Dr. Shrinivas N. Repak. Enhancing Transformer Reliability : Implementing Lean Six Sigma Tools To Reduce Failure Rate From 0.75% PPM To 0.35% PPM. kuey [Internet]. 2024 May 27 [cited 2025 Sep. 29];30(5):9721-38. Available from: https://kuey.net/index.php/kuey/article/view/4626