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Which one is better between Line Choke & DC choke when used with Altivar 71 drive.

Choice depends on the environment; dc choke is very good on harmonics H5 and H7. 
AC choke very good on harmonics > = H9 
But both ac and dc choke, it is used to reduce harmonic distortion of the current produced by the drive. 
A line choke can be used to provide improved protection against overvoltage on the line supply.
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