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    A METHOD AND A DEVICE FOR SPACE-CHARGE MEASUREMENT IN CABLESUSING A PULSED ELECTROACOUSTIC METHOD
    33.
    发明专利
    A METHOD AND A DEVICE FOR SPACE-CHARGE MEASUREMENT IN CABLESUSING A PULSED ELECTROACOUSTIC METHOD 未知

    公开(公告)号：CA2248610C

    公开(公告)日：2002-04-02

    申请号：CA2248610

    申请日：1997-03-13

    Applicant: ABB RESEARCH LTD

    Inventor： TORNKVIST CHRISTER ,  JOHANSSON KENNETH

    IPC: G01R31/02 ,  G01R29/24 ,  G01R31/12 ,  G01N29/14

    Abstract: A method for space-charge measurement in a coaxial cable comprising an inner conductor (2), a cable screen (3) and an electric insulation (4) between the inner conductor and the cable screen, wherein the cable screen is removed on both sides of a measurement region, an electric voltage pulse is generated by an electric pulse generator (10) a nd is applied over part of the insulation (4) of the cable within the measurement range, an acoustic signal, in the presence of space charges in the cable insulation is generated by the voltage pulse in cooperation with the space charges and a possible acoustic signal is recorde d by a sound-recording device (8). A grounded annular outer electrode (7) is applied around the measurement region, the sound-recording device is arranged in direct contact with the annular outer electrode, the voltage pulse is applied to the cable screen on both sides of the measurement region and is connected, via the impedance of the cable, to the inner conductor of the cable.

    A device for sensing electric discharges in test object, preferably a cable joint
    34.
    发明专利
    A device for sensing electric discharges in test object, preferably a cable joint 未知

    公开(公告)号：AU719826B2

    公开(公告)日：2000-05-18

    申请号：AU6427998

    申请日：1998-03-09

    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.

    36.
    发明专利
    未知

    公开(公告)号：SE508160C2

    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.

    A METHOD AND A DEVICE FOR SPACE-CHARGE MEASUREMENT IN CABLES USING A PULSED ELECTROACOUSTIC METHOD
    37.
    发明专利
    A METHOD AND A DEVICE FOR SPACE-CHARGE MEASUREMENT IN CABLES USING A PULSED ELECTROACOUSTIC METHOD 未知

    公开(公告)号：CA2248610A1

    公开(公告)日：1997-09-18

    申请号：CA2248610

    申请日：1997-03-13

    Applicant: ABB RESEARCH LTD

    Inventor： TOERNKVIST CHRISTER ,  JOHANSSON KENNETH

    IPC: G01R31/02 ,  G01R29/24 ,  G01R31/12 ,  G01N29/14

    Abstract: A method for space-charge measurement in a coaxial cable comprising an inner conductor (2), a cable screen (3) and an electric insulation (4) between the inner conductor and the cable screen, wherein the cable screen is removed on both sides of a measurement region, an electric voltage pulse is generated by an electric pulse generator (10) and is applied over part of the insulation (4) of the cable within the measurement range, an acoustic signal, in the presence of space charges in the cable insulation is generated by the voltage pulse in cooperation with the space charges and a possible acoustic signal is recorded by a sound-recording device (8). A grounded annular outer electrode (7) is applied around the measurement region, the sound-recording device is arranged in direct contact with the annular outer electrode, the voltage pulse is applied to the cable screen on both sides of the measurement region and is connected, via the impedance of the cable, to the inner conductor of the cable.

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