| 摘要 |
PROBLEM TO BE SOLVED: To provide a deterioration diagnostic method of a power cable, which diagnose the deterioration of the power cable by applying such a sealed type device of a gas insulated switchgear or the like as a power charging terminal using a loss current method, capable of precisely diagnosing the deterioration of the power cable dispensing with sealing and unsealing working of the sealed device. SOLUTION: The ground side of a ES terminal part 21 in a gas insulated switchgear 1 is connected with a diagnostic device 3, and is connected with a dummy cable 5. By applying a voltage from the diagnostic device 3 to the power cable 1 through the ES terminal part 21 after closing the ES terminal part 21, the first deterioration signal is measured. Then, by applying a voltage to the ES terminal part 21 and a dummy cable 5 after opening the ES terminal part 21, the second deterioration signal is measured. Using the signal obtained by reducing the second deterioration signal from the first deterioration signal, the deterioration of the power cable 1 is diagnosed. COPYRIGHT: (C)2008,JPO&INPIT
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