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You are going to need to provide much, much more information. How much voltage? How much current? Tap changing motor? Do you mean a transformer with a motor driven variac? Taps on large transformers are generally changed manually based on line voltages to get desired outputs. Variable systems are usually motor driven variacs with reversible DC or AC motors. You raelly aren't providing much information? Also single or poly phase?
Ron
I haven't seen any 132,000 volt variacs. Where do you get those?
Do you have the specs on the "I meant dc motor driven variac"??
Hello there,
Sounds like a servo system to me. Measure output, use that to determine direction of motor. H bridge to drive motor.
Is that transformer designed for on load tap changing ?
Large 10, 20, 50 MVA substation TX's with TCOL usually have the electric tapchanger bolted on and switch under load by means of double contacts from which one has a heavy resistor in series to avoid parralleling 2 windings at the same time.
A 110 Volt VT usually drives the voltage regulator. An ac motor with heavy flywheel does the change over, which only does so, when up to speed and the flywheels kinetic energy can do the complete tapchange in one go avoiding the tap getting stuck between two taps.
As your TX has 17 taps which is the normel industry norm.
please take a photo of the nameplate.
Sorry to ask, what do you mean by normel industry norm?
You might build in a little hysteresis to prevent the system from constantly hopping back and forth between two levels.