In this article, the investigation of the power supply system's reliability in our Republic, particularly focusing on the cable lines utilized in rural power networks, is highlighted as a pressing concern within the energy sector today. A crucial task in addressing this issue successfully involves researching the reliability metrics of existing cable lines, specifically self-contained insulated conductors in rural power networks with dynamic variable loads, and formulating pertinent recommendations. The reliability indicators of cable lines in rural areas were assessed using a comprehensive method that integrates modern approaches and the latest advancements in science and technology. The method's superiority over others is grounded in scientific principles. Furthermore, factors influencing the reliability metrics of cable lines in rural power networks, such as cable line failures, are systematically categorized.