550V AC Motor protection 1

[Electrical4life]

We have been losing motors lately due to wet insulation from high jet water ( our plant operates in very wet environment). I have installed earth leakage relays (CBCT) of 250mA but relay only operates after motor damage. Whay is the best electrical protection for this application?

 

[panter]

maybe indicator of moisture in the terminal box should give early information on moisture penetration and possible motor failure .
But higher IP rated motor or good ventilation would be a more efficient solution .
Good luck

 

[ag2508]

Would it be possible to convert motors distribution network into an insulated earth or high resistance earth network? Insulation monitor can detect low resistance on any phase before it develops into a fault.