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crowbar arrester

crowbar arrester

crowbar arrester

(OP)
What is a crowbar arrester?  Sounds like something for electronic circuits, but I suspect someone else have changed the meaning.

RE: crowbar arrester

Usually, it is for electronic circuits. Very often used in linear power supplies to short the output when voltage got too high and thus tripping fuse or similar. Usually a zener and a thyristor that was gated on when voltage increased above zener voltage.

Same technique is used in high-power circuits, too. Especially in VFDs with GTOs, where one must keep DC link voltage below the limit where GTOs cannot be turned off reliably.

Such a crowbar overvoltage protection is built the same way, only with a little more sophisticated limit sensing and triggering. When an overvoltage is detected, it shorts out the DC link and blows the DC link fuse. The action is called "Schutzkurzschluss" or "protective short".

I guess that the same technique can be used in other applications, unknown to me.

Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: crowbar arrester

(OP)
Thanks, Bill.  The station class arrester concept in the link looks like a pretty clever idea!

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