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1.发明授权公开(公告)号：US08159229B2
公开(公告)日：2012-04-17
申请号：US12293601
申请日：2006-10-18
申请人： Magnus Akke , Björn Westman , Henrik Åshuvud
发明人： Magnus Akke , Björn Westman , Henrik Åshuvud
CPC分类号： H02H3/402 , G01R31/088
摘要： A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.
摘要翻译： 一种用于距离保护的相对地环路的负载补偿方法。 假设零故障电阻或正序列电流估计第一反应到达。 以零序电流估计第二反应到达。 用负序电流估计第三个反应到达。 估计进出口条件。 根据第一，第二和第三无效范围估计进出口条件的第四个反应性达到。 基于估计的第四无功覆盖率来估计故障阻抗。
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2.发明申请公开(公告)号：US20100225329A1
公开(公告)日：2010-09-09
申请号：US12293601
申请日：2006-10-18
申请人： Magnus Akke , Björn Westman , Henrik Åshuvud
发明人： Magnus Akke , Björn Westman , Henrik Åshuvud
IPC分类号： G01R31/08
CPC分类号： H02H3/402 , G01R31/088
摘要： A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.
摘要翻译： 一种用于距离保护的相对地环路的负载补偿方法。 假设零故障电阻或正序列电流估计第一反应到达。 以零序电流估计第二反应到达。 用负序电流估计第三个反应到达。 估计进出口条件。 根据第一，第二和第三无效范围估计进出口条件的第四个反应性达到。 基于估计的第四无功覆盖率来估计故障阻抗。
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3.发明申请FAST IMPEDANCE PROTECTION TECHNIQUE IMMUNE TO DYNAMIC ERRORS OF CAPACITIVE VOLTAGE TRANSFORMERS 有权快速阻抗保护技术免受电容式电压互感器的动态误差公开(公告)号：US20080239602A1
公开(公告)日：2008-10-02
申请号：US11694420
申请日：2007-03-30
IPC分类号： H02H3/16
CPC分类号： H02H3/402
摘要： The present invention relates to methods for providing impedance protection differentiating between in-zone and out-of-zone faults based on instantaneous, digitally derived operating and polarizing, distance comparator signals. The method uses a pair of fast orthogonal filters to derive D and Q components of the input voltages and currents. Two sets of operating and polarizing signals are derived for better speed of response under varying fault moment with respect to the peaks and zero crossings of power signals. Three stages of comparison between the operating and polarizing impedance terms are used. These comparator stages use half a cycle averaging windows, and three-quarters-of-a-cycle windows. The first stage of comparison is based on energy comparator responding to both magnitude and phase information in the signals. Stages 2 and 3 are of phase comparison type, responding mostly at the phase information and neglecting the magnitude information for better immunity to noise and signal distortions.
摘要翻译： 本发明涉及提供阻抗保护的方法，其基于瞬时的，数字导出的操作和极化距离比较器信号来区分区域内和区域外故障。 该方法使用一对快速正交滤波器来导出输入电压和电流的D和Q分量。 导出两组操作和极化信号，以在相对于功率信号的峰值和过零点的变化故障时刻获得更好的响应速度。 使用操作和极化阻抗项之间的三个比较阶段。 这些比较器级使用半周期平均窗口和四分之三的四周窗口。 比较的第一阶段是基于能量比较器来响应信号中的幅度和相位信息。 阶段2和3是相位比较类型，主要响应于相位信息，并且忽略幅度信息以更好地抵抗噪声和信号失真。
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4.发明授权Line current differential protective relaying method and relay for in-zone tapped transformers 失效线路电流差动保护继电器和用于区域内螺纹式变压器的继电器公开(公告)号：US06829544B1
公开(公告)日：2004-12-07
申请号：US09546280
申请日：2000-04-10
IPC分类号： H02H300
摘要： A line current differential protective relay and method for protecting transmission lines with power transformers tapped between the substations without any measurements taken at the tap point. The protection method uses distance supervision by an overcharging instantaneous impedance zone to prevent malfunction of the relay during external faults at the distribution busbar of the tapped transformer. The protection method uses modified current differential principle that compares the zero sequence compensated differential and restraining signals to provide relay stability on external ground faults. The protection method combines both the traditional and modified current differential principles to provide phase-selective operation.
