Motor Question - Submersibles

[tom baker]

All the submersible motors I have connected are all Class 10 trip.The majority of motors are class 20 - IE a standard horizontal design B motor. What makes the submersibles be a class 10 trip?

 

[Gregg Harris]

All the submersible motors I have connected are all Class 10 trip.The majority of motors are class 20 - IE a standard horizontal design B motor. What makes the submersibles be a class 10 trip?

Also used in refrigeration compressors, being submerged in liquids the overloads needs to trip faster to protect the windings.The cooling effect of the liquids can mask the actual temperature of the overload and current could increase above 500% if more than ten seconds.

 

[weressl]

All the submersible motors I have connected are all Class 10 trip.The majority of motors are class 20 - IE a standard horizontal design B motor. What makes the submersibles be a class 10 trip?

Long and skinny stator/rotor with comparatively little mass to absorb and dissipate heat in addition to the different than NEMA Design B torque/current characteristics.