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    • 6. 发明申请
    • METHOD AND ARRANGEMENT FOR AN INTERNAL FAILURE DETECTION IN A Y-Y CONNECTED CAPACITOR BANK
    • Y-Y连接电容器银行内部故障检测的方法和布置
    • WO2012110088A1
    • 2012-08-23
    • PCT/EP2011/052290
    • 2011-02-16
    • ABB RESEARCH LTDGAJIC, ZoranIBRAHIM, MustafaWANG, Jianping
    • GAJIC, ZoranIBRAHIM, MustafaWANG, Jianping
    • G01R31/02H02H7/16
    • G01R31/40G01R31/02G01R31/42G05F1/70H02H7/16H02J3/1828
    • The present invention relates to a method for detecting an internal failure in a capacitor bank connected to a power system, wherein the capacitor bank comprises a plurality of capacitor units that are divided into two Y sections. Each phase in each of the Y sections defining a leg and each leg includes series and/or parallel-connected capacitor units. The internal failure may occur in one or more capacitor elements or units or involve one or more legs. The method comprises measuring the phase current in one of the phases (100), calculating the root mean square value, denoted by RMS, of the measured phase currents (110), measuring the unbalance current between the two sections (120), calculating the RMS value of the measured unbalance currents (130), detecting the phase angle between the measured phase current and the measured unbalance current (140), calculating the per unit value of the unbalance current based on the calculated RMS value of the measured phase current and the calculated RMS value of the measured unbalance current (145), tracking and detecting a change of the unbalance current between the present calculated per unit value of the unbalance current and the previous calculated per unit value of the unbalance current (150), determining the vectorial step change of the unbalance current (160), normalizing the phase angle of the determined vectorial step change to be one of 0°, 60°, 120°, 180°, 240° and 300° (170), identifying the number of internal failures and their corresponding locations based on the determined vectorial step change of the unbalance current and the normalized phase angle (200), and initiating an alarm or a trip signal when the determined total number of internal failures exceeds a first or a second threshold value respectively (210).
    • 本发明涉及一种用于检测连接到电力系统的电容器组中的内部故障的方法,其中电容器组包括被分成两个Y部分的多个电容器单元。 限定腿部和每个腿部的每个Y部分中的每个相包括串联和/或并联连接的电容器单元。 内部故障可能发生在一个或多个电容器元件或单元中,或者涉及一个或多个支脚。 该方法包括测量相(100)中的一个相的相电流,计算测得的相电流(110)的均方根值(RMS),测量两段(120)之间的不平衡电流,计算 测量的不平衡电流的RMS值(130),检测所测量的相电流和测量的不平衡电流之间的相位角(140),基于所测量的相电流的计算的RMS值来计算不平衡电流的每单位值,以及 测量的不平衡电流(145)的计算RMS值,跟踪和检测不平衡电流当前计算的每单位值与先前计算的不平衡电流的每单位值之间的不平衡电流的变化(150),确定 将确定的矢量阶跃变化的相位角归一化为0°,60°,120°,180°,240°和300°(170)之间的不平衡电流(160)的矢量级变化,id 基于确定的不平衡电流和归一化相位角(200)的矢量级变化,确定内部故障的数量及其对应的位置,并且当所确定的内部故障的总数超过第一或 第二阈值(210)。
    • 7. 发明申请
    • METHOD AND ARRANGEMENT FOR DETECTING AN INTERNAL FAILURE IN H-BRIDGE CONNECTED CAPACITOR BANK
    • 用于检测H桥连接电容器银行内部故障的方法和布置
    • WO2012110087A1
    • 2012-08-23
    • PCT/EP2011/052279
    • 2011-02-16
    • ABB RESEARCH LTDGAJIC, ZoranWANG, JianpingIBRAHIM, Mustafa
    • GAJIC, ZoranWANG, JianpingIBRAHIM, Mustafa
    • H02H7/16G01R31/02H02H3/04
    • G01R31/028H02H7/16
    • The present invention relates to a method for detecting an internal failure in a capacitor bank connected in one phase or more phases respectively to a power system. The capacitor bank comprises a plurality of capacitor units. Each of the capacitor units comprises a plurality of capacitor elements connected in parallel and/or series. The capacitor units are further divided into two strings and a current transformer is arranged in the midpoints of the two strings so that the capacitor units are further divided into four quadrants and the internal failure(s) may occur in one or more capacitor elements or units and involves one or more capacitor quadrants. The method comprises measuring the phase current of each individual phase of the capacitor bank (100), continuously calculating the root mean square value, denoted by RMS, of the measured phase current (1 10), measuring the unbalance current (120), continuously calculating the RMS value of the measured unbalance current (130), detecting the phase angle between the measured phase current and its corresponding measured unbalance current (140), continuously calculating a per unit value of the unbalance current based on the calculated RMS value of the measured phase current and the calculated RMS value of the measured unbalance current (145), tracking and detecting a change in the calculated unbalance current between the present calculated per unit value of the unbalance current and the previous calculated per unit value of the unbalance current (160), determining the step change of the per unit value of the unbalance current (170), determining the number of internal failures and their corresponding locations based on the determined step change of the per unit value of the unbalance current and the detected phase angle (200), and initiating an alarm and/or a trip signal when the determined total number of internal elements failures exceeds a first or a second threshold value (210).
    • 本发明涉及一种用于检测在一相或更多相中连接到电力系统的电容器组中的内部故障的方法。 电容器组包括多个电容器单元。 每个电容器单元包括并联和/或串联连接的多个电容器元件。 电容器单元进一步分为两串,并且电流互感器布置在两个串的中点处,使得电容器单元进一步分成四个象限,并且内部故障可发生在一个或多个电容器元件或单元中 并且涉及一个或多个电容器象限。 该方法包括测量电容器组(100)的每个单相的相电流,连续地计算测得的相电流(110)的RMS均方根值,连续测量不平衡电流(120) 计算测量的不平衡电流(130)的RMS值,检测测得的相电流与其对应的测量不平衡电流之间的相位角(140),基于计算的不平衡电流的RMS值连续计算不平衡电流的每单位值 测量相电流和测得的不平衡电流的计算RMS值(145),跟踪和检测不平衡电流当前计算出的每单位值与先前计算的不平衡电流单位值之间的计算不平衡电流的变化( 160),确定不平衡电流(170)的每单位值的阶跃变化,确定内部故障的数量及其cor 基于确定的不平衡电流的每单位值的步长变化和检测到的相位角(200)的响应位置,以及当所确定的内部元件故障的总数超过第一或第二相位角时,发起报警和/或跳闸信号 第二阈值(210)。