开(公告)日：2022-05-10

申请号：US13842707

申请日：2013-03-15

Applicant: Joy Global Underground Mining LLC

Inventor： Peter M. Dalton ,  Michael Jordan

IPC: H02P27/04 ,  H02H3/17 ,  H02H3/16

Abstract: A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.

公开(公告)号：US10951019B2

公开(公告)日：2021-03-16

申请号：US15969268

申请日：2018-05-02

Applicant: AIRBUS OPERATIONS (SAS)

Inventor： Franck Flourens ,  Christian Donadille ,  Patrick Oms

IPC: H02H3/00 ,  H02H3/20 ,  H02H9/02 ,  H02H1/00 ,  H03K5/24 ,  H02H5/10 ,  H02H3/17 ,  G01R31/00 ,  G01R31/50

Abstract: An electrical link (290) configured to link a DC high-voltage power source (270) to a user apparatus (250), and includes an electrical conductor (240) surrounded by an insulating cover and an electrical protection device (200) including: a conductive sleeve (280) arranged around the insulating cover, a biasing module (245) configured to voltage-bias the conductive sleeve (280), a circuit breaker (210) arranged on the conductor (240) and configured to cut off a current transiting through the conductor (240), and a detection module (220) connected to the conductive sleeve (280) and configured to detect a current leak out of the conductor (240) and to command the circuit breaker (210) on the basis of the detection. The invention also relates to a method for the secure supply of electric power.

公开(公告)号：US09929558B2

公开(公告)日：2018-03-27

申请号：US14940866

申请日：2015-11-13

Applicant: Bender GmbH & Co. KG

Inventor： Dieter Hackl

IPC: H02H3/00 ,  H02H3/34 ,  H02H3/17 ,  G01R31/08 ,  H02H1/00 ,  H02H7/28

CPC classification number: H02H3/34 ,  G01R31/086 ,  H02H1/003 ,  H02H3/17 ,  H02H7/28 ,  Y04S10/522

Abstract: An electrical protective device (20) and method are for selective disconnection of a subsystem (6a, 6b) in the event of a second fault in an ungrounded power supply system (2) with a main system (4) and at least one subsystem (6a, 6b), the subsystem (6a, 6b) having a differential current measuring device (12a, 12b) and a switching device (14a, 14b) for separating the subsystem (6a, 6b). The invention is based on generating and applying a measuring signal voltage (Um) between one or more phase(s) of the main system (4) or from a neutral point of the main system (4) against ground (9) using a resonant coupling circuit (22) that has a measuring signal generator (24) and a series resonant circuit (26) connected in series to the measuring signal generator (24), a resonant frequency (f0AK) of the series resonant circuit (26) being set to correspond to the measuring signal frequency.

公开(公告)号：US09579978B2

公开(公告)日：2017-02-28

申请号：US14381298

申请日：2013-02-21

Applicant: PANASONIC CORPORATION

Inventor： Tsuyoshi Nishio ,  Osamu Ohashi ,  Noriaki Asaoka ,  Akihiro Morimoto

IPC: B60L3/04 ,  B60L3/00 ,  H02H3/16 ,  B60L11/18 ,  G01R31/00 ,  G01R31/02 ,  H02J7/00 ,  H02H3/17

CPC classification number: B60L3/04 ,  B60L3/00 ,  B60L3/0069 ,  B60L11/1809 ,  B60L2210/30 ,  G01R31/006 ,  G01R31/025 ,  H02H3/16 ,  H02H3/17 ,  H02J7/0031 ,  Y02T10/7005 ,  Y02T10/7072 ,  Y02T10/7241 ,  Y02T90/127 ,  Y02T90/14

Abstract: The present invention is an in-vehicle charger for detecting ground faults originating in sections in which alternating current is flowing. This device is an in-vehicle charger (100) for charging a vehicle-mounted battery, wherein the device is provided with: a bridge rectifier (14) for converting alternating current supplied from a power source to direct current; a ground fault detecting circuit (21) for outputting a test voltage when a test current flows in a circuit in the in-vehicle charger (100) and, based on changes in the test current in response to the presence or absence of a ground fault resistor, for detecting a ground fault in the circuit of the in-vehicle charger (100); and a controller (23) for controlling the ground fault sensing circuit (21) so as to output a test voltage exceeding the forward voltage of a diode provided by the bridge rectifier (14).

