DETERIORATION DIAGNOSIS METHOD OF LOW VOLTAGE CABLE

Title:

DETERIORATION DIAGNOSIS METHOD OF LOW VOLTAGE CABLE

Document Type and Number:

Japanese Patent JP2007047013

Kind Code:

A

Abstract:

To provide a deterioration diagnosis method of a low voltage cable capable of determining the deterioration state such as crack occurring of the low voltage cable simply and accurately in a short time.

In this deterioration diagnosis method of the low voltage cable, an insulation resistance change just after application start is measured by applying a direct-current voltage to the low voltage cable 1, and it is determined that deterioration occurs when a discharge pulsation rate defined by a following expression exceeds 1%: the discharge pulsation rate=(the maximal value of the insulation resistance-the minimal value of the insulation resistance)/the maximal value of the insulation resistance. Preferably the direct-current voltage to be applied is 500V or higher, and preferably the insulation resistance change is measured within a range of 20-60 seconds after start of voltage application.

Inventors:

GOTO TOSHIHIKO
EHAMA AKIHIKO
CHIYUUSU RYUJI

Application Number:

JP2005231583A

Publication Date:

February 22, 2007

Filing Date:

August 10, 2005

Export Citation:

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Assignee:

NIPPON STEEL CORP

International Classes:

G01R31/12; G01R31/00

Domestic Patent References:

JPS6161069A	1986-03-28
JPS5746168A	1982-03-16
JP2005017086A	2005-01-20
JP2001021608A	2001-01-26

Attorney, Agent or Firm:

Tatsuo Watanuki
Fumio Yamamoto

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