 Other means of power control
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Proud Mary
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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
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"Other means of power control:"
Mercury vapour/mercury argon/mercury xenon thyratrons performed most of the functions of SCRs until the close of the Thermionic Age, and deserve mention as an historical curiousity.
Hydrogen thyratrons are still used in ultrafast HV power switching applications.
Other types of gas switches in current use are trigatrons, krytrons, sprytrons, and pseudospark devices.
And then there are solid dielectric single shot gaps used for switching in the MW regime.
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radiotech
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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
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The advantage to to the saturable reactor is they are battleship
tough and foolproof-even if you burn them out you can rebuild them. On another thread I posted a picture of one from a battery charging system. Our 100kW Cotrell precip transformers with 600 volt
primary were controlled by a saturable reactor in series . The card
that furnished the DC and interfaced to instrumentation was SCR
based. The cards did fry from time to time. Without the card, you can still regulate the transformer with a DC voltage. However not advised since those machines are controlled by measuring "sparks per minute" detected on the low side of the rectifier stack.
Good luck in googling for IEEE papers of about 50 years ago
on core design.
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