CSA C391:25

Preface This is the second edition of CSA C391, T esting of three-phase synchronous machines during refurbishment. It supersedes the previous edition published in 2015. CSA acknowledges that the development of this Standard was made possible, in part, by the financial support of BC Hydro, Efficiency Manitoba, Hydro-Québec, Natural Resources Canada, and Northwest Energy Efficiency Alliance. This Standard was prepared by the Subcommittee on Test Method for Refurbishment of Synchronous Machines, under the jurisdiction of the Technical Committee on Energy Efficiency of Industrial Equipment and the Strategic Steering Committee on Performance, Energy Efficiency, and Renewables, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 Inclusions This Standard covers three-phase, alternating current, salient pole synchronous machines 150 kW and up, 200 V to 13 800 V, at rated machine frequencies, and can assist in verifying the machine efficiency has been maintained. Note: This Standard can be useful and applied with discretion to products outside the scope of this Standard. 1.2 Exclusions Large 2-pole and 4-pole solid cylindrical rotor machines, typically used as generators for utility and large industrial applications, are excluded from this Standard. Note: See Annex D.2 for information about synchronous generators. 1.3 Terminology In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 1.4 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. All current and voltage quantities are root-mean-square (RMS) values. All formulas and measured quantities in this Standard conform to the following units unless otherwise noted: a) voltage — volts, V; b) current — amperes, A; c) power — kilowatts, kW; d) frequency — hertz, Hz; e) torque — newton-metres, N∙m; f) speed — revolutions per minute, RPM; g) temperature — degrees Celsius, °C; h) time — seconds, s; and i) resistance — ohms, Ω.