Pada tugas akhir ini akan dilakukan studi analisis keandalan distribusi 20 kV pada penyulang Pancing dan penyulang Jujur di PT.PLN (Persero) Area Menteng dengan menggunakan metode RIA (Reliability Index Assessment). Perhitungan indeks keandalan dengan metode RIA (Reliability Index Assessment) pada penyulang Pancing dan penyulang Jujur. Perhitungan pada penyulang Pancing pada kondisi perfect switching berupa indeks SAIFI = 0.3373 kali/tahun, SAIDI = 0.3739 jam/tahun, dan CAIDI = 1.1083 jam/tahun, pada kondisi imperfect switching berupa indeks SAIFI = 0.4264 kali/tahun, SAIDI = 0.4663 jam/tahun, dan CAIDI = 2.7327 jam/tahun. Kemudian perhitungan pada penyulang Jujur pada kondisi perfect switching berupa indeks SAIFI = 0.5845 kali/tahun, SAIDI = 0.4297 jam/tahun, dan CAIDI = 0.735 jam/tahun, pada kondisi imperfect switching berupa indeks SAIFI = 0.6825 kali/tahun, SAIDI = 0.5108 jam/tahun, dan CAIDI = 0.7811 jam/tahun.

In this final project will be analyzed the reliability analysis of distribution 20 kV on the Fishing and Repeater Distributors Honest in PT.PLN (Persero) Area Menteng by using RIA (Reliability Index Assessment) method. Calculation of reliability index by RIA (Reliability Index Assessment) method on Fishing Rod and Honest repeaters. The calculation of the fishing line in the perfect switching condition is SAIFI index = 0.3373 / year, SAIDI = 0.3739 hours / year, and CAIDI = 1.1083 hours / year, in the imperfect switching condition SAIFI = 0.4264 / year, SAIDI = 0.4663 hours / Year, and CAIDI = 2.7327 hours / year. Then the calculation on the perfect buffer in perfect switching conditions in the form of SAIFI index = 0.5845 times / year, SAIDI = 0.4297 hours / year, and CAIDI = 0.735 hours / year, on imperfect switching conditions SAIFI = 0.6825 / year, SAIDI = 0.5108 hours / Year, and CAIDI = 0.7811 hours / year