Abstract translation: 本发明是用于检测源自交流电流流动的部分的接地故障的车载充电器。 该装置是车载充电器（100），用于对车载电池充电，其中该装置设置有：桥式整流器（14），用于将从电源提供的交流电转换成直流电; 接地故障检测电路（21），用于当测试电流在车载充电器（100）中的电路中流动时输出测试电压，并且基于响应于是否存在接地故障的测试电流的变化 电阻器，用于检测车载充电器（100）的电路中的接地故障; 以及用于控制所述接地故障检测电路（21）以输出超过由所述桥式整流器（14）提供的二极管的正向电压的测试电压的控制器（23）。

公开(公告)号：US5764462A

公开(公告)日：1998-06-09

申请号：US839975

申请日：1997-04-24

Applicant: Toshio Tanaka ,  Yoshinori Takei ,  Tetsuo Ugawa

Inventor： Toshio Tanaka ,  Yoshinori Takei ,  Tetsuo Ugawa

IPC: H02H7/06 ,  G01R31/06 ,  H02H3/17 ,  H02P9/30 ,  H02H3/00

CPC classification number: H02H7/065 ,  G01R31/346 ,  G01R31/025

Abstract: According to a field ground fault detector, a predetermined resistor is connected in series to a predetermined DC voltage. A DC voltage is applied between an N electrode side field circuit of a generator and a ground through the resistor. A voltage applied between terminals of the resistor is input to a low-pass filter. A voltage applied between the N electrode side field circuit and the ground is input to another low-pass filter. Output voltages of the low-pass filters are input to a level ratio determining circuit. The level ratio determining circuit outputs the determined result of the ground fault to the outside of the field ground fault detector corresponding to these voltages. Thus, even if the DC voltage varies or a higher harmonic voltage takes place in a generator of a thyristor exciting type, it does not affect the detecting sensitivity of the ground fault.

Abstract translation: 根据现场接地故障检测器，预定电阻器与预定的直流电压串联连接。 通过电阻器在发电机的N电极侧场电路和地之间施加直流电压。 施加在电阻器的端子之间的电压被输入到低通滤波器。 施加在N电极侧场电路和地之间的电压被输入到另一低通滤波器。 低通滤波器的输出电压被输入到电平比确定电路。 电平比确定电路将确定的接地故障结果输出到与这些电压对应的现场接地故障检测器的外部。 因此，即使在晶闸管励磁型发电机中发生直流电压变化或谐波电压较高，也不影响接地故障的检测灵敏度。

公开(公告)号：US5548466A

公开(公告)日：1996-08-20

申请号：US336115

申请日：1994-11-04

Applicant: Marcus A. Smith

Inventor： Marcus A. Smith

IPC: H02H3/05 ,  H02H3/17 ,  H02H5/10 ,  H02H3/16

CPC classification number: H02H3/05 ,  H02H3/17 ,  H02H5/105

Abstract: The present invention is directed to a system for sensing fault current flowing through a person who touches an exposed conductor in a cable connecting a machine to a power distribution center wherein the power distribution center has a number of power cables for connecting a number of machines thereto. Each power cable has a different frequency impressed thereon by an oscillator which frequency is transmitted through an electrical path including the power center if the operator touches the fault. A sensing circuit for each cable is connected in the electrical path and tuned to only the frequency applied to that cable. When the sensing circuit detects that frequency, the sensing circuit interrupts power to the cable. If, for some reason, the sensing circuit fails to interrupt power to the cable, within a selected time interval of less than one-half second, a backup system interrupts power to the entire power center. In order to detect ground faults, the ground conductor in each cable is grounded to the power center's frame through a zener diode bank which is in parallel with a high pass capacitor connected thereto by a preventive resistor. The zener diode bank also suppresses intermachine arcing should two machines touch or come into close proximity. In addition to ground faults, broken ground wires are detected by connecting each ground wire through a preventive resistor to a signal monitor. If a ground wire breaks, the signal monitor for that cable alerts the sensing circuit for that cable, and the sensing circuit interrupts power to the cable.

