The reconstruction of the 110 kV transmission line “Podgorica-Danilovgrad-Perućica” represents a new investment in the power grid. This 110 kV transmission line has been in operation since 1959. In 1982, the 110 kV transmission line “Perućica-Podgorica” was connected to the 110/35 kV substation “Danilovgrad” using an input-output system, resulting in two transmission lines: “Perućica-Danilovgrad,” 17.1 km long, and “Podgorica-Danilovgrad,” 17.6 km long. During operation, three significant failures occurred due to severe weather conditions (storm winds): in 1962, four towers were broken; in 1974, seven towers were broken; and in 2019, one tower was broken. During operation, issues with conductor damage caused by problems with suspension clamps were observed. Additionally, analyses showed that it is necessary to increase the transmission line’s capacity, especially due to the winter operation regime of the “Perućica” hydropower plant and the potential outage of neighboring transmission lines. Considering other development plans, such as the “Gvozd” wind farm and the increase in production capacity at the “Perućica” hydropower plant, the reconstruction of the transmission line is planned, raising its transmission capacity to a nominal current of 630 A.
Within this project, high-temperature low-sag (HTLS) conductor was used/installed for the first time, which, in terms of dimensions, corresponds to the existing AI/Fe 150/25 mm² conductor. This approach increases transmission capacity while using the existing tower structures, which is a key advantage of this solution. The use of this conductor does not affect the tower statics, as the forces on the towers caused by installing the new conductor are not greater than those generated by the existing conductor.
On the entire 110 kV transmission line “Perućica-Danilovgrad-Podgorica 1,” the existing conductor and equipment have been replaced. As part of this investment, remaining works include the replacement of the shield wire, anti-corrosion protection of the towers, and additional grounding measures, for which the technical specifications are being prepared in order to launch the tender procedure.
The value of the investment is €3 million, and the planned completion date is 2026.