# 18 pulse

Discussion in 'Electronic Design' started by Bob LaFrance, Jul 28, 2003.

1. ### Bob LaFranceGuest

I need to model 18 pulse rectifier system. I already have 3 of the
vectors, 0, 120, 240. How do I create the remaining vectors so that
they mimic the manner in which an 18 pulse transformer will be wound?

73
Bob

2. ### Jim MeyerGuest

Put center-taps on the phases you already have. That way you can
get phases 180 degrees from the first ones. 0, 60, 120, 180, 240, and
300. This is a 6 pulse system.

If the first transformer was delta wound, add another with wye
windings or vice-versa. That will get you phases 30 degrees off from
the first winding. That will give you 12 pulses.

tapped at 1/3 and 2/3 between adjacent phases (0 and 60 for instance).
The taps will give you 10 degree phases intermediate to the phases on
the ends of the inductor.

Jim

Jim

3. ### John LarkinGuest

You can make any phase angle from vector sums of what you have, using
resistive mixers and VCVS elements... that's just trig. The tricky
part, from a modeling standpoint, will be to poke in the proper source
impedances to mimic the real transformer. Maybe the tranny
manufacturer can suggest some values.

John