Abstract translation: 本发明涉及一种用于感测流过穿过连接机器到配电中心的电缆中的裸露导体的人的故障电流的系统，其中配电中心具有用于连接多个机器的多个电力电缆 。 每个电力电缆具有通过振荡器在其上施加的不同频率，如果操作者接触故障，该频率通过包括功率中心的电气路径传输。 每个电缆的感测电路连接在电气路径中，并仅调谐到施加到该电缆的频率。 当感测电路检测到该频率时，感测电路中断电缆的电源。 如果由于某种原因感测电路不能中断电缆的电源，则在小于1/2秒的选定时间间隔内，备用系统会中断整个电源中心的电源。 为了检测接地故障，每条电缆中的接地线通过齐纳二极管组接地到电力中心的框架，该二极管组与通过预防电阻连接的高通电容并联。 如果两台机器接触或接近，则齐纳二极管组还抑制机间电弧。 除了接地故障之外，通过将每个接地线通过预防电阻连接到信号监视器来检测到接地线是否断裂。 如果接地线断线，该电缆的信号监控器会向该电缆的感测电路报警，并且感测电路中断电缆的电源。

公开(公告)号：US5376869A

公开(公告)日：1994-12-27

申请号：US16551

申请日：1993-02-11

Applicant: Charles E. Konrad

Inventor： Charles E. Konrad

IPC: B60L3/00 ,  B60L15/20 ,  B60W30/18 ,  H02P3/10 ,  H02H3/17

CPC classification number: B60L15/2018 ,  B60L11/14 ,  B60L11/1877 ,  B60L15/2009 ,  B60L2240/12 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/486 ,  B60L2250/26 ,  B60W30/18118 ,  Y02T10/645 ,  Y02T10/70 ,  Y02T10/7005 ,  Y02T10/705 ,  Y02T10/7077 ,  Y02T10/7275

Abstract: An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared.

Abstract translation: 一种电动车辆传动系包括一个用于检测和补偿车辆回退的控制器，就像当车辆在倾斜处向上起动时。 该车辆包括可以相应于车辆运动相反方向的相反方向旋转的电动马达。 齿轮选择器允许驾驶员选择预期或期望的车辆运动方向。 如果与电动机相关联的速度和旋转传感器指示车辆运动与车辆运动的预期方向相反，则马达被驱动到转矩输出幅度作为回滚速度的非常数函数以抵消车辆回滚。 扭矩功能可以是速度的线性函数或速度平方函数。

公开(公告)号：US4837519A

公开(公告)日：1989-06-06

申请号：US129160

申请日：1987-12-07

Applicant: Juan P. Lopetrone ,  Oliver Valdes ,  James Clopton, Jr.

Inventor： Juan P. Lopetrone ,  Oliver Valdes ,  James Clopton, Jr.

IPC: G01R31/08 ,  G01R27/18 ,  G01R31/02 ,  H02H3/16 ,  H02H3/17

CPC classification number: G01R31/025 ,  G01R27/18 ,  H02H3/16 ,  H02H3/17

Abstract: Apparatus for the detection of leakage current in a system includes a power supply and conductors from the supply for supplying power to a load connected to the system. There is an interrupter connected in the system and to a ground point such that a ground leakage current in the system has a closed circuit. Activation of the interrupter about every 12 seconds effectively generates a pulse interrupted ground fault signal. Such signal is detected by a magnetic sensor located relative to a multi-feeder system with high capacitive reactance. The sensor is immune to random electromagnetic and electrostatic conditions in the distribution system. The sensor is synchronized to operate with the interrupter so that sensing is effected at a steady level of a square wave interrupted pulse.

