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    3.
    发明专利
    未知

    公开(公告)号：BR9606646A

    公开(公告)日：1997-09-30

    申请号：BR9606646

    申请日：1996-09-10

    Applicant: ABB RESEARCH LTD

    Inventor： BENGTSSON TORD ,  DAHLBERG LARS GUNNAR ,  ERIKSSON THOMAS ,  KHEIRMAND AKBAR ,  LEIJON MATS ,  SIBERG HENRY ,  RUDOLFSSON DICK ,  WINKLER DAG

    IPC: G01R15/18 ,  G01R31/02 ,  G01R31/12 ,  G01R31/333

    Abstract: PCT No. PCT/SE96/01126 Sec. 371 Date May 12, 1997 Sec. 102(e) Date May 12, 1997 PCT Filed Sep. 10, 1996 PCT Pub. No. WO97/10515 PCT Pub. Date Mar. 20, 1997A device for sensing electric discharges in a test object with at least two electric connection conductors comprises transducer equipment and evaluation equipment. The transducer equipment comprises at least one transducer for direction-sensitive sensing of current pulses through the connection conductors by sensing a magnetic field, generated by the current pulses, and the polarity thereof. The transducer delivers a transducer signal to the evaluation equipment in dependence on said current pulses and their direction. The evaluation equipment generates, in dependence on received transducer signals, an indicated signal indicating an electric discharge in the test object.

    ARC DETECTOR AND ASSOCIATED METHOD FOR DETECTING UNDESIRED ARCS
    6.
    发明专利
    ARC DETECTOR AND ASSOCIATED METHOD FOR DETECTING UNDESIRED ARCS 未知

    公开(公告)号：CA2721906A1

    公开(公告)日：2009-10-29

    申请号：CA2721906

    申请日：2009-04-21

    Applicant: ABB RESEARCH LTD

    Inventor： ERIKSSON THOMAS ,  HALEN STEFAN ,  HEDBERG JONAS

    IPC: H02H1/00 ,  H02H7/055

    Abstract: It is presented an arc detector for detecting undesired arcs. The arc detector comprises: an antenna for receiving an electromagnetic signal representing an arc; and a discriminator for analysing a signal from the antenna, the discriminator comprising a spectrum analyser arranged to detect whether the signal represents a normal arc or an undesired arc. The discriminator is arranged to detect whether the signal represents a normal arc or an undesired arc by comparing signal levels at frequencies of a spectrum of the signal corresponding to at least one partial reference spectrum, and determining the arc to be a normal arc if a deviation from the reference spectrum is less than a threshold deviation. A corresponding method is also presented.

    A DEVICE FOR SENSING ELECTRIC DISCHARGES IN TEST OBJECT, PREFERABLY A CABLE JOINT
    8.
    发明专利
    A DEVICE FOR SENSING ELECTRIC DISCHARGES IN TEST OBJECT, PREFERABLY A CABLE JOINT 未知

    公开(公告)号：CA2283123A1

    公开(公告)日：1998-09-17

    申请号：CA2283123

    申请日：1998-03-09

    Applicant: ABB RESEARCH LTD

    Inventor： ERIKSSON THOMAS ,  JOHANSSON KENNETH

    IPC: G01R31/12

    Abstract: A device for sensing electric discharges in a test object (1) with two electric connection conductors (1a, 1b, 1c, 1d), preferably a cable joint, comprises at least one first and one second sensor (2a, 2b) and evaluation equipment (EVU). Each one of the sensors generates and supplies to the evaluation equipment sensor signals in dependence on current pulses through the connection conductors and the direction thereof, the first sensor a first sensor signal (v1) and the second sensor a second sensor signal (v2). The evaluation equipment generates in dependence on received sensor signals an indication signal (IND), indicating an electric discharge in the test object. The device comprises a first tuning unit (T1) associated with the first sensor and a second tuning unit (T2) associated with the second sensor, each unit, in dependence on the respective sensor signal, forming a first filter signal (SF1) and a second filter signal (SF2), respectively, periodically oscillating with a preselected period (TP), as well as a multiplying member (MU), which is supplied with, and in dependence on said filter signals, forms a product signal (SP), whereby the evaluation equipment forms the indication signal in dependence on the product signal.

