公开(公告)号：EP2710700B1

公开(公告)日：2015-11-25

申请号：EP11723397.3

申请日：2011-05-19

申请人： ABB Technology AG

发明人： LUNDQVIST, Bertil

IPC分类号： H02H7/26 ,  H02H3/28 ,  H02H1/04

CPC分类号： H02H3/283 ,  H02H1/043 ,  H02H3/30 ,  H02H7/261

公开(公告)号：EP2859635A1

公开(公告)日：2015-04-15

申请号：EP12878421.2

申请日：2012-06-06

申请人： ABB Technology Ltd.

发明人： LI, Youyi ,  LIU, Kai ,  SU, Bin

IPC分类号： H02H3/28 ,  H04B14/06

CPC分类号： G01R31/3278 ,  H02H3/28 ,  H02H3/283

摘要： A method for identifying the fault by current differential protection and a device thereof are provided. The method comprises: measuring the full component currents of the two terminals of a two-terminal line system and calculating the corresponding fault component current vectors; obtaining an operate value by calculating a first difference between an absolute value of the sum of the fault component current vectors and Iset1; obtaining a restrain value by multiplying a second difference with a control factor, in which the second difference is calculated between the maximum of the absolute values of the fault component currents and Iset2 or between the absolute value of the difference of said fault component currents and Iset2; and identifying a fault as an external one or internal one by comparing the operate value with the restrain value. The solutions of the present intention achieve better reliability, sensitivity and faster speed than existing products.

公开(公告)号：EP2747229A1

公开(公告)日：2014-06-25

申请号：EP13306656.3

申请日：2013-12-03

申请人： Schneider Electric Industries SAS

发明人： Song, Juzhong

IPC分类号： H02H3/28 ,  H02H7/045 ,  G01R15/18

CPC分类号： H02H3/283 ,  G01R31/027 ,  H02H7/0455

摘要： There is provided a method for predicting a current transformer saturation, comprising: detecting a first current from a first current transformer at a high voltage side of a transformer and detecting a second current from a second current transformer at a low voltage side of the transformer; calculating a first fundamental vector, a first DC component and a first total RMS of the first current, and calculating a second fundamental vector, a second DC component and a second total RMS of the second current; and generating a prediction signal for the current transformer saturation according to the first fundamental vector, the first DC component, the first total RMS, the second fundamental vector, the second DC component and the second total RMS. The current transformer saturation may be predicted effectively before it triggers a differential protection of the transformer, thus a differential protection mal-operation of the transformer may be avoided.

摘要翻译： 本发明提供了用于预测电流互感器饱和的方法，包括：在一个变压器的高电压侧的检测从第一电流互感器的第一电流和所述变压器的低电压侧检测来自第二电流互感器的第二电流; 计算第一基本向量，第一DC分量和所述第一电流的第一总RMS，并计算第二基本矢量，第二DC分量和所述第二电流的第二总RMS; 和产生用于电流互感器饱和gemäß的预测信号，以所述第一基本向量，第一个直流分量，所述第一总RMS，第二基本矢量，第二DC分量和所述第二总RMS。 它触发变压器的差动保护，因而差动保护变压器的次操作可避免前的电流互感器饱和可有效地预测。

公开(公告)号：EP1230721A1

公开(公告)日：2002-08-14

申请号：EP00970789.4

申请日：2000-10-11

申请人： Schweitzer Engineering Laboratories, Inc.

发明人： GUZMAN-CASILLAS, Armando

IPC分类号： H02H3/28

CPC分类号： H02H3/283 ,  H02H3/081

摘要： A differential relay for protecting a power apparatus portion of a power system, such as a bus line, includes incoming and outgoing power lines on which incoming and outgoing currents are present. The incoming and outgoing currents of each phase are applied trhough current transformers and then through filtering and normalizing circuits prior to application to the differential relay. The differential relay includes a circuit for determining the presence of an external fault, and maintains security by avoiding a tripping action of the relay for said external faults. Further, the relay includes circuits which in response to the external fault evolving to an internal fault alters the operation of a portion of the relay, by increasing the gain for the restraint current, enabling a directional element for supervision of the differential relay, and for extending the immediate post-fault value of restraint current, and adding a time delay for a selected period of time, all of which are used to identify an external fault evolving into an internal fault.

公开(公告)号：EP0384306A1

公开(公告)日：1990-08-29

申请号：EP90103001.5

申请日：1990-02-16

申请人： Licentia Patent-Verwaltungs-GmbH

发明人： Meinhardt, Peter, Dr.-Ing.

IPC分类号： H02H3/28

CPC分类号： H02H3/28 ,  H02H3/283

摘要： Gegenstand der Erfindung ist ein Verfahren zum Erzeugen von Auslösesig­nalen für Schalter bei Kurzschlusströmen an Sammelschienen und/oder Sammelschienenabschnitten. Die Summe zyklisch erfasster Augenblickswerte der Ströme der Zu-und Abgänge der Sammelschiene bzw. der Sammelschienen wird jeweils für mindestens eine Phase gebildet und mit einem Schwellen­wert verglichen, dessen Höhe einem unerwünscht grossen Fehlerstrom entspricht. Der Zeitpunkt eines Fehlereintritts wird festgestellt. Bei einer Schwellenüberschreitung unmittelbar nach dem Zeitpunkt des Fehler­eintritts wird ein Aus-Kommando für mindestens einen Leistungsschalter erzeugt.

