Electrical engineering root cause analysis (RCA) related to aluminum cable terminations repeat failures.
Article Type: | Root Cause Analysis (RCA) |
Category: | Electrical |
Equipment Type: | Bus ducts, Switchgear, Transformers, |
Author: | S. Raghava Chari |
Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of two or three decades ago. These articles will help you to improve your troubleshooting skills and knowledge.
Many failed Aluminum (Al) cable conductor’s terminations particularly at electric motors during the seventies because of technology infancy posed pain in the neck problems to electrical crew and reduced production.
Why problems with aluminum conductor terminations?
The motors’ copper cable terminal boxes were too small for the much larger aluminum cables. Hence, the field crew substituted homemade sheet steel with larger terminal blocks (TBs).
Unfortunately, these were not as water and dust-tight as the originals. High contact resistance terminations because of easily entered water vapors and pollutants corrosion worsened the knowhow lack done aluminum (Al) conductors terminations’ already high contact resistances.
Consequent, hot terminals, charred insulation, and phase to phase and or phase to earth shorts, long motors restoration times reduced production and increased maintenance costs.
The authors below given RCA solution steps eliminated the problems forever:
Author: S. Raghava Chari
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