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What is NPS ( Negative Phase Sequence ) protection in Alternator ?

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Question ajoutée par Himadri Roy , MANAGER ELECTRICAL , STEAG ENERGY SERVICES
Date de publication: 2015/10/18
Shujaat Ali Khan
par Shujaat Ali Khan , electrical instructor , GTVC

normally we are having abc sequence in alternator if we connect the system wrongly we will get acb or cba etc sequence which is a negative phase sequence. so the current flow will be affected due to phase difference and there will be overheating.

 

Walid El-Hawary
par Walid El-Hawary , Chief engineer , National Marine Dredging Company

it happen because earth fault and it causes extra heating to the rotor

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