公开(公告)号：US20240272225A1

公开(公告)日：2024-08-15

申请号：US18582205

申请日：2024-02-20

申请人： Hubbell Incorporated

发明人： Gary Michael MILLER ,  William Vernon MILLER, III ,  Edward Shi CHEN

IPC分类号： G01R31/327 ,  G01R35/00 ,  H02H1/00 ,  H02H3/16 ,  H02H3/28 ,  H02H3/33

CPC分类号： G01R31/3277 ,  G01R35/00 ,  H02H1/0015 ,  H02H3/16 ,  H02H3/28 ,  H02H3/331 ,  H02H3/335

摘要： Passive monitoring the integrity of current sensing devices and associated circuitry in GFCI and AFCI protective devices is provided. A protection circuit interrupter employs a capacitively coupled noise signal obtained by an arrangement of one or both of line side arms relative to a Rogowski coil. The noise signal is monitored while the line and load sides of a protective circuit interrupter are disconnected, and the connection of the line and load sides disabled if the noise signal fails to correlate sufficiently to a reference noise cycle. When the line and load sides are connected, the RMS value of the observed current signal is monitored such that the line and load sides are disconnected if the observed current signal fails to meet an RMS threshold. The observed current signal is compensated by subtracting the reference noise cycle prior to monitoring for the fault condition applicable to the protective device.

公开(公告)号：US20180191150A1

公开(公告)日：2018-07-05

申请号：US15393440

申请日：2016-12-29

申请人： Ze Chen

发明人： Ze CHEN ,  Boon Lum Lim ,  Samuel Raj

IPC分类号： H02H3/17 ,  H02H3/07 ,  H02H1/00

CPC分类号： H02H3/17 ,  H02H1/0007 ,  H02H1/0069 ,  H02H3/04 ,  H02H3/07 ,  H02H3/331 ,  H02H3/334

摘要： In one example, a ground fault circuit interrupter is provided. It may include a current imbalance detection circuit configured to provide a leakage signal and a main processing circuit including a processor. The leakage signal may correspond to a current imbalance between a supply path and a return path. The processor may be configured to receive the leakage signal, analyze a time pattern of the leakage signal, determine whether a ground fault exists based on analysis of the time pattern, and generate a first trigger signal if the ground fault is determined to exist. The ground fault circuit interrupter may further include a back-EMF detection circuit configured to provide a back-EMF detection signal. Methods for detecting and responding to a ground fault are also provided.

公开(公告)号：US20180166874A1

公开(公告)日：2018-06-14

申请号：US15372740

申请日：2016-12-08

申请人： SCHNEIDER ELECTRIC USA, INC.

发明人： Joseph R. Beierschmitt

IPC分类号： H02H3/33 ,  H02H1/00

CPC分类号： H02H3/331 ,  H02H1/0015 ,  H02H1/0046 ,  H02H3/334

摘要： A single current transformer arc fault/ground fault sensing circuit utilizes a sense coil and an injection coil from the line conductor placed concentrically and overlapping on a common core. The injection coil is operated by an in-line switch to allow current flow into the injection winding to influence the sense coil. With both the line and return conductors of a single phase circuit being surrounded by the transformer, opening the switch allows a ground fault sampling period, while closing the switch allows an arc fault sampling period.

公开(公告)号：US20100309592A1

公开(公告)日：2010-12-09

申请号：US12792191

申请日：2010-06-02

申请人： Hugh T. Kinsel

发明人： Hugh T. Kinsel

IPC分类号： H02H9/08

CPC分类号： H02H3/331

摘要： In a first aspect, a ground fault circuit interrupt (“GFCI”) device is provided for use with an AC power system that includes a line conductor, a neutral conductor and a transformer. The line conductor and the neutral conductor are each coupled between a source and a load, and the neutral conductor is coupled to ground at the source. The transformer includes a first primary winding coupled in series with the line conductor, a second primary winding coupled in series with the neutral conductor, and a secondary winding. The device includes a grounded neutral fault detector circuit coupled to the secondary winding. The grounded neutral fault detector circuit: (a) drives the secondary winding with a multi-frequency AC signal, (b) monitors a multi-frequency load signal in the secondary winding, and (c) provides a first detection signal if the monitored load signal exceeds a predetermined threshold. Numerous other aspects are also provided.

