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Reclosing of Covered Conductor

Reclosing of Covered Conductor

Reclosing of Covered Conductor

(OP)
I would like to know if anybody have experience with the Covered Conductor (CC)installation at 34.5 kV distribtion system.  CC is the more general term use to call conductors with partial insulation covering, usually with XLPE with or without UV protected HDPE, that can withstand transient interruptions due to intermittent touching of phases, trees and other grounded objects.  In Europe, they are called as SAX, PAS, BLX, etc...In the US, it is commonly known as the tree wire or spacer cables.

Our reclosing practice for bare wire installation whenever fault occurs is 2sec (1st shot), 15 secs (2nd), then lock-out.  For CC, we have the recloser at off position.  Meaning, we do not reclose because we assume that no transient fault would occur on such installation (as it is its purpose).

However, undetermined faults occurred on some of our pilot circuit installation.  Perhaps due to some degradation already in the covering of the conductor particularly in some vegetated areas.  In this regard, we are considering applying the reclosing sequence for our bare wire to our CC installations.  This actually would benefit as in transient fault occurrence because shorter interruption will result.  Does anybody have the same experience?


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