公开(公告)号：JPH08271574A

公开(公告)日：1996-10-18

申请号：JP4331696

申请日：1996-02-29

Applicant: ABB MANAGEMENT AG

Inventor： NIKORASU DE KOTSUKU ,  INGO HERUPUSUTO

IPC: G01R1/067 ,  G01R1/07 ,  G01R29/00 ,  G01R31/12 ,  G01R31/327 ,  H01H9/50 ,  H02B13/045 ,  H02B13/065

Abstract: PROBLEM TO BE SOLVED: To obtain a compact and inexpensive discharge measuring instrument with a high measurement accuracy at UHF region by forming a flange protruding part in a trumpet shape between an opening and a flange carried by the flange protruding part and forming a first part of the external conductor of a shifting conduit on the inner surface. SOLUTION: A support body 11 is retained while it is electrically insulated by a metal cover 12 of a metal capsule which is place to a flange protruding part 4 in gaslight state. Inner and external conductors are coaxially placed at a shift pipe 8. The inner conductor is formed by the outer surface of the support body 11 and a circular plate 10 is connected to a shield conductor 14 of a measurement cable 7. The external conductor is formed mainly by the inner surface of the trumpet-shaped flange protruding part 4 at a first part and is thinner toward the tip in trumpet shape between the edge portion of an opening 5 and a flange 16 carried by the edge portion used to retain a flange cover 12. When a discharge occurs, an electromagnetic wave is generated in the metal capsule. The electromagnetic wave has a frequency band which is formed slightly stronger at UHF region in response to a high-voltage value reaching 1,000KV.