The purpose of this recommended practice is to: a) Describe all methods available for online monitoring of large synchronous generators included within the scope of this document. b) Describe mechanisms of degradation and applicable monitoring devices. c) Recommend which of the online monitoring techniques described in this document ought to be adopted, based on machine type. d) Recommend monitored threshold values for initiating remedial or compensating actions, when widely agreed industry practice exists.This document describes the recommended practice for online monitoring of large synchronous generators with ratings of 10 MVA and above. The scope includes generators with salient-pole rotors, as well as generators with cylindrical rotors. The document also provides basic information on the various online monitoring techniques described, as well as recommended threshold values for initiating a remedial or compensating action, whenever those values are typical within the power generation industry. This document does not cover those instruments that are clearly associated with the protection scheme of the generator, such as volts/hertz, out-of-step, over/under frequency, and so forth.
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