A problem in LV room switchgear panel. The scenario was such that:
The ACB compartment showed that it has been exposed to severe heat caused damage. Furthermore the Current transformer connected on red phase bus bar had sustained severe damage compared to the blue and yellow phases.
The ACB did not sustained any physical damage. However, from rear view it can be noted that yellow phase copper conductor had melted due to arching activity. The red and blue phases are partially melted.
The damage to the transfer switch had showed severely at upper section compared to lower section. The conductor had partially melted due to high current from the incident.
Details with images can be found in attachment
Please explain why did this happened?
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