Under what circumstances should a turbine undergo an overspeed test?
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1. After a major overhaul of the unit; 2. After disassembly and maintenance of the emergency safety device; 3. When the unit is operating normally but the emergency safety device malfunctions; 4. After the unit has been shut down for one month and then restarted; 5. Before a load-shedding test; 6. When it is not possible to perform the oiling test on the emergency safety device after the unit has operated for 2000 hours, or when the oiling test fails.
It is not possible to conduct an overspeed test while driving normally; the overspeed test is primarily used to check whether the mechanical and electrical shutdown mechanisms (overspeed interlocks) of the equipment function properly, and it is carried out when testing the equipment individually. Things that need to be done during the first test run of the equipment ； Actions required after maintenance ； It needs to be done when resuming operation after long-term parking.
This was an exam question for our company this year. .