HV gone wrong....!

DurhamSparky · Jun 27, 2012

Why HV is bad and should be treat with the respect it deserves...!!!

this happened today at work! routine switching (autiomatic via a plc) on the generator test!

the HV unit that has "broke" looks like it tried to close onto a un-synced bus bar from the generator side... possibly a unit defet or possibly a PLC sequence problem.... the investigation starts tomorrow!!!

luckily no body was hurt in this instance!

Guest55 · Jun 27, 2012

It should buff out with t-cut.
;-D

Guest55 · Jun 27, 2012

What voltage out of interest 11kv ?

DurhamSparky · Jun 27, 2012

11kv........ took out all protection at the site sub!!!

Knobhead · Jun 27, 2012

Last time I had an episode like that, I had to chisel bits of porcelain insulator out of the brick wall!

Guest55 · Jun 27, 2012

I envy you with such interesting work , would love to try some distribution fitting out.

theroadblock · Jun 27, 2012

DurhamSparky said:
11kv........ took out all protection at the site sub!!!

Ouch! lol, looking at that reminds me of the time my boss was showing me how the incomer to our switchroom is turned back on in the case that it trips, in his attempt to show me he forgot that upon inserting an interlock handle he activated a limitswitch in the mechanism... power shut off to the whole site! hahahahaha during production hours as well! he wasnt very popular :rofl:

Knobhead · Jun 27, 2012

Been there, done that and got the tee shirt.

Plonker 3 · Jun 27, 2012

Tony said:
Been there, done that and got the brown pants.

Corrected that for you.

Knobhead · Jun 28, 2012

Can’t say it bothered me. I must have done it dozens of times. Nobody ever said anything

DurhamSparky · Jun 28, 2012

Turning off hv by mistake is funny, it's just not funny when it goes bang turning it back on.... Unlike lv you can't just go oh ****!!! and remake it fast as... Lol

Engineer54 · Jun 28, 2012

Never had a problem on any of our MV panels (feverishly touching wood..lol!!) only ever seen the aftermath of faults on somebody else's panels. And i wouldn't have liked to have been in close proximity when they did go Bang!! lol!!

Durham, please explain what i'm looking at in Photo 2?? What is that un-shrunk heat shrink doing there and what is protruding through it?? Do you not use termination filler and boots on your terminated cables within your panels?? The centre connection termination bolt is too long, and even more reason for filler and boots to have been used.... One more question, ...what is the material that these single core MV cables are entry connected too and pass through??

Knobhead · Jun 29, 2012

DurhamSparky said:
Turning off hv by mistake is funny, it's just not funny when it goes bang turning it back on.... Unlike lv you can't just go oh ****!!! and remake it fast as... Lol

One reason I liked some of the old breakers. You could tie a lanyard to the closing loop, retire to a safe distance and pull.
Wouldn’t like to have been around when this went

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Bobster · Jun 29, 2012

Tony said:
One reason I liked some of the old breakers. You could tie a lanyard to the closing loop, retire to a safe distance and pull.
Wouldn’t like to have been around when this went

View attachment 13228

We still use similar ocbs on quite a few sites. Must admit I do the same thing tie a length of blue rope to the closing pin.

1shortcircuit · Jun 29, 2012

I admire you men that work with such a lethal beast.... This boy is staying with domestic because at least if I make a mistake a may live to tell the tale.

Fascinating stuff but way beyond a point I would ever feel comfortable with.

Great post Durham, thanks for sharing :thumbsup