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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I were demonstrating my VTTC and MOC bank on the 23th December at my work and one of the questions about the MOC bank was the short circuit current as we work with short circuit currents in the supplies and control panels we make at my work, so the amount of energy in joule it contains was not relate able to the daily work.
I am aware that people have said to not even bother calculating this with MOCs etc, but want to give it a try using information found around in our community.
Steve ward measured/calculated a MOCs ESL to 180nH
Terry fritz wrote a reply on the pupman list about ESR/ESL
My MOC bank is charged with 6000VDC on the 18,5uF. Resistance in the leads and paralling is about 5 ohms, stray inductance... no idea.
Does this sound reasonable for a 333j bank of MOCs? Did I forget something important, or are these results just too far from the real world as its guessed numbers and perfect/no-loss calculations to used for anything?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
It doesn't sound unrealistic, but you should measure the actual current as the stray inductance in the leads will probably be over 100nH, which will at least double the inductance you've counted on. If you have/borrow a storage scope you can capture the waveform with a Rogowski coil.
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MOC bank shortcircuit current
