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公开(公告)号：US09664723B2
公开(公告)日：2017-05-30
申请号：US14605207
申请日：2015-01-26
发明人： Michael Krenz , Carl A. Wagner
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.
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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
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。
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3.发明授权公开(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
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。
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4.发明申请SYSTEM AND METHOD FOR HIGH RESISTANCE GROUND FAULT DETECTION AND PROTECTION IN POWER DISTRIBUTION SYSTEMS 有权电力分配系统中高电压接地故障检测与保护的系统与方法公开(公告)号：US20130322133A1
公开(公告)日：2013-12-05
申请号：US13487322
申请日：2012-06-04
申请人： Huaqiang Li
发明人： Huaqiang Li
CPC分类号： G01R31/025 , H02H3/165 , H02H3/52 , H02H7/1227
摘要： A system and method for detecting high resistance ground faults in a power distribution system is disclosed. A fault detection and protection system is provided that includes a plurality of current sensors to measure current on the three phase output of the converter-inverter arrangement of the power distribution system and a controller configured to measure the three phase current on the three phase output, extract a fundamental current component for each phase of the three phase output, extract a third harmonic component for each phase of the three phase output, compare the fundamental current component and the third harmonic component extracted from each phase to a first threshold and a second threshold, respectively, and detect a ground fault on a phase of the three phase output based on the comparisons of the fundamental current component and the third harmonic component to the first and second thresholds.
摘要翻译： 公开了一种用于检测配电系统中的高电阻接地故障的系统和方法。 提供了一种故障检测和保护系统，其包括多个电流传感器，以测量配电系统的转换器 - 逆变器装置的三相输出端上的电流;以及控制器，被配置为测量三相输出上的三相电流， 提取三相输出的每相的基波电流分量，提取三相输出的每相的三次谐波分量，将从每相提取的基波电流分量和三次谐波分量进行比较，将其从第一阈值和第二阈值 并且基于基本电流分量和第三谐波分量与第一和第二阈值的比较来检测三相输出的相位上的接地故障。
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公开(公告)号：US08513951B2
公开(公告)日：2013-08-20
申请号：US12182341
申请日：2008-07-30
IPC分类号： G01R31/00
CPC分类号： H02H3/52 , G01R31/025 , G01R31/088 , H02H1/0015
摘要： A method and apparatus are provided for detecting a fault condition on a power system. By rectifying power system phase voltages to produce a rectified waveform, and filtering the rectified waveform or a representation of the rectified waveform through a finite gain synchronous band pass filter to generate a synchronous band pass filter output waveform that indicates the magnitude of a predefined harmonic frequency component, a fault condition on a power system can be identified.
摘要翻译： 提供一种用于检测电力系统上的故障状况的方法和装置。 通过整流电力系统相电压以产生整流波形，并通过有限增益同步带通滤波器对整流波形或整流波形的表示进行滤波，以产生指示预定谐波频率幅度的同步带通滤波器输出波形 组件，可以识别电力系统上的故障状况。
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6.发明授权Method for sectioning with a section switch a medium-voltage electric power distribution line exhibiting a disturbance, section switch for medium-voltage electric power distribution line applicable thereon and electronic circuit for detecting a fault current and comprised by said section switch 有权用于切换显示干扰的中压配电线路的分段开关和适用于其的中压配电线路的切换开关和用于检测故障电流的电子电路并由所述切换开关公开(公告)号：US08125751B2
公开(公告)日：2012-02-28
申请号：US11659306
申请日：2005-05-11
申请人： Jorge Cavanna , Javier Cavanna
发明人： Jorge Cavanna , Javier Cavanna
IPC分类号： H02H3/08
CPC分类号： H02H1/043 , H01H33/022 , H01H33/027 , H01H33/121 , H01H33/423 , H01H71/123 , H01H71/505 , H02H3/52
摘要： A method for sectioning a medium-voltage distribution electric line evidencing a disturbance using a section switch. The steps are: (a) detecting a current having an amplitude and a wave form profile in the medium-voltage line; (b) analyzing the wave form profile to determine whether the fault is transient, permanent, a transformer input current or transformer in-rush current; (c) and determining the behavior of the section switch from the result of the wave form profile analysis. The section switch is installed on auxiliary branches of a distribution network having a main line that is protected by an automatic reset circuit breaker. The section switch has an opening mechanism having a coil and an electronic circuit. The electronic circuit has a power source for the coil and electronic circuit, a detector to detect current and an analyzer to determine whether the detected current is a transient or a permanent fault.
