Open Delta Conection of Voltage Regulators

276

04:08:07

Voltage Regulators basically is autotransformers that regulate the voltage in medium voltage power lines by boosting or bucking the voltage.
Three single phase voltage regulators can connect in either wye or delta conection in a three phase system.
Specifically in delta conection we can connect the voltage regulators in closed delta or open delta conection.

In closed delta we use three single phase regulators in an ordinary delta conection.
The amazing thing is that we can use just two single phase regulators in open delta conection and have symmetrically voltage raise or decrease in all three phases...!!!

The 1:1 three phase transformer in the circuit is just used in order to have a ground reference point so that we can plot the voltages, because we cannot ground both the source and load in a line that have voltage regulators in open delta conection.

The example shows a voltage drop compensation that is caused from the resistance and reactance of the line.

published 10 years ago

Daryes

10 years ago

Niceee

rich11292000

10 years ago

Is that proper grounding of the secondaries even though you have 1:1 transformer? My interpretation is that you must directly ground the secondary so it has a 'zero' reference point. With out this you will end up with proper line to line voltage, but line to ground can end up 1000s of volts off, which is no good after step down to utilized voltage of 240 volts line to line and 1000 volts line to ground. Sure the coffee pot gets its 120 volts, but it will be a 1000 volt bus bar that shocks you from two feet away.

rich11292000

10 years ago

Ground the secondary with a center tap, or directly ground a phase. Grounding after a load will cause the reference point to move around.

rich11292000

10 years ago

Note the simulator directly connects a ground to all other grounds with no resistance and current flows into the ground. In real life there is no current flow between the grounds even though they are 'earthed'. To work past this separate the grounded side of the source by having a ground and a neutral. Use the neutral for current flow. Use the ground for a zero reference point. I use a capacitor to isolate the neutral from the ground.

Zafeirakis

10 years ago

That circuit it's just a proof of concept...

GuyHardy

8 years ago

This is a good example circuit. By the way, if things were that bad the potentials spoken of would never make it to the coffee pot to shock anyone.

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