公开(公告)号：SE9700836D0

公开(公告)日：1997-03-10

申请号：SE9700836

申请日：1997-03-10

Applicant: ABB RESEARCH LTD

Inventor： ERIKSSON THOMAS ,  JOHANSSON KENNETH

IPC: G01R31/12 ,  G01N

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.

公开(公告)号：SE9500909L

公开(公告)日：1996-09-16

申请号：SE9500909

申请日：1995-03-15

Applicant: ABB RESEARCH LTD

Inventor： JOHANSSON KENNETH ,  TOERNKVIST CHRISTER

IPC: H02M9/02 ,  H03K3/53

Abstract: PCT No. PCT/SE96/00289 Sec. 371 Date Dec. 12, 1997 Sec. 102(e) Date Dec. 12, 1997 PCT Filed Mar. 5, 1996 PCT Pub. No. WO96/28887 PCT Pub. Date Sep. 19, 1996A device for generation of electric square pulses with a short rise time, comprises at least an energy-storing capacitor in the form of a coaxial cable with an insulated screen, wherein essentially the whole coaxial cable is wound up in an inner closed cylindrical container of metal, a direct-voltage source for charging this screen, and devices for short-circuiting the screen to zero potential during generation of pulses. These devices together with the inner cylindrical metal container are enclosed in an outer closed container of metal, and one end of the coaxial cable is intended for connection to a load and the other end of the coaxial cable terminates with a resistor which has the characteristic impedance of the cable. Between the inner cylindrical container and the outer container, a ferrite ring-core is placed around the devices for short-circuiting and both cable ends.

公开(公告)号：SE9500909D0

公开(公告)日：1995-03-15

申请号：SE9500909

申请日：1995-03-15

Applicant: ABB RESEARCH LTD

Inventor： JOHANSSON KENNETH ,  TOERNKVIST CHRISTER

IPC: H02M9/02 ,  H03K3/53

Abstract: PCT No. PCT/SE96/00289 Sec. 371 Date Dec. 12, 1997 Sec. 102(e) Date Dec. 12, 1997 PCT Filed Mar. 5, 1996 PCT Pub. No. WO96/28887 PCT Pub. Date Sep. 19, 1996A device for generation of electric square pulses with a short rise time, comprises at least an energy-storing capacitor in the form of a coaxial cable with an insulated screen, wherein essentially the whole coaxial cable is wound up in an inner closed cylindrical container of metal, a direct-voltage source for charging this screen, and devices for short-circuiting the screen to zero potential during generation of pulses. These devices together with the inner cylindrical metal container are enclosed in an outer closed container of metal, and one end of the coaxial cable is intended for connection to a load and the other end of the coaxial cable terminates with a resistor which has the characteristic impedance of the cable. Between the inner cylindrical container and the outer container, a ferrite ring-core is placed around the devices for short-circuiting and both cable ends.

公开(公告)号：SE526001C2

公开(公告)日：2005-06-14

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

公开(公告)号：SE0302966L

公开(公告)日：2005-05-08

申请号：SE0302966

申请日：2003-11-07

Applicant: ABB RESEARCH LTD

Inventor： LIU RONGSHENG ,  JOHANSSON STEFAN ,  JOHANSSON KENNETH ,  HOLMGREN BJOERN ,  BROSIG GERHARD ,  JIANG LIN ,  BORMANN DIERK ,  VALDEMARSSON STEFAN ,  BENGTSSON TORD ,  LARSSON DAVID

IPC: H01B9/02 ,  H01B7/14

公开(公告)号：DE69730167D1

公开(公告)日：2004-09-09

申请号：DE69730167

申请日：1997-10-08

Applicant: ABB RESEARCH LTD

Inventor： JOHANSSON KENNETH ,  KOLS HAKAN

IPC: G01R15/14 ,  G01R31/12 ,  H02H7/04

公开(公告)号：SE513745C2

公开(公告)日：2000-10-30

申请号：SE9500909

申请日：1995-03-15

Applicant: ABB RESEARCH LTD

Inventor： JOHANSSON KENNETH ,  TOERNKVIST CHRISTER

IPC: H02M9/02 ,  H03K3/53

Abstract: PCT No. PCT/SE96/00289 Sec. 371 Date Dec. 12, 1997 Sec. 102(e) Date Dec. 12, 1997 PCT Filed Mar. 5, 1996 PCT Pub. No. WO96/28887 PCT Pub. Date Sep. 19, 1996A device for generation of electric square pulses with a short rise time, comprises at least an energy-storing capacitor in the form of a coaxial cable with an insulated screen, wherein essentially the whole coaxial cable is wound up in an inner closed cylindrical container of metal, a direct-voltage source for charging this screen, and devices for short-circuiting the screen to zero potential during generation of pulses. These devices together with the inner cylindrical metal container are enclosed in an outer closed container of metal, and one end of the coaxial cable is intended for connection to a load and the other end of the coaxial cable terminates with a resistor which has the characteristic impedance of the cable. Between the inner cylindrical container and the outer container, a ferrite ring-core is placed around the devices for short-circuiting and both cable ends.

公开(公告)号：NO984230A

公开(公告)日：1998-11-12

申请号：NO984230

申请日：1998-09-14

Applicant: ABB RESEARCH LTD

Inventor： JOHANSSON KENNETH ,  T RNKVIST CHRISTER

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

CPC classification number: G01R31/1209 ,  G01R29/24

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.

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.