Electrical engineering root cause analysis (RCA) related to Arc Fault Breaker (AFB) and its problem solved.
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.
Shock Pulse Meter (SPM) readings entering the yellow zone within 6 months and the red zone within a month from then required too often bearing changes and resulted in production loss and heavy maintenance expenses.
The electrical and even most mechanical crew accepted it as a way of life attributing spurious bearings prevalence, though the company bought bearings from manufacturer authorized outlets only.
The author carefully studied Arc Fault Breaker (AFB) catalogs to refresh his AFB know-how.
The following appealed to him:
The author read these lines from the catalogs and urged the group to do their best to realize similar Arc Fault Breaker (AFB) lives.
He pointed out several never dissembled six years servicing equipment AFBs good SPM readings. However, the group seemed still skeptical.
The author observed bearing replacements and noted the following:
The above 3 factors opened the Author’s eyes! He checked with the shop engineer and found that machinists machine shafts dia for 80 to 100 microns interference fit AFBs/CHs!
Obviously, this is far higher than the AFB catalogs specified transition fit by machining the shaft for m6 tolerance. This works out for a thumb rule figure of 1/7 micron / mm shaft dia clearance or interference for the common 25 to 150 mm bore AFBs / coupling halves.
The author read these to the crew and urged fitting Arc Fault Breaker (AFBs) and CH accordingly.
He instructed further the following to realize the objectives:
The realized benefits are;
Author: S. Raghava Chari
Do you face any similar issues? Share with us through the below comments section.
If you liked this article, then please subscribe to our YouTube Channel for Instrumentation, Electrical, PLC, and SCADA video tutorials.
You can also follow us on Facebook and Twitter to receive daily updates.
Read Next:
Rotating equipment packages such as pumps, compressors, turbines need the lube oil consoles for their…
This article explains how to blink lights in ladder logic with a detailed explanation video…
In this article, a simple example will teach you the conversion from Boolean algebra to…
In this article, you will learn the PLC cooking timer example for kitchen automation using…
Learn an example PLC program to control a pump based on level sensors using ladder…
In the PLC timer application for security camera recording, when motion is detected then camera…