What is the difference between starting and running current?

 Starting current vs. Running current

Starting current and running current react significantly differently to fluctuations in supply voltage. A decrease in line voltage causes a lower beginning current and a higher running current. A 5% increase in line voltage will enhance starting current while slightly decreasing running current. If the line voltage rises by more than 5%, the starting and running currents will rise as well.

   


Starting and running current are the two most essential parameters in determining the rating of an AC induction motor. In electrical engineering, starting current, abbreviated as Istart, is a measure or rating of how much current is necessary to start a single or three-phase AC motor. It is usually four times the flow rate. Similarly, running current, often known as Irun, is the current required for an AC induction motor to run freely with no load after it has been started. Similarly, full-load current, often known as ifull-load, is the current necessary for an AC induction motor to operate at full load or rated power.

Inrush current, also known as beginning current, is the current required to turn on an electrical equipment when it is first turned on. It can be several times the rated current of the motor.


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