I have temperature sensors embedded in the stator windings of my motors. Can the 3 phase voltage monitor provide extra protection?
A – The answer is yes; let me explain how: A. The 3 phase voltage monitor provides fast disconnection of the motor windings when voltage faults occur. Over-temperature sensors will not disconnect the motor until the winding is in an overheated condition. Insulation damage will have already occurred near hot spots found within the windings. B. The 3 phase voltage monitor protects both the stator and rotor windings from voltage faults. Winding temperature sensors protect only the stator windings. C. Over-temperature protectors cannot provide protection against: Phase reversal Over-temperature protectors may not provide adequate protection to prevent insulation deterioration caused by: Moderately unbalanced voltages Phase Loss (single phasing) Low or high voltages Since insulation deterioration is permanent and cumulative, elevated winding temperature should be avoided. Disconnection of the motor windings can help prevent premature failure. D. Both the over-temperature sensors and the 3 p
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