Dear All;
Our GE Gas Turbine frame 5 stopped and ratcheting mechanism was initiated normally, 01 Hours after, we got alarm ratchet trouble due to ratcheting pump not cutting off after time that should be off, other alarm hydraulic ratchet motor overload alarm (L49HR_ALM) initiated from MCC to MARR VIe Control system.
Alarms ratchet trouble (L30HRX-ALM) and hydraulic ratchet motor overload (L49HR_ALM) were persisting for more than 2 Hours and protection relay not breaking the circuit to stop the motor when an electrical overload happen and per consequence burn out the switch in a relay.
After checking electric circuit for ratcheting motor 88 HR, I didn't find any logic to stop the motor when overloading occurred.
My question is, why overload protection for 88HR is not there and on the other motors like 88QA, 88HQ the overload protection is there.
Similar for DC lube oil emergency motor 88QE, no protection in case of overload.
Regards
Our GE Gas Turbine frame 5 stopped and ratcheting mechanism was initiated normally, 01 Hours after, we got alarm ratchet trouble due to ratcheting pump not cutting off after time that should be off, other alarm hydraulic ratchet motor overload alarm (L49HR_ALM) initiated from MCC to MARR VIe Control system.
Alarms ratchet trouble (L30HRX-ALM) and hydraulic ratchet motor overload (L49HR_ALM) were persisting for more than 2 Hours and protection relay not breaking the circuit to stop the motor when an electrical overload happen and per consequence burn out the switch in a relay.
After checking electric circuit for ratcheting motor 88 HR, I didn't find any logic to stop the motor when overloading occurred.
My question is, why overload protection for 88HR is not there and on the other motors like 88QA, 88HQ the overload protection is there.
Similar for DC lube oil emergency motor 88QE, no protection in case of overload.
Regards
Attachments
-
144 KB Views: 19
-
176.8 KB Views: 17
-
126 KB Views: 15