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Patent Searching and Data


Title:
FAULT LOCATOR AND GAS INSULATED SWITCHGEAR USING THE LOCATOR
Document Type and Number:
Japanese Patent JP2002191105
Kind Code:
A
Abstract:

To provide a simple, low-cost fault locator for a gas insulated electric apparatus.

A piezoelectric element sensor 9 arranged in a gas division of the gas insulated electric apparatus outputs a voltage caused by an internal fault. This output voltage is filtered by a low-pass filter 15 in the fault locator 13. By excluding high-frequency oscillation arising from factors other than a failure, low-frequency oscillation is extracted and inputted into a discriminating part 17, which discriminates that a failure occurred in a gas division where the level of the low-frequency has exceeded a given value. The discriminating part is capable of performing a more precise discrimination by referring to signals prior to a filtering process, signals of a protective relay, and operating signals of a breaker. In this invention, the use of the piezoelectric element that requires no power supply enables to make the structure of the fault locator simple and low cost.


Inventors:
SONODA TOSHIO
TAKEUCHI YASUO
OKI HIDETO
TAKEI HIROKAZU
OKADA NAOKI
TAKADA KEIICHIRO
KURATA NORIMITSU
SAITO MUNECHIKA
Application Number:
JP2000000385843
Publication Date:
July 05, 2002
Filing Date:
December 19, 2000
Export Citation:
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Assignee:
KANSAI ELECTRIC POWER CO
NISSIN ELECTRIC CO LTD
International Classes:
G01R15/14; G01R31/08; H01H33/56; H02B13/025; H02B13/065; H02G5/06; H02H5/00; (IPC1-7): H02B13/065; G01R15/14; G01R31/08; H01H33/56; H02B13/025; H02G5/06; H02H5/00
Attorney, Agent or Firm:
石田 敬 (外2名)