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8 条记录 (耗时 0.011 秒)

    AN ARRANGEMENT FOR PROTECTING EQUIPMENT OF A POWER SYSTEM
    2.
    发明公开
    AN ARRANGEMENT FOR PROTECTING EQUIPMENT OF A POWER SYSTEM 有权
    安排电力系统设备保护

    公开(公告)号：EP2443718A1

    公开(公告)日：2012-04-25

    申请号：EP09779747.6

    申请日：2009-06-15

    申请人： ABB Technology AG

    发明人： GAJIC, Zoran

    IPC分类号： H02J3/24 ,  H02H3/46

    CPC分类号： H02J3/14 ,  H02J13/0017 ,  Y02B70/3225 ,  Y02B90/2607 ,  Y04S20/222 ,  Y04S40/12 ,  Y10T307/544

    摘要： An arrangement for protecting equipment of an AC electrical power system comprises first means configured to measure the frequency of the current and voltage at at least one location in the electrical power system along an interconnection between two theoretical electric machines of an equivalent two machine system. Fourth means are configured to use the values of the frequency of the current and voltage measured to determine whether a power swing has occurred and if an occurrence of a power swing has been determined determine whether the measuring location is located on a motor side or a generator side of a potential pole slip electrical centre along said interconnection, the electrical centre being defined as the location where the voltage becomes zero during a pole slip, and send this information further to third means for use in a control for protecting equipment of the electrical power system.

    DEVICE AND METHOD FOR DETECTING A GROUND FAULT
    4.
    发明公开
    DEVICE AND METHOD FOR DETECTING A GROUND FAULT 有权
    设备和检测方法的接地故障

    公开(公告)号：EP2596373A1

    公开(公告)日：2013-05-29

    申请号：EP10735255.1

    申请日：2010-07-19

    申请人： ABB Technology AG

    发明人： GAJIC, Zoran

    IPC分类号： G01R27/16 ,  G01R27/18 ,  G01R31/02 ,  G01R31/06 ,  G01R31/34 ,  H02H5/10 ,  H02H11/00

    CPC分类号： G01R31/025 ,  G01R31/34 ,  H02H3/17

    摘要： The present invention relates to an arrangement to detect a ground fault in an AC electric circuit (1) comprising an electric machine (10) having a neutral point (14) connecting to a neutral point and a terminal side (13), and a unit transformer (16) connected to the terminal side of the machine, wherein the arrangement comprises a signal injection unit (20), a voltage transformer (30) having a primary winding (31) connected to the terminal side (13) of the electric machine and a secondary winding (32) that is open delta-connected, an instrument transformer (40, 45) having a primary winding (48) connected to the neutral point (14) of the electric machine and a secondary winding (49), and a ground fault detecting unit (50). The signal injection unit (29) is configured to inject a signal to the secondary winding (32) of the voltage transformer (30). The instrument transformer (40, 45) is configured to measure the resultant injected signal at its secondary winding (49), and the ground fault detecting unit (50) is configured to detect a ground fault based on the measured signal.

    DIFFERENTIAL PROTECTION METHOD, SYSTEM AND DEVICE
    5.
    发明公开
    DIFFERENTIAL PROTECTION METHOD, SYSTEM AND DEVICE 有权
    差动保护的方法，系统及设备

    公开(公告)号：EP2206208A1

    公开(公告)日：2010-07-14

    申请号：EP07821839.3

    申请日：2007-10-25

    申请人： ABB Technology AG

    发明人： GAJIC, Zoran ,  LUNDQVIST, Bertil

    IPC分类号： H02H3/30

    CPC分类号： H02H3/305

    摘要： The invention relates to a differential protection method in a power network for determining type of fault occurring within the power network. The power network comprises a protected object having two or more ends, and a current differential protection device (12, 14) and a current transformer (11, 13) are arranged at each end (A, B). The method comprises the steps: obtaining, at a first end of the protected object, measured values from a second end of the protected object; comparing, at the first end, changes in measured values taken at the first end with changes in the measured values obtained from the second end; and determining, upon the step of comparing changes in measured values showing differing results, type of fault occurring within the power network.

    METHOD AND ARRANGEMENT FOR CAPACITOR BANK PROTECTION
    8.
    发明公开
    METHOD AND ARRANGEMENT FOR CAPACITOR BANK PROTECTION 有权
    方法和系统电容器组的保护

    公开(公告)号：EP2596564A1

    公开(公告)日：2013-05-29

    申请号：EP11729385.2

    申请日：2011-05-26

    申请人： ABB Technology AG

    发明人： GAJIC, Zoran

    IPC分类号： H02H7/16 ,  H02J3/18

    CPC分类号： H02H7/16 ,  H02J3/1828 ,  Y02E40/30

    摘要： The present invention relates to a method for protecting against a failure within a multi-phase capacitor bank (1 ) comprising a plurality of capacitor units (30, U1
    1 ,...,U1
    i , U1
    i+1 , U2
    1 ,...,U2
    i , U2
    i+1 , U3
    1 ,...,U3
    i , U3
    i+1 ) each comprising a plurality of capacitor elements (40) connected to each other, wherein capacitor units are connected to each other and the failure may involve two neighboring capacitor units. The method comprises steps of measuring the current of each individual phase of the capacitor bank (100), calculating the magnitude of an unbalanced current (I
    unbalanced ) based on the measured currents (110), measuring the voltage of each individual phase of the capacitor bank (120), calculating the magnitude of an unbalanced voltage (U
    unbalanced ) based on the measured voltages (130), determining an operating point (U
    unbalanced , I
    unbalanced ) based on the calculated the magnitudes of the unbalanced current and the unbalanced voltage (140), examining where the defined operating point (U
    unbalanced , I
    unbalanced ) is located in a specified operating region (150), and initializing a trip signal based on the location of the defined operating point (U
    unbalanced , I
    unbalanced ) in the specified operating region (190, 190').