Generator Protection

DO YOU MEAN THE CURRENT PROTECTION FOR OVER TORQUE LIMIT> THIS HELPS TO PREVENT THE OVER TORQUE ON THE GEN> SHAFT. Current out put limit 4 - 6 * I rated.

Shaft of the generated is mechanically protected. As torque generated is limited to its capacity. AVR has this feature.

Thanks for your reply. But I am sure it is not related to TORQUE. The SHAFT CURRENT PROTECTION (51SC) is related to Generator Shaft earth fault current.

Please checkup and reply

Dear Friend

Shaft of generator is also conductor. It cuts the magnatic field of stator/ rotor of generator . So voltage induced in the shaft causes current. This current is injurious to babbit material of Bearings provided for Turbo Generators. . Normally one end of the shaft is grounded through a carbon brush. Shaft current monitors are available in market. Vendors of these equipment will give you more details if you search in WEB.

Thats all i know about shaft current in Generators

Bhushan