IEEE P2943

New IEEE Standard - Active - Draft.
Adjustable Speed drive (ASD) systems are ubiquitous in the electrical industry. Many manufacturers often compete for their share in this ever-increasing market. Lately, customers are becoming savvy and are eager to compare system efficiency and energy usage associated with various motor-drive systems to help them decide on an optimal motor-drive configuration for their applications. The aim of this recommended practice is to provide the industry with a universal method to assess the energy efficiency of motor and drive systems operating at varying load points, including operation beyond base speed and regenerative mode. Auxiliary components, different motor drive configurations, including multi-drive systems fed from a single power source are included in this recommendation. This standard offers an all-encompassing approach to system-wide energy efficiency evaluation. The methodology adopted here is based on energy measurements rather than power to help avoid snapshot results of system efficiency. This Recommendation is prepared by the subcommittee on Standards, under the jurisdiction of the Industrial Drives Committee (IDC) of the IEEE Industry Applications Society (IAS).

This recommended practice establishes a testing method for determining energy efficiency of a motor drive system operating at varying load conditions. It covers motor drives with rated system voltage up to 690 Vac (line-to-line rms) or 1100 Vdc. The test methodology covers both single motor, single drive systems, as well as multiple drives fed from a common AC to DC rectifier or a DC source. The test methodology covers all three-phase and multi-phase AC motors operated on variable speed drives and does not place restrictions on the type of variable speed drive used in the system under test. Single phase input fed three-phase motor drive systems are also covered in this recommended practice.