发明名称 |
DIAGNOSTIC METHOD AND DIAGNOSTIC DEVICE FOR DETERIORATION OF HIGH-VOLTAGE POWER CABLE |
摘要 |
PROBLEM TO BE SOLVED: To provide a method for diagnosing a deteriorated condition of a high-voltage power cable by detecting a weak higher-harmonic current caused by water tree deterioration. SOLUTION: This diagnostic method has: a physical quantity detecting means 2 for obtaining a physical quantity correlated with a zero-phase current superposed with the higher-harmonic current flowing through the high-tension power cable 1 in three-phase collective current measurement; a zero-phase current component removing means 3 for removing a component correlated with a zero-phase current flowing through the high-tension power cable 1 out of the physical quantities obtained by the physical quantity detecting means 2; and a current measuring means 4 for finding the higher-harmonic current flowing through the high-tension power cable 1, based on the physical quantity from which the component correlated with the zero-phase current flowing through the high-tension power cable 1 is removed by the zero-phase current component removing means 3. COPYRIGHT: (C)2007,JPO&INPIT
|
申请公布号 |
JP2007205992(A) |
申请公布日期 |
2007.08.16 |
申请号 |
JP20060027395 |
申请日期 |
2006.02.03 |
申请人 |
CENTRAL RES INST OF ELECTRIC POWER IND;HOKKAIDO ELECTRIC POWER CO INC:THE;TOHOKU ELECTRIC POWER CO INC;HOKURIKU ELECTRIC POWER CO INC:THE;CHUGOKU ELECTRIC POWER CO INC:THE;SHIKOKU ELECTRIC POWER CO INC |
发明人 |
TAKAHASHI TSUGUHIRO;OKAMOTO TATSUKI |
分类号 |
G01R31/12;G01R31/02 |
主分类号 |
G01R31/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|