摘要翻译： 一种使用断面开关对表示扰动的中压配电线进行切断的方法。 步骤是：（a）在中压线中检测具有振幅和波形轮廓的电流; （b）分析波形轮廓以确定故障是瞬态的，永久的，变压器输入电流还是变压器浪涌电流; （c）并根据波形轮廓分析的结果确定截面切换的行为。 分段开关安装在具有由自动复位断路器保护的主线的配电网的辅助分支上。 截面开关具有带有线圈和电子电路的开启机构。 电子电路具有用于线圈和电子电路的电源，用于检测电流的检测器和分析器，以确定检测到的电流是瞬态还是永久故障。
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公开(公告)号：US20120019962A1
公开(公告)日：2012-01-26
申请号：US13185858
申请日：2011-07-19
申请人： Frederick R. Faxvog , Wallace Jensen , Terrance R. Noe , Craig Eid , David Blake Jackson , Greg Fuchs , Gale Nordling
发明人： Frederick R. Faxvog , Wallace Jensen , Terrance R. Noe , Craig Eid , David Blake Jackson , Greg Fuchs , Gale Nordling
CPC分类号： H02H5/005 , H02H3/52 , H02H7/0455
摘要： Systems and method for detecting potentially harmful harmonic and direct current signals at a transformer are disclosed. One such system includes a plurality of detection components electrically connected to electrical signal lines leading from one or more connection points on a power grid, and a plurality of threshold detectors, each threshold detector configured to compare an incoming signal from a detection component to a predetermined signal having a threshold. The system also includes a controller receiving an output from each of the plurality of threshold detectors and configured to drive at least one external component in response to receiving an indication from at least one of the plurality of threshold detectors of a detected signal above a threshold.
摘要翻译： 公开了一种在变压器上检测潜在的有害谐波和直流电信号的系统和方法。 一种这样的系统包括电连接到从电网上的一个或多个连接点引出的电信号线的多个检测组件和多个阈值检测器，每个阈值检测器被配置为将来自检测部件的输入信号与预定的 信号具有阈值。 所述系统还包括控制器，其接收来自所述多个阈值检测器中的每一个的输出，并且被配置为响应于从所述多个阈值检测器中的至少一个检测器接收到高于阈值的检测信号的指示来驱动至少一个外部部件。
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公开(公告)号：US20100026276A1
公开(公告)日：2010-02-04
申请号：US12182341
申请日：2008-07-30
IPC分类号： G01R23/00
CPC分类号： H02H3/52 , G01R31/025 , G01R31/088 , H02H1/0015
摘要： A method and apparatus are provided for detecting a fault condition on a power system. By rectifying power system phase voltages to produce a rectified waveform, and filtering the rectified waveform or a representation of the rectified waveform through a finite gain synchronous band pass filter to generate a synchronous band pass filter output waveform that indicates the magnitude of a predefined harmonic frequency component, a fault condition on a power system can be identified.
摘要翻译： 提供一种用于检测电力系统上的故障状况的方法和装置。 通过整流电力系统相电压以产生整流波形，并通过有限增益同步带通滤波器对整流波形或整流波形的表示进行滤波，以产生指示预定谐波频率幅度的同步带通滤波器输出波形 组件，可以识别电力系统上的故障状况。
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9.发明授权Apparatus for and method of detecting high impedance faults on distribution circuits with delta connected loads 失效用三角形连接负载检测配电电路上的高阻抗故障的装置和方法
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
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。
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10.发明授权Crowbar circuit for voltage cutoff with series and shunt switchable means 失效用于具有串联和分流切换装置的电压切断的电弧电路
公开(公告)号：US3579036A
公开(公告)日：1971-05-18
申请号：US3579036D
申请日：1969-01-24
申请人： NCR CO
发明人： MCCOY MARION B
摘要： A crowbar circuit comprises means sensitive to an overcurrent condition through a load to promptly throw a crowbar across the load, thereby isolating the load from its power supply. To prevent an unreasonable dissipation of power through the crowbar, the same sensing mechanism which throws the crowbar initiates operation of a time delayed mechanism which disconnects the power supply from the crowbar. To further conserve the power supply during the interval following operation of the crowbar and before disconnection of the power supply, the circuit includes energy absorbing means which retards dissipation of power from the power supply.
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