Electrical energy is fundamental need for humans. Along with the development of technology
and economic growth, the need for electrical energy is also increasing. In East Kalimantan,
sales of electrical energy from 2011-2020 grew 7.1% per year. Electrical energy is
generated by power plants which are usually far from settlements. Therefore, electrical
energy is transmitted by high-voltage or extra-high-voltage transmission lines. In East
Kalimantan, one of them is the transmisson 150 kV Harapan Baru Bukuan, still using 1
xACSR 240/40 mm2 conductor, this line is capable of transmitting 164 MVA of electrical
energy with N-1 reliability. The line is flanked by the SUTT line which already uses 2xACSR
240/40 mm2 conductors, so that with the increasing demand for industrial and household
electricity, the capacity of the line needs to be increased to avoid distribution bottlenecks.
One alternative to increase capacity is to replace the ACSR 240/20 mm2 conductor with
AC3 Lisbon 310 conductor which has 2 times the capacity. This thesis will analyze the
sagging, losses and efficiency of AC3 Lisbon 310. From the calculation results it is found
that the sagging of AC3 is still lower than ACSR240/40 mm2. AC3 losses were 0.734 MW
and ACSR 0.982 MW. Distribution efficiency of AC3 is 99.272% and ACSR is 99.027%.