Turbocharger overspeed protection test.
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I have a question: in the ITCC, the turbine has an overspeed protection test mode. During operation, does it actually cause the turbine to exceed the overspeed protection limits, thereby triggering the overspeed protection shutdown interlock?
Yes, and when you jump quickly, you need to pay attention to the speed – see at what speed you’re jumping. It’s enough to do it once; some people don’t do it at all
Can’t the overspeed protection value be set within an allowable speed range to see if normal interlocked shutdown can be achieved? It’s fine; just adjust the value back to its original level. Or the instrument can send a signal directly when it’s time to shut down the machine after testing
Generally, it’s the instruments that send a signal; there are no tests done, and even a slight overspeed can still cause damage to the machine
The overspeed protection in ITCC is electronic; domestic steam turbines generally also have mechanical overspeed protection, and the setting for mechanical overspeed protection is higher than that for electronic overspeed protection. We first conduct tests by increasing the speed to the value set by the electronic protection system, and then remove this electronic protection to measure the actual value of the mechanical overspeed protection. The actual value obtained from mechanical overspeed protection usually differs from the design value. Next is the recording of the idling time, which is divided into the idling time during a single test and the idling time after the turbine is connected to a compressor.
Check whether there is a mechanical overspeed protection mechanism; if such a mechanism is present, an overspeed protection test must be conducted before startup, that is, by allowing the speed to exceed the set protection value.
This is a real rotation. I’ve been worried all the time, afraid it might fly away. There are electronic and mechanical ones. And then there’s keeping records