中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

39 records (took 0.021 seconds)

    25.
    发明专利
    未知

    公开(公告)号：SE0302574D0

    公开(公告)日：2003-09-26

    申请号：SE0302574

    申请日：2003-09-26

    Applicant: ABB RESEARCH LTD

    Inventor： LINDAHL STURE ,  JOHANSSON KENNETH ,  FROMM UDO ,  JOHANSSON STEFAN

    IPC: H02J20060101 ,  H02J3/18 ,  H02J3/22 ,  H02J

    Abstract: A high voltage AC transmission cable system for transmitting power between two points, each connected to one or more power networks, and a method to operate the system. At least one transformer is arranged at each end of the AC transmission cable, wherein at least one of the transformers is arranged to operate the transformer at a voltage whereby losses due to reactive power transport and dielectric losses are minimized. The AC cable is run at a variable voltage regulated such that the voltage is a function of the load for the transmission cable. This operating voltage is not necessarily the same as the nominal voltages in the connection points. A control and communication system and a graphical user interface for carrying out the method are also provided.

    APPARATUS FOR DETECTING ELECTRIC DISCHARGES IN AN OBJECT UNDER EXAMINATION, PREFERABLY IN A CABLE JOINT
    26.
    发明专利
    APPARATUS FOR DETECTING ELECTRIC DISCHARGES IN AN OBJECT UNDER EXAMINATION, PREFERABLY IN A CABLE JOINT 未知

    公开(公告)号：PL335505A1

    公开(公告)日：2000-04-25

    申请号：PL33550598

    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.

    A device for sensing electric discharges in test object, preferably a cable joint
    29.
    发明专利
    A device for sensing electric discharges in test object, preferably a cable joint 未知

    公开(公告)号：AU6427998A

    公开(公告)日：1998-09-29

    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.

Patent Agency Ranking