Static Excitation Pt. 4: Regulator Analysis Part 2

[n1mr0d]

Hi,

I simplified things a bit more since my last. I removed T1, which in my view only provides 3 more phases.

An SCT/PPT application note from Basler says the following:

"The power current transformers were inserted into the
generator output via the neutral side of the machine one
for each phase. The power current transformers included a
control winding in which dc current could be applied to
affect magnetic saturation. The secondaries of the power
current transformers were delta connected and in parallel
with a set of linear reactors connected in series with
the delta secondaries of the power potential transformer.
While the primary of the power transformer was connected
in a wye across the generator output. The combined output
of the SCT and PPT was connected to a three phase power
diode rectifier bridge that connected to the generator
field. The phasor summation between the PPT/linear
reactor set and SCT provided the correct compensated
voltage and current to the generator field for all types of load at any power factor."

...This applies to my circuit almost perfectly, except that the CT isn't saturable.

Can someone describe in mathematical terms how the circuit works? Especially the counteraction between the reactor and the current transformer.

 

[powerjunx]

n1mr0d,

I encounter this system on marine crafts, usually a japanese ships power generator which built late 60's (pretty old). I hardly recall to find the schematic diagram to match with yours that was 7 ago, though i can not give you specific details on mathematical aspects but i think i can give you some extra inputs.

How old your system by the way?
Are you working on it, like troubleshooting, etc?