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Title:
METHOD FOR DIAGNOSING INSULATION DETERIORATION OF POWER CABLE
Document Type and Number:
Japanese Patent JP3294220
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To make executable the insulation diagnosis of a CV cable whose cable line is long such as a 22 kVCV cable (crosslinked polyethylene insulating power cable).
SOLUTION: A DC voltage is impressed to the conductor of a CV cable, and a changing curve a expressing DC leakage currents Id running through an insulating layer is obtained. Also, a smooth monotone attenuation function f(t) is calculated based on the changing curve α. The fluctuating components of the DC leakage currents Id whose current values are changing in a relatively long period being a difference between the changing curve α and the monotone attenuation function f(t) are observed. The insulation deterioration of the CV cable is diagnosed based on the fluctuating components.


Inventors:
Koizumi, Satoru
Ueno, Masafumi
Sakamoto, Ataru
Otaka, Iwao
Sato, Nobuhiko
Application Number:
JP1999000189984
Publication Date:
June 24, 2002
Filing Date:
July 05, 1999
Export Citation:
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Assignee:
TOKYO ELECTRIC POWER CO INC:THE
MITSUBISHI CABLE IND LTD
International Classes:
G01R31/12; (IPC1-7): G01R31/12
Attorney, Agent or Firm:
小山 武男 (外1名)