Abstract translation: 用于检测系统中的泄漏电流的装置包括电源和来自电源的导体，用于向连接到系统的负载供电。 在系统中连接有断路器和接地点，使得系统中的接地漏电流具有闭合电路。 断续器大约每12秒激活一次有效地产生脉冲中断的接地故障信号。 这种信号由相对于具有高电容性电抗的多馈线系统的磁传感器来检测。 传感器不受分配系统中的随机电磁和静电条件的影响。 传感器被同步以与断续器一起操作，使得在方波中断脉冲的稳定水平上进行感测。

公开(公告)号：US4739274A

公开(公告)日：1988-04-19

申请号：US773333

申请日：1985-09-06

Applicant: Dorr Kimball ,  Michael G. Cox ,  Manuel R. Cabison

Inventor： Dorr Kimball ,  Michael G. Cox ,  Manuel R. Cabison

IPC: G01R31/02 ,  H02H3/17 ,  G01R31/08 ,  G01R33/00

CPC classification number: H02H3/17 ,  G01R31/025

Abstract: Apparatus for the detection of ground leakage in a normally ungrounded DC system includes a DC power supply and conductors from the supply for supplying power to a load connected to the DC system. There is an indicator connected between the DC system and a ground point such that a ground leakage in the system closes a circuit to activate the indicator. With such activation, a pulser periodically interrupts the circuit to effectively generate an interrupted ground fault signal. Such signal is detected by a sensor located relative to the DC system such that an interrupted ground signal detected by the sensor locates the ground fault. Noise introduced into the pulse signal by the periodic interruption of the circuit during the ground fault occurrence is suppressed by the sensor means.

公开(公告)号：US4722021A

公开(公告)日：1988-01-26

申请号：US915919

申请日：1986-10-03

Applicant: Friedrich Hornung ,  Fritz Schadlich ,  Martin Gerschner ,  Klaus Gunther

Inventor： Friedrich Hornung ,  Fritz Schadlich ,  Martin Gerschner ,  Klaus Gunther

IPC: B23B45/00 ,  B23B47/00 ,  B27G21/00 ,  B28D1/14 ,  F16P7/00 ,  H02H3/14 ,  H02H3/17

CPC classification number: B28D1/14 ,  B23B45/00 ,  F16P7/00 ,  H02H3/14 ,  Y10S388/903 ,  Y10S388/909 ,  Y10S388/919 ,  Y10S388/937

Abstract: To detect if a tool bit, such as a drill, a saw blade, or the like, upon being worked into a wall, meets a metallic obstruction, such as a conduit, reinforcement rod, hydraulic pipe or the like, an alternating voltage, preferably between 2 and 20 kHz, is coupled through a coupling capacitor (9) to the tool bit, and current flow to the tool bit is detected by a current measurement stage (10; 31, 32) to disconnect energy to the drive motor (5), for example by disabling firing of a thyristor (15), or closing a valve of a compressed-air tool. The coupling capacitor should have a capacity small enough to provide high impedance to network power frequency, and to insure a substantial change in current being supplied to the tool bit holder, typically a chuck, if the tool bit meets a metallic object in the wall. The a-c supply circuit can be formed as part of a trigger circuit for the thyristor, by pulse-energizing a trigger diode (28) upon repetitive charge of a capacitor (26) through a charging network (22, 23, 24, 25).

Abstract translation: 为了检测工具钻头（例如钻头，锯片等）在被加工成墙壁时是否遇到金属阻塞物，例如导管，加强杆，液压管等，交流电压， 优选地在2和20kHz之间，通过耦合电容器（9）耦合到工具头，并且通过电流测量级（10; 31,32）检测到工具位的电流流动以将能量断开到驱动电动机 5），例如通过禁止烧制可控硅（15）或关闭压缩空气工具的阀。 耦合电容应具有足够小的能力，以提供对网络功率频率的高阻抗，并且如果工具头与壁中的金属物体相遇，则确保将电流提供给工具头座（通常为卡盘）的实质变化。 a-c电源电路可以形成为用于晶闸管的触发电路的一部分，通过在电容器（26）经过充电网络（22,23,24,25）重复充电时，通过脉冲激励触发二极管（28）。