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SF6 insulated load switch 66 kv gis switchgear Analysis factorys

Analysis of VFTO during the failure of a 550-kV gas ... oscillograph of the protection system exhibited a single-phase short circuit in phase B of bay 2. After review of the plant supervision system event log, it was determined that the 550-kV GIS failure occurred during the closing operation of the breaker isolation switch (DS-4), shown in the single line diagram ().The event log also showed that there was a closure, followed by the opening of ...

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