Electronic Theses and Dissertation

Sistem baterai arus searah (DC) merupakan salah satu komponen penting di gardu induk yang berfungsi sebagai sumber catu daya cadangan untuk mendukung sistem proteksi, kontrol, dan komunikasi ketika terjadi gangguan pada sumber listrik utama. Keandalan sistem baterai perlu dijaga melalui kegiatan inspeksi dan pemeliharaan secara berkala guna memastikan kontinuitas operasional peralatan di gardu induk. Kegiatan magang ini bertujuan untuk menganalisis kondisi sistem baterai 110 VDC dan 48 VDC di Gardu Induk Banda Aceh melalui pengukuran tegangan tiap sel, evaluasi keseimbangan tegangan antar sel (cell balancing), serta analisis kondisi tegangan total sistem. Metode yang digunakan meliputi observasi lapangan, pengambilan data melalui formulir pemeliharaan standar PT PLN (Persero), dan analisis deskriptif terhadap hasil pengukuran. Hasil analisis menunjukkan bahwa secara umum sistem baterai masih berada dalam kondisi operasional yang baik dan mampu mendukung fungsi sebagai sumber catu daya cadangan. Meskipun demikian, ditemukan indikasi variasi tegangan pada beberapa sel yang memerlukan perhatian melalui pemantauan dan pemeliharaan berkala untuk mencegah penurunan kinerja baterai di masa mendatang. Oleh karena itu, pelaksanaan inspeksi rutin, evaluasi kondisi baterai, dan tindakan pemeliharaan yang tepat sangat diperlukan guna menjaga keandalan sistem kelistrikan di Gardu Induk Banda Aceh.
Kata kunci: Gardu Induk, baterai DC, pemeliharaan, tegangan sel, cell balancing.

Battery systems are essential components in substations, serving as backup power supplies for protection, control, and communication systems during interruptions of the main power source. Maintaining battery reliability through regular inspection and maintenance is crucial to ensure the continuous operation of substation equipment. This internship aimed to analyze the condition of the 110 VDC and 48 VDC battery systems at Banda Aceh Substation by evaluating individual cell voltages, cell voltage balancing, and the overall battery system condition. The study employed field observations, data collection using PT PLN (Persero)'s standard maintenance forms, and descriptive analysis of the measurement results. The analysis indicates that, in general, both battery systems remain in good operating condition and are capable of performing their function as reliable backup power sources. However, minor voltage variations were identified in several battery cells, indicating the need for periodic monitoring and preventive maintenance to avoid future performance degradation. Therefore, routine inspections, battery condition evaluations, and appropriate maintenance practices are essential to maintain the reliability of the electrical system at Banda Aceh Substation. Keywords: Substation, DC battery, maintenance, cell voltage, cell balancing.