公开(公告)号：DE59814409D1

公开(公告)日：2009-12-17

申请号：DE59814409

申请日：1998-09-22

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS DR ,  BRAENDLE HUBERT DR ,  GABUS PHILIPPE ,  KOSTOVIC JADRAN ,  TALIR JIRI

IPC: G01R15/24

Abstract: The spacers (5) are electrically conductive and contact adjacent sensor sections (2). The voltage sensor (1) high tension section is qualified for open air use. This derives from the high tension dielectric and protective screen (against weather) surrounding the assembly of sensor- and spacer sections. The sensor is made of individual sections, and a continuous sensor fiber (4a). In each section, a given length of optical fiber is fastened to the body (3) such that its length is varied only by E-field components parallel to the sensor axis. The amplification factor of each section is proportional to its length, in correspondence with the piezoelectrically-induced length variation of the fiber. Sensor sections and spacers are cylindrical and aligned along the sensor axis. Between sensors and spacers, there are conductive flexible holders (6). The holders include inner- and control electrodes, with spring sections. Inner electrodes bond and interlock with the end surfaces of sensor elements. Control electrodes are fastened onto the inner electrodes. Spring sections connect the inner electrodes to adjacent spacer sections. The dielectric is an elastomer or insulating fluid. The protecting screen is an elastomer with additional support insulator. The silicone body may have an additional fiberglass-reinforced plastic insulating rod. A version using a dielectric of transformer- or silicone oil is also described. The connection contacts (1a) of the high tension section comprise flanges, a hanger and a corona- and/or voltage control ring. An earthing and anchoring cable is included.

公开(公告)号：DE4224744A1

公开(公告)日：1994-02-03

申请号：DE4224744

申请日：1992-07-27

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS DR ,  BRAENDLE HUBERT DR ,  FRUTH BERNHARD DR

IPC: G01B9/02 ,  G01D5/353 ,  G01H9/00 ,  G01V1/00 ,  H02B13/065 ,  G01V9/04 ,  G01B11/02

Abstract: The interferometer detects vibrations in the gas-insulated HV switchgear enclosure (3) caused by loose metallic particles moving in the alternate magnetic field in the equipment. Two branches (1, 2), of a fibre-optic Mach-Zehnder interferometer are driven by laser (4) and splitter (5). One fibre branch (1) is attached to a point of peak vibration on (3). The two branches (1, 2) are connected to via a combiner (6) to detectors (7). A control loop (8) is formed whereby a piezo-electric phase modulator (9) and a signal analyser (10) regulate the operating point of the system. Length variations in branch (1) cause a beat signal to be generated with branch (2) corresponding to the detected vibrations. ADVANTAGE - Wide bandwidth (several tens of MHz) of measurement, high sensitivity and immunity to electromagnetic interference.

公开(公告)号：DE19703128A1

公开(公告)日：1998-08-06

申请号：DE19703128

申请日：1997-01-29

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS DR ,  BRAENDLE HUBERT DR ,  SCHANKE TONE

IPC: G01R15/24 ,  G01R19/32

公开(公告)号：DE50014926D1

公开(公告)日：2008-03-13

申请号：DE50014926

申请日：2000-11-09

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS DR ,  BRAENDLE HUBERT DR ,  GABUS PHILIPPE

IPC: G02B6/27 ,  C03B37/15 ,  G02B6/10 ,  G02B6/255 ,  G02B6/34

公开(公告)号：DE19743658A1

公开(公告)日：1999-04-08

申请号：DE19743658

申请日：1997-10-02

Applicant: ABB RESEARCH LTD

Inventor： BOHNERT KLAUS DR ,  BRAENDLE HUBERT DR ,  GABUS PHILIPPE ,  KOSTOVIC JADRAN ,  TALIR JIRI

IPC: G01R15/24

Abstract: The spacers (5) are electrically conductive and contact adjacent sensor sections (2). The voltage sensor (1) high tension section is qualified for open air use. This derives from the high tension dielectric and protective screen (against weather) surrounding the assembly of sensor- and spacer sections. The sensor is made of individual sections, and a continuous sensor fiber (4a). In each section, a given length of optical fiber is fastened to the body (3) such that its length is varied only by E-field components parallel to the sensor axis. The amplification factor of each section is proportional to its length, in correspondence with the piezoelectrically-induced length variation of the fiber. Sensor sections and spacers are cylindrical and aligned along the sensor axis. Between sensors and spacers, there are conductive flexible holders (6). The holders include inner- and control electrodes, with spring sections. Inner electrodes bond and interlock with the end surfaces of sensor elements. Control electrodes are fastened onto the inner electrodes. Spring sections connect the inner electrodes to adjacent spacer sections. The dielectric is an elastomer or insulating fluid. The protecting screen is an elastomer with additional support insulator. The silicone body may have an additional fiberglass-reinforced plastic insulating rod. A version using a dielectric of transformer- or silicone oil is also described. The connection contacts (1a) of the high tension section comprise flanges, a hanger and a corona- and/or voltage control ring. An earthing and anchoring cable is included.