Harmonic is often existed in the transportation system because there are lots of harmonic maker as capacitor ,transformer etc , harmonic is the main reason to reduce the power and efficiency, meanwhile increasing risk of accident .vehicles also equipped with active power filter GreenSine. As far from operation of Turkey's capital Ankara Metro Line. It makes the whole system stable.
![土耳其首都安卡拉地铁三号线]( "土耳其首都安卡拉地铁三号线")