Is it ok to use 1.5 square copper wire150m for 3 kW motor?

Absolutely; Because the load current is 3 kW (220V voltage is12a; The voltage of 380V is 10A), and the voltage drop of 1.5 square copper conductor at 150m is only 1.2V, so it can be used completely.

But it must be remembered that the 150 rice wire cannot be wound, let alone looped, or wound on other metals (such as iron) including metal insulators (such as one-legged porcelain bottles).