Oil Leakage

Nope, not at all. The last partial sentence I can only imagine was snuck in, (English, sneaked in; American), when I went to the post button in preview. And low and behold, I never noticed it when I proof read it. I obviously had my eyes wide shut. And the insert was totally unrelated to the posting. And I had attached a link to SF₆ handling, That never showed up either on the post. It will now.

It might be handy for someone. Who knows?

http://infohouse.p2ric.org/ref/22/21612.pdf

It appears the major hazards chemically are (1) suffocation due to heavy gas accumulation in a low lying area, (2) direct exposure to arc products where the gas was confined in the space where the arcing took place. This could break the gas down to a wider range of compounds, possibly including F₂ gas which is very toxic.

It is also a green house gas.

quote: According to the Intergovernmental Panel on Climate Change, SF
6 is the most potent greenhouse gas that it has evaluated, with a global warming potential of 23,900^[20] times that of CO
2 when compared over a 100-year period. Measurements of SF₆ show that its global average mixing ratio has increased by about 0.2 ppt (parts per trillion) per year to over 7 ppt.^[21] Sulfur hexafluoride is also extremely long-lived, is inert in the troposphere and stratosphere and has an estimated atmospheric lifetime of 800–3200 years.

Yeah, not great for the environment as to its lifetime in the atmosphere.

A lovely 1901 invention that is great for electrical applications, until it goes wrong and it is always the O rings and seals that perish, and then it goes wrong big time. And an oil leak is far easier to detect than a gas leak. No dust sticks to a gas leak and there is no telltale drips or runs. Oil has an advantage here.

And an oil leak is far easier to detect than a gas leak

Actually modern SF6 gas switchgear (well the good quality stuff) has built-in pressure monitoring devices allowing pressure monitoring (either by gas gauge or remote contact back to the control room) for utility piece of mind.

Its only the cheap, sh*it quality SF6 gear that actually leaks SF6. Modern SF6 switchgear, properly designed and built will not leak over its lifetime. Unfortunately its the cheap, sh*it that has resulted in increased network-wide bans of SF6 switchgear.

True that. I fail to understand the ethics of any company that would build such crap.

Rolls Royce has ethics, they just posted a loss of £4b because their 'ethics' were to bribe for business but they made good crap for aeroplanes.

Ethics are for Joe Public only. Dont be fooled, it is all false with companies and banks. Look up Bundesbank and their ethics. Guess who has been money laundering because they are ethically bankrupt. Hmmm!

It all comes down to cost. An example, one poor utility down here brought really cheap pole top transformers. The bushing seals leaked and destroyed them requiring them to be pulled from the network. About 60% of those installed failed within 2 years, they pulled the whole lot after that.

It's quite common and makes it very hard to sell a new quality product to a utility when their yard is filled with multiple examples of tried and failed junk they blew their budget on.

I worked in Ethiopia recently, all Indian gear and it is so bad they cannot trip breakers and re-energise them. They have no spares and but yards full of equipment that is useless. The last sub I worked in the breaker was tripped and enegised with a broom stick, and on tensioning an OPGW, the next day we found the tower peak totally bent.

I will spot a leaking Tfx quicker than finding a low pressure as the pressure is slow, unless of course there is a major leak of SF6 then you have a total shut down and you will know about it. With oil it always weeps, leaves a puddle, will always have contamination of dust on the leak. The gear still operates and it is easy to spot a leak.

I agree the SF6 is fine on the 'quality equipment', and trust me, even the quality equipment is infested with poor quality items. Look up ABB equipment and select where you want to buy it from, then check the pricing and lead times. You might get a shock.

I am aware of ABB and their quality problems (at least their Chinese-made transformers). Numerous other big name manufacturers which in general have good quality product ranges have a lot of poor quality junk mixed in with it I have had to in some way deal with.

The Indian stuff is also cheap but poor ow cost quality at high price for the name. But the make good quality HVDC Tfx and HVDC valves and insulators in Sweden in a little town called Ludvika. But it is pricey.

What I should have said is: an oil leak is easier and quicker to spot as the leak is instantaneous and leaves a trace, where a gas leak can be slow and difficult to locate. A slight down pressure from 0.5MPa won't show much, but a loss of .5ltr of oil will show quickly on any Tfx and .5 ltr on 1000ltrs will not damage the Tfx and it can be found easily. Finding a gas leak is and can be a nightmare in time to find.

The normal leakage on SF6 is around 0.3-0.5% per year. From what I can recall.

Fortunately SF6 is heavier than air so most of a leak will hug the Earth. Like pollen and spores though, it doesn't take much turbulence to carry it aloft.

Good catch on my faux pas about pressurizing an oil transformer with SF6. I guess that SF6 could be used to pressurize but anhydrous N2 is much cheaper.

Off the record, no hassle at all. I don't do things to have a dig at anyone. I just write abruptly and say what is on my mind. I am told I have the tact and subtleness of a sledge hammer.

Besides, we all screw up at times and simply forget to look or recheck. As they say, 'I see the screw-up fairy has visited again'.

Theft! Someone stole the glass.

Amazingly, I see folks photographing their lunches, cups of coffee, biscuits, deserts and yet, never a photo of the item they ask for help on. Someone explain to me the logic and how that works.

Hey guys, I am eating this yummy cake at a fancy restaurant while my switchgear is blowing up back at the sub, disrupting the electrical supply to thousands of homes and factories. The cream is so fresh.MMMM!

_{Sent from my iCell}

Yeahhhh, in most cases where data is very low or lacking entirely, the OP's really can barely grasp the English language, so they most likely have no idea how to post a picture. That requires reading instructions in English.

Kei! I'm from Barcelona, I know notheeng!

https://www.youtube.com/watch?v=H-oH-TELcLE

Monty Python - I may need a translator for that English as well. There is English, and there is the "Americanized" version which I speak. Very similar concept to the "Africanized " bee. When it has an "ized" on it, it has really been modified, and not for the better.

Ola, that was essentially offensive to every Spanish speaker out there, sort of. However, I find a bit of offense in the morning with my butter and roll a good offset to the coffee.

On an entire different subject, where did you learn to speak English?

Nope. It is outside humming a tune!