<![CDATA[The reliability of the power distribution network in the tropics is particularly vulnerable to thunderstorm disturbances, which can cause asset damage and service interruptions. Lightning arrester (LA) as a primary protection component experiences performance degradation over time due to environmental factors, which has the potential to cause protection failure to thermal runaway. This study aims to conduct a technical analysis of the urgency of replacing existing LA units through a quantitative evaluation of isolation prisoners and a comparison of technical specifications with modern LA. The research methodology refers to the standard testing of insulation resistance with high DC voltage (2.5 kV - 5 kV), where values below the critical threshold of 1 Giga Ohm (GΩ) are identified as indicators of insulation failure after corrective cleaning measures are ruled out. The researchers analyzed that the value below the standard indicated a significant risk of leakage current that could trigger catastrophic failure of the Metal Oxide Varistor (MOV) block. The results of this analysis are expected to provide a strong technical justification for predictive maintenance policies, in order to improve surge protection capabilities, reduce the rate of disturbances, and ultimately strengthen the reliability of the electrical system comprehensively.]]>
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