ISO 22266-1:2022 PDF Download

ISO 22266-1:2022 is a standard that provides guidelines for evaluating torsional vibration of rotating machinery, specifically steam and gas turbine generator sets, due to electrical excitation. The standard focuses on assessing torsional natural frequencies and component strength of the coupled shaft train, including long elastic rotor blades, under normal operating conditions. The guidelines specifically apply to the torsional responses of the shaft train at grid and twice grid frequencies, which are caused by the electrical network's excitation.

It should be noted that the standard does not provide guidelines for torsional vibration caused by other excitation mechanisms, such as steam excitation, that are unrelated to the electrical network. If the shaft cross sections and couplings do not meet the required strength criteria or if the torsional natural frequencies do not conform to defined frequency margins, alternative actions must be defined to address the problem.

The standard applies to both steam turbine generator sets and gas turbine generator sets that are connected to the electrical network. The document also describes the currently available methods for carrying out analytical assessments and test validations of the shaft train's torsional natural frequencies.

It is important to note that radial, lateral, and axial vibrations of steam and gas turbine generator sets are addressed in ISO 20816-2 and are not covered by ISO 22266-1:2022.