The electricity distribution breakdown can be caused the service life and operating frequency of Oil Dielectric Strength (ODS). Hence, it requires a study due to the spare part is difficult to find. This paper aims to test the ODS on Oil Circuit Breaker (OCB) of 13.8 kV aged between 29 to 43 years. The test used the ASTM D1816 standard to analyze the effect of oil life and circuit breaker operating frequency on the physical, color and strength of ODS. For the visual test used the ASTM D1524 standard. The color test based on the ASTM D1500 standard. From the test results, it can be seen that 6DN F1 was yellow-black in colors. The color level was from 0.5 to 6, which was a striking color difference. This happens because it had been operating for 3 years with a frequency of 2 manual open times and 11 trips with a large normal load of 206A. In the 8D F7 feeder, there was also a decrease in breakdown voltage, which was far from 45.6 kV to 9.7 kV. Therefore, the oil was declared failed due to below the minimum standard of 27 kV. Based the validity test, the six samples were still within the allowable limits based on ASTM D1816 with the range value being below 92%. This means that the six samples were valid.
Biodiesel merupakan bahan bakar alternatif pengganti solar yang berasal dari bahan nabati seperti minyak goreng bekas. Minyak goreng bekas adalah limbah dari sisa penggorengan, biasanya dibuang karena sudah digunakan lebih dari satu kali. Transesterifikasi merupakan reaksi antara trigliserida yang terkandung dalam minyak nabati atau lemak hewan dengan alkohol untuk membentuk alkil ester. Penelitian ini bertujuan untuk menganalisis sifat fisika dan nilai keekonomian minyak goreng bekas menjadi biodiesel dengan metode transesterifikasi. Bahan limbah yang digunakan merupakan minyak goreng. Analisis fisika dilakukan dengan melakukan pengujian karakteristik biodiesel meliputi % FFA, angka asam, gliserol, kandungan air, massa jenis, pH, rendemen dan warna. Nilai karakteristik biodisel pada sampel 1 yaitu: FFA sebesar 0,65 %, angka asam 0,42 mg, gliserol 59 mL, kadar air 0,006 %, rendemen 0,83 %, massa jenis 852 kg/m3, pH 7 dan menghasilkan warna kuning emas, sedangkan nilai karakteristik biodisel pada sampel 2 yaitu: FFA sebesar 0,56 %, angka asam 0,50 mg, gliserol 58 mL, kadar air 0 %, rendemen 0,83 %, massa jenis 845 kg/m3, pH 7 dan menghasilkan warna kuning emas. Nilai karakteristik biodisel pada sampel 3 yaitu: FFA sebesar 0,65 %, angka asam 0,50 mg, gliserol 59 mL, kadar air 0,07 %, rendemen 0,78 %, massa jenis 847 kg/m3, pH 7 dan menghasilkan warna kuning emas. Pengolahan minyak goreng bekas sebanyak 300 L/bulan akan menghasilkan biodiesel 246 L/bulan @Rp. 9.000 = Rp. 2.214.000 dan gliserol 23 L/bulan @Rp. 3.000 = Rp. 86.250. Sehingga diperoleh total pendapatan = Rp.2.300.250/bulan. Sementara itu, biaya produksi berupa penggunaan listrik, pembelian pelarut dan katalis sebesar Rp.1.370.500/bulan. Sehingga Hasil analisis keekonomian menunjukkan bahwa pembuatan biodiesel skala industri kecil layak diproduksi dengan nilai keuntungan mencapai Rp.929.750/bulan.
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