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#maintenance
2 posts filed under this tag, newest first.
Insulation resistance test values: what passes, and when to reject
What a megger reading means: IS 732 and IEEE 43 limits, temperature correction, polarisation index, and the three things that fake a failure.
13 min read
Why distribution transformers fail: one mechanism, ten routes to it
Almost every failure mode ends as heat or water in the paper. The 6 °C rule that quantifies it, and the oil tests that see it coming months ahead.
8 min read