Discuss Hertz And Volts? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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ahmedahmedahmed

After Greetings

suppose that you have light works on (240 vac and 50 hz) and machine works on (240 vac and 50 hz)

I need to know what will happen for each of (light and machine) if

1- the volts increase
2- the volts decrease
3- the hertz increase
4- the hertz decrease

Thanks

Best regards
Ahmed Hassan
 
The lights will increase/decrease in brightness with voltage increase/decrease. Too much increase and they will blow. Machines will probably operate the same, though with less power and efficiency, whether the voltage increases or decreases. Again, too much fluctuation and they will become damaged. The frequency will be pretty constant - at least, in the UK - not too sure about power transmission systems in Palestine. Please bear in mind that this is a UK based forum and the answers you receive will not necessarily apply to your home country.
 
Reducing the hertz in a motor will reduce the speed.
 
I don't mention the frequency in my country decrease or increase

It's just a question to know

Working in Saudi it's 60hz over here and back in the UK it's 50hz. Most modern equipment will be rated 50/60hz and then the voltage.

If you put a 50hz motor on a 60hz frequency it would run proportinately faster and then burn out eventually. if you put a 60hz motor on a 50hz frequency then it would run slower be less efficiencent and cost more.
 
@Malcolmsanford
Modern motor are wound to be more robust nowadays and wont burn out at 60hz, and alot are designed for such purpose with the popularity of VSC's (inverters), dual voltage motors which are extremely common have both sets of readings stamped on their plates now for running at 50hz and 60hz, ive taken a motor to 90hz with no problems but did check with manufacturer that the motor could handle this.
Its a combination of whether the motor can cool it self sufficiently at the higher speed and whether the windings can cope with the higher voltage as the voltage increases proportionally with the frequency increase, but having said this going too high will effect the torque it can achieve.
 
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