Ray(RODALCO),
I've got a problem with a sub-station that just won't go away!.
Earlier on in the week, the Hinds Sub was hit directly with a lightning strike, through a spike above the highest point in the sub-station.
It blew out a Gaseous Surge Diverter.
I replaced that upon finding it was blown.
I took out all of the ABS's and had a good look at the switchgear and what have you, it didn't seem to be damaged at all.
Went to put back in AH 36 and there was an almighty bang from the DDO's on the load side of the sub.
One DDO dropped, I meggered the tranny and it checked out OK.
I hence put it down to an old fuse link.
On Wednesday, the whole thing gave up the ghost knocking out most of Ashburton.
I got down there and saw the 3 of the DDO's dropped, I opened the ABS and replaced the fuses and had another go, they stayed closed until Friday night.
Ray,
Do you have any idea what could be wrong here?.
I should mention that 2 of the upstream feeds are locked out by me because of Earth Faults that we haven't the staff to fix.
Besides, this is not an overcurrent problem, it's short circuit current.
