<![CDATA[The substation battery serves as an emergency power source during interruptions of the Alternating Current (AC) supply to the rectifier, thereby maintaining the uninterrupted operation of protection and control equipment. Considering the critical role of batteries in maintaining substation system reliability, routine diagnostic testing is required to evaluate their suitability as Direct Current (DC) power sources. This study investigates the performance and reliability of 110 VDC protection batteries installed in a high-voltage substation through comprehensive diagnostic evaluations. The diagnostic procedures applied include terminal voltage measurement, electrolyte density measurement, and battery capacity testing, which are commonly used methods to assess battery condition in substation applications. Battery efficiency and estimated discharge time while supplying protection loads were selected as the primary performance indicators for evaluating battery suitability as a DC backup source. The test results indicate that battery 1 achieved an efficiency of 36.74%, while battery 2 exhibited an efficiency of 35.08%. Furthermore, the estimated discharge duration for both batteries was approximately 53 minutes when supplying the protection load. These values are significantly below the recommended operational standards, which require a minimum efficiency of 60% and a discharge duration of at least 3 hours. Based on these findings, the batteries are classified as unreliable and unsuitable for sustained DC supply during blackout conditions. The results highlight the importance of periodic battery diagnostics and timely maintenance to ensure reliable DC power systems in substations.]]>
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