This article arises node grouping diagnosis based on Chwa&Hakimi fault model and defines absolute fault sets and finally diagnosis chart, on which all the consistent fault patterns (CFP) can be found.

This paper presents the theory of node grouping algorithms for the systemlevel fault diagnosis of the BGM model based on mutual testing, defines the absolute fault and last diagnosis chart, so all the consistent fault patterns (CFP) can be found, even if the condition of tdiagnosability is not satisfied.

Owing to the fuzzy and complicated relationship between the insulation faults and the corresponding symptoms of a large generator, it is a tough job to diagnose its insulation faults with an accurate method.

Cable insulation fault occurs frequently.

A novel method on synthetic diagnosis for insulation fault of power transformer is put forward, in which the effective information from electrical tests and analysis result of the dissolved gas in the oil can be fully utilized.

As the first phenomenon of many faults of the submarine optical fiber cable is insulation fault, we design an on-line supervision system using ADuC812, which is a new type of micro converter of AD, to supervise the insulation status of the submarine optical fiber cable and capture faults in time.

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