Root Cause Analysis (RCA): Transformers Coolers Weld Joints Oil Oozes Were Eye Sores.
Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of one or two decades ago. These articles will help you to improve your troubleshooting skills and knowledge.
All transformers come with thin-walled tubes oil coolers. All transformers, oil coolers’ welded joints ooze and dust accumulation there were eye sores.
They attracted inspecting government electrical inspectors’ adverse comments during the previous 5 years’ annual inspections.
Obviously, the RC is factory-done manifolds to elliptical tubes poor welds (above figure). The M-seal application did not stop leaks, as it sticks to clean surfaces only.
Site repairs involve transformer draining, storing the oil in clean drums, weld the leaks, oil refill, and hot re-circulation – all tedious and error-prone tasks.
In addition, even factory welds ooze! Hence, plant or local repair shops welders used to thick metal welding can do no better.
The author mulled over this for several weeks and hit on the following repair tech:
The trial first three transformers never oozed again rain or shine the first year! The encouraged crew stopped all transformers’ the oil leaks, this way. Visiting electrical inspectors adverse comments vanished.
Author: S. Raghava Chari
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