substation vandals
substation vandals
(OP)
Anyone have a transformer bushing shot? If so, what occured? Damage beyond the wounded bushing? Fault and outage? Thanks.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: substation vandals
Problems down the road are tracking and bushing failure in severe cases.
JTK
RE: substation vandals
RE: substation vandals
I have seen more outages from line insulators being shot than substations. Most subs have outages caused by animals that I have worked with. Nothing like the smell of fried raccoon in the morning...
JTK
RE: substation vandals
RE: substation vandals
A lot of people are really bad shots as well.
JTK
RE: substation vandals
Have not seen such a case - but hopefully such a shot will totally miss the transformer. I think I would rather prefer a damaged bushing than a few holes in the transformer body.
Regards
Ralph
Failure seldom stops us, it is the fear for failure that stops us - Jack Lemmon
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RE: substation vandals
JTK
RE: substation vandals
RE: substation vandals
RE: substation vandals
I am sure most big game rifles (.303, .308, .3006, etc) which are very ordinary here (South Africa) will at least penetrate into the first wall of the transformer. Also, the transformers of today have mush thinner metal sheets than the older transformers, meaning penetration will be much easier.
Oil containment or not - it is beter to replace a bushing and top a few litres of oil up, than to patch a hole/holes at the bottom and totally refill the transformer.
Wfowfo
Radiators or not, hole/holes in the bottom of the transformer = spilled oil.
Regards
Ralph
Failure seldom stops us, it is the fear for failure that stops us - Jack Lemmon
Make the best use of Eng-Tips.com
Read the Site Policies at FAQ731-376
RE: substation vandals
RE: substation vandals
Also HV instrument transformers shot in the tank. Again the oil drains out and then you have a flying procelain safety issue. Unfortunately these events aren't instantaneous, they take time for the oil to drain, and hence the "perp" (perpetrator for those not used to the police vernacular) is long gone. The investigation of the failure only recognised the bullet hole and hence the bullet in the sand filled tank some days later. Bullets are not high on the list of common failure modes.
The first incident mentioned above would be a perfect situation to get Grissolm and the CSI team to investigate, you can work out the angle of entry of the bullet, get your laser pointer and identify the balcony from which the bullet was shot - case closed.
I'm not sure of the extent of the original post, but I would certainly be replacing the bushings if they were shot, unless it is clear that the damage is purely to the porcelain surface. If it is an oil filled bushing (or gas filled for that matter) you cannot be sure of what damage that the force of the bullet hitting it has had on the seals, and hence possible leaks can occur, resulting in an unsavoury failure.