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I have large voltage drop in domestic supply caused by 1km pwr cable run from the mains transformer.

When I try to run a one HP 220v AC water pump it overheats and when I put a multimeter across the pump terminals while it’s running the volage is 140v: unloaded voltage 215v. Would a voltage regulator remedy this or is ther another fix. VBR Bazzer.

Everyone is going to hate me for saying this, and there is some risk it wouldn’t work. You also need to have considerable technology sophistication to set it up and test it…

Assuming the wire is rated for 330VAC, a 1:1.5 or so step up transformer near the source would allow the motor to run properly. When running, the motor voltage would be about correct. However, when you turn if off, high voltage at the motor is unsafe and possible to kill motor. A compromise using maybe a 1:1.25 transformer would reduce power capability but also reduce risk.

A step further would be to feed the transformer with a intelligent 2HP single phase VFD capable of modulating the output voltage with feedback. A simple V/Hz controller may not be able to do that. The VFD could be programmed with a voltage limit used when the motor is running to fine tune the voltage at the motor. A current sensor at the VFD and/or transformer output would provide feedback to the VFD, or possibly another microcontroller to determine how much voltage to put out. Increase voltage to keep current at the nominal or the max allowed for your system (or the motor nameplate). However, when the current drops rapidly (motor shut off), the VFD needs to instantly revert to 220V out from the transformer. A feedback signal, perhaps a rectifier (at the pump) with a voltage divider and filter and a small wire running all the way back to the source would provide better feedback. You might also need a shut off switch that actuates when the pump turns off to tell the controller to quickly drop the voltage.

Of course, whatever you do, make sure a qualified engineer or tech verifies its OK. Be careful, and be safe!

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