b Over heating of main contact path

B) Over heating of main contact path

1) Reason: Foreign matter on the magnet pole faces or jamming of contact carrier preventing contact closing

Remedy: –Remove the foreign matter

2) Reason: Improper termination of cables, improper cross section of cable & busbar

Remedy: Check the millivolt drop across cable/strands & terminals
The mV drop should be < 4.0 mV at rated currents otherwise clean busbar or recrimp cable
.
3) Reason: Presence of harmonics

Remedy: Suitable derating to be employed.

4) Reason: Improper ventilation of panel
Remedy: Provide suitable cooling for the panels.

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