<![CDATA[The upgrading of oil and gas production facilities requires an electrical power distribution system that is reliable, safe, and compliant with voltage quality limits. This article discusses power cable sizing and voltage drop evaluation for the Puspa Asri Gathering Station Phase 2 Upgrading Project in Jambi, based on engineering documents for calculating cable sizing and voltage drop in the Puspa Asri Phase 2 Collector Station Upgrading Project. The method includes load identification, full-load current calculation, determination of cable current-carrying capacity after temperature and grouping correction factors, verification of voltage drop under steady-state and motor-starting conditions, and assessment of thermal withstand capability under short-circuit conditions. The design criteria refer to IEC 60364-5-52 and related standards, with voltage drop limits of 2% for switchgear/MCC-to-switchgear/MCC routes, 5% for motor terminals under normal operating conditions, 15% during motor starting, and 3% for distribution panel feeders. The evaluation of 16 main cable routes shows that all selected cables satisfy the requirements for ampacity, voltage drop, and short-circuit withstand capability. The selected cable sizes range from 3C+E 4 mm² to 4C+E 95 mm², using a temperature correction factor of 0.91 and a grouping derating factor of 0.79 for aboveground installation. The Water Injection Pump C case study shows that the selected 4C+E 35 mm² cable has a corrected current-carrying capacity of 90.58 A, which is greater than the design current of 47.03 A, with a steady-state voltage drop of 1.33% and a motor-starting voltage drop of 3.95%. Therefore, the cable design is considered technically feasible to support reliable operation of the production facility.]]>
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