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Supply Voltage and Frequency

Electrical Requirement Considerations.

Supply Voltage and Frequency

Voltage is defined in basic electric principles (Physics: Mr. Voltaire)
as the potential difference that pushes a current in Amperes through
a Resistance in Ohms. This Voltage can be a steady value or a repetitive 
waveform (square wave, sinewave, triangular etc)

  • Unit of the voltage is Volt (V). 

Frequency is the number of cycles that a voltage waveform
repeats itself per seconds.

  • Unit of the Frequency is Hertz (Hz).

DC voltage is a voltage with 0 frequency in effect is steady at a  certain value.

AC voltage is the process in one cycle a voltage will change from 0  volts to a maximum positive value then back to 0 and over to the  same maximum but negatively then back to 0.

  • For example: 230V AC 50 Hz, means that the voltage waveform does the above cycle fifty time per second and swings between positive 230Volts and negative 230Volts.

The effective from incorrect voltage.

  • If motors are operated with a different voltage than specified, it can damage the motor and connected devices.

The effective from same voltage but incorrect frequency:

  • Case 1: You have 60Hz power for a 50Hz motor, the motor will run 20% faster and the motor output power will increase, a 10kW 50 Hz motor will be a 12kW motor on 60 Hz power supply then the motor current and winding  temperature will also increase, it will be overload.
  • Case 2: You have 50Hz power for a 60Hz motor, the motor will run 20% slower on 50Hz power supply This also results in 20% less power machine performance will also decrease.

Click Image to enlarge

 

 



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