What is the purpose of using series capacitor in a transmission line? January 23, 2018 by DWQA Questions › Category: Transmission and Distribution › What is the purpose of using series capacitor in a transmission line? 0 Vote Up Vote Down admin Staff asked 5 years ago 2 Answers 0 Vote Up Vote Down admin Staff answered 5 years ago Answer: The purpose of using series capacitor in transmission line is to compensate voltage drop. 0 Vote Up Vote Down admin Staff answered 5 years ago Answer: to compensate voltage drop.