    DISPOSITIVO PARA LA DETECCION DE DESCARGAS ELECTRICAS EN UN OBJETO DE PRUEBAS
    9.
    发明专利
    DISPOSITIVO PARA LA DETECCION DE DESCARGAS ELECTRICAS EN UN OBJETO DE PRUEBAS 未知

    公开(公告)号：PE50298A1

    公开(公告)日：1998-09-08

    申请号：PE00090396

    申请日：1996-12-12

    Applicant: ABB RESEARCH LTD

    Inventor： RUDOLFSSON DICK ,  WINKLER DAG ,  SIBERGV HENRY ,  BENGTSSON TORD ,  DAHLBERG LARS-GUNNAR ,  ERIKSSON THOMAS ,  KHEIRMAND AKBAR ,  LEIJON MATS

    IPC: G01R31/02 ,  G01R15/18 ,  G01R31/12 ,  G01R31/333

    Abstract: SIENDO UN OBJETO DE PRUEBAS ESTA PROVISTO POR LO MENOS DE DOS CONDUCTORES DE CONEXION ELECTRICA, Y COMPRENDE: A) UN EQUIPO TRANSDUCTOR Y B) UN EQUIPO DE EVALUACION, EL PRIMERO ESTA COMPUESTO POR LO MENOS DE UN TRANSDUCTOR PARA LA DETECCION DE IMPULSOS DE CORRIENTE QUE PASAN POR LOS CONDUCTORES DE CONEXION DETECTANDO UN CAMPO MAGNETICO GENERADO POR LOS IMPULSOS DE CORRIENTE Y SU POLARIDAD, TRANSMITIENDO EL REFERIDO TRASDUCTOR O TRANDUCTORES UNA SENAL TRANSDUCTIVA AL EQUIPO DE EVALUACION, SE CARACTERIZA PORQUE EL EQUIPO DE EVALUACION, DEPENDIENDO DE LAS SENALES TRANSDUCTIVAS RECIBIDAS, GENERA UNA SENAL DE INDICACION QUE INDICA UNA DESCARGA ELECTRICA EN EL OBJETO DE PRUEBAS, CUANDO EL EQUIPO TRANSDUCTOR DETECTA IMPULSOS DE CORRIENTE QUE FLUYEN EN ESENCIA SIMULTANEAMENTE BIEN SEA UNA DIRECCION HACIA AFUERA DEL OBJETO DE PRUEBAS A TRAVES DE LOS CONDUCTORES DE CONEXION O EN UNA DIRECCION HACIA EL INTERIOR DEL OBJETO DE PRUEBAS A TRAVES DE LOS CONDUCTORES DE CONEXION O EN UNA DIRECCION HACIA EL INTERIOR DEL OBJETO DE PRUEBAS A TRAVES DE TODOS LOS CONDUCTORES DE CONEXION

    10.
    发明专利
    未知

    公开(公告)号：SE9700836L

    公开(公告)日：1998-09-07

    申请号：SE9700836

    申请日：1997-03-10

    Applicant: ABB RESEARCH LTD

    Inventor： ERIKSSON THOMAS ,  JOHANSSON KENNETH

    IPC: G01R31/12

    Abstract: A device for sensing discharges in a test object (1) with two electric connection conductors (1a, 1b, 1c, 1d), preferably a cable joint, comprises at least one first and one second sensor (2a, 2b) and evaluation equipment (EVU). Each one of the sensors generates and supplies to the evaluation equipment sensor signals in dependence on current pulses through the connection conductors and the direction thereof, the first sensor a first sensor signal (v1) and the second sensor a second sensor signal (v2). The evaluation equipment generates in dependence on received sensor signals an indication signal (IND), indicating a partial discharge in the test object. The device comprises a first tuning unit (T1) associated with the first sensor and a second tuning unit (T2) associated with the second sensor, each unit, in dependence on the respective sensor signal, forming a first filter signal (SF1) and a second filter signal (SF2), respectively, periodically oscillating with a preselected period (TP), as well as a multiplying member (MU), which is supplied with, and in dependence on said filter signals, forms a product signal (SP), whereby the evaluation equipment forms the indication signal in dependence on the product signal.

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