FAULT POINT LOCATOR AND LOCATING METHOD OF GAS INSULATED SWITCHGEAR

摘要

PROBLEM TO BE SOLVED: To solve the matter of a fault point locator applied to a gas insulated switchgear that judgment is difficult when pressure rise is small at the time of failure because impact of pressure variation of external world is large.

SOLUTION: A pressure sensor 5 provided in a gas insulated switchgear 1 detects internal gas pressure and a fault point locator 20 locates a failure portion in combination with the information of a protective relay 12. Index 1 which is the difference between the current pressure and the pressure at a predetermined time before, index 2 which is the difference of an integrated value using the differentiated amount of pressure, and index 3 which is the sudden change rate of the differentiated amount of pressure are determined and combined with the information of the protective relay in order to judge existence of failure. When any two or more indices are satisfied, location of a failure section is determined. When there is a plurality of location determination sections, they are handled as candidate sections.

COPYRIGHT: (C)2007,JPO&INPIT