Tips for maintaining alternators of diesel generator during daily operation
1. Electrical Safety Checks
1.1 Tightening and inspecting stator winding terminals to avoid phase-to-phase short circuit.
1.2 Monitoring alternator negative sequence ammeter to detect abnormality early and prevent short circuit.
1.3 Preventing short circuits between phases of stator windings through regular patrols.
2. Operational Safety Checks
2.1 Ensuring alternator does not run out of all phases and taking protective measures in case of circuit breaker failure. Activate the circuit breaker failure protection in a timely manner when the main circuit breaker of the alternator-transformer unit is in non-full-phase operation. If the main circuit breaker cannot be disconnected, it is necessary to disconnect all power sources that are connected to the same bus.
2.2 Regularly checking and preventing asynchronous connection of alternator to the grid.
2.3 Preventing local overheating of alternator and addressing overheating malfunction promptly. If the alternator overheats and triggers an alarm, appropriate measures must be taken to reduce the temperature. If necessary, the diesel generator should be stopped to allow it to cool down and eliminate the malfunction.
2.4 Identifying and addressing rotor winding grounding faults to prevent serious malfunction. If it is found that the grounding is stable metal grounding, the diesel generator should be stopped immediately.
3. Excitation System Checks
If the alternator is equipped with a PMG, check and prevent damage caused by excitation system failure.
3.1 Repair and operate the automatic channel of the excitation regulator promptly if it fails.
3.2 Avoid running the alternator under manual excitation regulation for an extended period.
3.3 During manual excitation regulation, adjust the reactive load appropriately while adjusting the active load to prevent the alternator from losing its static stability.