摘要翻译： 在第一方面，提供接地故障电路中断（“GFCI”）装置，用于与包括线路导体，中性线路和变压器的交流电力系统一起使用。 线路导体和中性线路各自耦合在源极和负载之间，并且中性导体在源极处耦合到地面。 变压器包括与线路导体串联耦合的第一初级绕组，与中性导体串联耦合的第二初级绕组和次级绕组。 该装置包括耦合到次级绕组的接地中性故障检测器电路。 接地中性故障检测器电路：（a）用多频AC信号驱动次级绕组，（b）监测次级绕组中的多频负载信号;（c）如果监视负载 信号超过预定阈值。 还提供了许多其他方面。

公开(公告)号：US07136266B2

公开(公告)日：2006-11-14

申请号：US10664851

申请日：2003-09-22

申请人： Bernard J. Gershen ,  Steve Campolo ,  James Richter ,  Lester Rivera ,  David Herzfeld ,  Roger M. Bradley

发明人： Bernard J. Gershen ,  Steve Campolo ,  James Richter ,  Lester Rivera ,  David Herzfeld ,  Roger M. Bradley

IPC分类号： H02H3/00

CPC分类号： H02H3/331 ,  H02H3/16

摘要： In the present invention the basic detection and interruption components of an Immersion Detection Circuit Interrupter (IDCI), in combination with the line, neutral and shield conductors of an extension or appliance cord provides a new improved type of detector, a Leakage Current Detector Interrupter (LCDI) which interrupts current to a load when current leakage is detected between the line or neutral conductors of the cord and the shield conductor. The new improved LCDI detector provides, either singularly or in combination, the following advantages: Prevents the LCDI from being reset should the device become inoperative (reset lockout); Provides an indication of the integrity of the shield in the extension or appliance cord; Tests the integrity of the shield within the extension or appliance cord, in addition to testing the functionality of the LCDI; Interrupts current to the load if an electrical connection is detected between the shield and neutral, or the shield and ground, in addition to the existing detection of leakage current from the phase conductor; Allows the LCDI to trip during an open neutral condition by utilizing the ground connection as a return wire for the trip coil; and/or Provides immersion detection at the receptacle end of the extension cord in addition to protection from leakage faults.

摘要翻译： 在本发明中，浸入式检测电路断路器（IDCI）的基本检测和中断部件与延长线或器具线的线，中性线和屏蔽导体组合提供了一种新的改进型的检测器，漏电流检测器断路器 LCDI），其在电缆的线或中性导体与屏蔽导体之间检测到电流泄漏时中断到负载的电流。 新的改进的LCDI检测器单独或组合提供以下优点：如果设备不工作（复位锁定），则防止LCDI复位; 提供扩展或电源线中屏蔽层完整性的指示; 除了测试LCDI的功能外，还可以测试扩展或电源线中屏蔽层的完整性; 除了检测到来自相导体的漏电流之外，如果在屏蔽和中性线或屏蔽和接地之间检测到电气连接，中断电流到负载; 通过使用接地连接作为跳闸线圈的返回线，允许LCDI在打开的中性点状态下跳闸; 和/或在延长线的插座端提供浸没检测，以及防止泄漏故障。

公开(公告)号：US06873158B2

公开(公告)日：2005-03-29

申请号：US10668654

申请日：2003-09-23

申请人： Bruce F. Macbeth

发明人： Bruce F. Macbeth

IPC分类号： H01H83/04 ,  H02H3/33 ,  G01R31/14 ,  G01R31/02 ,  G01R31/08 ,  H02H3/16

CPC分类号： H02H3/335 ,  H02H3/331

摘要： A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next half cycle of different phase. Possible responses to the self check failure include lighting an indicator lamp and locking out the device reset mechanism.

摘要翻译： 连接在交流电源的两条线路之间的电路保护装置在跳闸SCR不能进行的时段期间每半周期检查引入的模拟接地故障。 如果自检失败，则设备在不同阶段的下半个周期跳闸。 对自检失败的可能响应包括点亮指示灯并锁定设备复位机构。

公开(公告)号：US20040070895A1

公开(公告)日：2004-04-15

申请号：US10267424

申请日：2002-10-09

发明人： Bernard J. Gershen ,  Steve Campolo ,  James Richter ,  Lester Rivera ,  David Herzfeld ,  Roger M. Bradley

IPC分类号： H02H003/00

CPC分类号： H02H3/331

摘要： With prior art Immersion Detection Circuit Interrupters (IDCI), the firing of the trip coil to open the contacts which interrupts the flow of current to a load uses the neutral conductor as the return path when leakage is detected. If, however, the neutral conductor should become open, there is no return path present to fire the coil. An unsafe condition because the voltage that is present cannot be disconnected from the load. With this invention the SCR, which is used to fire the coil, now uses the ground conductor and diodes as the return path to fire the coil to interrupt the voltage from the load. A fully shielded cord is used to detect a break in a conductor. An LED indicator in either the plug or the receptacle of the extension cord verifies that protection is available. A test button is provided to test shield continuity and to verify proper circuit operation.

