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4hv.org :: Forums :: High Voltage
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550 uF, 1.5 kV capacitor

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Physikfan
Wed Apr 05 2017, 03:42PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
This 550 uF, 1.5 kV capacitor is also a real heavyweight:

500uF2trim127x400
500uF1trim569x400

The energy when charging with 1.5 kV is:

Ec = 0.5 * 550 * (10 ** - 6) * (1500) ** 2 = 225 * (10 ** - 6) * 2.25 * (10 ** 6) = 506 Ws.

At the same time, this is roughly equivalent to the kinetic energy of a mass of 10 kg after a free fall of 5 m height at the time of the impact.

Comparing this with the energy of the 10 nF 200kV capacitor:
Ec = 0.5 * (10 ** - 8) * (200,000) ** 2 = 0.5 * (10 ** - 8) * 4 * (10 ** 10) = 200 Ws

It can be seen that, due to the small capacity of the latter (comparison: 10/550 000), the energy is about one-half smaller despite the high voltage (comparison: 200 / 1.5).
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Enceladus
Tue Apr 18 2017, 08:24AM
Enceladus Registered Member #61428 Joined: Sat Jan 14 2017, 12:39PM
Location:
Posts: 50
Do actually own this behemoth? She looks like a real firecracker for sure. Where did it come from?
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Proud Mary
Tue Apr 18 2017, 10:15AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I see that there is not a shorting bar across the terminals and wonder what surprises such a monumental capacitor might have in the way of dielectric absorption/residual charge?
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Physikfan
Tue Apr 18 2017, 04:29PM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
This capacitor was used in an ultimately unsuccessful experiment.
After many years I could save this capacitor from being scrapped.
I will attach a shortcut to this capacitor as soon as possible.
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Conundrum
Wed Apr 19 2017, 09:39AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
I have a 215uF 2.5KV here.
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Physikfan
Wed Apr 19 2017, 09:47AM
Physikfan Registered Member #60240 Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Please, could you show us this capacitor?
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Mads Barnkob
Sat Apr 29 2017, 07:32AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I got a Maxwell 1.8 kV, 2500 uF energy discharge capacitor, properly not meant for hard short circuits as I use it for: Link2
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