The unified power flow controller (UPFC) controls all electrical parameters affecting power transmission, enhancing grid flexibility. It conserves transmission corridors and provides flexible power flow control, dynamic compensation, and stability improvements. A conventional UPFC comprises two back-to-back voltage-source power electronic converters and several transformers. The bulky transformers significantly increase the device’s size and maintenance costs, thereby limiting its widespread application. To compensate the limitations, a multiport transformer-less unified power flow controller (MTUPFC) topology was proposed, offering multiple benefits such as low cost, lightweight, rapid dynamic response, and easy port expansion. However, when a line short-circuit occurs, the remaining healthy lines can easily be affected by the fault current, posing a threat to the safety of both the MTUPFC device and the lines. In this paper, we present a restoration scheme for MTUPFC-equipped grid systems after a failure occurs. Through this scheme, the faulty line is reliably isolated, while the healthy lines continue to operate. The configuration and implementation of this scheme are discussed. The proposed scheme is proven to be effective based on simulation results.