摘要翻译： 使用现有技术的浸没检测电路中断器（IDCI），当检测到泄漏时，跳闸线圈的点火打开触点，其中断了向负载的电流的流动，使用中性导体作为返回路径。 然而，如果中性导体应该打开，则没有返回路径来触发线圈。 不安全的状况，因为存在的电压不能与负载断开连接。 利用本发明，用于激发线圈的SCR现在使用接地导体和二极管作为返回路径来对线圈起火以中断来自负载的电压。 全屏蔽线用于检测导体中断。 延长线的插头或插座中的LED指示灯验证是否有保护。 提供一个测试按钮来测试屏蔽连续性并验证电路的正常工作。

公开(公告)号：US06674289B2

公开(公告)日：2004-01-06

申请号：US09725525

申请日：2000-11-29

申请人： Bruce F. Macbeth

发明人： Bruce F. Macbeth

IPC分类号： G01R3114

CPC分类号： H02H3/335 ,  H02H3/331

摘要： A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next half cycle of different phase. Possible responses to the self check failure include lighting an indicator lamp and locking out the device reset mechanism.

公开(公告)号：US20030156367A1

公开(公告)日：2003-08-21

申请号：US10354661

申请日：2003-01-30

发明人： Bruce F. Macbeth

IPC分类号： H02H007/04

CPC分类号： H02H1/0015 ,  H02H1/003 ,  H02H3/331 ,  H02H3/334 ,  H02H5/105

摘要： An electrical protection device which protects an electrical power distribution system supplying voltage from a secondary winding of a transformer through an electrically conductive path to the protection device includes an impedance detector which measures the impedance of the path. When the impedance of the path exceeds a pre-determined threshold, the protection device produces a signal which is used to indicate a problem or interrupt the circuit. In a system approach, an overcurrent protection device is installed at an origin of a branch circuit for interrupting current when an overcurrent condition is present, while a fault protection device is installed at an outlet in the branch circuit. The fault protection device includes circuitry for measuring an impedance in the branch circuit and circuitry for producing a signal when the measured impedance exceeds a predetermined value. Such a system affords series fault and parallel arc fault protection to the branch circuit.

摘要翻译： 保护通过导电路径向变压器的次级绕组提供电压的配电系统的电气保护装置包括测量路径阻抗的阻抗检测器。 当路径的阻抗超过预定阈值时，保护装置产生用于指示问题或中断电路的信号。 在系统方法中，过电流保护装置安装在用于在存在过电流状况时中断电流的分支电路的原点，而故障保护装置安装在分支电路的出口处。 故障保护装置包括用于测量分支电路中的阻抗的电路和用于当所测量的阻抗超过预定值时产生信号的电路。 这种系统为分支电路提供串联故障和并联电弧故障保护。

公开(公告)号：US5224006A

公开(公告)日：1993-06-29

申请号：US765759

申请日：1991-09-26

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

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

IPC分类号： H01H71/28 ,  H02H1/00 ,  H02H1/04 ,  H02H1/06 ,  H02H3/093 ,  H02H3/33 ,  H02H3/44

CPC分类号： H02H1/0015 ,  H02H3/33 ,  H01H71/28 ,  H02H1/043 ,  H02H1/063 ,  H02H3/093 ,  H02H3/331 ,  H02H3/335 ,  H02H3/44

摘要： A circuit breaker bandwidth limits a sensed rate of change of current, di/dt, in the neutral conductor of a protected electrical system and fullwave rectifies the bandwidth limited di/dt signal for comparison with an instantaneous trip reference signal. The bandwidth is selected to provide a selected relative sensitivity of the instantaneous trip to sinusoidal currents associated with overcurrent faults and step currents associated with sputtering arc faults. The rectified bandwidth limited di/dt signal is also filtered and delayed for comparison with a delayed trip reference signal. The time constant for the filter is selected to provide a selected relative sensitivity of the delayed trip to overcurrent faults and sputtering arc faults. A low mu sensing coil used to generate the di/dt signal can also serve as the neutral current sensing coil of a dormant oscillator ground fault protection system.

摘要翻译： 断路器带宽限制了受保护电气系统的中性导体中感测到的电流变化率di / dt，并对带宽限制的di / dt信号进行全波整流，以便与瞬时跳闸参考信号进行比较。 选择带宽以提供与过电流故障和与溅射电弧故障相关的步进电流相关联的正弦电流的所选择的相对灵敏度。 整流带宽限制di / dt信号也被滤波和延迟以与延迟跳闸参考信号进行比较。 选择滤波器的时间常数，以提供延迟跳闸对过电流故障和溅射电弧故障的选定相对灵敏度。 用于产生di / dt信号的低μ感测线圈也可以用作休眠振荡器接地故障保护系统的中性电流感测线圈。