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If you thought an electrolytic in a set going 'pop' was bad...  

 
Cathovisor
(@cathovisor)
Famed V-Ratter Registered

...then take a look at what happened in this train.

www.gov.uk/government/publications/passenger-train-26-september-2019

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Posted : 10/01/2020 11:06 am
Nuvistor
(@nuvistor)
Famed V-Ratter Registered

Thank goodness the train was empty.

 

Frank

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Posted : 10/01/2020 1:15 pm
Lloyd
(@lloyd)
Noble V-Ratter Registered

Just how big was this capacitor?!

 Regards 

Lloyd 

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Posted : 10/01/2020 3:57 pm
Cathovisor
(@cathovisor)
Famed V-Ratter Registered

@lloyd

I think the issue is the gases given off under failure igniting - although a bit of me wonder what's sparking to ignite those gases.

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Posted : 10/01/2020 5:03 pm
Terry
(@terrykc)
Famed V-Ratter Rest in Peace

What sort of capacitor produces highly flammable gas?

When all else fails, read the instructions

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Posted : 11/01/2020 4:14 pm
Cathovisor
(@cathovisor)
Famed V-Ratter Registered

I've been wondering that myself...?

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Posted : 11/01/2020 4:32 pm
turretslug
(@turretslug)
Reputable V-Ratter Registered

I'm assuming that this was some form of oil-filled capacitor and wonder if it reflects the use of, say, refined and passivated mineral oils in some capacitors in the post-PCB era? PCBs have almost a dream-list of suitable characteristics as far as being a dielectric liquid in electrical components (notably high-voltage capacitors and transformers) is concerned, but they spoiled it with their insidious environmental poisoning effects. For some reason, the devil gets the best substances as well as the best music- asbestos, mercury, PCBs, CFCs, beryllia and leaded solder all have excellent technical characteristics but exhibit biological/environmental horridness in one way or another! I daresay that mineral capacitor oils are highly refined to achieve high molecular weight low volatility and low flammability characteristics and further tamed by clever chemistry, but if you put enough energy into them, you can probably get them or their vapour to burn in the end.

This report has details of another "exciting" capacitor failure;

https://www.gov.uk/maib-reports/safety-warning-issued-after-the-catastrophic-failure-of-capacitor-and-explosion-in-11kv-harmonic-filter-on-cruise-ship-rms-queen-mary-2

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Posted : 11/01/2020 6:05 pm
Doz
 Doz
(@doz)
Noble V-Ratter Registered

This is a good-un too ... https://assets.publishing.service.gov.uk/media/547c6fa6ed915d4c10000031/QM2Report.pdf

 

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Posted : 13/01/2020 4:17 pm
Katie Bush
(@katie-bush)
Famed V-Ratter Moderator
Posted by: @cathovisor

...then take a look at what happened in this train.

www.gov.uk/government/publications/passenger-train-26-september-2019

Hmm, Should have reformed it first - with a pretty big variac at that?!

 

If it ain't fixed, don't break it!............

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Posted : 22/02/2020 12:53 pm