Electronics > Projects, Designs, and Technical Stuff
36V Soft start
james_s:
I solved a similar problem with inrush in the primary of a very large power transfromer that was frequently tripping the breaker when we turned it on. I found a big old power resistor and wired a contactor across to bypass it, but instead of a time delay circuit I simply wired the contactor coil across the primary of the transformer. As soon as the core magnetizes enough for the current to fall and allow the voltage to rise the contactor closes and bypasses the resistor. In practice this happens almost instantaneously.
ocset:
..yes we had that inrush problem too and i think that inrush is caused by the residual magnetism in the core being left with a certain polarity such that when turned back on there's inrush.
Anyway, in this case, RC timer followed by switch out of inrush resistor sounds best in this case, would Scroz like a circuit?, if so ill send one in (or others will b4 me)
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