摘要翻译： 线路电流差动保护继电器和方法，用于在变电站之间点击电力变压器保护输电线路，而无需在分接点进行任何测量。 保护方法采用过充电瞬时阻抗区域的距离监控，以防止继电器在抽头变压器配电母线的外部故障时发生故障。 该保护方法采用改进的电流差分原理，比较零序补偿差分和约束信号，以提供外部接地故障的继电器稳定性。 该保护方法结合了传统和修改的电流差分原理，以提供相位选择性操作。
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公开(公告)号：US5659242A
公开(公告)日：1997-08-19
申请号：US454018
申请日：1995-05-30
申请人： Fernando Calero
发明人： Fernando Calero
IPC分类号： G06F7/02 , G01R19/00 , G01R19/25 , G01R21/133 , G01R25/00 , G01R31/00 , G01R31/02 , G06F1/02 , H02H3/00 , H02H3/38 , H02H3/40
CPC分类号： G01R19/0038 , G01R19/25 , G01R25/00 , H02H3/382 , H02H3/385 , G01R19/2513 , G01R21/133 , G01R31/02 , H02H3/003 , H02H3/38 , H02H3/402
摘要： A numerical comparator is disclosed. The numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application of this invention, the torque signal generated by the numerical comparator, M.sub.k+1, is employed to determine whether a fault has occurred in a transmission line. Another application involves employing the output M.sub.k+1 to determine the direction of power flow in the transmission line. In yet another application, the output M.sub.k+1 is used to determine whether a voltage or current has exceeded a predetermined threshold.
摘要翻译： 公开了一种数字比较器。 数值比较器采用基于气缸单元的行为的数值技术来实时比较相量。 在本发明的一个应用中，由数字比较器Mk + 1产生的转矩信号用于确定传输线路中是否发生故障。 另一个应用包括采用输出Mk + 1来确定传输线中的功率流的方向。 在另一个应用中，输出Mk + 1用于确定电压或电流是否已经超过预定阈值。
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公开(公告)号：US4405966A
公开(公告)日：1983-09-20
申请号：US309549
申请日：1981-10-07
申请人： Leonardo P. Cavero
发明人： Leonardo P. Cavero
CPC分类号： H02H3/402
摘要： Disclosed is a system that provides protection for a high voltage transmission line. The system employs improved polarizing and operating signals for both a phase selector relay and a distance measuring relay. The improved polarizing and operating signals provide an accurate out-of-phase relationship during the presence of normal conditions existing on a high voltage transmission line and an in-phase relationship during the presence of fault or abnormal conditions existing on the high voltage transmission line. The accurate phase relationships are utilized by phase comparator circuits of each of the phase selector and distance measuring relays to obtain desired operating characteristics for each relay. In another embodiment, the desired operating characteristics of the phase selector and distance measuring relays are obtained by an amplitude comparator circuit. In a still further embodiment, the distance measuring relay is operated under the control of the phase selector relay so as to provide the proper desired phase selection and protection of the high voltage transmission line.
