The reliability of distribution transformers plays a crucial role in maintaining the continuity of electrical energy distribution. This study aims to analyze the reliability level of the PR012 distribution substation at PT PLN ULP Praya through temperature measurements using the thermovision method. Measurements were conducted using a FLIR T400 thermal camera on several transformer components, including the transformer body, transformer top packing, TM bushing, TR bushing, rack handle, fuse, and cable. The measurement results showed the highest temperature was 50.5°C in the transformer body, while the lowest temperature was 44°C in the rack handle. All components remained below the normal operating temperature limits according to the IEC 60076 and IEEE C57.91 standards. However, a temperature difference was found at the fuse, indicating a load imbalance. Based on the analysis, the PR012 distribution transformer at PT PLN ULP Praya still has a good level of reliability, but regular load equalization is required to maintain the transformer's performance and operational life.