摘要翻译： 本发明的主题是一种用于在母线和/或母线段的短路电流的情况下产生用于断路器跳闸信号的处理。 入口和母线或汇流条的出口的电流周期性地检测瞬时值的总和在每种情况下形成有用于至少一个相，并与其大小对应于不期望的大的故障电流阈值进行比较。 当故障的发生的时间是确定的开采。 如果在时间之后立即超过阈值用于至少一个电力断路器中产生发生在关断命令故障。

公开(公告)号：EP0196066A2

公开(公告)日：1986-10-01

申请号：EP86104089.7

申请日：1986-03-25

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Anzai, Toshio c/o MITSUBISHI DENKI K.K.

IPC分类号： H02H3/28 ,  H02H7/22 ,  H02H1/04

CPC分类号： H02H3/283

摘要： In a protective relay employing a digital computer and making decisions on operating conditions of an electric power system for protecting equipment in the system, computation circuits of the protective relay is adapted such that output of a first comparison and decision element for making a decision in accordance with a first principle expression and output of second comparison and decision element for making a decision in accordance with a second principle expression are input to an inhibit element whereby a final output is delivered.

摘要翻译： 在采用数字计算机并对用于保护系统中的设备的电力系统的操作条件作出决定的保护继电器中，保护继电器的计算电路适于使得第一比较和判定元件的输出用于根据 其中用于根据第二原理表达式做出判定的第二比较和判定元件的第一原理表达式和输出被输入到禁止元件，由此传送最终输出。

公开(公告)号：EP0109629A1

公开(公告)日：1984-05-30

申请号：EP83111311.3

申请日：1983-11-12

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Usui, Masaji Mitsubishi Denki Kabushiki Kaisha

IPC分类号： H02H3/28

CPC分类号： H02H3/283 ,  H02H7/22

摘要： A current ratio-differential relay for protecting a power system comprises a logical circuit which provides the final output upon determination that the operating force signal is active and the suppressing force signal is inactive. The operating force signal is made active when the scalar quantity of the vector summation of line currents flowing into and out of the bus-bar is larger than a certain value, and the suppressing force signal is made active when the maximum value of scalar quantities of the line currents is larger than the scalar quantity of the vectorially-summed current multiplied by a certain constant. Both signals are supplied to the logical circuit through circuit means having a certain time delay in the restoring operation.

公开(公告)号：EP2590287A4

公开(公告)日：2016-10-05

申请号：EP11800434

申请日：2011-06-29

申请人： TOSHIBA KK

发明人： KASE TAKAHIRO

IPC分类号： H02H3/28

CPC分类号： H02H3/26 ,  H02H3/283 ,  H02H7/26

摘要： Provided is a current differential relay apparatus, wherein malfunctions of apparatuses are prevented by letting the relay continue the function thereof even when saturation of a current transformer occurs due to an internal accident. A ratio differential characteristic evaluation unit (14), which is for evaluating a ratio differential characteristic functioning on the basis of the amount of operation (Id) and the amount of inhibition (Ir), comprises: a first current-range evaluation unit (14-1) that evaluates, when a relationship of a 1 ‰¤ a 2 and b 1 ‰¥ b 2 holds true wherein a 1 , a 2 , b 1 , and b 2 are real numbers, that a functioning thereof be implemented when Id > a 1 Ir + b 1 ; a second current-range evaluation unit (14-2) that evaluates that a functioning thereof be implemented when Id > a 2 Ir + b 2 ; and an AND operation unit (14-3), a reset unit (14-4), and a flip-flop unit (14-5) that evaluate that a ratio differential characteristic functioning be implemented when evaluations are made at both the first and second current ranges that functioning thereof be implemented, and makes the functioning thereof be continued until the functioning at the first range is reset.

公开(公告)号：EP2901534A1

公开(公告)日：2015-08-05

申请号：EP12801494.1

申请日：2012-11-26

申请人： Siemens Aktiengesellschaft

发明人： MIESKE, Frank

IPC分类号： H02H3/28

CPC分类号： G01R31/088 ,  G01R19/10 ,  G01R31/40 ,  H02H3/283 ,  H02H7/045 ,  H02H7/0455

摘要： The invention relates to a differential protection method for generating a fault signal (F), wherein current measurement values are in each case measured on at least two different measuring points (12a, 12b) of a component, differential current values and stabilising values are formed using the current measurement values, and the fault signal (F) is generated when in the context of a tripping range test it is ascertained that a measured value pair formed using one of the differential current values and the respective associated stabilising value lies in a predetermined tripping range (30). In order that in the event of transducer saturation it is possible to distinguish selectively between an external fault and an internal fault and to generate a fault signal with high security if an internal fault is ascertained, differential current values are estimated from successive differential current values and associated stabilising values and associated estimated stabilising values differential current values and associated estimated stabilising values are formed, by means of which at least one value of an expected future trend of the differential current values and of the stabilising current values is estimated, and for the tripping range test the position of a measured value pair formed from an estimated differential current value and the respective associated estimated stabilising value. The invention further relates to an electrical protective device (10) having a correspondingly designed evaluation unit (40).

公开(公告)号：EP2057726A1

公开(公告)日：2009-05-13

申请号：EP06791354.1

申请日：2006-08-31

申请人： SIEMENS AKTIENGESELLSCHAFT

发明人： BÖHME, Klaus

IPC分类号： H02H3/28

CPC分类号： H02H3/283

摘要： The invention relates to a differential protection method for generating a fault signal (F). According to said method, current measured values (I1 (t), I2 (t)) are measured at least at two different measuring points (40, 50) on a component (80, 410) and are used to form differential current values (I-DIFF) and stabilising values (I-STAB), the fault signal being generated if a tripping range test establishes that a measured value pair, consisting of one of the differential current values and its associated stabilising value, lies within a predefined tripping range (320, 320'). According to the invention, the similarity of the current profiles is tested and a modified trigger range test is carried out depending on the degree of similarity (A), said trigger range test being modified in such a way that the trigger sensitivity for generating the fault signal is reduced as the similarity of the current profiles decreases.