摘要翻译： 公开了一种为高压输电线路提供保护的系统。 该系统为相位选择继电器和距离测量继电器采用改进的极化和操作信号。 改善的极化和操作信号在存在于高电压传输线上存在的正常条件和在高电压传输线上存在的故障或异常状况存在的同相关系期间提供精确的异相关系。 每个相位选择器和距离测量继电器的相位比较器电路利用精确的相位关系，以获得每个继电器的期望的工作特性。 在另一个实施例中，相位选择器和距离测量继电器的期望工作特性由振幅比较器电路获得。 在又一实施例中，距离测量继电器在相位选择器继电器的控制下操作，以便提供对高压输电线路的适当期望的相位选择和保护。
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8.发明申请公开(公告)号：US20120330582A1
公开(公告)日：2012-12-27
申请号：US13499635
申请日：2009-09-30
摘要： The invention concerns a method of impedance groundfault detection for differential protection of an overhead transmission line in a three-phase high voltage electric power transmission system which comprises many lines (1,12) and many protection relays (2,4), which comprises the following steps: 1) in prefault condition: —measuring the differential current (I); —measuring the phase voltage (II) at the relay location; —measuring the phase current (III) the relay location; —calculating the differential admittance (IV), with the following equation: (formula (V)). With (VI): the positive sequence impedance of the line-protected. 2) In operating condition: —measuring the differential current (VII); —measuring the phase voltage (VIII) at the relay location; —measuring the phase current (IX) at the relay location; calculating the differential admittance (X), with the following equation: (formula (XI)); —detecting a high impedance groundfault detection, if the following formula is verified: (XII) with (XIII); B0=the total line admittance. I _ dph pre ( I ) U _ fph pre ( II ) I _ fph pre ( III ) Y _ d pre ( IV ) Y _ d pre = I _ dph pre U _ fph pre - 0.5 Z L 1 I _ fph pre ( V ) Z L 1 ( VI ) I _ dph ( VII ) U _ jph ( VIII ) I _ jph ( IX ) Y _ d ( X ) Y _ d - I _ dph U _ jph - 0.5 Z L 1 I _ jph ( XI ) abs ( Y _ dN ) > 0.75 B d ( XII ) Y _ dR = Y _ d - Y _ d pre ( XIII )
摘要翻译： 本发明涉及一种用于三相高压电力传输系统中架空输电线路的差动保护的阻抗接地故障检测方法，该系统包括许多线路（1,12）和许多保护继电器（2,4），其包括 以下步骤：1）在预失效条件下： - 测量差动电流（I）; - 测量继电器位置的相电压（II）; - 测量相电流（III）继电器位置; 用下式计算微分导纳（IV）：（式（V））。 带（VI）：线路保护的正序阻抗。 2）运行条件： - 测量差动电流（VII）; - 测量继电器位置处的相电压（VIII）; - 在继电器位置测量相电流（IX）; 用下式计算差分导纳（X）：（式（XI））; - 检测高阻抗接地故障检测，如果验证以下公式：（XII）与（XIII）; B0 =总线路导纳。 I _ dph pre（I）U _ fph pre（II）I _ fph pre（III）Y _ d pre（IV）Y _ d pre = I _ dph pre U _ fph pre-0.5Z ZL _ fph pre（V）ZL 1（VI）I _ dph（VII）U _ jph（VIII）I _ jph（IX）Y _ d（X）Y _ d - I _ dph U _ jph - 0.5 （XII）Y = d（XII）Y _ dR = Y _ d - Y _ d（XIII）
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公开(公告)号：US20090309612A1
公开(公告)日：2009-12-17
申请号：US12441678
申请日：2006-09-19
申请人： Ari Wahlroos , Janne Altonen
发明人： Ari Wahlroos , Janne Altonen
CPC分类号： H02H3/402
摘要： A method and a system for determining a circular characteristic for distance protection of a three-phase electric line, the system comprising means for detecting a fault on the electric line, means for identifying a faulted phase or phases of the electric line, means for determining, at a measuring point, a first fault loop impedance by using voltage(s) of the faulted phase(s), a second fault loop impedance by using a polarization voltage and a third fault loop impedance by using predetermined line parameters, and means for determining a radius and midpoint of the circular characteristic.
摘要翻译： 一种用于确定三相电线的距离保护的圆形特性的方法和系统，所述系统包括用于检测电线上的故障的装置，用于识别电线的故障相或相的装置，用于确定 在测量点，通过使用故障相位的电压，第一故障回路阻抗，通过使用预定线路参数使用极化电压和第三故障回路阻抗的第二故障回路阻抗，以及用于 确定圆形特征的半径和中点。
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公开(公告)号：US20040021995A1
公开(公告)日：2004-02-05
申请号：US10213037
申请日：2002-08-05
IPC分类号： H02H003/00
摘要： The fault detection system includes at least one valid zero sequence voltage source, either from a local relay or a remote relay on a protected line. Zero sequence current is selected between total (vector sum from both ends of the protected line) measured zero sequence current or calculated zero sequence current. A zero sequence impedance-based calculation is then made and the result is compared against a threshold value to produce a trip decision. The trip decision is then applied through a normal tripping circuit or a slow tripping circuit, depending upon selected circuit conditions, involving the local and remote ends of the line.
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