Title:
【発明の名称】ケーブル内の部分放電を測定するための方法及び装置
Document Type and Number:
Japanese Patent JPH08503297
Kind Code:
A
Abstract:
PCT No. PCT/NL93/00232 Sec. 371 Date Jun. 12, 1995 Sec. 102(e) Date Jun. 12, 1995 PCT Filed Nov. 5, 1993 PCT Pub. No. WO94/10579 PCT Pub. Date May 11, 1994The invention relates to a method for detecting partial discharges occurring in a cable, wherein the cable has an earth screen with a helical structure, comprising the following steps of: arranging at least one detection coil round the cable for detecting electromagnetic pulses travelling along the cable; applying a potential difference between the core and the earth shield of the cable; and analyzing pulses generated by possible partial discharges in the at least one detection coil in order to determine the location and quality of the partial discharge having caused the pulse, wherein the detection coil is adapted to process signals with a frequency higher than 100 MHz. It has been found that with coils comprising only such a limited number of turns the signal detected by the coil is a much better representation of the form of the electromagnetic pulse travelling along the cable.
Inventors:
Stanis, Ebert Frederick
Application Number:
JP51091894A
Publication Date:
April 09, 1996
Filing Date:
November 05, 1993
Export Citation:
Assignee:
N.V. Kema
International Classes:
G01R15/18; G01R29/00; G01R31/08; G01R31/12; (IPC1-7): G01R31/08; G01R29/00; G01R31/12
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)