1. The current taken from the line when a rotor is at
a standstill at rated voltage and frequency.
It is the line current when starting the motor direct
2. Current drawn by the motor when the motor locked (stopped) but full voltage is applied to the motor terminal.
Starting Current
Current drawn by the motor at the time of motor starting period.
In DOL starting, the full voltage is applied on motor terminal with the rotor stopped.
For the first few seconds, the rotor is almost stopped and it is similar to the case of locked rotor condition, so the starting current drawn by the motor is the same as the locked rotor current.
In other starting method, star delta/soft start, lower voltage is applied to the motor terminal hence the starting current is less than the locked rotor current.
In other words, they are more or less the same value, but starting current only occurs during start up. Locked rotor current occurs at any time the power is applied and the motor cannot spin, i.e a load jammed.
*will update later
Source:
http://cr4.globalspec.com/thread/43929/Locked-Rotor-Current-vs-Starting-Current
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