High Voltage Regulator

Thread Starter

Pyarisiba

Joined Apr 5, 2021
2
Hello I m trying to help farmers in our village whose motors are burnt with low voltage . Basically they have submersible.motors to pump water and the government is giving very less voltage either there are too many motor connections or too less voltage coming in from the power station it self. My question is can we build any circuit that would not start the motor if the voltage is less than 230 volts ac and if the voltages comes higher than 440 V AC. Please let me know how I can achieve this and save money for poor farmers who are wasting money on burnt motors. Thank you in advance.
 

Papabravo

Joined Feb 24, 2006
17,316
Hello I m trying to help farmers in our village whose motors are burnt with low voltage . Basically they have submersible.motors to pump water and the government is giving very less voltage either there are too many motor connections or too less voltage coming in from the power station it self. My question is can we build any circuit that would not start the motor if the voltage is less than 230 volts ac and if the voltages comes higher than 440 V AC. Please let me know how I can achieve this and save money for poor farmers who are wasting money on burnt motors. Thank you in advance.
I cannot think of anything that would be remotely useful or minimally affordable for dealing with those power levels.
If there will NEVER be a solution to government provided electricity distribution, then the alternative is to develop local electrical service via some combination of solar, batteries and generators.
For example, if the government provided electricity is capable of charging batteries, then running the pumps from charge batteries would be both reliable and predictable.
I think the solution to your problems need to cover a wider range of solutions. I don't foresee a single solution and I don't see any easy fixes.
Maybe somebody smarter than me has an idea(s) that could help.
 

Thread Starter

Pyarisiba

Joined Apr 5, 2021
2
Thank you so much for your prompt reply. I did not know this was so complex I do like the idea of using batteries and that's how we do in our data center use series of batteries and have our servers powered on even in a disaster. I really wished the companies that make motors with stand high/low voltage so that poor farmers don't have to go through this. Please let me know if you come across anything related to this.
 

Papabravo

Joined Feb 24, 2006
17,316
Thank you so much for your prompt reply. I did not know this was so complex I do like the idea of using batteries and that's how we do in our data center use series of batteries and have our servers powered on even in a disaster. I really wished the companies that make motors with stand high/low voltage so that poor farmers don't have to go through this. Please let me know if you come across anything related to this.
In the early days of electrification in the United States there was a battle between Edison and Westinghouse over the use of DC versus AC. Ultimately AC became the prevailing method of power distribution in the United States and subsequently the rest of the world. One other legacy was that many building operators installed elevators that utilized DC electric motors. The elevators and their motors remained in service for over a century. Con Edison, the power company for New York City, was REQUIRED to provide DC electric power well into the 21st century. If there were pumps that ran on DC power that could provide a beneficial alternative.

https://www.trainorders.com/discussion/read.php?11,1541316
https://cityroom.blogs.nytimes.com/2007/11/14/off-goes-the-power-current-started-by-thomas-edison/

Since you are associated with a data center, I'm going to guess that you know something about inverters. These are devices that use a battery to generate an AC output. the problem is that finding one to generate the power required by a pump might be a challenge. It is also possible to have a gasoline powered generator produce an AC output. I think the cost of gasoline in non-OPEC member states would pose a severe problem for the farmers. To say nothing of the contributions to pollution and global warming. I really have very little clue about things that will and won't work for you and them, so don't draw any conclusions about what I am proposing, except that I am trying to help.

You mention having motors withstanding a low voltage condition. If you could detect that the motor had stalled and shut off the current it might prevent the damage. In the case where the shutoff is activated you don't want to allow the motor to be turned on again if the voltage is just going to immediately collapse. Maybe there is a set of conditions that would trigger a shutoff, but require some period of normal power levels before turning back on again. I can think of complicated ways to do it, but not too many simple ones come to mind. The PLC (Programmable Logic Controller) is an expensive piece of equipment that might be used in a factory to do the function you describe. If you can do it with a PLC, there might be a way to mimic just that function by a cheaper method.
 
Last edited:

crutschow

Joined Mar 14, 2008
28,227
You could perhaps use a circuit like this to control a solid-state relay or contactor to the pump motor.
The circuit may need some added hysteresis so the motor doesn't turn back on for the small rise in line voltage that can occur when the motor load is removed for a low voltage.
 

DickCappels

Joined Aug 21, 2008
8,000
Just add one more somewhat similar circuit to keep the power off when the voltage is too high and you're done (except for the testing and revisions).
 
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