Analisis Keandalan Sistem Distribusi 20 kV Penyulang Solo di PT PLN (PERSERO) ULP Bengkalis Menggunakan SAIDI

This study analyzes the reliability of the 20kV distribution system on the Solo Feeder at PT PLN (Persero) ULP Bengkalis using the System Average Interruption Duration Index (SAIDI) indicator. The data used includes the number of outages, outage durations, and the number of affected customers during the period of February–June 2025. The SAIDI value was calculated for each month and compared with the SPLN 68-2:1986 standard, which sets a maximum limit of 105 minutes/customer/month. The results show that the SAIDI values ranged from 2 to 102 minutes/customer, all of which were below the standard limit, indicating that the distribution system is reliable. Nevertheless, reducing outage durations and implementing preventive maintenance, such as tree trimming and optimization of protection systems, are recommended to further improve service quality.