Possible reasons for failure of solid state electronic relay
I got following question from one of the senior executive of power generation company. I'm pasting the text from email :-
It is observed that solid state electronic relay provided in protection of generator FSSS (Furnace Supervisory Safeguard System) of boiler and turbine fail in thermal power station, in spite of maintaining desired temperature of 23[sup]o[/sup]C, proper fitting, cleanliness and voltage regulation.
What could be the possible reasons for failure of these relays?